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US20120318474A1 - Ground circuit in a low-energy system - Google Patents

Ground circuit in a low-energy system Download PDF

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Publication number
US20120318474A1
US20120318474A1 US13/513,597 US201013513597A US2012318474A1 US 20120318474 A1 US20120318474 A1 US 20120318474A1 US 201013513597 A US201013513597 A US 201013513597A US 2012318474 A1 US2012318474 A1 US 2012318474A1
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United States
Prior art keywords
hollow profile
ground circuit
collection pipe
pipe system
coiled
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Abandoned
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US13/513,597
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English (en)
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Mauri Antero Lieskoski
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0472—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0206—Heat exchangers immersed in a large body of liquid
    • F28D1/022—Heat exchangers immersed in a large body of liquid for immersion in a natural body of water, e.g. marine radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0472—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled
    • F28D1/0473—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being helically or spirally coiled the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Definitions

  • the invention relates to a ground circuit in a low-energy system in accordance with the preamble of claim 1 .
  • the invention also relates to a method for recovering energy in accordance with claim 16 .
  • a ground circuit and a method of this kind are utilized, in particular, in systems where energy—as well heat as cold—is transferred with a terminal device from ground, rock or water by the intermediary of a transfer fluid.
  • Said terminal device may be as well a heat pump as an air conditioning radiator.
  • the low-energy system refers to a system whose energy source has a low temperature, and most conventionally this temperature may be in the range of +2 to +10° C.
  • the energy content generated by an energy source such as ground, rock or water
  • the energy content generated by an energy source will be referred to as low energy.
  • Utilization of the low energy of ground, rock or water has generally referred to heating of a building or tap water by employing a heat pump or various heat collection circuits, for instance. There is conventionally obtained 2 to 4 units of heat per each electric energy unit used. In cold climate conditions the heating energy consumption for buildings is considerable, whereby the utilization of low-energy systems is becoming more and more economically viable as the costs of electricity and oil increase.
  • the present collection circuit and collection method may also be utilized in cooling indoor spaces.
  • a cool transfer fluid coming from a heat collection circuit is circulated, for instance, through cooling beams, cooling radiators or the like devices.
  • a commonly used manner to recover energy has been to place a collection circuit, i.e. so-called ground circuit, in a soil layer surrounding a building, where it is buried in a frost-free depth substantially horizontally.
  • a ground circuit of this kind requires a large surface area to obtain a sufficient efficiency, and consequently it can only be used on large plots of land.
  • Pipe loops in a ground circuit shall be at least 1.5 m apart from one another so that the adjacent loops would not interfere with the energy recovery of one another.
  • To place a horizontal pipe system in the ground requires that an extensive pipe trench system be dug throughout the length of the ground circuit, whereby the placement thereof in a finished courtyard area or park, for instance, is difficult without causing serious damage to the root systems of plants and trees.
  • a second manner to recover energy is to place a collection circuit in the bottom of a lake or another water body, whereby energy is transferred from the bottom sediment and water to a transfer fluid.
  • the collection circuit may be conveyed into water on land, but in that case an outgoing pipeline and a return pipeline should have separate, specific trenches.
  • the collection pipe system placed in water is easy to install in the bottom of the water body.
  • a liquid-filled pipe is lighter than the surrounding water, and consequently it tends to rise towards the surface. Irregularly risen portions of the collection pipe system may produce in the collection pipe system air pockets that hamper the circulation of the transfer fluid.
  • the collection pipe system should be anchored to the bottom of the water body.
  • the pipe system installed in the bottom of the water body is also more vulnerable to breakage than the one dug in the ground. For instance, an anchor of a boat or a similar device may get caught in the pipe system and break it. In the shore line the outgoing and incoming pipelines shall be buried sufficiently deep, so that the ice would not damage the pipe system in winter.
  • a third manner to recover energy is to construct a so-called heat well.
