JP2005201603A - Residential air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a residential air conditioner capable of appropriating an outdoor unit of an existing residential heat pump type air conditioner, and capable of providing a comfortable air conditioning effect by leading cold/hot water to heat transfer parts. <P>SOLUTION: The residential air conditioner is provided with an air side heat exchanger 1 of an electric power drive type having a condensing function of condensing a refrigerant during cooling operation, and an evaporating function of evaporating the refrigerant during heating operation, a water side heat exchanger 2 carrying out heat exchange between the refrigerant and water to provide cold/hot water, and the heat transfer parts 32, 34a, 34b, and 36 to which the cold/hot water of the water side heat exchanger 2 is led through piping. The air side heat exchanger 1 and the water side heat exchanger 2 are composed as separate bodies. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a residential air conditioning apparatus that is installed in a general house and performs indoor air conditioning.

  In general, there is a heat pump type air conditioner in a residential air conditioner. This air conditioner has an outdoor unit installed on the veranda, balcony, etc., and this outdoor unit absorbs indoor heat during cooling and carries it into the atmosphere while it absorbs heat from the atmosphere during heating and carries it into the room Therefore, air conditioning is performed.

  On the other hand, there is a gas hot water cooling / heating system in a residential air conditioning apparatus. This gas hot water cooling and heating system is equipped with large gas boilers on the verandas and balconies, etc., and the hot water obtained by this gas boiler is sent to hot water around the water and air conditioning to each room by a circulation pump for heating and dehumidification ing.

  However, in the above-described heat pump type air conditioner, since chlorofluorocarbon or alternative chlorofluorocarbon refrigerant is circulated, it has undesirable characteristics such as generation of toxic gas and flammability when heated in a disaster such as a fire. There are problems such as sudden temperature changes in the room and problems that cause the room to dry more than necessary, and a comfortable cooling and heating effect cannot be obtained.

  Therefore, it is ideal that water should be used as the refrigerant for the air conditioner in the house. Conventionally, in such an air conditioning unit using water as a refrigerant, there is an industrial (business) cold / warm water generating device called a heat pump chiller, but the heat pump chiller is too large to be installed because the main body equipment is too large Therefore, there is a problem that it cannot be diverted to a house as it is. Therefore, when it is going to make the said heat pump chiller small, there exists a problem that manufacturing time and manufacturing cost increase because it is necessary to manufacture newly for housing | casing.

  On the other hand, since the gas hot water cooling / heating system uses gas as a power source, it is not preferable for environmental pollution and safety, and considering the safety of a large gas boiler, the service life is as short as 7 to 10 years. Therefore, there are problems that the running cost is high and the energy cost is high as a power source.

  The present invention has been made in consideration of the above-described circumstances, and can utilize an outdoor unit of an existing residential heat pump type air conditioner, and can provide a comfortable cooling and heating effect by guiding cold and hot water to the heat transfer section. An object is to provide a cooling and heating device for a house.

  In order to solve the above problems, the invention according to claim 1 is a power-driven air-side heat having a condensing function for condensing the refrigerant during cooling operation and an evaporating function for evaporating the refrigerant during heating operation. An air exchanger comprising: an exchanger; a water-side heat exchanger that exchanges heat between the refrigerant and water to produce cold / hot water; and a heat transfer unit that guides the cold / hot water of the water-side heat exchanger through a pipe. The heat exchanger and the water-side heat exchanger are configured separately.

  According to the first aspect of the present invention, since the air-side heat exchanger and the water-side heat exchanger are configured separately, the outdoor unit of an existing residential heat pump air conditioner is diverted to the air-side heat exchanger. It is possible to guide the cold / hot water to the heat transfer section simply by newly installing a water-side heat exchanger.

  Therefore, it is possible to divert an existing outdoor unit of a heat pump air conditioner for residential use to an air-side heat exchanger, and to install a residential air-conditioning / heating device using cold / hot water as a refrigerant by simply installing a water-side heat exchanger. Since it can provide, construction man-hours, manufacturing time, and manufacturing cost can be reduced. Moreover, since cold / hot water can be guide | induced to a heat-transfer part, the malfunction which dries indoor indoors more than needed and the indoor is dried more than needed is eliminated, and the comfortable air-conditioning effect is acquired.

