JP2015034671A - Heat exchanger for heat pump type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an accommodation space for a refrigerant heat exchanger to enable reduction in the size of the device, and reduce the number of man hours of the device having required heat exchange capacity in the heat exchanger for a heat pump type water heater.SOLUTION: A water refrigerant heat exchanger 13 is constituted by interconnecting a plurality of water refrigerant heat exchanger units 13-1 to 13-3 corresponding to required heat exchange capacity in parallel with each other. A refrigerant circuit includes a refrigerant heat exchanger 17 for exchanging heat between a refrigerant supplied to a compressor 12 with a refrigerant flowing out from the water refrigerant heat exchanger 13. The refrigerant heat exchanger 17 comprises refrigerant heat exchangers 17-1, 17-2 interconnected in series. While the refrigerant heat exchangers 17-1, 17-2 are inserted into cylindrical inner spaces of the water refrigerant heat exchanger units 13-1, 13-2, respectively, the water refrigerant heat exchanger 13 and the refrigerant heat exchanger 17 are assembled integrally.

Description

  The present invention relates to a heat exchanger of a heat pump type hot water heater using a high-temperature and high-pressure refrigerant (CO2 refrigerant) as a heat source.

  A heat pump type hot water heater using a refrigerant as a heat source heats water by exchanging heat with a high-temperature and high-pressure refrigerant in a water-refrigerant heat exchanger, and in order to obtain hot water supply, a refrigerant supplied to the compressor, A refrigerant heat exchanger that exchanges heat with the refrigerant flowing out of the water refrigerant heat exchanger is provided in the refrigerant circuit. This preheats the refrigerant supplied to the compressor with the latent heat in the refrigerant that has passed through the water refrigerant heat exchanger, and raises the temperature of the hot water supply temperature by raising the temperature of the refrigerant flowing into the water refrigerant heat exchanger. Is.

  FIG. 6 shows the configuration of such a heat pump type hot water heater. As shown in the drawing, the heat pump type hot water heater is configured as a whole by connecting an outdoor unit 10 including a refrigerant circuit 11 in which a CO2 refrigerant circulates and a hot water storage unit 20 including a hot water storage tank 21. In the refrigerant circuit 11, a compressor 12, a water refrigerant heat exchanger 13 as a condenser, an expansion valve 14, and a refrigerant air heat exchanger 15 as an evaporator are annularly piped, and the refrigerant supplied to the compressor 12; A refrigerant heat exchanger 17 for exchanging heat with the refrigerant flowing out of the water refrigerant heat exchanger 13 is provided.

  A pump 23 is provided in a circulation path 22 through which circulating water flows between the hot water storage tank 21 and the water refrigerant heat exchanger 12, and hot water heated by the water refrigerant heat exchanger 12 is stored in the hot water storage tank 21. A hot water supply pipe 24 is piped at the upper part of the hot water storage tank 21, and hot water is discharged by opening / closing the hot water tap 25 such as a bath or kitchen. .

  In Patent Document 1, in order to reduce the storage space of the refrigerant heat exchanger 17 and to reduce the size of the device, the water refrigerant heat exchanger 13 is formed in a cylindrical shape, and the columnar space is formed in the in-cylinder space. There is disclosed a heat exchanger for a heat pump type hot water heater in which the formed refrigerant heat exchanger 17 is inserted and the water refrigerant heat exchanger 13 and the refrigerant heat exchanger 17 are assembled together.

  By the way, when changing the heat exchange capacity of the water refrigerant heat exchanger 13 in response to market needs, the water refrigerant heat exchanger 13 having a size corresponding to the capacity is manufactured, and refrigerant heat exchange is performed according to the in-cylinder space. The vessel 17 was manufactured and inserted into the in-cylinder space of the water / refrigerant heat exchanger 13.

JP 2011-21868 A

  However, if the water-refrigerant heat exchanger 13 having a size corresponding to the heat exchange capacity is manufactured and the refrigerant heat exchanger 17 is manufactured in accordance with the in-cylinder space, there is a problem that the number of processes is large.

  In view of the above, an object of the present invention is to reduce the housing space of the refrigerant heat exchanger, thereby enabling downsizing of the device and reducing the number of man-hours of the device having the required heat exchange capability.

  The present invention is a heat exchanger of a heat pump water heater that heats water by exchanging heat with a high-temperature and high-pressure refrigerant in a water refrigerant heat exchanger, and the water refrigerant heat exchanger has a required heat exchange capacity. A plurality of water refrigerant heat exchanger units connected in parallel, and a refrigerant heat exchanger that exchanges heat between the refrigerant supplied to the compressor and the refrigerant flowing out of the plurality of water refrigerant heat exchanger units. Provided in the refrigerant circuit, the plurality of water refrigerant heat exchanger units are formed in a cylindrical shape, and a columnar shape is formed in an in-cylinder space of at least one water refrigerant heat exchanger unit among the plurality of water refrigerant heat exchanger units. The water refrigerant heat exchanger and the refrigerant heat exchanger are assembled together, with the refrigerant heat exchanger formed in the above-described state being inserted.

