JP5076745B2 - Ventilation air conditioner - Google Patents

Abstract

The ventilating air-conditioning system includes an air supply fan; an exhaust fan; a compressor; a first heat exchanger heat-exchanging between outdoor air sent from the air supply fan and a refrigerant; an expansion mechanism; a second heat exchanger heat-exchanging between air in a sanitary space sent by the exhaust fan and a refrigerant; and a refrigerant circuit piped so that a refrigerant circulates in order of the compressor, first heat exchanger, expansion mechanism, and second heat exchanger, or in order of the compressor, second heat exchanger, expansion mechanism, and first heat exchanger. The system heats or cools an indoor space while ventilating a sanitary space by transferring heat between the first heat exchanger and second heat exchanger through a refrigerant.

Description

  The present invention relates to a ventilation air conditioner that uses a heat pump to ventilate a sanitary space such as a bathroom and air-condition an indoor space.

  As a conventional ventilation air conditioner such as a bathroom using a heat pump, one heat exchanger of the heat pump radiates (or absorbs) heat from the indoor space other than the bathroom, and the air enters the bathroom. There is one that air-conditions while ventilating the bathroom by blowing out and absorbing heat (or radiating heat) from the other heat exchanger of the heat pump to the air discharged from the bathroom to the outside (for example, see Patent Document 1).

  Also, the heat pump is separated into an outdoor unit and an indoor unit, and heat is absorbed (or radiated) from outside air in the heat exchanger provided in the outdoor unit, and heat is radiated (or absorbed) into the bathroom air in the heat exchanger provided in the indoor unit. In some cases, the bathroom is air-conditioned, and the bathroom is ventilated by a ventilation fan provided in the indoor unit (for example, see Patent Document 2).

Some indoor units separated from the heat pump outdoor unit are provided with a sensible heat exchange air element, and sensible heat exchange is performed with the sensible heat exchange air element during ventilation (see, for example, Patent Document 3).
JP 2005-180712 A JP 2002-349930 A JP-A-9-53840

  As described above, various types of ventilation air conditioners such as bathrooms using heat pumps have been proposed. The bathroom air conditioner exemplified in Patent Document 1 collects heat from the air exhausted from the bathroom to the outside during ventilation, air-conditions air from indoor spaces other than the bathroom, and supplies the air to the bathroom. The outdoor air that is not air-conditioned into the indoor space impairs comfort due to a draft feeling, and there are problems such as mold generation due to condensation near the natural air inlet and dirt on the wall due to dust from outdoor air. .

  In addition, the bathroom air conditioner exemplified in Patent Document 2 does not need to be ventilated during air conditioning, but cannot recover heat during ventilation, and the heat pump is installed separately in the bathroom and in the room. There was a problem that the refrigerant piping work for connecting the outside was necessary, the workability deteriorated, and the installation space for the outdoor unit was also required.

  Moreover, the air conditioner for high airtight houses exemplified in Patent Document 3 requires a space of the sensible heat element portion in the device, and there is a problem that it is difficult to secure a ventilation air volume due to a large pressure loss of the sensible heat element. there were.

  Furthermore, when the sensible heat element is replaced with a total heat element so that latent heat is also collected and moisture is not discharged outside, the odor of a toilet or the like is transferred to another room as described in Patent Document 3. There is a possibility that the condensation amount of the total heat element increases during ventilation in the bathroom, etc., and there are problems such as dripping on the back of the ceiling due to insufficient drainage treatment and insufficient ventilation air volume due to increased pressure loss, and maintenance of the total heat element However, there was a problem that it was necessary frequently.

  The present invention solves the above-mentioned conventional problems, improves the comfort of the indoor space, can prevent mold growth and dirt near the natural air inlet, and saves space and improves workability. Further, it is an object of the present invention to provide a ventilation air conditioner that can save space, easily secure ventilation air volume, has little odor transfer, is easy to drain, and has a low maintenance frequency.

In order to achieve the above-described object, an air supply fan that sucks outdoor air from an air supply opening that opens to the outside and blows air from an air discharge opening that opens to an indoor space, and an air from an air intake opening that opens to an indoor sanitary space. An exhaust fan that blows out air from an exhaust port that opens to the outside, a compressor that compresses the refrigerant, a first heat exchanger that exchanges heat between the air blown by the air supply fan and the refrigerant, and a refrigerant An expansion mechanism for expanding the air, a second heat exchanger for exchanging heat between the air blown by the exhaust fan and the refrigerant, the compressor, the first heat exchanger, the expansion mechanism, and the second heat exchanger. Or a refrigerant circuit piped so that refrigerant circulates in the order of the compressor, the second heat exchanger, the expansion mechanism, and the first heat exchanger, and the first heat exchanger and the second heat exchanger. Refrigerant into the heat exchanger Ri by moving heat, the ventilating sanitary space by heating or cooling the indoor space while the air conditioning by the air conditioner installed the air drawn in the suction port opened to the sanitary space in addition to the sanitary space And using the heat of the blown air , condensate water or dew condensation water is provided below the air supply and exhaust air passages including the first heat exchanger and the second heat exchanger. A drain pump is provided at the deepest portion of a drain device having a gradient at the bottom for draining or evaporating water, and the drain pump is operated when draining to a higher location than the drain device. Is.

