FR2501836A1 - INTEGRATED HEAT PUMP AND HEAT ACCUMULATION SYSTEM - Google Patents

Abstract

THE INVENTION RELATES TO AN INTEGRATED HEAT PUMP AND HEAT ACCUMULATION SYSTEM. IN THIS SYSTEM, SETS OF REGISTERS 30 AND 32 CONTROL THE POSSIBLE PASSAGE THROUGH HEAT ACCUMULATOR 16 OF THE AIR COMING THROUGH DUCT 12 TO HEAT PUMP 10 AND LEAVING THROUGH DUCT 14. THE HEAT ACCUMULATOR 10 MAY INCLUDE PHASE CHANGING MATERIALS.

Description

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  - 1 - Integrated heat pump and storage system

heat.

  The invention generally relates to heating apparatus and, more particularly, to heating apparatus using heat pumps. The use of heat pumps for air heating is well known. A conventional type of heat pump, the air-to-air heat pump, normally draws heat from the air outside an enclosure and uses it to raise the temperature of the air inside. of the enclosure. It is understood that the operating coefficient and therefore the efficiency of the heat pump are a positive function of the temperature of the heat-supply medium, that is to say of the air

outside.

  The use of phase change materials as a heat storage medium has been proposed in the literature. An example of a heat storage system using phase change materials is described in an Israeli patent application in the name of

of the Applicant.

  The aim of the invention is to provide an integrated heat pump and heat storage system advantageously using phase change materials as a heat storage medium in combination with a heat pump which can be operated in a heat pump.

  conditions of relatively high efficiency.

  Thus, according to one aspect of the invention, there is provided an integrated heat pump and heat accumulation system comprising a heat pump, a first conduit serving to supply return air from an enclosure to the pump. a second conduit for supplying return air from the heat pump to the enclosure, a heat storage device, a first damper designed such that, in a

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  In the first orientation, it allows return air from the enclosure to enter the first conduit and prevents return air from passing through the heat storage apparatus and, in a second orientation, it passes the return air through the heat storage device to be heated by it before entering the first conduit, a second register designed so that in a first orientation he is passing heated air

  from the second conduit through the accumulator

  heat to give away some of its heat for accumulation and that in a second orientation it prevents the heated air from the second conduit from passing through the heat storage apparatus and allows heated air coming from the second duct

to reach the enclosure.

  Furthermore, an embodiment of the invention is characterized in that the first register is designed such that in its second orientation it prevents the return air from entering directly into the first conduit and that the second register is designed so that, in its first orientation, it prevents the heated air coming from the second conduit from arriving directly to the enclosure without first passing through

  the heat storage device.

  In addition, in one form of implementation, the heat storage apparatus comprises materials

phase change.

  It will be more clearly understood the invention through

  the detailed description below, considered in parallel

  to the accompanying drawings, in which: Figure 1 is a schematic representation of an integrated heat pump and heat accumulation system constructed and operable according to one embodiment of the invention, the registers being in

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  Fig. 2 is a schematic representation of the integrated heat pump and heat accumulation system of Fig. 1, the registers being in their respective second orientation; Fig. 3 is a schematic representation of a system of heat accumulation using materials

  phase change and useful in the invention.

  The invention will now be described in detail with reference to FIGS. 1 and 2 which illustrate the invention, the registers being in their respective first and second orientations, respectively

  in operation during the day and during the night.

  As shown in FIGS. 1 and 2, the apparatus of the invention comprises a heat pump 10, in this case of the air-air type. It is understood that, according to a variant of the invention, other types of heat exchangers can be used. A typical heat pump useful in the invention is the ERU or EHN model manufactured by Blectra (Israel) Ltd. The heat pump 10 communicates with the outside atmosphere by air circulation ducts which are not shown here for simplicity and clarity. A first conduit 12 supplies the heat pump 10 with return air from an enclosure and a second conduit 14 brings heated air from the heat pump 10 to the enclosure. 16 is provided for selectively communicating with the first and second conduits and with the currents

  of air going to and from the enclosure.

  The heat storage apparatus 16 may be any suitable apparatus. According to a preferred embodiment of the invention, the heat storage apparatus comprises a phase change material such as calcium chloride hexahydrate, with

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  Suitable additives improve its service life and its characteristics. A heat storage apparatus of this type is described in the publication uHeat Transfer Properties of a Heat-of-Fusion Store based on CaCi2 6H20 ", by R. Carlson and G. Wettermark, Solar Energy, Volume 24,

pp. 239 to 247 (1979).