  • a special pipe system which constitutes a ground circuit, is buried in a deep, vertical hole drilled preferably in rock.
  • the heat well requires a very small surface area compared with a horizontal pipe system, and the amount of energy obtained therefrom is conventionally double compared with a collection circuit placed in a soil layer or in a water body. Energy yield is particularly good when the heat well is drilled in rock. It is common, however, that on top of the rock there is a significant layer of loose material, such as soil and/or rubble.
  • This portion containing loose material increases the cost of a heat well, because it must be furnished with a special protective pipe which prevents the well from collapsing.
  • energy yield from the loose material portion is poorer than from the rock portion, and consequently the well is to be made deeper, or there is to be made a plurality of wells side by side in the loose material.
  • the object of the present invention is to provide a ground circuit in a low-energy system, whereby the above-described problems could mainly be avoided.
  • a ground circuit in a low-energy system having the characteristics defined in the claims of the present invention.
  • the problems of a ground circuit in the present low-energy system may be solved by combining the characteristics in the manner as stated in the characterizing part of claim 1 .
  • the method for recovering energy in a ground circuit in a low-energy system in accordance with the invention is characterized by what is stated in the characterizing part of claim 16 .
  • the invention is based on the idea that the physical length a ground circuit takes in the environment may be substantially reduced by utilizing a coiled pipe in the structure of the ground circuit.
  • a hollow profile encircling an internal cavity formed by a pipe of this kind may provide up to a 50-metre long collection pipe system for one metre of pipe in longitudinal direction.
  • By arranging these coils nested one inside the other it is possible to further increase the total length of the collection pipe system.
  • Each coil being tubular in structure, there is provided a ground circuit solution that is easy to manufacture and reliable in operation.
  • the same kind of collection pipe system may be used individually or in groups, in a water body or buried in the ground, either in vertical drillings or horizontal diggings.
  • a multi-pipe collection pipe system consisting of nested coils is well suited for utilization, for instance, in the vicinity of flowing water such that the collection pipe system is connected at its opposite ends to vertical wells, into which a flow of the nearby water body is conveyed.
  • Maintenance of the collection pipe system that is located on dry land and has a closed outer surface becomes simpler, when it is possible to use vertical wells for servicing the exchanger, for instance, for washing with pressure washers.
  • the vertical wells enable flow rate control in the collection pipe system.
  • the collection pipe system of the invention By placing the collection pipe system of the invention such that a flow space formed therein is substantially vertical, it is possible to provide in the flow space a flow-through even in low-flow water. As the collection pipe system extracts energy from the surrounding water, this water mass cools down, which in turn results in natural water circulation as the cooled water starts moving towards the surface of the water body.
  • FIG. 1 shows known solutions for recovering energy
  • FIG. 2 is a schematic view of a coil constituting a collection pipe system
  • FIG. 3 is a schematic side view of the collection pipe system so as to illustrate its main structural components
  • FIG. 4 is a schematic cross-sectional view of a perforated collection pipe system formed by a single hollow profile and a flat bar connected thereto;
  • FIG. 5 is an end view of the collection pipe system of FIG. 4 ;
  • FIG. 6 is a schematic cross-sectional view of the pipe system formed by a single coiled double-walled pipe
  • FIG. 7 is an end view of the collection pipe system of FIG. 6 ;
  • FIG. 8 is a schematic cross-sectional view of the pipe system formed by two, separate, coiled, double-walled pipes;
  • FIG. 9 is an end view of the collection pipe system of FIG. 8 ;
  • FIG. 10 shows a collection pipe system provided with head and end wells, in which pipe system nested hollow profiles are interconnected with a fitting;
  • FIG. 11 shows a collection field formed by collection pipe systems arranged in juxtaposition
  • FIG. 12 shows a collection field formed by pipe systems arranged in series
  • FIG. 13 shows a collection pipe system surrounded by soil and arranged in a substantially vertical position
  • FIG. 14 is a cross-sectional view of an arrangement, in which nested coils of collection pipe system collect thermal energy from a water body, for instance a lake;
  • FIG. 15 is a top view of the arrangement of FIG. 14 ;
  • FIG. 16 is a cross-sectional view in accordance with FIG. 14 at point A-A in FIG. 15 .