  Further, the drain device for draining or evaporating condensed water or condensed water is provided with a drain pump, and the drain pump is operated when draining to a place higher than the drain device.

  Further, the air supply air passage that sucks outdoor air and blows it out to the indoor space and the exhaust air passage that sucks sanitary air and discharges it to the outside are heat-insulated.

  Further, at least a compressor, a first heat exchanger, a second heat exchanger, and an expansion mechanism are incorporated in the main body.

  The air supply fan further includes an auxiliary heater that heats at least a part of the air blown by the air supply fan.

  In addition, a preheating heater for preheating the air before being supplied to the second heat exchanger by the exhaust fan is further provided.

  The first heat exchanger or the second heat exchanger is provided with a coil temperature sensor for detecting the temperature of the refrigerant, and the flow path switching valve is switched based on the refrigerant temperature of the first heat exchanger or the second heat exchanger. It is characterized by this.

  The apparatus further includes a bypass circuit that branches from a refrigerant circuit that extends from the discharge side of the compressor to the expansion mechanism and merges with a refrigerant circuit that extends from the expansion mechanism to the suction side of the compressor, and an on-off valve that opens and closes the bypass circuit. It is characterized by that.

  In addition, a refrigerant heating means for heating the refrigerant is interposed in the refrigerant circuit so as to be in series or in parallel with the second heat exchanger.

  Further, the refrigerant heating means is a refrigerant heater that heats the refrigerant by electric heating.

  Further, the refrigerant heating means is a refrigerant-water heat exchanger that heats the refrigerant by exchanging heat with hot water.

  Moreover, the hot water boiled with the heat pump type hot water heater is used for the hot water supplied to the refrigerant-water heat exchanger.

  Further, the refrigerant-water heat exchanger is configured to supply room temperature water to the refrigerant-water heat exchanger so that the refrigerant dissipates heat.

  According to the ventilation air conditioner of the present invention, while exhausting moisture and odor generated from the sanitary space, the heat of the air is recovered and the indoor space is air-conditioned while supplying fresh outdoor air. In addition, air conditioning can be combined with energy saving while improving air quality.

In the ventilation air conditioner according to claim 1, by operating the drain pump, condensed water or condensed water can be drained higher than the drain device, and the space behind the ceiling is narrow and the drain gradient cannot be taken. Can be constructed .

Further, in the ventilation air conditioner according to claim 2, by preventing heat from leaking while preventing condensation on the outer wall of the ventilation air conditioner by heat-insulating the surroundings of the air supply and exhaust air passages, Energy saving can be improved.

Further, in the ventilation air conditioner according to claim 3 , all of the compressor, the first heat exchanger, the expansion mechanism, and the second heat exchanger that constitute the refrigerant circuit are housed inside the ventilation air conditioner installed in the ceiling of the bathroom or the like. By doing so, it is possible to save space and improve workability.

In the ventilating air-conditioning apparatus according to the fourth aspect, it is possible to compensate for a lack of heating capacity in a low temperature environment by heating at least a part of the air blown by the air supply fan with the auxiliary heater.

Further, in the ventilation air conditioner according to claim 5 , by preheating the air before being supplied to the second heat exchanger by the preheating heater, the heating capacity is lowered in the low temperature environment or the frost is formed on the second heat exchanger. In addition, the attached frost can be removed.

Further, in the ventilation air conditioner according to claim 6 , when the frost adheres to the first heat exchanger or the second heat exchanger at a low temperature, the flow path switching valve is switched based on the refrigerant temperature, thereby Removal can be performed.

Further, in the ventilation air conditioner according to claim 7 , when frost adheres to the second heat exchanger at a low temperature, the high pressure side and the low pressure side of the refrigerant circuit are opened through the bypass circuit, and the high temperature refrigerant is removed from the second heat exchanger. The adhering frost can be removed by circulating the refrigerant or increasing the refrigerant pressure in the second heat exchanger.

Moreover, in the ventilation air conditioner according to claim 8 , the refrigerant heating means is interposed in the refrigerant circuit so as to be in series or in parallel with the second heat exchanger, and heat absorption capability such as frost adhering to the second heat exchanger is obtained. In the case of a decrease, by operating the refrigerant heating means, it is possible to secure the heat absorption capability and maintain the heating capability.

In the ventilation air conditioner according to the ninth aspect , the refrigerant heating means can be downsized by using a refrigerant heater for heating the refrigerant by electric heat as the refrigerant heating means.