  According to a second aspect of the present invention, in the residential air conditioning apparatus according to the first aspect, the water-side heat exchanger is wound in an elliptical shape extending in the vertical direction in the installed state, and the refrigerant and water are It has the heat exchange piping which heat-exchanges and makes cold / warm water.

  According to the invention described in claim 2, since the water-side heat exchanger has the heat exchange pipe formed in an elliptical shape extending in the vertical direction in the installed state, the heat exchange efficiency between the refrigerant and the water. And the installation space can be reduced.

  According to a third aspect of the present invention, in the residential air-conditioning apparatus according to the second aspect, the heat exchange pipe is introduced from the air-side heat exchanger inserted into the water pipe and the water pipe through which the water flows. And a plurality of refrigerant pipes through which the refrigerant to be circulated is provided.

  According to the invention of claim 3, the heat exchange pipe includes a water pipe through which water is circulated, and a plurality of refrigerant pipes through which the refrigerant that is inserted into the water pipe and guided from the air-side heat exchanger is circulated. As a result, the heat exchange efficiency between the refrigerant and water can be further increased.

  According to a fourth aspect of the present invention, in the residential air-conditioning apparatus according to the third aspect, the plurality of refrigerant pipes are radially arranged radially in the water pipe, and inside the radial pipes. And a spiral pipe to be arranged.

  According to the invention described in claim 4, since the plurality of refrigerant pipes are arranged in a radial direction by arranging the spiral pipes inside the radial pipes, Distribution can be made smooth. Moreover, by arranging the helical pipe, the contact area with water is increased, and the heat exchange efficiency between the refrigerant and water can be further increased.

  According to a fifth aspect of the present invention, in the residential air conditioning apparatus according to the fourth aspect, the helical pipe has a helical pitch in a range of 130 to 230 mm.

  According to the fifth aspect of the present invention, the spiral pipe has a spiral pitch in the range of 130 to 230 mm, thereby smoothly circulating the refrigerant in the spiral pipe and increasing the contact area with water. Can do.

  That is, if the spiral pitch is less than 130 mm, the contact area with water further increases, but the refrigerant cannot be smoothly circulated in the spiral pipe. Further, when the helical pitch exceeds 230 mm, the refrigerant can be smoothly circulated in the helical pipe, but the contact area with water is reduced and the heat exchange efficiency is lowered. Therefore, the spiral pitch was set to a range of 130 to 230 mm.

  As described above, according to the present invention, since the air side heat exchanger and the water side heat exchanger are configured separately, the outdoor unit of an existing residential heat pump air conditioner is installed in the air side heat exchanger. The cold / hot water can be guided to the heat transfer section simply by installing a new water-side heat exchanger.

  Therefore, according to the present invention, it is possible to divert an existing outdoor unit of a heat pump type air conditioner for a house to the air-side heat exchanger, and the cold and hot water can be used as the refrigerant only by newly installing the water-side heat exchanger. Therefore, it is possible to reduce the construction man-hours, the manufacturing time, and the manufacturing cost. Moreover, since cold / hot water can be guide | induced to a heat-transfer part, the malfunction which dries the indoor rapid temperature change and the room more than needed is eliminated, and the comfortable air-conditioning effect is acquired.

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

  FIG. 1 is a piping system diagram showing an embodiment of a residential air-conditioning apparatus according to the present invention, FIG. 2 is a configuration diagram showing the internal structure of the air-side heat exchanger and the water-side heat exchanger in FIG. ) And (B) are a front view and a side view showing the heat exchange pipe of FIG. 2, and FIGS. 4A and 4B are a longitudinal sectional view and a transverse cross section showing the heat exchange pipe of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an air conditioning system diagram showing an embodiment of a residential air conditioning apparatus according to the present invention. In addition, the air side heat exchanger and heat transfer part in this embodiment comprise a general heat pump type air conditioner. In this case, the air side heat exchanger becomes an outdoor unit, and the heat transfer part becomes an indoor unit.

  As shown in FIG. 1, an air-side heat exchanger 1 to which an outdoor unit of an existing air-cooled packaged air conditioner is applied is installed outdoors and is driven by electric power to condense refrigerant such as CFC or alternative CFC during cooling operation. It has a condensing function and an evaporation function for evaporating the refrigerant during heating operation.

