DE102018201619B4 - Heat storage device, work device, method for operating a heat storage device and method for operating a work device - Google Patents

Abstract

A heat storage device (100), comprising: a storage device (102) which has a storage volume (104) for receiving storage medium (106) for storing heat; a heat transfer device (108) by means of which heat is transferred from a working medium (109) to the storage medium (106) and vice versa; the heat transfer device (108) having a working volume (110) for receiving the working medium (109), the working volume (110) being arranged at least in sections, in particular at least approximately completely, within the storage device (102) and is in thermal contact with the storage volume (104); wherein the heat storage device (100) further comprises a pressure changing device (112) for changing, in particular for increasing or decreasing, a working medium pressure of the working medium (109) in the working volume (110), characterized that the working volume (110) to increase or decrease the working medium mdrucks can be reduced or increased by means of the pressure changing device (112).

Description

The present invention relates to a heat storage device.

Heat storage devices are for example from the DE 10 2013 222 677 A1 and the US 2012/0297761 A1 known.

Heat pumps are used to use mechanical and / or electrical energy to increase the temperature of an amount of heat that is provided by a low temperature level. An amount of heat given off at a high temperature is in particular a multiple of the mechanical and / or electrical energy used. Heat pumps are therefore enjoying increasing popularity for providing heat and are used on the one hand for heating applications in the personal area and on the other hand for industrial applications.

Very hot steam is often required, particularly in the process industry.

The heat pumps known from the prior art are operated with electrical energy, which is often generated by means of intermittently operated sources, for example by solar power plants, water power plants and / or by wind power plants. In addition, the low temperature level from which energy is extracted by means of the heat pumps is often subject to fluctuations and / or fluctuations.

A comparatively constant supply of a quantity of heat, which is necessary for industrial applications, in particular for the process industry, in particular to generate steam, has therefore not been possible so far.

The present invention is therefore based on the object of providing a heat storage device by means of which, using mechanical and / or electrical energy, it is possible to store and / or release amounts of high-temperature heat.

This object is achieved by a heat storage device with the features of claim 1.

The heat storage device comprises a storage device which has a storage volume for receiving storage medium for storing heat.

The heat storage device further comprises a heat transfer device by means of which heat can be transferred from a working medium to the storage medium and vice versa.

The heat transfer device comprises, in particular, a working volume for receiving the working medium, the working volume preferably being arranged at least in sections, in particular at least approximately completely, within the storage device and being in thermal contact with the storage volume.

The storage device further comprises, in particular, a pressure changing device for changing, in particular for increasing or decreasing, a working medium pressure of the working medium in the working volume.

A storage medium is preferably arranged or can be arranged in the storage volume, for example a latent heat storage medium, in particular a phase change material.

In particular, a working medium can be fed to the working volume. The working medium is preferably water, in particular saturated steam.

Water is preferably used as the working medium, since water is generally ubiquitous, inexpensive and, in particular, non-toxic for humans and therefore comparatively harmless.

The heat storage device preferably comprises a working volume connection for supplying the working medium, in particular for supplying saturated steam, into the working volume and / or for removing the working medium, in particular for removing saturated steam or condensed water, from the working volume.

By means of the working volume connection, working medium, in particular saturated steam, can be fed to the working volume. A working medium pressure can be changed by means of the pressure changing device, in particular increased in such a way that the working medium pressure, in particular a saturated steam pressure, reaches a value at which the saturation temperature of the working medium, in particular the saturated steam, is greater than a temperature of the storage medium arranged in the storage volume. The working medium, in particular the saturated steam, then preferably condenses, with heat being transferred from the working medium to the storage medium.

The working volume is limited in particular by a pipe register arranged in the storage volume. Working medium, in particular saturated steam, can preferably be fed to the pipe register.

If the pressure change device can be operated mechanically and / or electrically, a heat pump function can in particular be provided by means of the pressure change device.

Thus, with the heat storage device using mechanical and / or electrical energy, storage of high-temperature amounts of heat can preferably be made possible.

According to the invention it is provided that the working volume for increasing or decreasing the working medium pressure can be reduced or enlarged by means of the pressure change device.

The working volume can be reduced in particular to a minimum working volume or increased to a maximum working volume by means of the pressure changing device.

It can be favorable if the working volume can be reduced by a displacement volume to a dead volume by means of the pressure change device.

In the context of this description and the appended claims, a dead volume is understood to mean, in particular, a volume beyond which the working volume cannot be reduced.

In one embodiment of the invention it is provided that the displacement volume can be adjusted by means of the pressure changing device.

The displacement volume can preferably be increased or decreased by means of the pressure changing device.

To reduce the working volume to the dead volume, the displacement volume can be increased, in particular to a maximum displacement volume, and / or can be reduced to zero, in particular, to increase the working volume to the maximum working volume.

An increase in the displacement volume leads in particular to a reduction in the working volume and consequently to an increase in the working medium pressure.

A reduction in the displacement volume leads in particular to an increase in the working volume and to a reduction in the working medium pressure.

In one embodiment of the invention, it is provided that the pressure change device comprises a displacement element for reducing or increasing the working volume. The displacement volume can preferably be adjusted, in particular enlarged or reduced, by means of the displacement element.

The displacement element is in particular a piston, in particular a piston that can be displaced in a cylinder.

By shifting the piston in the cylinder, the working volume can preferably be reduced or increased.

The piston is in particular a liquid piston. If the piston is a liquid piston, a meniscus of the liquid piston preferably limits the working volume.

By using a liquid piston, a high degree of tightness, that is to say a particularly good seal, between piston and cylinder, and thus a high working volume pressure, can preferably be achieved.

Thus, in particular, an amount of heat can also be transferred from the working medium to the storage medium at a high temperature.

In one embodiment of the invention it is provided that the pressure change device comprises a wall element which delimits a displacement volume for receiving a displacement liquid, in particular for receiving an at least approximately incompressible displacement liquid.

The wall element divides the working volume, in particular, into a dead volume and, in particular, a maximum displacement volume.

The heat storage device preferably comprises a displacement volume connection for supplying displacement liquid, in particular for supplying water, into the displacement volume and / or for removing displacement liquid, in particular for removing water, from the displacement volume.

The displacement volume connection is preferably also designed to remove saturated steam from the displacement volume.

The wall element is preferably cylindrical, in particular circular cylindrical.

The wall element preferably extends concentrically to a longitudinal axis.