In the ventilation air conditioner according to claim 10 , the refrigerant heating means uses a refrigerant-water heat exchanger that heats the refrigerant by heat exchange with hot water, thereby reducing the amount of power used in the refrigerant heating means. be able to.

In the ventilation air conditioner according to claim 11 , the amount of electric power used by the refrigerant heating means is further reduced by using hot water boiled by a heat pump type hot water heater as hot water supplied to the refrigerant-water heat exchanger. be able to.

Further, in the ventilation air conditioner according to claim 12 , by configuring so that the refrigerant radiates heat to the normal temperature water supplied to the refrigerant-water heat exchanger when the heat radiation capability is insufficient at high temperatures such as in summer, The lack of heat dissipation can be resolved and the cooling capacity can be maintained.

This onset Ming is to supply to the heat exchanger inhale air blowoff which is conditioned by the installed air conditioner in addition to sanitary space from the suction port of the sanitary space. Thereby, the heat of the air blown from the air conditioner, which is more efficient than the present ventilation air conditioner, can be used.

  Further, a drain device for draining or evaporating condensed water or condensed water is provided with a drain pump. Thereby, by operating the drain pump, condensed water or condensed water can be drained to a place higher than the drain device.

  In addition, the air supply air passage that sucks outdoor air and blows it into the indoor space and the exhaust air passage that sucks sanitary air and discharges it to the outside are heat-insulated. Thereby, the leakage of heat to the outside can be prevented while preventing condensation on the outer wall of the ventilation air conditioner.

  Further, at least a compressor, a first heat exchanger, a second heat exchanger, and an expansion mechanism are built in the main body. Thereby, all the parts which wanted to be connected with refrigerant | coolant piping can be accommodated in the ventilation air conditioner installed in the ceiling back of a bathroom.

  The auxiliary heater heats at least a part of the air blown by the air supply fan. Thereby, the shortage of heating capacity in a low temperature environment can be compensated.

  Moreover, the air before it is supplied to the second heat exchanger by the preheating heater is preheated. Thereby, the fall of the heating capability in a low temperature environment can be prevented, the frost formation to a 2nd heat exchanger can be suppressed, and the adhering frost can be removed.

  Further, when frost adheres to the first heat exchanger or the second heat exchanger at a low temperature, the flow path switching valve is switched based on the refrigerant temperature. This removes the attached frost.

  Moreover, when frost adheres to the second heat exchanger at a low temperature, the high pressure side and the low pressure side of the refrigerant circuit are opened through the bypass circuit. Thereby, a high temperature refrigerant can be circulated through the second heat exchanger, or the adhering frost can be removed by increasing the refrigerant pressure in the second heat exchanger.

  The refrigerant heating means is interposed in the refrigerant circuit so as to be in series or in parallel with the second heat exchanger. As a result, when the heat absorption capability is lowered, for example, frost adheres to the second heat exchanger, the heat absorption capability can be ensured by operating the refrigerant heating means, and the heating capability can be maintained.

  Further, a refrigerant heater that heats the refrigerant by electric heat is used as the refrigerant heating means. Thereby, size reduction of a refrigerant | coolant heating means can be achieved.

  Further, a refrigerant-water heat exchanger that heats the refrigerant by heat exchange with hot water is used as the refrigerant heating means. Thereby, the electric power consumption in a refrigerant | coolant heating means can be reduced.

  Moreover, the hot water boiled with the heat pump type water heater is used for the hot water supplied to the refrigerant-water heat exchanger. Thereby, the electric power consumption of a refrigerant | coolant heating means can further be reduced.

  Moreover, when the heat dissipation capability is insufficient at high temperatures such as in summer, the refrigerant is configured to radiate heat to room temperature water supplied to the refrigerant-water heat exchanger. Thereby, the lack of heat dissipation is eliminated and the cooling capacity is maintained.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 is a sketch of an indoor space in which a ventilation air conditioner according to Embodiment 1 of the present invention is installed. In FIG. 1, an indoor space 1 is divided into a sanitary space 6 such as a living room 2, a bathroom 3, a bathroom 4, and a toilet 5, and a main body 7 of a ventilation air conditioner is installed behind the ceiling of the bathroom 3. Yes.

  The main body 7 includes an exhaust duct 9 that communicates the main body 7 with the air supply opening 10 that opens to the outside, an air supply duct 11 that communicates the main body 7 and the air supply opening 10 that opens to the outside, the main body 7 and the living room 2. A blowout duct 13 communicating with the blowout opening 12 opened in the ceiling is connected.

