JP2010223537A - Heat pump hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump hot water supply system capable of more efficiently exchanging heat, free from worry about running-out of hot water, and saving energy and a space. <P>SOLUTION: This heat pump hot water supply system includes a latent heat device 1 receiving a finned tube heat exchanger exchanging heat between a primary-side heat medium A and the water B in a tank filled with a latent-heat heat storage material, a heat pump unit 10 constituting a refrigerating cycle by successively connected with a pressure reducing means 11, a heat source machine-side heat exchanger 12 and a compressor 13 through primary-side heat medium piping 14, and supplying the primary-side heat medium A of high temperature to the latent heat device 1, a supply pipe 21 connected with the latent heat device 1 and supplying the water B of low temperature, and a hot water supply pipe 22 connected with the latent heat device 1 and supplying the water B having high temperature by the heat exchange in the latent heat device 1 to a use place. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply system using a latent heat device.

  A heat storage device conventionally used for hot water supply, for example, is provided with a heat exchanger in a heat storage tank filled with a heat storage material, and circulating water heated by a heat source is sent to the heat exchanger of the heat storage tank by a circulation pump to store heat in the heat storage material. To do. In the case of supplying hot water, hot water has been used by supplying water from a water absorption pipe, extracting heat from the heat storage material via a heat exchanger (performing heat exchange), and supplying hot water from the hot water supply pipe.

  For example, as disclosed in Patent Document 1 below, this heat storage device includes a heat storage panel having a primary-side fluid flow path and a flow path flat plate having a secondary-side fluid flow path, and sequentially sandwiching a heat storage body. The heat storage body, the heat storage panel, and the flow path flat plate are in close contact with each other.

  In addition, a heat storage type water heater is also proposed in which this heat storage device is applied to a heat pump hot water supply system, and hot water generated by heat exchange in the heat storage device is supplied to each place of use (see Patent Document 2). This heat storage type hot water heater adopts a configuration in which heat radiated by a heat exchanger for fluid heating of a heat pump is stored in a heat storage device through a medium such as a fluid to be heated such as water.

JP 2006-284046 A JP 2007-285640 A

  However, in the invention disclosed in Patent Document 1 described above, because of the configuration, a sufficient heat transfer area cannot be ensured between the heat storage body and the heat medium that is the primary fluid or the secondary fluid. . Therefore, it becomes difficult to perform efficient heat exchange. Moreover, although a thermal storage body solidifies sequentially from a thermal radiation part by radiating | discharging a latent heat, in the state which cannot ensure a heat-transfer area, a heat-transfer area becomes small gradually by solidification of a thermal storage body. For this reason, the performance of heat exchange between the heat media on the primary side and the secondary side is deteriorated.

  According to the configuration of the regenerative water heater in the invention disclosed in Patent Document 2, heat loss occurs during heat transfer from the fluid heating heat exchanger to the fluid to be heated, and heat transfer from the fluid to be heated to the heat storage device. It just happens and is useless. In addition, when circulating the heated fluid, a separate circulation pump must be installed and new energy is required, which is not appropriate from the viewpoint of energy saving. Furthermore, since the apparatus configuration becomes large, a large space is required for installing the regenerative water heater.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to enable more efficient heat exchange than ever, eliminate the risk of running out of hot water, and save energy and space. It is to provide a heat pump hot water supply system that contributes to the future.

  A feature of an embodiment of the present invention is that in a heat pump hot water supply system, a latent heat device in which a finned tube heat exchanger that performs heat exchange between a primary heat medium and water is stored in a tank filled with a latent heat storage material. And a heat pump unit that constitutes a refrigeration cycle by sequentially connecting the decompression means, the heat source side heat exchanger, the compressor and the primary side heat medium pipe, and supplies a high temperature primary side heat medium to the latent heat device; A supply pipe that is connected to the latent heat device and supplies low-temperature water; and a hot water supply pipe that is connected to the latent heat device and supplies water that has become hot due to heat exchange in the latent heat device.

  According to the present invention, it is possible to provide a heat pump hot water supply system that enables more efficient heat exchange than ever before, eliminates the danger of running out of hot water, and contributes to energy saving and space saving.