  The air-side heat exchanger 1 is connected to the water-side heat exchanger 2 via two refrigerant pipes 3a and 3b, and is a compressor that compresses refrigerant by being driven by electric power as shown in FIG. This compressor 4 is connected to a four-way valve 6 via an accumulator 5, and by switching the four-way valve 6, the refrigerant compressed to high temperature and high pressure by the compressor 4 during the cooling operation side The low-pressure liquid refrigerant is condensed by the air blown by the blower 7 and evaporated in the water-side heat exchanger 2 to convert the circulating water into cold water, and the refrigerant returns to the compressor 3. During the heating operation, the refrigerant compressed to high temperature and high pressure by the compressor 4 is condensed by the water side heat exchanger 2 to convert the circulating water to hot water, and the refrigerant is evaporated by the air side heat exchanger 1. It is configured to return to 4.

  On the other hand, the water-side heat exchanger 2 is installed in the vicinity of the air-side heat exchanger 1, and is configured as a separate body. That is, the water-side heat exchanger 2 is supplied with the refrigerant condensed by the air-side heat exchanger 1 during the cooling operation, and exchanges heat with the circulating water circulating indoors in the water-side heat exchanger 2 to convert the circulating water into cold water. On the other hand, during the heating operation, the refrigerant compressed by the compressor 4 is supplied, and the water-side heat exchanger 2 exchanges heat with the circulating water that circulates indoors to make the circulating water hot water.

  Further, the water-side heat exchanger 2 includes a circulation pump 8 for circulating the circulating water that has become the cold water or the hot water, a pressurizing pump 9 for replenishing the circulating water, a refrigerant and the circulating water. And a heat exchanging pipe 10 that exchanges heat into cold / hot water.

  As shown in FIGS. 2 and 3 (A) and 3 (B), the heat exchange pipe 10 has a diameter of 44.55 mm and is wound by bending a copper tube having a total length of 4000 mm into an ellipse extending in the vertical direction in the installed state. The two refrigerant pipes 3a and 3b are connected to each other through refrigerant conduits 11a and 11b connected to both ends. The heat exchange pipe 10 includes a supply pipe 12 for supplying the circulated water that has been heat-exchanged into cold water or hot water, and the circulated water that has become hot water or cold water in an indoor heat transfer section described later. Receiving pipe 13 is connected. The circulation pipe 8 is inserted into the receiving pipe 13 and a supply pipe 14 connected to the pressurizing pump 9 is branched and connected.

  As shown in FIGS. 3 (A) and 3 (B) and FIGS. 4 (A) and 4 (B), the heat exchange pipe 10 has a circulating water pipe 15 having a diameter of 44.55 mm and circulating circulating water, and this circulating water. The refrigerant is inserted into the pipe 15 and has eight refrigerant pipes 16 having a diameter of 8 mm through which the refrigerant guided from the air-side heat exchanger 1 is circulated. The eight refrigerant pipes 16 are arranged in the radial direction in the circulating water pipe 15. And seven radial pipes 16a arranged radially, and one spiral pipe 16b arranged on the inner peripheral side of the seven radial pipes 16a.

  The spiral pitch P of the spiral pipe 16b is in the range of 130 to 230 mm, and is preferably set to 180 mm. That is, when the helical pitch P is less than 130 mm, the contact area with the circulating water further increases, but the refrigerant cannot be smoothly circulated in the helical pipe 16b. Further, when the helical pitch P exceeds 230 mm, the refrigerant can be smoothly circulated in the helical pipe 16b, but the contact area with the circulating water is reduced and the heat exchange efficiency is lowered. Therefore, the helical pitch P is set in the range of 130 to 230 mm, preferably 180 mm.

  Furthermore, in order to circulate the chilled water or the circulated water that has become hot water as shown in FIG. 1 in the supply pipe 12 and the receiving pipe 13 of the water-side heat exchanger 2, respectively, via the vibration-proof flexible pipes 17 and 18. One end of a forward pipe 21 and a return pipe 22 made of a coated copper pipe having a diameter of 32A are connected to each other, and the other ends of the forward pipe 21 and the return pipe 22 are connected to a forward header 23 and a return header 24 on the fan coil unit side, respectively. Has been. The forward pipe 21 and the return pipe 22 are branched from the middle and connected to the forward header 25 and the return header 26 on the floor heating side.