  FIG. 2 is an air passage configuration diagram of the ventilation air conditioner. As shown in the drawing, an exhaust fan 14 is disposed inside the main body 7, and an exhaust duct is disposed on the outlet side of the exhaust fan 14. 9 is provided, and an exhaust air passage 20 that communicates the exhaust connection portion 19 and the suction port 16 of the grill 15 provided on the ceiling surface of the bathroom 3 is formed inside the main body 7. . Therefore, when the exhaust fan 14 is operated, the air in the bathroom 3 is sucked into the exhaust fan 14 through the suction port 16 and is discharged outside through the exhaust duct 9.

  An air supply fan 17 is disposed inside the main body 7, and an air supply connection portion 21 for connecting the air supply duct 11 is provided on the suction side of the air supply fan 17. A blower connection portion 22 that connects the blowout duct 13 is provided on the blowout side 17, and an air supply air passage 23 that connects the air supply connection portion 21 and the blowout connection portion 22 is formed inside the main body 7. Therefore, when the air supply fan 17 is operated, outdoor air is sucked into the air supply fan 17 through the air supply duct 11 and blown out into the living room 2 through the blowout duct 13.

  When the exhaust fan 14 and the air supply fan 17 are continuously operated, fresh outside air is supplied into the living room 2, and the air flows into the bathroom 3 through the louver or undercut portion of the door of the bathroom 3, and sucks into the grill 15. The water is sucked from the mouth 16 together with the water vapor and smell in the bathroom 3 and discharged outside the room.

  Since this air supply / exhaust operation needs to be performed continuously when the airtightness of the building is high (24-hour ventilation), the exhaust fan 14 and the air supply fan 17 have a predetermined air supply amount / exhaust amount, for example, one hour. Thus, continuous operation is performed so as to secure an air supply / exhaust amount corresponding to about half the volume of the indoor space 1. Further, the living room 2 is provided with an air conditioner 18 for controlling the temperature of the room, and the room temperature is appropriately maintained by performing the cooling operation in the summer and the heating operation in the winter. Therefore, when continuous ventilation operation is performed throughout the year as described above, the low temperature air cooled by the air conditioner 18 in the living room 2 in the summer and the high temperature air heated by the air conditioner 18 in the winter are doors of the bathroom 3. Are sucked into the suction port 16 through the louver or undercut portion and discharged to the outside through the main body 7 of the ventilation air conditioner.

  At the bottom of the main body 7 of the ventilation air conditioner, an air inlet 16 of the grill 15 is opened to the ceiling surface of the bathroom 3 and an indoor filter (not shown) for detachably collecting dust is disposed in the air inlet 16. doing.

  Further, on the upstream side of the air supply fan 17 in the air supply air passage 23, an air supply opening / closing device 24 that opens and closes the passage in order from the air supply connection portion 21 and an attachment / detachment for supplementing outdoor dust. A free outdoor filter 25 and a first heat exchanger 26 that mainly exchanges heat between the outdoor air and the refrigerant are provided, and at least a part of the air blown by the air supply fan 17 is heated downstream of the air supply fan 17. An auxiliary heater 27 is provided.

  Further, on the upstream side of the exhaust fan 14 in the exhaust air passage 20, a preheat heater 28 for preheating the intake air and a second heat exchanger 29 for mainly exchanging heat between the intake air and the refrigerant are provided in order from the intake port 16. On the downstream side of the exhaust fan 14, an exhaust opening / closing device 30 that can adjust the opening degree and opens and closes the passage is provided.

  Further, in the supply air passage 23, the upstream side of the first heat exchanger 26 and the upstream side of the second heat exchanger 29 in the exhaust air passage 20 can be connected or blocked, or the communication amount can be adjusted. Air path switching adjustment means 31 is provided.

  Further, an air supply bypass means 32 for blowing a part of outdoor air to the living room 2 without passing through the first heat exchanger 26 is provided in the air supply air passage 23, and bathroom air is provided in the exhaust air air passage 20. Exhaust bypass means 33 is provided for exhausting part of the heat to the outside without passing through the second heat exchanger 29.

  Further, in the exhaust air passage 20, the dehumidification switching that allows communication between the downstream side of the second heat exchanger 29 and the upstream side of the first heat exchanger 26 in the supply air passage 23, or adjustment of the communication amount. Means 34 are provided.

  Further, a large amount of condensed water is once stored in the lower portion of the supply air passage 23 and the exhaust air passage 20 including the first heat exchanger 26 and the second heat exchanger 29 in the main body 7 and then drained or evaporated. A large drain device 35 having a gradient at the bottom is provided, a drain pump 36 is provided at the deepest portion of the large drain device 35, and water can be drained to a location higher than the main body 7 through a drain pipe 37.

  Further, the outer shell of the main body 7 including the supply air passage 23 and the exhaust air passage 20 is subjected to heat insulation processing by sticking a heat insulating material 38.