In particular, the wall element has an annular cross section. A cross section of the wall element is in particular a Understood cross section taken perpendicular to the longitudinal axis of the wall element.

Preferably the displacement liquid is water.

It can be favorable if the wall element is arranged at least in some areas at a distance from the storage volume. The working volume is in particular limited by the wall element at least in sections or at least in regions.

The wall element preferably has a thermal conductivity λ of at most 10 W / m.K.

If the wall element is arranged at least in sections or at least in some areas at a distance from the storage volume and has a thermal conductivity of at most 10 W / m · K, it can preferably be achieved that the displacement fluid and the working medium are at least approximately thermally decoupled and / or insulated by means of the wall element. It can thus be achieved that as little thermal energy as possible is transferred to the displacement liquid, preferably essentially only in a contact area of the displacement liquid and the working medium, i.e. in particular in a contact area of the liquid piston, in particular the liquid piston made of liquid water and saturated steam.

By evaporation of the displacement liquid, in particular by evaporation of liquid water, in the contact area of the displacement liquid with the working medium, in particular with saturated steam, working medium, in particular saturated steam, can be supplied again to the working volume so that condensed working medium can be replaced.

The use of a liquid piston is preferably cheaper than the use of other reciprocating compressors. In addition, due to the better sealing of a liquid piston, a higher pressure can preferably be achieved with a compact structure. In particular, high efficiencies can thus be achieved even with a comparatively low total output.

As an alternative to using a wall element, it is also possible to change the working volume, for example, to provide a plunger cylinder which can be moved into the working volume.

In one embodiment of the invention it is provided that the heat storage device comprises a pressure envelope which separates the working volume from the storage volume. The pressure envelope preferably comprises a pressure envelope wall which is designed in particular to be pressure-resistant. Preferably, by means of the wall element, contact of the displacement liquid that can be supplied to the displacement volume with the pressure envelope of the heat storage device, in particular with the pressure envelope wall, can be avoided.

The pressure envelope is designed, for example, as a pressure vessel.

Alternatively, it is possible that the pressure envelope is designed as a pipe register. Such a pipe register is preferably arranged at least approximately completely in the storage volume.

The pressure envelope wall preferably comprises a pressure envelope material which has a thermal conductivity λ of in particular at least 50 W / m.K. This enables particularly good heat transfer from the working medium to the storage medium and vice versa.

The heat transfer device preferably comprises the pressure envelope or is formed by it.

The pressure envelope wall is in particular arranged at least in regions at a distance from the wall element.

The pressure envelope and / or the pressure envelope wall extend in particular concentrically to a longitudinal axis.

The wall element is preferably arranged concentrically to the pressure envelope and / or to the pressure envelope wall.

The wall element is in particular arranged at least in sections at a distance from the pressure envelope and / or the pressure envelope wall.

The pressure envelope and / or the pressure envelope wall has in particular a cylindrical, preferably a circular cylindrical, cross section. A cross section of the pressure envelope and / or the pressure envelope wall is understood to mean in particular a cross section taken perpendicular to the longitudinal axis of the pressure envelope and / or the pressure envelope wall.

By means of a circular cylindrical cross section of the pressure envelope and / or the pressure envelope wall, a high pressure resistance of the pressure envelope can preferably be achieved.

In one embodiment of the invention it is provided that the wall element is at least in one contact area or in several contact areas in sections flat, in particular sealingly, rests on the pressure envelope, in particular on a pressure envelope wall of the pressure envelope, the wall element and / or the pressure envelope including one or more channels and / or one or more grooves in which the wall element does not lie flat against the pressure envelope and which limit a dead volume for receiving the working medium.

The channels and / or the grooves are preferably arranged or formed only in the wall element or only in the pressure envelope.

Alternatively or in addition to this, it is conceivable that the channels and / or the grooves are arranged or formed both in the wall element and in the pressure envelope and are thus delimited by the wall element on the one hand and the pressure envelope on the other.

The channels and / or the grooves essentially form the dead volume. The channels and / or the grooves are preferably designed in a cross section such that a ratio of the displacement volume to the dead volume is as large as possible. In order to be able to achieve the greatest possible increase in the working medium pressure, a ratio of the displacement volume to the dead volume of up to 50: 1 is particularly desirable.

A cross section of the channels and / or the grooves is understood to mean in particular a cross section taken perpendicular to their longitudinal extension.

In one embodiment of the invention it is provided that the heat storage device comprises a heat conducting structure for transferring heat from the working medium to the storage medium or vice versa, which structure is arranged in the storage volume.

The heat conduction structure preferably comprises rib elements which abut the pressure envelope at least in sections, in particular continuously, in the longitudinal direction and are formed along a longitudinal extent of the channels and / or the grooves.

A longitudinal extension is in particular an extension along a longitudinal axis of the pressure envelope.

Preferably, heat can be transferred to or supplied to the storage medium by means of the heat conduction structure.

As an alternative or in addition to this, heat can preferably be withdrawn from the storage medium by means of the heat-conducting structure or can be removed from it.

In one embodiment of the invention it is provided that the pressure change device comprises a pump for supplying a displacement liquid, in particular an at least approximately incompressible displacement liquid, into the displacement volume.

The pump is designed in particular to feed the liquid into the displacement volume.

A line is preferably provided which is fluidly, in particular hydraulically, connected or connectable to the displacement volume. The line opens in particular into the displacement volume.

The line preferably opens into the displacement volume in a region of the wall element which is lower in the direction of gravity.

It can be favorable if the pressure change device further comprises a drive motor, in particular an electric motor, for driving the pump.

It can furthermore be favorable if the heat storage device comprises a control device by means of which the pressure changing device can be controlled to change the working medium pressure.

The control device is designed in particular for controlling the pump of the pressure change device.

The controller is preferably designed to control the drive motor that drives the pump.

In one embodiment of the invention it is provided that the storage medium comprises a latent heat storage medium and / or a storage medium for storing sensible heat.

The latent heat storage medium includes, for example, nitrate salts or paraffin.

The storage medium is preferably a bed of latent heat storage medium or latent heat storage material.

In one embodiment of the invention it is provided that the heat storage device further comprises a pressure increasing device different from the pressure changing device for increasing the working medium pressure. Using the Pressure increasing device, a higher working medium pressure of the working medium can preferably be achieved, in particular before it is increased by means of the pressure changing device.

The pressure increasing device is preferably a pre-compressor and / or an additional compressor.