1 is an overall view showing an overall configuration of a heat pump hot water supply system according to an embodiment of the present invention. It is the block diagram which showed the structure of the latent heat apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall view showing an overall configuration of a heat pump hot water supply system S according to an embodiment of the present invention. The heat pump hot water supply system S includes a latent heat device 1, a heat pump unit 10 that supplies heat stored in the latent heat device 1, a supply pipe 21 that supplies water to the latent heat device 1, and heat exchange in the latent heat device 1. The hot water supply pipe 22 is configured to supply the generated hot water to each use place.

  FIG. 2 is a configuration diagram showing the configuration of the latent heat device 1 according to the embodiment of the present invention. In FIG. 2, it represents so that the inside of the latent heat apparatus 1 can be seen. The latent heat device 1 includes a first flow path 2 through which the primary heat medium A supplied from the heat pump unit 10 passes, and a second flow path through which water as the secondary heat medium B supplied from the supply pipe 21 passes. 3. The first flow path 2 and the second flow path 3 are accommodated in the tank 4. Further, the tank 4 is filled with a latent heat storage material 5.

  The first flow path 2 is made of copper or an aluminum pipe, and is configured such that a plurality of straight portions 2a and both ends of the straight portions 2a adjacent to each other are connected by a curved portion 2b and stacked in layers. By adopting such a configuration, the primary-side heat medium A supplied from the heat pump unit 10 to the latent heat device 1 is sent to the first flow path 2 and continuously flows in one direction, and again the heat pump. It is sent out to the unit 10. In that sense, the first flow path 2 serves as a heat radiation side heat exchanger in the latent heat device 1.

  On the other hand, similarly to the first flow path 2, the second flow path 3 is configured such that a plurality of straight line portions 3a and both end portions of the adjacent straight line portions 3a are connected by the curved line portions 3b and stacked in layers. . As a result, the secondary heat medium B is sent from the supply pipe 21 to the second flow path 3, flows continuously in one direction, and is sent out to the hot water supply pipe 22. In that sense, the second flow path 3 plays a role as a heat absorption side heat exchanger in the latent heat device 1.

  The straight portions 2a and 3a constituting the first flow path 2 and the second flow path 3 pass through the fins 6 made of laminated aluminum thin plates. For this reason, it is a multi-row finned tube heat exchanger similar to an air heat exchanger used as a general air conditioning evaporator or condenser. Accordingly, it is possible to divert the air conditioner parts or the manufacturing apparatus thereof.

  In the embodiment of the present invention, as the primary heat medium A, for example, a refrigerant such as R410 and CO2 is preferably used. The water that is the secondary side heat medium B supplied from the supply pipe 21 to the latent heat device 1 is heated by the heat exchange with the primary side heat medium A in the latent heat device 1 to become hot water. The generated hot water is supplied to each place of use via a hot water supply pipe 22. A pump 23 is used for transporting the secondary heat medium B.

  The straight portions 2 a and 3 a in the first flow path 2 and the second flow path 3 are fitted vertically through the laminated fins 6. Accordingly, the first flow path 2 and the second flow path 3 are so-called finned tube type flow paths. A plurality of the fins 6 are arranged over the entire area of the straight portions 2a and 3a excluding the curved portions 2b and 3b. In the latent heat device 1 shown in FIG. 2, the fins 6 at the center of the straight portions 2 a and 3 a are omitted in the drawing in order to clarify the configurations of the first flow path 2 and the second flow path 3. Represents.

  The fin 6 efficiently moves the heat of the primary side heat medium A flowing in the first flow path 2 to the latent heat storage material 5, and the primary side heat medium A and the secondary side heat medium B pass through the fins. Heat transfer is efficiently performed by the heat conduction. In the embodiment of the present invention, all the layers of the first flow path 2 and the second flow path 3 stacked in the tank 4 pass through one fin 6 respectively. Further, by arranging the linear portions 2a and 3a over the entire area, the heat of the primary side heat medium A moves not only around the first flow path 2 but also in the latent heat device 1 without temperature unevenness. It becomes possible to make it. Accordingly, the material of the fin 6 is selected from a material such as thin aluminum plate that is excellent in heat conduction.