  The heat exchanger of the heat pump type water heater according to the present invention is a refrigerant heat exchanger in which a water refrigerant heat exchanger is composed of a plurality of water refrigerant heat exchanger units, and is formed in a columnar shape in an in-cylinder space of at least one unit. Since the housing space of the refrigerant heat exchanger is reduced and the equipment can be reduced in size, it is possible to reduce the man-hours of the equipment having the required heat exchange capability. it can.

  Further, the refrigerant heat exchanger is also constituted by a plurality of refrigerant heat exchanger units, and one refrigerant heat exchanger unit is inserted into the in-cylinder space of each of the plurality of water refrigerant heat exchanger units. Reduction can be achieved.

It is a front view of the state which notched a part and permeate | transmitted the inside of a cylinder with the heat exchanger in embodiment of this invention. It is a left view of FIG. It is a top view of FIG. It is a top view of the refrigerant heat exchanger of the embodiment of the present invention. FIG. 5 is a front view of FIG. 4. It is a block diagram of a heat pump type water heater.

  Below, the heat exchanger in embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG. The heat exchanger in the embodiment of the present invention is a heat pump type in which the refrigerant circuit 11 is provided with a refrigerant heat exchanger 17 for exchanging heat between the refrigerant supplied to the compressor 12 and the refrigerant flowing out of the water refrigerant heat exchanger 13. It is a heat exchanger of a water heater.

  As shown in the figure, the water-refrigerant heat exchanger 13 has three water-refrigerant heat exchanger units 13-1, 13-2, and 13-3 having the same configuration arranged in the horizontal direction in this embodiment. These are connected in parallel. Each refrigerant heat exchanger unit 13-1, 13-2, 13-3 is formed into a helical coil shape by forming a narrow tube 131 through which high-temperature and high-pressure refrigerant flows and a thick tube 132 through which water as a fluid to be heated flows. These two coil tubes are alternately arranged and abutted against each other to form a cylindrical shape.

  The inlet 131a of the thin tube 131 of each water refrigerant heat exchanger unit 13-1, 13-2, 13-3 is connected in common to the refrigerant inlet header 133a, and each water refrigerant heat exchanger unit 13-1, 13-2, The outlet 131b of the thin tube 131 of 13-3 is commonly connected to the refrigerant outlet header 133b. The refrigerant inlet header 133a is a tubular body, and is horizontally disposed adjacent to the upper side surfaces of the water-refrigerant heat exchanger units 13-1, 13-2, and 13-3. The refrigerant outlet header 133b is a tubular body and is disposed horizontally adjacent to the lower side surfaces of the water refrigerant heat exchanger units 13-1, 13-2, and 13-3.

  In addition, the inlet 132a of the thick pipe 132 of each water refrigerant heat exchanger unit is commonly connected to the water inlet header 134a, and the outlet of the thick pipe 132 of each water refrigerant heat exchanger unit is commonly connected to the water outlet header 134b. The The water inlet header 134a is a tubular body and is disposed horizontally below the water refrigerant heat exchanger units 13-1, 13-2, and 13-3. The water outlet header 134b is a tubular body and is disposed horizontally above the water refrigerant heat exchanger units 13-1, 13-2, and 13-3.

  The refrigerant flows from the inlet of the refrigerant inlet header 133a into the narrow tube 131 through the inlet 131a of the narrow tube 131 of each water refrigerant heat exchanger unit 13-1, 13-2, 13-3, and through the outlet 131b of the narrow tube 131. To the outlet of the refrigerant outlet header 133b. On the other hand, water flows from the inlet of the water inlet header 134a into the thick pipe 132 via the inlet 132a of the thick pipe 132 of each water refrigerant heat exchanger unit 13-1, 13-2, 13-3. Water flows through the outlet 132b of the pipe 132 to the outlet (hot water outlet) of the water outlet header 134b so as to cross the high-temperature and high-pressure refrigerant so that the water is heated by the high-temperature and high-pressure refrigerant.

  In this embodiment, the refrigerant heat exchanger 17 is formed by connecting two refrigerant heat exchanger units 17-1 and 17-2 in series with each other via a connecting fitting 173. Each refrigerant heat exchanger unit 17-1, 17-2 has a thick tube 171 through which the low-pressure refrigerant supplied to the compressor 12 circulates and a narrow tube 172 through which the high-pressure refrigerant flowing out of the water refrigerant heat exchanger 13 circulates. It is formed into a serpentine serpentine shape and abutted with each other to form a cylindrical shape, that is, a columnar shape, and its outer diameter is larger than the inner diameter of each water refrigerant heat exchanger unit 13-1, 13-2, 13-3. It is formed small.

  The low-pressure refrigerant flows from the inlet 171a to the outlet 171b, while the high-pressure refrigerant flows from the inlet 172a to the outlet 172b across the low-pressure refrigerant, and the low-pressure refrigerant supplied to the compressor 12 is preheated.