  Here, the forward header 23 and the return header 24 on the fan coil unit side are respectively disposed in the ceiling space 27, for example, while the forward header 25 and the return header 26 on the floor heating side are respectively in the underfloor space 28, for example. Be placed.

  One end of a plurality of branch pipes 31 is connected to the forward header 23 and the return header 24. The branch pipes 21 are seamless pipes that are formed by bending copper pipes. The ends are directly connected to a ceiling cassette type fan coil unit 32 as a heat transfer section arranged in the ceiling back space 27.

  On the other hand, the forward header 25 and the return header 26 on the floor heating side are connected to one ends of branch pipes 33a and 33b made of 12.7 mm diameter annealed copper pipes as shown in FIG. 33a and 33b are seamless pipes that are formed by bending an annealed copper pipe, and the other ends of the pipes are connected to floor heating panels 34a and 34b as heat transfer portions arranged in the underfloor space 28, respectively. Yes.

  Further, each end of a branch pipe 35 made of an annealed copper pipe having a diameter of 12.7 mm is connected to the forward header 25 and the return header 26 on the floor heating side, and these branch pipes 35 bend the annealed copper pipe. The other end of each pipe is connected to a meandering part 36 made of polyethylene as a heat transfer part arranged in the underfloor space 28. The meandering portion 36 is connected to the branch pipe 35 via a unillustrated union joint, and hot water is supplied to the meandering portion 36 and used as it is for floor heating.

  In addition, electromagnetic valves 37 are respectively inserted into the branch pipes 33a, 33b, and 35 connected to the outgoing header 25 side, and these electromagnetic valves 37 are closed when no floor heating is required. Circulating water is prevented from being supplied to the branch pipes 33a, 33b, 35 connected to the header 25 side.

  Next, the air conditioning system of this embodiment is demonstrated based on FIG.

  An inlet 40 for taking in fresh air and a discharge port 41 for discharging indoor dirty air to the outdoors are respectively attached to the wall surface 38 of the house, and one end of an intake duct 42 is connected to the intake 40, and this intake duct A filter 43 is inserted into 42, and the other end is connected to the total heat ventilation fan 44. The total heat ventilation fan 44 is also connected to the other end of an exhaust duct 45 whose one end is connected to the discharge port 41.

  One end of each of the intake duct 46 and the supply duct 47 is connected to the total heat ventilation fan 44, and an intake port 48 provided at the other end of the intake duct 46 faces the room. A fan 49 is disposed in the supply duct 47 and the other end is connected to the chamber box 50.

  One end of each of six exhaust ducts 51 is connected to the chamber box 50, and the other two ends of these exhaust ducts 51 are connected to the fan coil unit 32, respectively, An exhaust port 52 for supplying outside air directly indoors is provided. Each fan coil unit 32 is supplied with the cold / hot water heat-exchanged by the water-side heat exchanger 2 as described above, and the cold air or hot air heat-exchanged by the cold / hot water is supplied to each fan coil unit 32. It blows out into the room from the outlet.

  In the air conditioning system configured as described above, when the fan 49 is driven, fresh air is taken in from the intake port 40, and after the fresh air passes through the intake duct 42 and dust and the like are removed by the filter 43, the total heat exhaust fan 44 and the supply duct 47 are supplied to the chamber box 50.

  The fresh air supplied to the chamber box 50 passes through the four exhaust ducts 51 and is exhausted directly from the exhaust ports 52 into the room, and passes through the two exhaust ducts 51 and passes from the water-side heat exchanger 2. Heat is exchanged into cold air or hot air by the supplied cold / hot water and blown out from the outlet of each fan coil unit 32.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 1, during the cooling operation, the refrigerant condensed by the air-side heat exchanger 1 evaporates in the water-side heat exchanger 2 and becomes cold water. The cold water is supplied to the forward header 23 via the supply pipe 12 and the forward pipe 21 by driving the circulation pump 8. Next, the cold water supplied to the outgoing header 23 is branched by a plurality of branch pipes 32 arranged in the ceiling space 27 and then supplied to each fan coil unit 32.

  Then, outside air is supplied to each fan coil unit 32 by the air conditioning system shown in FIG. 5, and the outside air is heat-exchanged by cold water to become cold air, and this cold air enters the room from the outlet of each fan coil unit 32. Air is blown out.