  The latent heat storage material 5 in the tank 4 of the latent heat apparatus 1 becomes a liquid at a predetermined temperature or higher (by absorbing heat) and changes to a solid at a temperature lower than the predetermined temperature (by releasing heat), and the phase changes due to latent heat. It is a substance. The entire finned tube heat exchanger through which the primary heat medium A and the secondary heat medium B pass is submerged in the latent heat storage material 5. The latent heat storage material 5 is filled in the tank 4 of the latent heat device 1 with a larger amount of heat storage than the sensible heat storage material 5 such as water. Therefore, when storing the same amount of heat, the tank 4 and thus the entire latent heat device 1 can be made smaller. Accordingly, the entire heat pump hot water supply system 1 can be reduced in size, which contributes to space saving. In addition, although water can be used as a latent heat storage material in the low temperature side heat storage of 0 degrees C or less, it cannot be used as a latent heat storage material in the high temperature side for hot water supply.

  As the latent heat storage material 5, for example, sodium acetate, barium hydroxide, or the like can be suitably used. In the case of sodium acetate, the melting point (predetermined temperature) is 58 ° C., and in the case of barium hydroxide, the melting point (predetermined temperature) is 78 ° C. The latent heat storage material 5 is filled in the latent heat device 1 as shown in FIG. Accordingly, the first flow path 2, the second flow path 3, and the fin 6 are in a state of being immersed in the liquid 4 latent heat storage material 5 in the housing 4 (latent heat device 1).

  The heat pump unit 10 includes a decompression unit 11 that lowers the pressure of the primary-side heat medium A sent from the latent heat device 1 and one end on the discharge side of the decompression unit 11 as shown by being surrounded by a broken line in FIG. Are connected to each other, the heat source machine side heat exchanger 12 including the blower 12a, the compressor 13 connected to the other end of the heat source machine side heat exchanger 12, and the primary side heat medium pipe 14 that connects these devices. Composed. Thereby, the compressor 13, the latent heat device 1, the decompression means 11, the heat source device side heat exchanger 12, and the compressor 13 are connected, and a refrigeration cycle in which the primary heat medium A circulates is configured.

  Here, the refrigeration cycle when supplying heat to the latent heat device 1 to store the heat will be briefly described. As shown by the solid arrow, first, in the primary heat medium pipe 14, the primary heat medium A, which is a gas, is pressurized in the compressor 13 to be high temperature and high pressure, and is supplied to the latent heat device 1. The In the latent heat device 1, the primary heat medium A passes through the first flow path 2 to move heat to the latent heat storage material 5. As described above, the fin 6 is fitted in the first flow path 2 so that heat can be transferred with high efficiency. The latent heat storage material 5 becomes a liquid by the high-temperature primary side heat medium A exceeding its melting point.

  The primary-side heat medium A that has transferred heat to the latent heat device 1 (latent heat storage material 5) is converted into a low-temperature and low-pressure liquid by the decompression means 11. Furthermore, it enters into the heat source machine side heat exchanger 12 and heat-exchanges with the atmosphere etc., absorbs heat, evaporates, becomes gas again, and returns to the compressor 13. By repeating such a refrigeration cycle, the latent heat device 1 stores heat.

  In the embodiment of the present invention, the supply path (primary side heat medium pipe 14) of the primary side heat medium A from the compressor 13 to the latent heat device 1 is divided into two flow paths as shown in FIG. 1 or FIG. Each is branched and connected so that the primary heat medium A is supplied to the finned tube heat exchanger in parallel. This is because when the first flow path 2 in the finned-tube heat exchanger in the latent heat device 1 is connected in parallel rather than connected in series, the heat transfer by the primary heat medium A to the latent heat storage material 5 This is because accumulation is performed with high efficiency. In the finned tube heat exchanger according to the embodiment of the present invention, two first flow paths 2 are provided in parallel as shown in FIG. 2, but the first flow paths are provided in parallel. The number of 2 can be set arbitrarily.