  • FIG. 1 It is known per se to collect energy, for instance, for use in a heat pump by utilizing the solutions in accordance with FIG. 1 .
  • the figure shows two parallel systems, the first of which comprises a collection pipe system 2 arranged in a heat well 1 , which communicates with a heat pump 5 through connection and return pipelines 3 and 4 .
  • the heat pump communicates with a collection pipe system submerged in a nearby water body through second connection and return pipelines.
  • this kind of collection pipe system 2 of large physical dimensions is replaceable by a considerably more compact solution, in which a hollow profile 6 forming the collection pipe system is arranged, unlike before, to form a compact coil to be buried in the environment.
  • a schematic embodiment of this coil is shown in FIG. 2 .
  • the physical dimensions of the collection pipe system are affected by a radius r of the coil as well as the mutual distance between the adjacent coil rounds, i.e. the pitch P.
  • the coil may even be formed such that it contains 50 m of hollow profile per one metre of coil in longitudinal direction.
  • the cross-sectional shape and the width of the hollow profile are affected by the overall structure of the collection circuit, the coil radius and the mutual distance between the adjacent coil rounds.
  • the coil of FIG. 2 is applicable for use in a collection pipe system 2 , when a hollow profile 6 is allowed to form a coil that is of an open coil spring type as shown in FIG. 3 , in which a connection pipeline 3 joined to the collection pipe system simultaneously forms one of the bracing bars 7 of the coil.
  • the connection pipe is attached, for instance, by mechanical fasteners or by welding most preferably to several loops of the coil so as to prevent the coil from collapsing.
  • the coil may also comprise one or more other bracing bars 7 as shown in the figure.
  • the collection pipe system 2 of FIG. 3 operates such that the collection pipe system is installed in a water body or to be surrounded by soil, whereby the outer surface 8 of the hollow profile 6 of the collection pipe system comes substantially totally into contact with the surrounding, thermal energy containing material.
  • the thermal energy is transferred to the transfer fluid circulating in the coil substantially throughout the outer surface of the collection pipe system.
  • FIGS. 4 and 5 show a particular structural solution of an embodiment of the collection pipe system 2 of a ground circuit in the present low-energy system.
  • the collection pipe system consists of a coiled hollow profile 6 known per se, whereby said hollow profile is utilized in the circulation of transfer fluid.
  • the successive rounds of the hollow profile are separated from one another by a flat bar 9 arranged therebetween.
  • the hollow profile and the flat bar form a tubular structure as shown in FIG. 5 , which defines within its limits a cavity in this connection referred to as a flow space 11 .
  • the grooves may also be formed such that they are oriented towards this flow space by arranging the flat bar on the opposite edge of the hollow profile of FIG. 4 .
  • the flat bars 9 between the hollow profile 6 with perforations 12 it is possible to convey material into the flow space 11 of the collection pipe system 2 both through the opposite ends of the flow space and through the outer surface of the collection pipe system.
  • This feature may be utilized both when installing the collection pipe system to be surrounded by soil and when installing it to be surrounded by water. For instance, when filling the trench for the collection pipe system with sufficiently fine-grained filling material, the filling material runs more easily also into the flow space, which makes the contact surface larger between the collection pipe system and the material.
  • the collection pipe system provided with perforated flat bars is installed such that it is surrounded by water, the perforation enables freer flow of water through the structures of the collection pipe system.
  • the embodiments of the collection pipe system 2 in accordance with FIGS. 6 to 9 preferably consist of a coiled, double-walled pipe known per se.