The present invention also relates to a working device, in particular a working device for providing mechanical work.

The present invention is therefore based on the further object of providing a working device by means of which mechanical work can be delivered and which can be produced easily and inexpensively.

This object is achieved by a working device with the features of claim 11.

The working device comprises at least one heat storage device pair, which comprises two heat storage devices according to one of claims 1 to 10.

The pressure change devices of each heat storage device preferably each include a wall element which each delimits a displacement volume for receiving a displacement liquid, in particular for receiving an at least approximately incompressible displacement liquid.

The displacement volumes of the two heat storage devices are preferably connected to one another fluidically, in particular hydraulically, by means of a connecting line.

The working device preferably comprises a hydraulic motor for providing mechanical and / or electrical energy, which is arranged in the connecting line and through which the displacement fluid can flow.

The hydraulic motor can in particular be flowed through in two opposite flow directions.

A direction of rotation of the hydraulic motor can preferably be switched in such a way that the direction of rotation of a shaft of the hydraulic motor for providing mechanical and / or electrical energy is identical regardless of the direction of flow.

The present invention also relates to a method for operating a heat storage device according to one of Claims 1 to 10.

The method preferably comprises the following: a loading step for supplying heat to the storage device by means of the heat transfer device, the loading step comprising: supplying a vaporous working medium, in particular supplying saturated steam, into the working volume; Increasing a working medium pressure of the working medium in the working volume, so that heat, in particular condensation heat, is transferred from the working medium to a storage medium arranged in the storage volume.

The working medium pressure is increased in particular in such a way that the working medium at least partially condenses.

The working volume connection of the heat storage device is preferably open when the working medium is fed into the working volume, but closed in the step of increasing the working medium pressure.

When the working medium pressure, in particular a saturated steam pressure, reaches a value at which the saturation temperature of the working medium and / or of the saturated steam is greater than a temperature of the storage medium, the working medium preferably condenses. In particular, heat can thus be transferred from the working medium to the storage medium.

It can be beneficial if the loading step is repeated cyclically.

A cycle duration of the loading step is preferably approximately 10 to approximately 60 seconds.

In particular, a latent heat storage medium, preferably a phase change material, or a storage medium for sensible heat is used as the storage medium. If a storage medium is used for sensible heat, the heat storage device can be operated in particular in a sliding pressure mode.

In an initial step, the latent heat storage medium and / or the phase material is still solid, for example, and the working medium, in particular saturated steam, is not yet compressed.

A working medium pressure is then preferably increased by means of the pressure changing device, for example by supplying a displacement liquid into the displacement volume and increasing the displacement volume.

In particular, water is used as the displacement liquid.

The working medium pressure preferably increases until the working medium pressure, in particular a saturated steam pressure, reaches a value at which the saturation temperature of the working medium and / or the saturated steam is greater than a temperature of the storage medium, so that the working medium condenses and heat is transferred from the working medium to the storage medium. A latent heat storage medium, in particular a phase change material, can be liquefied, for example.

The saturated steam is preferably not overheated when the working medium pressure is increased, since the displacement liquid, in particular liquid water, at least partially evaporates and additional saturated steam is thus generated.

In one embodiment of the method, it is provided that the method further comprises an unloading step for removing heat from the storage device by means of the heat transfer device, the unloading step comprising: feeding a liquid working medium, in particular feeding water, into the working volume; Evaporation of the working medium, in particular generating saturated steam by transferring heat from the storage medium to the working medium.

The liquid working medium, in particular water, is preferably supplied to the working volume by means of the working volume connection for supplying the working medium.

The liquid working medium, in particular water, is preferably supplied to the working volume in a boiling state. Evaporation of the working medium can thus preferably be facilitated.

The saturated steam generated can be used for heating, for example.

As an alternative or in addition to this, it is possible to use the saturated steam to drive a steam turbine, which in turn drives a generator to generate electrical power.

The invention also relates to a method for operating a working device according to claim 11. The method comprises in particular the following: Supplying liquid working medium, in particular supplying water, into the working volume of a first heat storage device of the at least one heat storage device pair, with heat from the storage medium being transferred to the liquid working medium is transmitted so that the working medium evaporates.

The method further comprises in particular the following: Displacement of a displacement fluid from the displacement volume of the first heat storage device of the at least one heat storage device pair through the connecting line into the displacement volume of the second heat storage device of the at least one heat storage device pair, so that the hydraulic motor arranged in the connecting line is flowed through and mechanical and / or electrical Energy is provided.

The displacement liquid is preferably displaced from the displacement volume of the first heat storage device by means of the working medium evaporated in the first heat storage device.

Further preferred features and / or advantages of the invention are the subject of the following description and the graphic representation of exemplary embodiments.

• 1 eine schematische Schnittansicht einer Wärmespeichervorrichtung mit einer separat gezeigten Pumpe einer Druckänderungseinrichtung;
• 2 eine schematische Schnittansicht der Wärmespeichervorrichtung aus 1;
• 3 eine schematische Schnittansicht der Wärmespeichervorrichtung aus 2 längs der Linie III-III in 2;
• 4 eine schematische Schnittansicht der Wärmespeichervorrichtung aus 2 längs der Linie IV-IV in 2;
• 5 eine vergrößerte Darstellung eines weiteren Ausführungsbeispiels einer Wärmespeichervorrichtung in einem Schnitt gemäß 3;
• 6 eine vergrößerte Darstellung des Bereichs VI in 5;
• 7 eine schematische Darstellung einer Arbeitsvorrichtung, welche ein Wärmespeichervorrichtungspaar mit zwei Wärmespeichervorrichtungen umfasst;
• 8 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 in einem Anfangszustand eines Beladezyklus;
• 9 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 beim Erhöhen eines Arbeitsmediumdrucks in einem Beladezyklus;
• 10 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 beim weiteren Verdichten eines Arbeitsmediums und Übertragen von Wärme vom Arbeitsmedium auf das Speichermedium in einem Beladezyklus;
• 11 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 mit einem vollständig mit einer Verdrängungsflüssigkeit gefüllten Verdrängungsvolumen in einem Beladezyklus;
• 12 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 beim Expandieren eines Arbeitsmediums, welches eine Verdrängungsflüssigkeit aus dem Verdrängungsvolumen verdrängt, in einem Beladezyklus;
• 13 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 beim Füllen des Arbeitsvolumens mit Arbeitsmedium, welches dabei Verdrängungsflüssigkeit aus dem Verdrängungsvolumen verdrängt, in einem Beladezyklus;
• 14 eine schematische Darstellung der Wärmespeichervorrichtung aus 1 in einem Entladezyklus, wobei dem Arbeitsvolumen flüssiges Arbeitsmedium zugeführt wird, wobei Wärme vom Speichermedium auf das Arbeitsmedium übertragen wird und dieses verdampft wird;
• 15 eine schematische Darstellung der Arbeitsvorrichtung aus 7 in einem Anfangszustand eines Entladezyklus;
• 16 eine schematische Darstellung der Arbeitsvorrichtung aus 7 beim Zuführen von flüssigem Arbeitsmedium in einem Entladezyklus;
• 17 eine schematische Darstellung der Arbeitsvorrichtung aus 7, wobei Wärme von einem Speichermedium auf das flüssige Arbeitsmedium übertragen wird und dieses verdampft und somit Verdrängungsflüssigkeit aus dem Verdrängungsvolumen in eine Verbindungsleitung verdrängt, in einem Entladezyklus;
• 18 eine schematische Darstellung der Arbeitsvorrichtung aus 7 in einem Endzustand eines Entladezyklus;
• 19 eine schematische Darstellung eines Diagramms, welches einen Arbeitsvolumendruck in Abhängigkeit eines Anteils zeigt, welchen ein Verdrängungsvolumen in einem Arbeitsvolumen einnimmt; und
• 20 eine schematische Darstellung eines Diagramms, welches eine Sättigungstemperatur eines Arbeitsmediums in Abhängigkeit eines Anteils zeigt, welchen ein Verdrängungsvolumen in einem Arbeitsvolumen annimmt.

