DE2019567A1 - Process for regulating the charging of electrically operated heat accumulators for heating purposes, such as heat storage space heaters, heat storage central heating systems or the like. - Google Patents

Description

Process for regulating the charging of electrically operated heat storage systems fttr heating purposes, such as heat storage space heaters, heat storage central heating systems o. The like. "When charging heat storage space heaters that run on electricity or another heat transfer medium are not only charged by the energy supplier Allowed loading times to be taken into account, but it's for an economical one Heating is also necessary, the storage stoves are in the charging time - the main charging time is on usually between 10 p.m. and 6 a.m. - only to be charged as far as the next wn Days is the amount of heat expected to be required. It's already suggested the outside air temperature, especially the outside wall temperature, as a benchmark of the building in question, which is continuously measured, whereby also the residual heat remaining in the storage heater is taken into account to make it uneconomical Avoid overloading.

The practical implementation of this charging control can be known in This can be done, for example, by a process that combines the outside air temperature and the residual heat continuously recorded as a control variable in the heat storage tank and electrical resistances are shown, which work in such a way that low temperatures increasing Resistance values are assigned and that these resistances with one by an electromotive Timing driven rotary resistor (potentiometer) are kept in series, the sum of aiier of these resistances in a measuring circuit with a predetermined Resistance can be compared electrically, that in the case of the coincidence of both Values control processes are triggered, which switch on the heat storage space heater or switch off (DAS 1 295 160).

Numerous proposals have also been made as to charging to lay within the released loading time so that, on the one hand, the radiation losses of the charged heat storage space heaters in the time between the end of charging Remain within tolerable limits until the start of the discharge time and, on the other hand, within the charging time for the energy network, undesired peak loads can be avoided.

Meanwhile with the further expansion of the electricity works the best of the utility companies to give fixed loading times changed. One is increasingly ready, all times in which are in the network, and indeed in the individual A low load is set for the charging of the distribution network sections release heat storage. This release should no longer be from a central point set out to Times, but depending on the load of the transformer of the relevant network section.

The invention has set itself the task of a method sur regulation of the charging sound electrically operated heat storage for heating purposes such as heat storage room heating stove, heat storage central heating o in familiar Depending on the outside air temperature, the residual heat remaining in the heat storage tank is taken into account.

The invention is that the temperature of the Xets section transformer is continuously measured and the measured variable determined in connection with the outside air temperature and the residual heat is used to switch the heat accumulator on and off.

To carry out this regulation with the help of simple means, operated The invention is preferably based on the known method mentioned at the outset which the temperature variables are continuously measured and by temperature-dependent electrical Resistors are shown.

Accordingly, there is a further embodiment of the invention in this, that in addition to the temperature of the Netsabschnittstransformatore in a known manner the outside air temperature and the temperature of the residual heat are continuously recorded and are represented by temperature-dependent, electrical resistances, the such work, that lower wet temperatures are associated with increasing resistance values are, and that the resistors are connected in series, their sum in one Measuring circuit is electrically compared with a predetermined comparison resistance and if the two values match, control processes in a known manner triggered, which switch the heat accumulator on or off.

In the case of the invention, charging takes place automatically during the low load time of the section transformer; because its warming is a Wet stick for his stress. Since the invention all off-peak times for the charging can be exploited, both the heat storage and the network section transformers even be designed smaller.

The method according to the invention can also be used for simultaneous regulation for charging a large number of heat accumulators e.g.

be used in an apartment or a rental building that has a different Have a need for heat.

A device which meets these conditions is in further Embodiment of the invention characterized by a central control device which connected to the resistance of the network section transformer and the outside air sensor is, as well as by the charge controllers connected in parallel to this control unit for the individual heat accumulators, which are also connected to the resistors of the residual heat sensor the heat accumulator are connected.

In addition, with this arrangement, the possibility of an individual According to the invention, having to adapt the charging strength is also in the charge regulators additionally arranged a manually adjustable potentiometer through which either the sum of the measured values or the specified comparison resistance is changed can be.

For the details of the circuitry of this device, refer to the German patent application P 15 54 735.0 referenced.