  • This pipe in turn, consists of a hollow profile 6 and a cavity, i.e. a flow space 11 , provided therein.
  • one or more hollow profiles provided side by side may be arranged to encircle the flow space.
  • transfer fluid that is arranged to receive, the hollow profile being in contact with the source material surrounding it and/or locating or moving in the cavity, the thermal energy from this material.
  • the heat transfer fluid transfers this thermal energy through a return pipeline 4 to a heat exchanger 5 connected to the ground circuit so as to recover the thermal energy.
  • the heat transfer fluid may be conveyed into one or more of these hollow profiles.
  • the transfer fluid circulating in the double-walled pipe may be arranged to come into contact with the surrounding source material throughout its surface or just for a portion of its surface. In the former case transfer fluid is conveyed into each parallel hollow profile. In the latter case transfer fluid is conveyed into just one or some hollow profiles.
  • a variation of this coiled, double-walled pipe is provided, when the successive rounds in the above-mentioned hollow profile are separated from one another by two substantially juxtaposed flat bars such that both the inner surface and the outer surface are uniform.
  • the collection pipe system 2 may also consist of a plurality of nested, double-walled pipes, in particular for recovering larger amounts of thermal energy, in the manner illustrated in FIGS. 8 and 9 .
  • the collection pipe system is formed by at least two, coiled, double-walled pipes mounted substantially concentrically in relation to their longitudinal axis, whereby the collection pipe system will also be provided with several adjacent annular flow spaces—even though the flow space in the middle will be a tubular flow space having a small cross section.
  • the multi-tier collection pipe system of this kind is particularly well suited for use in a water body, and in particular in a water body that flows.
  • FIGS. 8 and 9 show a collection pipe system consisting of two nested, double-walled pipes, the number of interfitting pipes may even be higher.
  • the multi-tier collection pipe systems of this kind it has to be made sure that each adjacent flow space has a cross-sectional area that allows sufficient flow in order to optimize energy exchange between the source material and the heat transfer fluid.
  • the height of the flow space is 50 to 200 mm.
  • the collection pipe system 2 is made of a plurality of nested, double-walled pipes as shown in FIGS. 8 and 9 , it is advantageous to connect the hollow profiles 6 of each adjacent pipe to connection pipes with a particular inlet manifold 13 , through which the cooled transfer fluid may be fed from the connection pipe 3 to the hollow profile.
  • This inlet manifold equalizes the flow of the transfer fluid conveyed into the hollow profile, in particular in the embodiments comprising multiple, nested, hollow profile tiers, in order to enable as steady flow as possible in the collection pipe system.
  • said second end When heated transfer fluid arrives from a first end of the double-walled pipe to its second end, said second end likewise comprises an outlet manifold 14 for conveying the transfer fluid from the hollow profile into the return pipeline 4 and further to the heat exchanger 5 .
  • the flow of the transfer fluid in the hollow profiles may be particularly equalized or otherwise controlled by mounting specific valves in the feed and discharge blocks for equalizing the fluid flow.
  • the flow of the transfer fluid is also controllable by selecting the cross-sectional area of the hollow profiles of the nested pipes to be such that they differ slightly from one another, whereby the flows in adjacent and nested pipes are preferably fairly uniform.
  • the hollow profile 6 of the collection pipe system 2 in accordance with the above embodiments preferably has a cross section that is substantially square-shaped.
  • the shape of the profile is not restricted to this shape, but also other known cross-sectional shapes are possible, as long as they are suitable for the manufacture of helical collection pipe system.
  • Even though particularly the above-mentioned double-walled pipes are mainly manufactured of square-shaped plastic profile, also other materials, such as aluminium and steel, are well suited for the manufacture of collection pipe systems described herein.
  • the present collection pipe system 2 of a ground circuit in a low-energy system may be installed in a variety of ways to be surrounded by source material. So, the collection pipe system may be placed substantially horizontally in water, where water flows continuously therethrough, or in substantially vertical position in non-flowing water, whereby natural vertical flow resulting from the cooling of water will be provided in the flow space 11 of the collection pipe system.