In the drawings show:

• 1 a schematic sectional view of a heat storage device with a separately shown pump of a pressure change device;
• 2 a schematic sectional view of the heat storage device 1 ;
• 3 a schematic sectional view of the heat storage device 2 along the line III-III in 2 ;
• 4th a schematic sectional view of the heat storage device 2 along the line IV-IV in 2 ;
• 5 an enlarged illustration of a further embodiment of a heat storage device in a section according to 3 ;
• 6th an enlarged view of the area VI in 5 ;
• 7th a schematic representation of a working device which comprises a pair of heat storage devices with two heat storage devices;
• 8th a schematic representation of the heat storage device 1 in an initial state of a loading cycle;
• 9 a schematic representation of the heat storage device 1 when increasing a working medium pressure in a loading cycle;
• 10 a schematic representation of the heat storage device 1 when further compressing a working medium and Transferring heat from the working medium to the storage medium in a loading cycle;
• 11 a schematic representation of the heat storage device 1 with a displacement volume completely filled with a displacement liquid in one loading cycle;
• 12th a schematic representation of the heat storage device 1 when expanding a working medium, which displaces a displacement liquid from the displacement volume, in a loading cycle;
• 13th a schematic representation of the heat storage device 1 when filling the working volume with working medium, which in the process displaces displacement fluid from the displacement volume, in one loading cycle;
• 14th a schematic representation of the heat storage device 1 in a discharge cycle, the working volume being supplied with liquid working medium, heat being transferred from the storage medium to the working medium and the working medium being evaporated;
• 15th a schematic representation of the working device 7th in an initial state of a discharge cycle;
• 16 a schematic representation of the working device 7th when supplying liquid working medium in one discharge cycle;
• 17th a schematic representation of the working device 7th , wherein heat is transferred from a storage medium to the liquid working medium and this evaporates and thus displaces displacement liquid from the displacement volume into a connecting line, in a discharge cycle;
• 18th a schematic representation of the working device 7th in a final state of a discharge cycle;
• 19th a schematic representation of a diagram which shows a working volume pressure as a function of a proportion which a displacement volume occupies in a working volume; and
• 20th a schematic representation of a diagram which shows a saturation temperature of a working medium as a function of a proportion which a displacement volume assumes in a working volume.

Identical or functionally equivalent elements are provided with the same reference symbols in all figures.

1 shows a heat storage device designated as a whole by 100.

The heat storage device 100 comprises a storage device 102 .

The storage device 102 includes a storage volume 104 for recording from storage medium 106 to store heat.

The heat storage device 100 further comprises a heat transfer device 108 , by means of which heat from a working medium 109 on the storage medium 106 and vice versa is transferable (cf. 8th to 14th ).

The heat transfer device 108 includes a volume of work 110 for taking up the working medium 109 , the volume of work 110 at least approximately completely within the storage device 102 is arranged.

The volume of work 110 stands with the storage volume 104 especially in thermal contact.

The heat storage device 100 preferably comprises a pressure changing device 112 to change, in particular to increase or decrease a working medium pressure of the working medium 109 in volume of work 110 .

The heat storage device 100 , especially the pressure change device 112 , preferably comprises a wall element 114 , which is a displacement volume 116 for taking up a displacement liquid 117 , in particular to take up an at least approximately incompressible displacement liquid, limited (cf. 9 to 13th ).

The wall element 114 divides the volume of work 110 especially in a dead volume 118 and, in particular, a maximum displacement volume 116 .

The wall element 114 preferably extends concentrically to a longitudinal axis 120 .

The wall element 114 is preferably cylindrical, in particular circular cylindrical.

The wall element 114 is in particular a pipe 122 .

The wall element 114 therefore preferably has an annular cross-section. Under a cross section of the wall element 114 becomes a perpendicular to the longitudinal axis 120 Understood cross section taken.

The wall element 114 preferably has a thermal conductivity λ of at most 10 W / mK.

The heat storage device 100 also includes, in particular, a pressure envelope 124 which is the volume of work 110 from the storage volume 104 separates.

The pressure envelope 124 preferably comprises a pressure envelope wall 126 .

The pressure envelope wall 126 is designed in particular pressure-resistant.

In the embodiments of the heat storage device shown in the figures 100 is the pressure envelope 124 especially as a pressure vessel 128 educated.

Alternatively, it is conceivable that the pressure envelope 124 is designed as a pressure-resistant pipe register, which is at least approximately completely within the storage volume 104 is arranged.

The pressure envelope 124 and / or the pressure envelope wall 126 preferably also extend concentrically to the longitudinal axis 120 .

The pressure envelope 124 and / or the pressure envelope wall 126 in particular have a cylindrical, preferably a circular cylindrical cross section. Under a cross section of the pressure envelope 124 and / or the pressure envelope wall 126 becomes in particular one perpendicular to the longitudinal axis 120 Understood cross section taken.