  FIG. 3 is a refrigerant circuit diagram of the ventilation air conditioner. Inside the main body 7, for example, an HCFC refrigerant (including each atom of chlorine, hydrogen, fluorine, and carbon), an HFC refrigerant (in the molecule) A refrigerant circuit 39 filled with any one of natural refrigerants such as hydrocarbon, carbon dioxide, etc. is formed, and the refrigerant is compressed into the refrigerant circuit 39. A compressor 40, the first heat exchanger 26, an expansion mechanism 41 including an electronic expansion valve for expanding the refrigerant, and the second heat exchanger 29 are provided.

  In the refrigerant circuit 39, the refrigerant compressed by the compressor 40 flows in the order of the first heat exchanger 26, the expansion mechanism 41, and the second heat exchanger 29 and returns to the compressor 40 again (hereinafter referred to as a heating cycle). And a path (hereinafter referred to as a cooling cycle) in which the refrigerant compressed by the compressor 40 flows in the order of the second heat exchanger 29, the expansion mechanism 41, and the first heat exchange heat exchanger 26 and returns to the compressor 40 again. For this purpose, a flow path switching valve 42 is interposed.

  The refrigerant circuit 39 includes a bypass circuit 43 that branches from the pipe connecting the flow path switching valve 42 and the first heat exchanger 26 and joins the pipe connecting the expansion mechanism 41 and the second heat exchanger 29, A bypass circuit 44 that branches from the pipe connecting the first heat exchanger 26 and the expansion mechanism 41 and joins the pipe connecting the second heat exchanger 29 and the flow path switching valve 42 is provided in the bypass circuit 43. In addition, an on-off valve 45 and an on-off valve 46 and a refrigerant heating means 47 are provided in the bypass circuit 44. The refrigerant heating means 47 can use a refrigerant heater 59 or a refrigerant-water heat exchanger 66 described later.

  The first heat exchanger 26 is disposed in the supply air passage 23, and the second heat exchanger 29 is disposed in the exhaust air passage 20. Accordingly, in the first heat exchanger 26, the refrigerant dissipates (or absorbs heat) mainly the outdoor air blown by the air supply fan 17, and in the second heat exchanger 29, mainly in the bathroom 3 by the exhaust fan 14. The refrigerant absorbs heat (or dissipates heat) with respect to the air discharged from the outside.

  In addition, a decompression means 50 composed of a second on-off valve 48 and a capillary tube 49 is interposed in the pipe through which the refrigerant of the first heat exchanger 26 flows. When the switching valve 42 switches the refrigerant flow direction to the direction indicated by the solid line, that is, when the outdoor air blown by the air supply fan 17 is switched to the heating cycle, the refrigerant flows downstream of the decompression means 50 of the first heat exchanger 26. It is configured to exchange heat with the refrigerant flowing upstream of the decompression means 50 after heat exchange.

  Further, a preheating heater 28 having self-temperature controllability is disposed on the windward side of the second heat exchanger 29 in the exhaust air passage 20. When the preheat heater 28 is operated, the preheat heater 28 is sucked into the exhaust air passage 20. The air in the bathroom 3 can be preheated and supplied to the second heat exchanger 29.

  In addition, coil temperature sensors 51 and 52 for detecting the temperature of the refrigerant are provided on the expansion mechanism 41 side of the first heat exchanger 26 and the expansion mechanism 41 side of the second heat exchanger 29.

  FIG. 4 is a construction diagram of the ventilation air conditioner. As shown in the figure, the suspension fitting 54 of the main body 7 is hooked on the bolt 53 provided on the back of the ceiling, and the main body 7 is suspended so as not to contact the ceiling surface. Yes. In the form of this figure, the intake air from the bathroom 3 is conveyed into the main body 7 by the suction duct 55, which is different from the form of FIG.

  The main body 7 is connected to a blow-out duct 13, an air supply duct 11, and an exhaust duct 9 for conveying air, and a drain pipe 37 for draining condensed water and a power line 56 for supplying power. ing.

  The main body 7 further includes a refrigerant circuit 39 that sequentially connects at least the compressor 40, the flow path switching valve 42, the first heat exchanger 26, the expansion mechanism 41, and the second heat exchanger 29. In order to reduce the height of the main body 7 and to reduce the height of the main body 7, the compressor 40 has two rotors and a horizontal installation specification.

  Further, a vibration isolator 57 is provided to further absorb the vibration of the compressor 40, and the bolt 53 is also provided with a vibration isolator 58 to suppress vibration propagation to the housing of the main body 7.