  • the collection pipe system may also be installed upright in a so-called heat well, where it is surrounded by source material.
  • the collection pipe system may be further installed horizontally in a trenchlike dugout, where it is advantageously surrounded by fine-grained source material. It is particularly advantageous to use the collection pipe system in a groundwater basin, where water enhances heat exchange from the surrounding material into the heat transfer fluid circulating in the hollow profile 6 .
  • the water flushes both sides of the hollow profiles containing the heat transfer fluid thus enhancing significantly the transfer of thermal energy into the transfer fluid and thus further to a heat exchanger 5 or a cooling apparatus.
  • FIGS. 14 to 16 Particularly high efficiency of energy transfer is achieved, when the collection pipe system 2 forms a collector arrangement shown in FIGS. 14 to 16 and comprising nested, coiled pipes of different cross-sections, their number being two to twelve, preferably seven to nine.
  • FIGS. 14 to 16 For reasons of drawing technique, these figures only show six nested pipes and the flow space 11 surrounded thereby.
  • the pipes may be either double-walled or they may consist of coil loops separated by a flat bar, whereby the flat bar is advantageously perforated to provide improved flow-through.
  • the manufacturing material of the collector arrangement is preferably plastic, for instance HD-PE plastic, whereby all joints are produced by a welding method required by each particular application.
  • plastic material for instance HD-PE plastic, whereby all joints are produced by a welding method required by each particular application.
  • the advantages of plastic material include very long service life and a structure that is durable, strong and impermeable in use.
  • This collector arrangement is simple and fast to install anywhere in flowing water or in the vicinity thereof.
  • the connection and return pipelines 3 and 4 belonging to the collector arrangement are connectable by simple measures to a separate heat exchanger.
  • the total length of collector arrangement By selecting the total length of collector arrangement to be about 15 m in the embodiment as shown in FIGS. 14 to 16 there is provided a collection pipe system, in which the total surface area of the hollow profile 6 is up to 1,000 m 2 . It is advantageous to group the collection pipe system of the collector arrangement into two cellular series, as shown in the figures. It is found that by dividing the collector pipe system into two parts in this manner, it is possible to enhance the collection of thermal energy from the source material.
  • the efficiency of the collector arrangement of this type is found to be in the order of 700 kW, when water at the temperature of +4° C. is circulated therein.
  • the output heating capacity in accordance with the embodiment of this collector arrangement would be 1 MW, when utilized with a coefficient of performance 3 (COP-3).
  • COP-3 coefficient of performance 3
  • this heating capacity would be sufficient for about 100 standard-sized detached houses.
  • the collector arrangement itself would require about 10 kW of power, which is needed by the propeller pump for the flow motion of water.
  • one collector arrangement in accordance with FIGS. 14 to 16 corresponds to a good 70 rock heat wells that are 300 m deep, when the collector arrangement is subjected to continuous energy supply. Because the present collector arrangement is remarkably efficient, the cost of the ground circuit will be lower than before. When the present collector arrangement is utilized, the purchase and installation costs of the ground circuit are just one third of those of the previous solutions. The construction area required by the ground circuit is also significantly smaller when the above collector arrangement is compared with a bore well field.
  • the collector arrangement When the collector arrangement is made of plastic, a structure is provided that tolerates as well salinity as variations in temperature of ambient material better than before. Thus, the collector arrangement also has a longer service life than before.
  • the collector arrangement consisting of one or more coiled, multi-tier collection pipe system elements may also comprise at its first end a substantially vertical head pipe 22 as shown in FIG. 10 .
  • the main purpose of this head pipe is to protect the water-flow-encountering first ends of pipes, which form the collection pipe system 2 installed in a water body, from persistent erosion resulting from impurities in the water and from impacts caused by objects passing along the water.