The pressure envelope 124 and / or the pressure envelope wall 126 are in particular at least partially spaced from the wall element 114 arranged.

The pressure sleeve wall preferably comprises 126 a printing sleeve material 130 , which in particular has a thermal conductivity λ of at least 50 W / mK.

The wall element is preferably 114 and the pressure envelope 124 and / or the pressure envelope wall 126 arranged concentrically to one another.

The heat storage device 100 also includes in particular a working volume connection 132 for supplying the working medium 109 in the volume of work 110 and / or to discharge the working medium 109 from the volume of work 110 .

The heat storage device 100 further preferably comprises a displacement volume connection 134 for supplying displacement liquid 117 into the displacement volume 116 and / or for removing displacement liquid 117 from the displacement volume 116 .

The one in the 1 to 4th Shown embodiment of the heat storage device 100 are the change element 114 the pressure change device 112 and the pressure envelope 124 and / or the pressure envelope wall 126 spaced from each other.

The one in the 5 and 6th Shown embodiment of the heat storage device 100 is the wall element 114 but in several investment areas 136 at least in sections flat on the pressure envelope 124 , especially on the pressure envelope wall 126 , at.

The wall element 114 preferably comprises several channels 138 and / or grooves 140 in which the wall element 114 not flat on the pressure envelope 124 and / or on the pressure envelope wall 126 is applied.

The channels 138 and / or the grooves 140 form in the 5 and 6th Shown embodiment of the heat storage device 100 preferably essentially the dead volume 118 .

In the embodiments of the heat storage device shown in the figures 100 is in the storage volume 104 as a storage medium 106 preferably a latent heat storage medium 142 , especially a phase change material 144 intended.

The latent heat storage medium preferably comprises 142 Nitrate salts and / or paraffin.

That in the 5 and 6th Shown embodiment of the heat storage device 100 preferably comprises a heat conduction structure 145 for the transfer of heat from the working medium to the storage medium or vice versa.

The thermal conduction structure 145 is at least approximately completely in the storage volume 104 arranged.

The thermal conduction structure 145 in particular includes rib elements 146 .

The rib elements 146 are preferably at least partially on the pressure envelope 124 and / or on the pressure envelope wall 126 and are preferably along a longitudinal extension of the channels 138 and / or the grooves 140 aligned.

Under a longitudinal extension of the channels 138 and / or the grooves 140 becomes in particular an extension along the longitudinal axis 120 the pressure envelope 124 Understood.

The rib elements 146 lie in the longitudinal direction in particular continuously on the pressure envelope 124 and / or on the pressure envelope wall 126 at.

The one in the 5 and 6th Shown embodiment of the heat storage device 100 become the channels 138 and / or the grooves 140 in particular only indirectly from the wall element 114 limited.

The one in the 5 and 6th Shown embodiment of the heat storage device 100 are in the wall element 114 especially heat conduction inserts 148 the heat conduction structure 145 used.

To improve the supply of heat from the working medium 109 on the storage medium 106 , in particular for supplying heat to a latent heat storage medium 142 and / or a phase change material 144 , are the thermal inserts 148 the heat conduction structure 145 with the rib elements 146 especially thermally coupled.

The pressure changing device 112 of the embodiments of the heat storage device shown in the figures 100 preferably comprises a pump 150 for supplying a displacement liquid 117 , in particular an at least approximately incompressible displacement liquid 117 , into the displacement volume 116 .

The pump 150 is preferably for supplying the displacement liquid 117 into the displacement volume 116 educated.

A line in particular is required for this 152 provided, which with the displacement volume 116 is fluidically, in particular hydraulically, connected or connectable.

The administration 152 is preferably by means of the displacement volume connection 134 with the displacement volume 116 connectable.

The administration 152 opens in particular into one in the direction of gravity 153 lower area of the wall element 114 at the displacement connection 134 .

The pressure changing device 112 the heat storage device 100 preferably comprises a drive motor 154 , especially an electric motor 156 , which by means of a shaft 158 with the pump 150 connected or connectable.

The drive motor 154 and / or the electric motor 156 is especially for driving the pump 150 trained so that the pump 150 in particular a displacement liquid 117 by means of a line 160 from a reservoir 162 into the line 152 can promote.

The administration 152 is optionally also available with the working volume connection 132 connectable, for example by means of a directional control valve not shown in the figures.

The heat storage device 100 preferably comprises a control device 164 , by means of which the pressure change device 112 , in particular to change a working medium pressure, can be controlled.

The control device 164 is especially used to control the pump 152 the pressure change device 112 , preferably by controlling the pump 152 driving drive motor 154 , educated.

By means of the working volume connection 132 is the volume of work 110 Working medium 109 , especially vaporous working medium 109 from a steam source 166 feedable.

The heat storage device 100 preferably comprises one of the pressure changing means 112 various pressure boosting devices 168 .

The pressure booster 168 is designed in particular to increase a working medium pressure before the working medium 109 through the working volume connection 132 the volume of work 110 is fed.

The pressure booster 168 is in particular an additional compressor 170 .

As a working medium 109 is the volume of work 110 the heat storage device 100 preferably water, in particular saturated steam, can be supplied. As a rule, water is ubiquitous, inexpensive and, in particular, non-toxic to humans and therefore comparatively harmless.

The displacement connection 134 is also preferably used to discharge the working medium 109 , preferably of steam, in particular of saturated steam, from the displacement volume 116 educated.

As a displacement fluid 117 is the displacement volume 116 in particular water can be supplied.

7th shows a working device 200 , in particular a working device 200 for providing mechanical and / or electrical energy.

The working device 200 includes a pair of thermal storage devices 202 .

The pair of thermal storage devices 202 includes two heat storage devices 100 according to one of the 1 to 6th shown embodiments. The pair of thermal storage devices 202 comprises in particular a left heat storage device 1001 and a right heat storage device 100r.

At the in 7th shown working device 200 are the displacement volumes 116 of the two heat storage devices 100 in particular by means of a connecting line 204 fluidically, in particular hydraulically, connected to one another.

The working device 200 preferably comprises a hydraulic motor 206 for providing mechanical and / or electrical energy.

The hydraulic motor 206 is in the connection line 204 arranged and by means of the displacement liquid 117 permeable.

Mechanical work is done by the hydraulic motor 206 in particular by means of a shaft 208 deliverable.