The resistance values of the outside air temperature, the temperature of the residual heat in the heat storage system and the temperature of the cut-off transformer are shown in of a measuring circuit summed up electrically according to the following equation: (Rwo + #tw x αw) + (Rqo + #tq x αq) + (Rto + #tt x αt) = K weather residual heat transformer heat Constant The individual summands are made up as follows: 1. The weather resistance value consists of: a) Fixed resistance Rwo e.g. based on an outside air temperature of 200C b) variable value ate currently w in which #tw is the temperature difference compared to 200G = tw - 20 ° C; αw is the temperature coefficient (# / ° C).

2. The residual heat resistance value consists of: a) Fixed resistance value Rqo e.g. related to 200C storage surface temperature (instead of the furnace core temperature, which is difficult to measure).

b) variable value #tq x αq, in which #tq is the temperature difference compared to 20 ° C = tq - 20 ° C α q means the temperature coefficient (# / ° C).

3. The transformer heat resistance value consists of: a) Fixed resistance value Rto e.g. based on 400C transformer temperature b) variable value dtt x αt, , in which #tt is the temperature difference compared to 400C = tt - 4000 is the temperature coefficient (# / ° C) means.

4. K is a given fixed resistance (reference resistance).

Depending on the variable proportions of the summands larger or smaller according to a smaller or larger weather or. Transformer temperature are, the value tq q is smaller or larger; i.e. the charge of the storage heater begins sooner or later and thus leads to a stronger or weaker charging.

Solve this equation for tq, where for the values Rwo to K are those given by the measuring resistors and correspondingly for the other resistors chosen numerical values are to be taken.

The following equation results: tq = 150 - 2.5 tw - 2.0 tt In this Equation are only tw = outside temperature and tt = transformer temperature in ° C to be used.

This equation is shown graphically in Fig. 1, where for Transformer temperature as a parameter, various values between 400C and 80 ° C can be used. In the range up to 400C the transformer affects the charging not at all.

800C is assumed here as the maximum permissible transformer temperature.

Example: With an outside air temperature of tw = +400, for example, and a discharged heat storage tank with q = 200C, the temperature of the transformer under normal load may be tt = 500C. The heat storage tank is heated to 30 ° C, which means that the transformer is raised to 550C at the same time. warms and the charging, which would have to take place due to the outside temperature from 4 ° C to 60 ° C, is initially interrupted. If the normal load on the transformer decreases later, for example to 4000, the heat accumulator is switched on and further charging to 600C. This means that the necessary charging is achieved and the heat storage tank is switched off. The game repeats itself when the heat storage tank cools down, for example by releasing heat.

The circuit of a device operating according to the above equation is shown in FIG.

1 denotes the resistance of the directly on the building wall located outside sensor, 2 the resistance of the residual heat sensor located on the storage heater 9 and 3 the resistance of the section transformer 4, which also has other consumers provided.

The resistors mentioned are connected in series. Your total will within the measuring circuit 5, which is fed by a constant voltage source 7 is electrically compared with a predetermined constant resistance 11. in the If the two values match, control processes are triggered that allow the Turning on the charging switch 6 cause the transformer 4 with the storage heater 9 connects.

Patent Claims:

Claims (4)

Claims: 1. A method for regulating the charging of electrically operated heat accumulators for heating purposes, in which the charging with regard to the released charging time depending on the load on the respective network section transformer and its level also known way, depending on the outside air temperature taking into account the residual heat remaining in the heat accumulator, characterized in that the temperature of the network section transformer is measured continuously and the measured variable determined in connection with the outside air temperature and the residual heat is used to switch the heat accumulator on and off will. 2. The method according to claim 1, characterized in that in addition to the Temperature of the network section transformer in a known manner also the outside air temperature and the temperature of the residual heat is continuously recorded and by temperature-dependent, electrical resistances are shown, which work in such a way that lower Moisture temperatures are associated with increasing resistance values, and that the resistances be connected in series, the sum of which in a measuring circuit with a - predetermined comparison resistance is compared electrically and in the event of a match both values are triggered in a known manner control processes, which the heat storage switch on or off. 3. Device for the simultaneous regulation of the charging of a large number of heat store according to the method according to claims 1 and 2, characterized by a central control unit, which with the resistance of the section transformer and the outside air sensor is connected, as well as by the connected in parallel this control unit connected charge controller for the individual heat storage, which are also connected to the resistors of the residual heat sensor of the heat storage are. 4. Apparatus according to claim 3, characterized in that in the Charge controllers also have a manually adjustable potentiometer for the individual Adjustment of the charging strength is arranged, through which either the sum of the Measured values or the specified comparison resistance can be changed.