  • the head pipe 22 also conveys the water flow at a steady pressure into at least one flow space 11 of the collection pipe system.
  • the water flow pressure prevailing in the collection pipe system 2 may be further equalized by arranging at the second end of the coiled pipes, opposite to the head pipe 22 , a substantially vertical end well 23 as illustrated in FIG. 10 .
  • the water discharged from the flow space 11 enters thus the end well, wherefrom it returns to a surrounding flow after a vertical transfer.
  • connection and return pipes 3 and 4 may be mounted safely on the anchoring slab 19 and be protected by the head pipe 22 and the end well 23 as shown schematically in FIG. 10 .
  • the solution provided by the present collection pipe system is particularly advantageous to install in condensing water flow of power plants or the like, in discharge flows of waste water treatment plants and in rivers or in other natural water flows, such as tidal areas.
  • a protective frame prevents foreign objects, such as logs, ice blocks and the like, from damaging the collection pipe system element.
  • the described collection pipe system element may also be utilized by installing it on dry land, close to a water body, such as described in FIG. 14 .
  • the head pipe 22 and the end well 23 may form vertical wells at the opposite ends of the collection pipe system element, when so desired.
  • the flow rate of water may be controlled in the collection pipe system by a pump 15 to be mounted on the head pipe or the collection pipe system in the above-described manner.
  • these vertical wells may be utilized for maintenance of the collection pipe system element, for instance, for washing it with pressure washers.
  • the ground circuit in a low-energy system as described here is utilized in the following manner.
  • the collection pipe system 2 comprised by the ground circuit is arranged in the above-described manner to form at least one coil, each coil having a substantially uniform cross section.
  • the transfer fluid in the ground circuit is passed along this coil, as shown in FIG. 3 , from a connection pipeline 3 at its first end to its second end and the second end of the coil is connected to a return pipeline 4 for conveying the transfer fluid flow further to be used, for instance, in a heat pump 5 of FIG. 1 .
  • the outer surface 8 of the collection pipe system 2 is arranged to come into contact with surrounding source material containing thermal energy such that the thermal energy is transferred to the transfer fluid circulating in the coil substantially throughout the outer surface of the collection pipe system.
  • both the outer surface of the pipe provided by the hollow profile and the inner side thereof may be arranged to be simultaneously in contact with the surrounding source material containing thermal energy.
  • the thermal energy is transferred to the transfer fluid circulating in the hollow profile both throughout the outer surface of the pipe and throughout the inner surface of the pipe.
  • the collection pipe system comprises a plurality of coils, the nested pipes form between them separate flow spaces, and the innermost pipe cavity forms a flow space, which flow spaces extend throughout the length of the collection pipe system. In this manner both the outer surface and the inner surface formed in each pipe by the hollow profile are arranged to be in contact with the surrounding source material containing thermal energy by conveying a fluid flow through the flow spaces of the collection pipe system.
  • Recovery of thermal energy may also be enhanced by arranging the ground circuit to comprise at least two collection pipe systems 2 in juxtaposeition, as shown in FIG. 11 .