The working device 200 furthermore particularly comprises a first heat exchanger 210 , which is also in the connection line 204 , especially between the in 7th heat storage device 1001 shown on the left and the hydraulic motor 206 , is arranged.

The working device 200 furthermore particularly comprises a second heat exchanger 212 , which in particular with the working volume connection 132 the in 7th right heat storage device 100r is connected.

The hydraulic motor 206 is preferably in two opposite directions by means of the displacement liquid 117 permeable.

Coming back to those in the 1 to 6th shown heat storage device 100 it should be noted that the volume of work 110 in particular to increase or decrease the working medium pressure by means of the pressure change device 112 can be reduced or enlarged.

The volume of work 110 the heat storage device 100 is by means of the pressure change device 112 preferably by a particularly maximum displacement volume 116 on the dead volume 118 shrinkable.

The dead volume 118 is in particular a volume over which the working volume 110 cannot be reduced in size.

The displacement volume 116 is by means of the pressure changing device 112 especially adjustable.

Preferably the displacement is 116 by means of the pressure changing device 112 can be enlarged or reduced.

The displacement volume 116 by means of the displacement volume connection 134 from the pump 150 supplied displacement liquid 117 , in particular supplied liquid water, forms in the wall element 114 a liquid piston 172 (cf. 9 ).

The liquid piston 172 in particular forms a displacement element 174 to reduce or enlarge the work volume 110 .

The displacement volume 116 is in particular by means of the displacement element 174 and / or the liquid piston 172 adjustable, in particular can be enlarged or reduced.

The displacement volume 116 is in particular to a maximum displacement volume 116 enlargeable if a meniscus of the liquid piston 172 an upper edge 176 des as a pipe 122 trained wall element 114 achieved (cf. 11 ).

In principle, it is conceivable as an alternative to a liquid piston 172 in the wall element 114 and / or in the pipe 122 to move a mechanical piston. By using a liquid piston 172 can preferably have a high degree of tightness between liquid pistons 172 and wall element 114 and / or pipe 122 will be realized.

Consequently, by using a liquid piston 172 especially high pressure on the work volume 110 are exercised, so that overall a high working volume pressure can be achieved.

By having an additional wall element 114 inside the pressure envelope 124 and / or the Pressure envelope wall 126 is provided, it can be avoided that the displacement liquid 117 directly with the pressure envelope 124 and / or the pressure envelope wall 126 comes into contact.

As the wall element 114 preferably has a thermal conductivity λ of at most 10 W / m · K, thermal insulation of the displacement liquid can in particular 117 in displacement volume 116 of a working medium 109 can be achieved, that is, a heat transfer from the working medium 109 on the displacement liquid 117 is preferably minimized.

In addition, the fact that the pressure envelope 124 and / or the pressure envelope wall 126 a printing sleeve material 130 comprises, which has a thermal conductivity λ of at least 50 W / mK, an efficient heat transfer from a working medium 109 , especially from saturated steam, to the storage medium 106 , in particular a latent heat storage medium 142 can be achieved.

A method of operating the in the 1 to 6th shown heat storage device 100 is described below. The 8th to 13th show in particular partial steps of a loading cycle in which heat from the working medium 109 on the storage medium 106 is transmitted.

14th shows a partial step of a discharge cycle of the heat storage device 100 in what heat from the storage medium 106 on the working medium 109 is transmitted.

The in 8th The partial step shown is the total work volume 110 , that is, the dead volume 118 and the displacement volume 134 , Working medium 109 , especially saturated steam, via the working volume connection 132 from the steam source 166 fed. When the volume of work 110 by means of the steam source 166 and the pressure booster 168 with working medium 109 is filled, the working volume connection 132 locked.

In the next, in 9 The step shown now becomes the displacement fluid 117 , especially liquid water, the displacement volume 116 via the displacement connection 134 supplied and forms a liquid piston there 172 which is in the direction of an arrow 178 against the direction of gravity 153 rises to the top.

The displacement volume 116 is increased in particular, so that the work volume 110 is reduced and that in the volume of work 110 existing working medium 109 is compressed.

The working medium pressure of the working medium thus increases 109 in volume of work 110 .

When the displacement 116 more displacement fluid 117 is supplied, the liquid piston rises 172 , as in 10 shown in the direction of the arrow 178 up.

The volume of work 110 is further reduced and that in the work volume 110 existing working medium 109 further compressed.

If the working medium pressure, especially the saturated steam pressure, is in the working volume 110 reaches a value at which a saturation temperature of the working medium 109 , in particular the saturated steam, is greater than a temperature of the storage medium 106 , the working medium condenses 109 , especially the saturated steam, preferably on the pressure envelope 124 and / or on the pressure envelope wall 126 , with heat from the working medium 109 on the storage medium 106 is transmitted. Partly condensed working medium 109 is in the direction of the arrow 179 via the working volume connection 132 from the volume of work 110 discharged (cf. 10 ).

Condensed working medium 109 , especially condensed saturated steam, is displaced by evaporated liquid 117 , in particular replaced by evaporated water, which in the contact area of the liquid piston 172 with the working medium 109 evaporates.

When the displacement 116 via the displacement connection 134 by means of the pump 150 Displacement fluid 117 , particularly liquid water, has been supplied until the liquid piston 172 the top edge 176 of the wall element 114 reached is the volume of work 110 on the dead volume 118 decreased, whereas the displacement volume 116 is maximum (cf. 11 ).

The working medium 109 is now compressed to a maximum working medium pressure.

The displacement volume 116 is then by means of the pump 150 preferably no displacement liquid 117 more fed.

Rather, as in 12th shown, the displacement connection 134 opened so that displacement fluid 117 in the direction of the arrow 180 from the displacement volume 116 can flow.

That in the volume of work 110 existing and compressed working medium 109 , in particular the compressed saturated steam, can expand and the displacement liquid 117 , especially liquid water, from the displacement volume 116 in the direction of the arrow 180 through the displacement volume connection 134 displace.

About the displacement fluid 117 completely from the displacement volume 116 to displace the volume of work 110 by means of the working volume connection 132 Working medium 109 , especially saturated steam, from the steam source 166 and / or from the pressure booster 168 in the direction of the arrow 182 are supplied (cf. 13th ).

When the displacement liquid 117 completely from the displacement volume 116 is displaced, the in 8th Shown initial state of a loading cycle for supplying heat from the working medium 109 on the storage medium 106 reached again.