  FIG. 5 is a schematic configuration diagram of a refrigerant heater that can be employed in the refrigerant heating means 47. As shown in the figure, the refrigerant heater 59 is a refrigerant pipe formed by winding a refrigerant pipe through which a refrigerant is passed in a coil shape. 60, the electric heating pipe 61 formed in a U shape on the inner peripheral side of the coiled refrigerant pipe 60, the inlet and outlet parts 62 and 63 of the refrigerant pipe 60 and the terminal part 64 of the electric pipe 61 are excluded. The heat transfer cylinder 65 is formed in a solid cylindrical shape by casting a metal material such as aluminum so as to cover the entire surface. When a predetermined voltage is applied to the terminal portion 64 of the electric heating tube 61, the electric heating tube 61 generates heat, and this heat is conducted through the heat transfer cylinder 65 to heat the refrigerant pipe 60 disposed on the outer periphery of the electric heating tube 61. To do. Refrigerant is introduced into the refrigerant pipe 60 from the inlet 62, and the refrigerant pipe 60 is heated via the heat transfer cylinder 65 in the course of flowing through the coiled portion covered with the heat transfer cylinder 65. Guided to part 63. In this way, the refrigerant heater 59 heats the refrigerant, but the electric heat pipe 61 arranged at the center of the heat transfer cylinder 65 is connected to the refrigerant pipe 60 arranged in the outer peripheral direction. Since heat is generated, there is little heat leakage to the outside, and heat generated by the electric heat pipe 61 can be conducted through the heat transfer cylinder 65 to uniformly heat the refrigerant pipe 60, thereby improving the heating efficiency and heating the refrigerant. The means 47 can be reduced in size.

  FIG. 6 is a schematic cross-sectional view of a refrigerant-water heat exchanger 66 that can be employed in the refrigerant heating means 47. As shown in the drawing, the refrigerant-water heat exchanger 66 is a hot water supply through which hot water from a hot water supply 67 flows. The heat exchanger has a double pipe structure in which a refrigerant pipe 69 through which a refrigerant flows is arranged inside the pipe 68. The refrigerant pipe 69 is bifurcated inside the hot water supply pipe 68 and is formed in a twisted shape in which each of the branches is spirally twisted, thereby increasing the heat transfer area and improving the heat exchange efficiency. I am trying. The hot water flowing into the refrigerant-water heat exchanger 66 from the hot water inflow part 70 of the hot water supply pipe 68 flows through the outer periphery of the refrigerant pipe 69 and flows out from the hot water supply outflow part 71 to the outside of the refrigerant-water heat exchanger 66. Then, it is dropped on the large drain device 35 below the hot water supply / outflow portion 71. The large drain device 35 also serves as a drain receiver for the drain water condensed on the first heat exchanger 26 and the second heat exchanger 29, and the hot water dropped on the large drain device 35 is supplied to the first heat exchanger 26. The drain water condensed on the second heat exchanger 29 is drained out of the main body 7 through the drain pipe 37 by the drain pump 36. On the other hand, the refrigerant that has flowed into the refrigerant-water heat exchanger 66 from the refrigerant inflow portion 74 of the refrigerant pipe 69 flows into the twisted pipe 75 having a twisted structure in a direction opposite to the flow of the hot water. Thus, it is heated by heat exchange with hot water and flows out from the refrigerant outflow portion 76. The hot water heater 67 used for heating the refrigerant may be a combustion type water heater or a heat pump type hot water heater. However, in the case of the heat pump type, the hot water is boiled using the heat of the atmosphere. The heating efficiency of the means 47 can be further improved and the running cost can be reduced. Further, if the structure is such that the water discharged from the hot water supply / outflow portion 71 is returned to the hot water supply 67, it is possible to supply not the hot water boiled by the hot water supply 67 but the circulating water for heating to the hot water supply pipe 68. . In addition, the hot water supply water can be supplied to the hot water supply pipe 68 as it is, not hot hot water boiled by a hot water heater. In this case, if the flow path switching valve 42 is switched to the cooling cycle side and the on-off valve 46 is set to an open state, the high-temperature and high-pressure refrigerant compressed by the compressor 40 is supplied to the refrigerant circuit 39 and heat exchange with room temperature water is performed. It is also possible to cool the refrigerant in the process.

  Next, the operation of the ventilation air conditioner will be described. FIG. 7 is a list showing operation states in each operation pattern. The list shown in the figure describes each operation pattern of the ventilation air conditioner in order in the column direction, and describes the operation state of the main components in each operation pattern in the row direction. As shown in the table, this ventilation air conditioner is equipped with “heat exchange air operation”, “supply air exhaust operation”, “air supply operation”, “exhaust operation”, “dehumidification operation”, “heating operation”, “cooling operation”. ”,“ Dehumidified heat exchange air operation ”,“ Heating heat exchange air operation ”, and“ Cooling heat exchange air operation ”can be executed.

  "Heat exchange air operation" is a method of exhausting the heat of air conditioned by the air conditioner 18 or the like when supplying fresh outdoor air to the indoor space 1 while exhausting the odor and moisture of the sanitary space 6 rapidly. This is an operation pattern in which heat is collected by the refrigerant, heat is applied to the air supplied from the outside by the refrigerant, and the air is supplied close to the temperature and humidity of the air in the air-conditioned indoor space 1. Is set to a “strong notch” capable of rapid exhaust, and the air path switching adjusting means 31 is set to a “supply / exhaust position” (state shown) in which the exhaust air path 20 and the supply air path 23 are secured. The “strong notch” that can supply the same amount of air as the displacement is also used.