  • the collection pipe system may comprise at least two successive collection pipe systems, as shown in FIG. 12 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Sewage (AREA)
US13/513,597 2009-12-04 2010-09-23 Ground circuit in a low-energy system Abandoned US20120318474A1 (en)

Applications Claiming Priority (3)

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FI20096291A FI20096291A0 (fi) 2009-12-04 2009-12-04 Maapiiri matalaenergiajärjestelmässä
FI20096291 2009-12-04
PCT/FI2010/050736 WO2011067457A1 (en) 2009-12-04 2010-09-23 Ground circuit in a low-energy system

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US15/187,171 Expired - Fee Related US10113772B2 (en) 2009-12-04 2016-06-20 Ground circuit in a low-energy system

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EP (1) EP2507565B1 (de)
JP (1) JP5913119B2 (de)
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US9518787B2 (en) 2012-11-01 2016-12-13 Skanska Svergie Ab Thermal energy storage system comprising a combined heating and cooling machine and a method for using the thermal energy storage system
US20170067692A1 (en) * 2014-03-04 2017-03-09 Uponor Infra Oy Heat exchanger for low temperatures
US9702574B2 (en) 2013-05-09 2017-07-11 Steven B. Haupt Ground water air conditioning systems and associated methods
US9823026B2 (en) 2012-11-01 2017-11-21 Skanska Sverige Ab Thermal energy storage with an expansion space
CN107702363A (zh) * 2017-10-18 2018-02-16 洛阳文森科技有限公司 一种多分体式地下保温水箱
US20180120031A1 (en) * 2015-05-06 2018-05-03 Koninklijke Philips N.V. Assembly comprising an object having a surface which is intended to be exposed to water and an anti-fouling protector arrangement
CN112857095A (zh) * 2021-01-19 2021-05-28 广东纽恩泰新能源科技发展有限公司 一种江、河、湖、海水源侧水水换热器
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ES1078916Y (es) * 2013-02-05 2013-06-28 Gregorio Jose Salido Sonda geotermica de intercambio térmico mediante movimiento de agua
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JP6273053B1 (ja) * 2017-01-17 2018-01-31 租 池田 採熱用管機構及びその製造方法、並びに空調装置

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US9823026B2 (en) 2012-11-01 2017-11-21 Skanska Sverige Ab Thermal energy storage with an expansion space
US9657998B2 (en) 2012-11-01 2017-05-23 Skanska Sverige Ab Method for operating an arrangement for storing thermal energy
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US9702574B2 (en) 2013-05-09 2017-07-11 Steven B. Haupt Ground water air conditioning systems and associated methods
US20170067692A1 (en) * 2014-03-04 2017-03-09 Uponor Infra Oy Heat exchanger for low temperatures
US20180120031A1 (en) * 2015-05-06 2018-05-03 Koninklijke Philips N.V. Assembly comprising an object having a surface which is intended to be exposed to water and an anti-fouling protector arrangement
US10816269B2 (en) * 2015-05-06 2020-10-27 Koninklijke Philips N.V. Assembly comprising an object having a surface which is intended to be exposed to water and an anti-fouling protector arrangement
CN107702363A (zh) * 2017-10-18 2018-02-16 洛阳文森科技有限公司 一种多分体式地下保温水箱
US11397061B2 (en) * 2018-04-17 2022-07-26 Kobe Steel, Ltd. Fluid flow-path device
US20220357111A1 (en) * 2019-07-05 2022-11-10 Envola GmbH Device for energy transfer and for energy storage in a liquid reservoir
US11774185B2 (en) * 2019-07-05 2023-10-03 Envola GmbH Device for energy transfer and for energy storage in a liquid reservoir
CN112857095A (zh) * 2021-01-19 2021-05-28 广东纽恩泰新能源科技发展有限公司 一种江、河、湖、海水源侧水水换热器

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CA2782771C (en) 2017-11-28
CN102695928A (zh) 2012-09-26
RU2561840C2 (ru) 2015-09-10
US10113772B2 (en) 2018-10-30
EP2507565A4 (de) 2015-03-04
JP2013513081A (ja) 2013-04-18
US20160290681A1 (en) 2016-10-06
NO2507565T3 (de) 2018-04-28
CN102695928B (zh) 2014-09-17
FI20096291A0 (fi) 2009-12-04
DK2507565T3 (en) 2018-02-05
JP5913119B2 (ja) 2016-04-27
WO2011067457A1 (en) 2011-06-09
EP2507565B1 (de) 2017-11-29
CA2782771A1 (en) 2011-06-09
EP2507565A1 (de) 2012-10-10
RU2012127167A (ru) 2014-01-10

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