To the storage medium 106 To continue supplying heat, the loading step can in particular be repeated cyclically, preferably with a cycle duration of approximately 10 to approximately 60 seconds.

The 19th and 20th each show a dependence of a volume fraction of the displacement volume 116 which is the liquid piston 172 displaced, at the maximum possible work volume 110 . This proportion is particularly on the abscissa 184 applied.

19th points on the ordinate 186 a working medium pressure as a function of the volume fraction as well as an initial pressure which comes from the steam source 166 and / or the pressure booster 168 provided.

19th points on the ordinate 186 a dependency of the saturation temperature of the working medium 109 depending on an initial temperature of the working medium 109 .

From the 19th and 20th it is clear that the highest possible ratio of the maximum displacement volume 116 to dead volume 118 is desirable.

Therefore, the one in the 5 and 6th Shown embodiment of the heat storage device 100 the dead volume 118 thereby minimized that the wall element 114 in the investment areas 136 in particular sealing on the pressure envelope 124 and / or the pressure envelope wall 126 and thus the dead volume 118 essentially just from the channels 138 and / or from the grooves 140 is formed.

With the in the 5 and 6th Shown embodiment of the heat storage device 100 higher saturation vapor pressures and / or higher saturation temperatures are thus preferably achievable than with the 1 to 4th Shown embodiment of the heat storage device 100 .

For discharging the heat storage device 100 can, as in 14th shown the volume of work 110 via the working volume connection 132 Working medium 109 , especially liquid water in the direction of the arrow 182 are fed.

A supply of water is for example by means of the pump 150 from the reservoir 162 conceivable.

When the liquid working medium 109 , especially liquid water, in the boiling state the working volume 110 is supplied, the working medium evaporates 109 through thermal contact with that in the storage volume 104 arranged storage medium 106 and is at the displacement connection 134 in the direction of the arrow 180 discharged. The vaporous working medium 109 , in particular generated saturated steam, can now be used, for example, for heating and / or for driving a steam turbine, for example for generating electricity.

In the 15th to 18th is an alternate discharge cycle of a thermal storage device 100 using the example of in 7th shown working device 200 shown.

15th shows a first step of a discharge cycle with the provision of mechanical and / or electrical energy at the hydraulic motor 206 .

The displacement volume 116 the in 15th left heat storage device 1001 of the working device 200 is complete with displacement fluid 117 , especially with water 214 , up to the top 176 of the wall element 114 filled and there forms a liquid piston 172 . The rest of the dead volume 118 the volume of work 110 is with vaporous working medium 109 , in particular with saturated steam, filled, for example with saturated steam from the steam source 166 .

The entire volume of work 110 , that is, dead volume 118 and displacement volume 116 who is in 15th The heat storage device 100r shown on the right are also with working medium 109 , especially with saturated steam.

The two displacement connections 134 connecting connecting line 204 is also with displacement fluid 117 , especially with water 214 , filled.

In an in 16 The step shown is liquid working medium 109 , especially water 214 , for example with the in 1 shown pump 150 especially from the reservoir 162 through the working volume connection 132 the dead volume 118 the in 16 left heat storage device 1001 in the direction of the arrow 216 fed. In particular, it gets so much water 214 the dead volume 118 the in 16 left heat storage device 1001 supplied until this almost the upper edge 176 of the wall element 114 reached.

The liquid working medium 109 , especially liquid water 214 , is especially in the boiling state of in 16 Heat storage device 1001 shown on the left supplied.

In the volume of work 110 the in 16 The heat storage device 1001 shown on the left is the vaporous working medium 109 , especially the saturated steam, compressed.

The dead volume 118 the in 16 left shown heat storage device 1001 supplied liquid working medium 109 , especially the liquid water 214 , comes into thermal contact with the storage medium 106 so that heat from the storage medium 106 on the liquid working medium 109 is transferred and this evaporates (cf. 17th ) and a liquid level 218 of the water 214 in dead volume 118 sinks.

Because of the volume of work 110 expanding vapor becomes the piston of liquid 172 in the in 17th Heat storage device 1001 shown on the left in the direction of the arrow 220 displaced downwards.

The displacement fluid 117 becomes from the displacement volume connection 134 the in 17th heat storage device 1001 shown on the left through the connecting line 204 and the displacement connection 134 the in 17th heat storage device 100r shown on the right into the displacement volume 116 the same displaced, so that there is a liquid piston 172 in the direction of the arrow 222 rises to the top.

When flowing through the in the connection line 204 arranged hydraulic motor is by means of the shaft 208 mechanical energy 224 and / or electrical energy 226 deliverable.

A pressure of the displacement fluid 117 in the connection line 204 is when flowing through the hydraulic motor 206 especially reduced.

Preferably in the second heat exchanger 212 at the displacement connection 134 the in 17th Heat storage device 100r shown on the right condenses out flowing saturated steam and thereby heat 228 submitted.

The one in the second heat exchanger 212 condensed saturated steam preferably flows into the working volume 110 the in 17th Heat storage device 100r shown on the right.

In the first heat exchanger 210 saturated steam is preferably condensed, using the first heat exchanger 210 warmth 230 is deductible (cf. 18th ).

At the end of the cycle the heat storage devices have 100 preferably swapped their position, i.e. a state of the in 18th The heat storage device 100r shown on the right corresponds in particular at least approximately to a state of that in FIG 15th heat storage device 1001 shown on the left, whereas a state of the in 18th The heat storage device 1001 shown on the left at least approximately corresponds to a state of the in 15th corresponds to the heat storage device 100r shown on the right.

It is therefore preferably provided that the heat exchanger 210 , 212 accordingly with the two heat storage devices 100 are interconnected, with the flow direction of the hydraulic motor 206 is changeable.

For further provision of mechanical and / or electrical energy 224 , 226 by means of the hydraulic motor 206 is now the working volume connection 132 the in 18th Heat storage device 100r shown on the right, liquid working medium 109 , especially water 214 , can be added in the boiling state and the discharge cycle starts again.

Overall, a heat storage device 100 are provided, by means of which, using mechanical and / or electrical energy, storage and / or release of high-temperature heat quantities is made possible.