  Refrigerant heat exchanger units 17-1 and 17-2 are respectively inserted into the in-cylinder spaces of the water refrigerant heat exchanger units 13-1 and 13-2, and the water refrigerant heat exchanger unit 13-1 is inserted by the fixing bracket 135. , 13-2, the water refrigerant heat exchanger 13 and the refrigerant heat exchanger 17 are assembled and formed in a housing in which both heat exchangers are integrated. This heat exchanger is incorporated in the outdoor unit 10, and the inlets and outlets of the respective fluids are connected and piped to the refrigerant circuit 11.

  The refrigerant heat exchanger units 17-1 and 12-2 spirally include a tube body 171 through which low-pressure refrigerant supplied to the compressor 12 circulates and a thin tube 172 through which high-pressure refrigerant flowing out of the water refrigerant heat exchanger 13 circulates. It may be formed into a coil shape, and the two coil tubes may be alternately arranged and brought into contact with each other and laminated to form a cylindrical shape. Similarly to the previous example, the refrigerant heat exchanger units 17-1 and 17-2 are inserted into the in-cylinder spaces of the water refrigerant heat exchanger units 13-1 and 13-2, respectively. The water-refrigerant heat exchanger 13 and the refrigerant heat exchanger 17 are assembled by being fixed to the heat exchanger units 13-1 and 13-2, and are formed in a casing in which both heat exchangers are integrated.

  In the space between the in-cylinder spaces of the water refrigerant heat exchanger units 13-1 and 13-2, the water refrigerant heat exchanger units 13-1 and 13-2 and the refrigerant heat exchanger units 17-1 and 12-2 are provided. In order to prevent heat loss, it is preferable to install a heat insulating material 136. Further, when the water-refrigerant heat exchanger units 13-1, 13-2, and 13-3 are formed in a cylindrical shape, the temperature difference depending on the location of water and refrigerant (normally the lower temperature is low and the upper temperature is high) This causes air convection. This convection becomes an upward flow, and heat exchange loss occurs in both heat exchangers. Therefore, in order to prevent air convection, it is preferable to install a convection prevention plate 137 that closes the opening at the bottom of the water-refrigerant heat exchanger units 13-1, 13-2, 13-3.

  Thus, the water refrigerant heat exchanger 13 is composed of three water refrigerant heat exchanger units 13-1, 13-2, and 13-3, and is formed in a columnar shape in the in-cylinder space of the two units. Since the refrigerant heat exchanger units 17-1 and 17-2 are inserted, the storage space of the refrigerant heat exchanger 17 can be reduced to reduce the size of the device, and the necessary heat exchange. It is possible to reduce the number of man-hours for equipment having the ability.

  For example, assuming that the capacity of one water refrigerant heat exchanger unit 13-1 is 2 kW, 2 kW × number of units = capability. In this embodiment, the capacity is 2 kW × 3 = 6 kW.

  The number of water-refrigerant heat exchanger units is two or more, and can be increased or decreased according to the required capacity. The refrigerant heat exchanger unit is inserted into the in-cylinder space of at least one, preferably two or more water-refrigerant heat exchanger units.

11 Refrigerant Circuit 12 Compressor 13 Water Refrigerant Heat Exchanger 13-1, 13-2, 13-3 Water Refrigerant Heat Exchanger Unit 17 Refrigerant Heat Exchanger 17-1, 17-2 Refrigerant Heat Exchanger Unit

Claims (3)

A heat exchanger of a heat pump type water heater that heats water by exchanging heat with a high-temperature and high-pressure refrigerant in a water refrigerant heat exchanger,
The water refrigerant heat exchanger is formed by connecting a plurality of water refrigerant heat exchanger units according to the required heat exchange capacity in parallel, and the refrigerant supplied to the compressor and the plurality of water refrigerant heat exchanges. A refrigerant heat exchanger for exchanging heat with the refrigerant flowing out of the condenser unit is provided in the refrigerant circuit;
The plurality of water refrigerant heat exchanger units are formed in a cylindrical shape, and the refrigerant formed in a cylindrical shape in an in-cylinder space of at least one water refrigerant heat exchanger unit among the plurality of water refrigerant heat exchanger units. A heat exchanger for a heat pump type hot water heater, wherein the water-refrigerant heat exchanger and the refrigerant heat exchanger are assembled integrally with the heat exchanger inserted.   The refrigerant heat exchanger is divided into a plurality of refrigerant heat exchanger units connected in series with each other, and each of the plurality of water refrigerant heat exchanger units has an in-cylinder space of two or more water refrigerant heat exchanger units. The heat exchanger of the heat pump type hot water heater according to claim 1, wherein the refrigerant heat exchanger unit is inserted.   The plurality of water refrigerant heat exchanger units are formed by forming a thin tube through which high-temperature and high-pressure refrigerant flows and a thick tube through which water flows into a spiral coil shape, and alternately arranging the thin tubes and the large tubes. A refrigerant inlet header to which the inlet of the thin tube of each water refrigerant heat exchanger unit is connected, a refrigerant outlet header to which the outlet of the thin tube of each water refrigerant heat exchanger unit is connected, and each water refrigerant heat 3. A water inlet header to which an inlet of a thick pipe of the exchanger unit is connected, and a water outlet header to which an outlet of a thick pipe of each water refrigerant heat exchanger unit is connected. The heat exchanger of the heat pump type water heater described in 1.

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