  Here, although the refrigerant temperature of the air-conditioning apparatus corresponding to the gas refrigerant changes abruptly in a short time, the cold water temperature of the present embodiment does not change abruptly. The air is blown into the room from the air outlet, and a comfortable cooling can be provided to the occupant.

  The circulating water heated by the heat exchange in each fan coil unit 32 is returned to the return header 24 through a plurality of branch pipes 31 and then returned from the return header 24 through the return pipe 22 and the receiving pipe 13. It returns to the water side heat exchanger 2, is made into cold water again, and circulates indoors similarly to the above.

  During cooling, the electromagnetic valve 37 inserted in the branch pipes 33a, 33b, 35 for floor heating is closed so that the circulating water is not supplied to the branch pipes 33a, 33b, 35, respectively.

  On the other hand, at the time of heating operation, the electromagnetic valve 37 inserted in the branch pipes 33a, 33b, 35 for floor heating is opened in advance. And the refrigerant | coolant compressed by driving the compressor 4 is supplied to the water side heat exchanger 2, heat-exchanges with the circulating water which circulates indoors, and makes circulating water warm water. This hot water is supplied to the forward headers 23 and 25 through the supply pipe 12 and the forward pipe 21 by driving the circulation pump 8. Next, the hot water supplied to the outgoing header 23 is branched by a plurality of branch pipes 31 and supplied to each fan coil unit 32. Further, the hot water supplied to the outgoing header 25 is supplied to the floor heating panels 34 a and 34 b and the meandering section 36 which are branched by the plurality of branch pipes 33 a, 33 b and 35 and arranged in the underfloor space 15.

  Further, the circulating water cooled by heat exchange in each fan coil unit 32 is returned to the return header 24 through a plurality of branch pipes 31, and then the return pipe 22 and the receiving pipe 13 are connected from the return header 24. Then, it returns to the water side heat exchanger 2, is made warm water again, and circulates indoors similarly to the above.

  On the other hand, the hot water supplied to the floor heating panels 34a and 34b and the meandering section 36 heats each room, and the heat-exchanged circulating water returns to the return header 26 via a plurality of branch pipes 33a, 33b and 35. After that, the return header 26 returns to the water-side heat exchanger 2 through the return pipe 22 and the receiving pipe 13 and is again heated to circulate indoors as described above.

  As described above, according to the present embodiment, the air side heat exchanger 1 and the water side heat exchanger 2 are configured as separate bodies, so that the air side heat exchanger 1 is provided outside the existing residential heat pump air conditioner. The hot and cold water can be led to the fan coil units 32, the floor heating panels 34a and 34b, and the meandering portion 36, which are heat transfer portions, simply by newly installing the water-side heat exchanger 2. .

  Therefore, in the present embodiment, an existing residential heat pump can be diverted to the air-side heat exchanger 1, and a residential air-conditioning / cooling apparatus using cold / hot water as a refrigerant only by newly installing the water-side heat exchanger 2 Therefore, it is possible to reduce construction man-hours, manufacturing time, and manufacturing cost. Moreover, since cold / hot water can be led to each fan coil unit 32, floor heating panels 34a and 34b, and meandering portion 36, it is possible to eliminate a sudden temperature change in the room and a problem that the room is dried more than necessary. The air conditioning effect is obtained.

  In addition, according to the present embodiment, the water-side heat exchanger 2 has the heat exchange pipe 10 that is wound in an elliptical shape extending in the up-down direction in the installed state, so that the heat exchange pipe 10 is interposed. As a result, the area of heat exchange between the refrigerant and the circulating water is increased, so that the heat exchange efficiency can be improved and the installation space can be reduced.

  Furthermore, according to the present embodiment, the heat exchange pipe 10 includes a water pipe 15 through which water is circulated, and a plurality of refrigerant pipes through which the refrigerant that is inserted into the water pipe 15 and guided from the air-side heat exchanger 1 is circulated. 16, the heat exchange efficiency between the refrigerant and the circulating water can be further enhanced.

  And according to this embodiment, the plurality of refrigerant pipes 16 are arranged in a radial direction by arranging the helical pipes 16b inside the plurality of radial pipes 16a. Therefore, circulation of circulating water can be made smooth. Moreover, by arranging the spiral pipe 16b, the contact area with the circulating water is increased, and the heat exchange efficiency between the refrigerant and the circulating water can be further increased.