  When the high-temperature primary heat medium A is supplied to the latent heat device 1, heat moves to the latent heat storage material 5 through the first flow path 2 and the fins 6. When the pump 23 is driven in such a latent heat device 1, water as the secondary heat medium B is supplied from the supply pipe 21, and the secondary heat medium B is warmed by passing through the second flow path 3, Hot water is produced. In the latent heat apparatus 1, the 2nd flow path 3 is connected in series within the finned-tube heat exchanger. This is for efficiently transferring the heat accumulated in the latent heat storage material 5 to the secondary heat medium B (water) without waste. Further, if the secondary side heat medium B (water) is allowed to flow during operation of the refrigeration cycle, the primary side heat medium A and the secondary side heat medium B (water) can be directly heat-exchanged via the fins 6. And the hot water supplied and produced | generated in the latent heat apparatus 1 via the supply pipe | tube 21 is supplied to each use place via the hot water supply pipe | tube 22. FIG.

  By adopting the configuration described above, it is possible to provide a heat pump hot water supply system that enables more efficient heat exchange than ever, eliminates the danger of running out of hot water, and saves energy and saves space. .

  In particular, the latent heat device 1 includes a plurality of first flow paths 2 provided in parallel, a second flow path 3 connected in series, and fins 6 provided in the first flow path 2 and the second flow path 3. Therefore, highly efficient heat exchange can be performed. Further, by supplying a necessary amount of water into the latent heat apparatus 1 in a stored state when necessary, hot water having a desired amount and temperature can be always obtained, so there is no fear of running out of hot water.

  In addition, since the heat pump unit 10 is stored and operated in the latent heat device 1 in the midnight hours when the electricity rate is low, the need for operating the heat pump unit 10 during the daytime when there is a large demand for hot water is reduced. Energy saving and low cost heat pump hot water supply system. And the heat storage operation to the latent heat apparatus 1 and the hot water supply operation to each use place can perform a further highly efficient operation by shifting the operation timing. That is, the water supplied to the latent heat device 1 can be sufficiently warmed by performing the hot water supply operation after the heat storage operation is completed and the latent heat storage material 5 is sufficiently stored.

  Furthermore, if it is the structure of the heat pump hot water supply system demonstrated as an example in embodiment of this invention, since the hot water storage tank which is connected to a heat pump unit and stores hot water becomes unnecessary, the space-saving at the time of installation can also be aimed at. it can.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, although the example which connected the 1st flow path in parallel and the 2nd flow path was given and demonstrated, all can be connected in parallel and series according to conditions.

  Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... Latent heat apparatus, 2 ... 1st flow path, 3 ... 2nd flow path, 4 ... Tank, 5 ... Latent heat storage material, 6 ... Fin, 10 ... Heat pump unit, 11 ... Decompression means, 12 ... Heat source side heat Exchanger, 12a ... blower, 13 ... compressor, 14 ... primary side heat medium pipe, 21 ... supply pipe, 22 ... hot water supply pipe, 23 ... pump, A ... primary side heat medium, B ... secondary side heat medium, S ... Heat pump hot water supply system

Claims (3)

A latent heat device that houses a finned tube heat exchanger that performs heat exchange between the primary heat medium and water in a tank filled with the latent heat storage material;
A heat pump unit configured to form a refrigeration cycle by being sequentially connected via a decompression means, a heat source side heat exchanger, a compressor and a primary side heat medium pipe, and supplying the high temperature primary side heat medium to the latent heat device; ,
A supply pipe connected to the latent heat device for supplying low temperature water;
A hot water supply pipe connected to the latent heat device, for supplying water to the place of use, which has become hot due to heat exchange in the latent heat device;
A heat pump hot water supply system characterized by comprising: The find tube heat exchanger is
A first flow path in which the primary side heat medium flows continuously in one direction by connecting both ends of the linear portion adjacent to the plurality of linear portions by a curved portion;
A second flow path in which the water continuously flows in one direction by connecting both ends of the linear portion adjacent to a plurality of linear portions by a curved portion;
The heat pump hot water supply system according to claim 1, further comprising: a fin through which the straight portion passes in the first flow path and the second flow path.   The first flow path is connected in parallel in the finned tube heat exchanger, and the second flow path is connected in series in the finned tube heat exchanger. The heat pump hot water supply system according to claim 1 or 2.

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