  In addition, the air supply bypass unit 32, the exhaust bypass unit 33, and the dehumidification switching unit 34 are all in a “closed” state, the auxiliary heater 27 and the preheat heater 28 are in a “stopped” state, and the air supply opening / closing device 24 and the exhaust opening / closing device 30 are Set all to “open” status.

  As the refrigerant circuit 39, the compressor 40 is operated at the lowest frequency with very little power consumption, and the flow path switching valve 42 is “heated” in the winter, for example, in the winter, or in the summer due to the difference between the outdoor temperature and the indoor temperature. While maintaining the “cooling” state, the expansion mechanism 41 “adjusts the opening degree” so that the refrigeration cycle is optimized. The second on-off valve 48 is in an “open” state, and no refrigerant passes through the capillary tube 49. The refrigerant heating means 47 is set to the “stopped” state, and the on-off valve 45 and the on-off valve 46 are all set to the “closed” state.

  In this state, for example, in the winter season, when the exhaust fan 14 operates in a “strong notch”, a large amount of air warmed by the air conditioner 18 in the indoor space 1 passes through the undercuts of the hallway and the door. The fins " evaporator " formed by the passage switching valve 42 through the exhaust air passage 20 from the suction port 16 of the grille 15 installed on the ceiling together with the odor and moisture containing the sanitary space 6 The air absorbed by the refrigerant in the tube-type second heat exchanger 29 is exhausted outside through the exhaust opening / closing device 30, the exhaust connection portion 19, the exhaust duct 9, and the exhaust port 8. Then, when the air supply fan 17 is operated with a “strong notch”, outdoor fresh air with a large air volume enters from the air supply port 10, and the air supply duct 11, the air supply connection portion 21 of the main body 7, the air supply In the first heat exchanger 26, which is maintained in the “heating” state by the flow path switching valve 42 through the switch 24, the outdoor filter 25, and the air supply air passage 23, it is compressed and conveyed by the compressor 40. The generated refrigerant becomes warm air by radiating heat to the cold air outside the room including heat absorbed from the air by the second heat exchanger 29 which is an “evaporator”, and passes through the outlet connection part 22 and the outlet duct 13. The air is blown out into the living room 2 from the air outlet 12.

  The refrigerant is discharged at a relatively low pressure and temperature by a compressor 40 operating at the lowest frequency and is discharged with a small amount of circulation, enters the first heat exchanger 26 through the flow path switching valve 42, and enters the second heat exchanger 26. Since the on-off valve 48 is in the “open” state, the entire first heat exchanger 26 dissipates heat to a large amount of air from the outside, lowers the temperature to become a low temperature liquid, and is decompressed by the expansion mechanism 41 to be low pressure and low temperature. The second heat exchanger 29 absorbs heat from the large volume of air in the indoor space 1 to become a low-pressure and low-temperature gas, and returns to the compressor 40 again.

  The moisture of the sanitary space 6 condenses on the fins of the second heat exchanger 29, which is an “evaporator”, flows into the large drain device 35 as condensed water, and the condensed condensed water is drained by the operation of the drain pump 36. It drains from 37 to the outdoor, a drainage mass, etc., or it sprays on the 1st heat exchanger 26 which is a "condenser", and vaporizes and exhausts when the air of the sanitary space 6 is heat-exchanged.

  On the other hand, the heat insulating effect of the heat insulating material 38 around the main body 7 prevents condensation and performance degradation.

  In summer, a large amount of air cooled by the air conditioner 18 in the indoor space 1 enters the main body 7 together with the air containing the odor and moisture in the sanitary space 6, and a “condenser” is In the second heat exchanger 29, the heat is absorbed from the refrigerant and exhausted outside the room. Then, outdoor hot air with a large air volume enters the main body 7 and is radiated to the refrigerant by the first heat exchanger 26 which is maintained in the “cooling” state by the flow path switching valve 42 and becomes an “evaporator”. Chilled air is blown out into the living room 2.

  Thus, the refrigerant is circulated to the first heat exchanger 26 and the second heat exchanger 29 with less power consumption by operating the compressor 40 at the lowest frequency, and the exhaust fan 14 and the supply fan 17 are “strong notch”. As a result of the operation, a large amount of air is exhausted and supplied, and a “heat exchange operation” is performed in which the heat of the exhaust in the indoor space 1 is recovered and radiated to the supplied air.