  According to the present embodiment, by setting the spiral pitch of the spiral pipe 16b in the range of 130 to 230 mm, the refrigerant can be smoothly circulated in the spiral pipe 16b and the contact area with the circulating water can be increased. it can.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, cold / hot water is supplied from the water-side heat exchanger 2 to the fan coil units 32 via the supply pipe 12, the forward pipe 21, the forward header 23, and the branch pipe 31, but this is not limitative. Instead, cold / hot water may be directly supplied to each fan coil unit 32 from the water-side heat exchanger 2 through the supply pipe 12, the forward pipe 8, and the branch pipe 31.

  Similarly, in this embodiment, the water-side heat exchanger 2 passes through the supply pipe 12, the outgoing pipe 21, the outgoing header 25, and the plurality of branch pipes 33a, 33b, 35 to the floor heating panels 34a, 34b and the meandering section 36. Although the hot water is supplied, the present invention is not limited to this, and the water side heat exchanger 2 passes through the supply pipe 12, the forward pipe 21, and the plurality of branch pipes 33a, 33b, 35, and 34a, 34b and the meandering section 36. You may make it supply hot water directly.

  However, to equalize the flow rate and temperature of cold / hot water, each fan coil passes from the water-side heat exchanger 2 through the supply pipe 12, the outgoing pipe 21, the outgoing header 23, and the branch pipe 31 as in the above embodiment. While supplying cold / hot water to the unit 32, hot water is supplied to the floor heating panels 34a, 34b and the meandering section 36 via the supply pipe 12, the outgoing pipe 21, the outgoing header 25, and the plurality of branch pipes 33a, 33b, 35. desirable.

It is a piping system diagram showing one embodiment of a residential air conditioning apparatus according to the present invention. It is a block diagram which shows the internal structure of the air side heat exchanger and water side heat exchanger in FIG. (A), (B) is the front view which shows the piping for heat exchange of FIG. 2, and a side view. (A), (B) is the longitudinal cross-sectional view which shows the piping for heat exchange of FIG. 3, and a cross-sectional view. It is an air-conditioning system diagram which shows one Embodiment of the air conditioning apparatus for houses which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air side heat exchanger 2 Water side heat exchanger 4 Compressor 10 Heat exchange piping 12 Supply piping 13 Receiving piping 15 Circulating water piping 16 Refrigerant piping 16a Radial piping 16b Spiral piping 21 Outbound piping 22 Return piping 23 Outbound header 24 Return header 25 Forward header 26 Return header 27 Ceiling space 28 Underfloor space 31 Branch piping 32 Fan coil unit (heat transfer section)
33a, 33b Branch piping 34a, 34b Floor heating panel (heat transfer section)
36 Meandering part (heat transfer part)
37 Solenoid valve 40 Intake port 41 Discharge port 42 Intake duct 43 Filter 44 Total heat ventilation fan 45 Exhaust duct 46 Intake duct 47 Supply duct 48 Inlet port 49 Fan 50 Chamber box 51 Exhaust duct 52 Exhaust port

Claims (5)

A power-driven air-side heat exchanger having a condensing function for condensing refrigerant during cooling operation and an evaporation function for evaporating the refrigerant during heating operation;
A water-side heat exchanger that exchanges heat between the refrigerant and water to produce cold and hot water;
A heat transfer section through which cold / hot water of the water-side heat exchanger is guided through a pipe;
With
The residential air conditioning apparatus, wherein the air side heat exchanger and the water side heat exchanger are configured separately. The residential air conditioning apparatus according to claim 1,
The water-side heat exchanger is formed in an elliptical shape extending in the up-down direction in an installed state, and has a heat exchange pipe that exchanges heat between the refrigerant and water to make cold / hot water. Residential air conditioning unit. The residential air conditioning apparatus according to claim 2,
The heat exchange pipe includes a water pipe through which the water is circulated, and a plurality of refrigerant pipes through which the refrigerant inserted into the water pipe and guided from the air-side heat exchanger is circulated. Residential air conditioning unit. The residential air conditioning apparatus according to claim 3,
The plurality of refrigerant pipes include a radial pipe arranged radially in the radial direction in the water pipe and a helical pipe arranged inside these radial pipes. . The residential air conditioning apparatus according to claim 4,
The residential air conditioning apparatus, wherein the spiral pipe has a spiral pitch in a range of 130 to 230 mm.

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