List of reference symbols

100

Heat storage device

102

Storage facility

104

Storage volume

106

Storage medium

108

Heat transfer device

109

Working medium

110

Volume of work

112

Pressure change device

114

Wall element

116

Displacement volume

117

Displacement fluid

118

Dead volume

120

Longitudinal axis

122

pipe

124

Pressure envelope

126

Pressure envelope wall

128

Pressure vessel

130

Printing sleeve material

132

Working volume connection

134

Displacement connection

136

Investment area

138

channel

140

Groove

142

Latent heat storage medium

144

Phase change material

145

Thermal structure

146

Rib element

148

Thermal insert

150

pump

152

management

153

Direction of gravity

154

Drive motor

156

Electric motor

158

wave

160

management

162

reservoir

164

Control device

166

Steam source

168

Pressure booster

170

Additional compressor

172

Liquid piston

174

Displacement element

176

Top edge

178

arrow

179

arrow

180

arrow

182

arrow

184

abscissa

186

ordinate

200

Working device

202

Pair of thermal storage devices

204

Connecting line

206

Hydraulic motor

208

wave

210

first heat exchanger

212

second heat exchanger

214

water

216

arrow

218

Liquid level

220

arrow

222

arrow

224

mechanical energy

226

electrical power

228

warmth

230

warmth

Claims (14)

A heat storage device (100), comprising: a storage device (102) which has a storage volume (104) for receiving storage medium (106) for storing heat; a heat transfer device (108) by means of which heat can be transferred from a working medium (109) to the storage medium (106) and vice versa; wherein the heat transfer device (108) has a working volume (110) for receiving the working medium (109), the working volume (110) being arranged at least in sections, in particular at least approximately completely, within the storage device (102) and with the storage volume (104) in is in thermal contact; wherein the heat storage device (100) further comprises a pressure changing device (112) for changing, in particular for increasing or decreasing, a working medium pressure of the working medium (109) in the working volume (110), characterized in that the working volume (110) for increasing or decreasing the Working medium pressure can be reduced or increased by means of the pressure change device (112). Heat storage device (100) according to Claim 1 , characterized in that the working volume (110) can be reduced by a displacement volume (116) to a dead volume (118) by means of the pressure change device (112), the displacement volume preferably being adjustable (116) by means of the pressure change device (112). Heat storage device (100) according to Claim 1 or 2 , characterized in that the Pressure changing device (112) comprises a displacement element (174) for reducing or increasing the working volume (110). Heat storage device (100) according to one of the Claims 1 to 3 , characterized in that the pressure change device (112) comprises a wall element (114) which delimits a displacement volume (116) for receiving a displacement liquid (117), in particular for receiving an at least approximately incompressible displacement liquid (117). Heat storage device (100) according to one of the Claims 1 to 4th , characterized in that the heat storage device (100) comprises a pressure envelope (124) which separates the working volume (110) from the storage volume (104). Heat storage device (100) according to Claim 4 and 5 , characterized in that the wall element (114) in a contact area (136) or in several contact areas (136) at least partially rests flat on the pressure envelope (124), in particular on a pressure envelope wall (126) of the pressure envelope (124), the Wall element (114) and / or the pressure envelope (124) comprises one or more channels (138) and / or one or more grooves (140) in which the wall element (114) does not lie flat against the pressure envelope (124) and which have a Limit dead volume (118) for receiving the working medium (109). Heat storage device (100) according to Claim 6 , characterized in that the heat storage device (100) comprises a heat conduction structure (145) for transferring heat (238, 240) from the working medium (109) to the storage medium (106) or vice versa, the heat conduction structure (145) in the storage volume (104) is arranged and comprises rib elements (146) which bear against the pressure sleeve (124) at least in sections and are aligned along a longitudinal extension of the channels (138) and / or grooves (140). Heat storage device (100) according to one of the Claims 1 to 7th , characterized in that the pressure change device (112) comprises a pump (150) for supplying a displacement liquid (117), in particular an at least approximately incompressible displacement liquid (117), into the displacement volume (116). Heat storage device (100) according to one of the Claims 1 to 8th , characterized in that the storage medium (106) comprises a latent heat storage medium (142) and / or a storage medium (106) for storing sensible heat. Heat storage device (100) according to one of the Claims 1 to 9 , characterized in that the heat storage device (100) further comprises a pressure-increasing device (168) different from the pressure-changing device (112) for increasing the working medium pressure. Working device (200), in particular for providing mechanical work, comprising at least one heat storage device pair (202), which has two heat storage devices (100) according to one of the Claims 1 to 10 comprises, characterized in that the pressure changing device (112) of each heat storage device (100) each comprises a wall element (114), each of which has a displacement volume (116) for receiving a displacement liquid (117), in particular for receiving an at least approximately incompressible displacement liquid (117 ), the displacement volumes (116) of the two heat storage devices (100) being fluidically, in particular hydraulically, connected to one another by means of a connecting line (204), the working device (200) having a hydraulic motor (206) for providing mechanical (224) and / or electrical (226) energy, which is arranged in the connecting line (204) and through which the displacement liquid (117) can flow. Method for operating a heat storage device (100) according to one of the Claims 1 to 10 , wherein the method comprises: a loading step for supplying heat to the storage device (102) by means of the heat transfer device (108), the loading step comprising: supplying a vaporous working medium (109), in particular supplying saturated steam, into the working volume (110 ); - Increasing a working medium pressure of the working medium (109) in the working volume (110), so that heat, in particular condensation heat, is transferred from the working medium (109) to a storage medium (106) arranged in the storage volume (104). Procedure according to Claim 12 , characterized in that the method further comprises an unloading step for removing heat from the storage device (102) by means of the heat transfer device (108), the unloading step comprising: - supplying a liquid working medium (109), in particular supplying water (214), into the working volume (110); - Evaporation of the working medium (109), in particular generation of saturated steam, in that heat is transferred from the storage medium (106) to the working medium (109). Method for operating a work device (200) according to Claim 11 , characterized in that the method comprises: - Supplying liquid working medium (109), in particular supplying water (214), into the working volume (110) of a first heat storage device (100) of the at least one heat storage device pair (202), with heat from the storage medium (106) is transferred to the liquid working medium (109) so that the working medium (109) evaporates; - Displacement of a displacement liquid (117) from the displacement volume (116) of the first heat storage device (100) of the at least one heat storage device pair (202) through the connecting line (204) into the displacement volume (116) of the second heat storage device (100) of the at least one heat storage device pair (202) ), so that the hydraulic motor (206) arranged in the connecting line (204) is flowed through and mechanical (224) and / or electrical (226) energy is provided.

Images