  An appropriate heat storage facility may comprise multiple modular elements of the type shown in FIG. 3. Each modular element comprises multiple elements that contain a phase change material, typically calcium chloride hexahydrate. The elements are arranged parallel to the inside of an envelope 22 and are spaced from each other along at least a portion of their surface, so that air flow channels 24 are defined along it, so

  to allow a flow of heat exchange air.

  Selective communication between the air flows to and from the heat pump and the enclosure is provided by first and second register assemblies 30 and 32. The first register assembly 30 includes a first and a second flap or wing forming valves 34 and 36. The fin 34 controls the return air inlet from the enclosure and determines whether it goes directly to the heat pump through the first conduit or it passes first through the heat storage device 16. The fin 36 controls the communication between the heat storage device

16 and the first leads.

  The second register assembly comprises third and fourth fins 38 and 40. The third fin 38 controls the supply of heated air from the heat pump through the second conduit 14 and determines whether it goes directly to the the first vane 40 controls the communication between the heat storage device 16 and the enclosure,

for the influx of air to the enclosure.

  Reference will now be made particularly to FIG. 1, which shows the first and second register assemblies arranged in their respective first orientation for daytime operation. In this arrangement, the heat pump 10 operates at a high coefficient and therefore at a high efficiency and thus can produce more heat economically than is currently required in the enclosure. Heat buildup is expected. The heat accumulation is carried out by channeling the heated air from the heat pump, through the second conduit 14 and the third fin 38, to the heat storage apparatus. The heated air gives up some of its heat in the middle of heat accumulation for it to accumulate, then goes to the enclosure through

the fin 40.

  In this arrangement, the return air is brought directly from the enclosure through the first fin 34 and the second fin 36, which isolates the apparatus

  of heat accumulation 16 of the return air stream.

  In the arrangement represented by FIG. 1 and described above, it will be considered that each of the fins

  34, 36, 38 and 40 is in its first orientation.

  Referring now to FIG. 2, which shows the first and second register assemblies in their respective second orientation for overnight operation. In this arrangement, when the heat pump is operating at a relatively low coefficient and when it is possible that it can not provide all the necessary heat in the enclosure, the use of accumulated heat is provided. The accumulated heat is obtained by channeling the return air coming from

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  - 6 the enclosure to make it pass through the accumulation device

  heat 16, so as to collect accumulated heat.

  As shown in FIG. 2, the return air from the enclosure is fed to the heat storage apparatus 16 through the fin 34 and the air passing through the storage accumulator. heat 16 and thus heated is thus passed through the fin 36 to the heat pump, through the first conduit 12. The heated air leaving the heat pump 10 is brought directly to the enclosure by the second led 14 and the fins 38 and 40 which isolate the accumulation apparatus

  heat of the heated air stream.

  It is understood that the stored heat provided by the heat storage apparatus 16 can be used to reduce the necessary operation of the heat pump under low efficiency conditions and that this may decrease the need for additional heat.

  provided, for example, by electric or other sources.

  This can result in a significant economic benefit.

  Those skilled in the art will understand that the invention is not

  limited to what is particularly represented and described.

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Claims (3)

  1.- integrated heat pump and heat storage system, characterized in that it comprises a heat pump (10), a first duct (12) for supplying return air of a heat pump enclosure, a second conduit (14) for supplying a return flow of the heat pump to the enclosure, a heat storage apparatus (16), a first register (30) , 34, 36) designed in such a way that, in a first orientation, it allows return air from the enclosure to enter the first conduit (12) and prevents return air from passing through the heat storage apparatus (16) and, in a second orientation, forcing return air through the heat storage apparatus (16) to be heated by it prior to enter into the first conduit (12), a second register (32, 38, 40) designed such that, in a first orientation, it passes heated air from the other xth duct (14) through the heat storage apparatus (16) to yield some of its heat for accumulation and that in a second orientation it prevents heated air from the second duct ( 14) to pass through the heat storage apparatus (16) and allow heated air from the second duct to reach the enclosure.   2.- System according to claim 1, characterized in that the first register (30, 34, 36) is designed so that, in its second orientation, it prevents the return air from entering directly into the first conduit (12) and that the second register (32, 38, 40) is designed such that, in its first orientation, it prevents heated air from the second conduit (14) from reaching the enclosure directly without first go through the device 250 1836 heat storage (16).   3.- System according to one of claims 1 and 2,   characterized by the fact that the accumulation apparatus   of heat comprises phase change materials.