  Next, the operation during the “supply / exhaust operation” will be described. “Air supply / exhaust operation” is an operation pattern in which an air supply operation is performed to the indoor space 1 while exhausting from the sanitary space 6 while ensuring ventilation airflow according to the Building Standard Law for 24 hours. The exhaust fan 14 is set to a “weak notch” with low power consumption, and the air path switching adjusting means 31 is set to a “supply / exhaust position” (state shown) in which the exhaust air path 20 and the supply air path 23 are secured. The fan 17 is also set to a “weak notch” that can supply an amount of air equivalent to the displacement.

  Further, the air supply bypass unit 32 and the exhaust bypass unit 33 are all set in the “open” state, the dehumidification switching unit 34 is set in the “closed” state, the auxiliary heater 27 and the preheating heater 28 are set in the “stopped” state, and the air supply opening / closing device 24. The exhaust opening / closing devices 30 are all set to the “open” state.

  Since the refrigerant circuit 39 stops the compressor 40 and does not flow the refrigerant, the flow path switching valve 42, the expansion mechanism 41, the second on-off valve 48, the refrigerant heating means 47, the on-off valve 45, and the on-off valve 46 are all used. Set to “Stop” state.

  In this state, for example, in the middle of spring or autumn, when the exhaust fan 14 is operated with a “weak notch”, the air in the indoor space 1 including VOCs generated from building materials, furniture, and the like is transferred to the hallways and doors. The exhaust opening and closing device 30 passes through the undercut, passes through the exhaust air passage 20 from the suction port 16 of the grill 15 installed on the ceiling of the sanitary space 6, and mainly passes through the exhaust bypass means 33 in the "open" state. Exhaust air is exhausted through the exhaust connection portion 19, the exhaust duct 9, and the exhaust port 8. Then, when the air supply fan 17 is operated with a “weak notch”, fresh outdoor air enters from the air supply port 10, and the air supply duct 11, the air supply connection portion 21 of the main body 7, the air supply opening / closing device 24, The air passes through the outdoor filter 25 and the air supply passage 23, passes mainly through the air supply bypass means 32 in the “open” state, passes through the outlet connection portion 22 and the outlet duct 13, and is blown out from the outlet 12 to the living room 2. The

  Thus, by operating the exhaust fan 14 and the air supply fan 17 with “weak notch”, the air in the indoor space 1 with a small amount of air is exhausted and the outdoor air is supplied with very little power consumption. Driving "will be performed.

  Next, the operation during the “air supply operation” will be described. “Air supply operation” is an operation pattern in which only the air supply operation is performed in the indoor space 1 when the outdoor temperature and humidity are more comfortable than the indoor temperature or when the outdoor cleanliness is higher than the indoor cleanliness. During this operation, the exhaust fan 14 is stopped, the air path switching adjusting means 31 is set to the “supply / exhaust position” (state shown) in which the exhaust air path 20 and the air supply path 23 are secured, and the air supply fan 17. Operate with “low notch” with low power consumption.

  Further, the air supply bypass unit 32 and the exhaust bypass unit 33 are all set in the “open” state, the dehumidification switching unit 34 is set in the “closed” state, the auxiliary heater 27 and the preheating heater 28 are set in the “stopped” state, and the air supply opening / closing device 24. The exhaust opening / closing devices 30 are all set to the “open” state.

  Since the refrigerant circuit 39 stops the compressor 40 and does not flow the refrigerant, the flow path switching valve 42, the expansion mechanism 41, the second on-off valve 48, the refrigerant heating means 47, the on-off valve 45, and the on-off valve 46 are all used. Set to “Stop” state.

  In this state, for example, in the middle of spring or autumn, when the air supply fan 17 operates in a “weak notch”, fresh outdoor air enters from the air inlet 10, and the air supply duct 11 and the main body 7 are supplied. The air connection 21, the air supply opening / closing device 24, the outdoor filter 25, and the air supply air passage 23 are passed through the air supply bypass means 32 that is in the “open” state, through the air outlet connection 22 and the air outlet duct 13. Then, the air is blown out from the outlet 12 to the living room 2.

  Thus, by operating the air supply fan 17 with the “weak notch”, “air supply operation” is performed in which a small amount of outdoor air is supplied with very little power consumption.

  Next, the operation during “exhaust operation” will be described. The “exhaust operation” is an operation pattern in which only the exhaust operation of the sanitary space 6 is performed when the environment of the indoor space 1 is not significantly changed. During this operation, the air supply fan 17 is stopped and the air path switching adjustment is performed. The means 31 is set to the “supply / exhaust position” (state shown) in which the exhaust air passage 20 and the supply air passage 23 are secured, and the exhaust fan 14 is operated in a “weak notch” operation with low power consumption.

  Further, the air supply bypass unit 32 and the exhaust bypass unit 33 are all set in the “open” state, the dehumidification switching unit 34 is set in the “closed” state, the auxiliary heater 27 and the preheating heater 28 are set in the “stopped” state, and the air supply opening / closing device 24. The exhaust opening / closing devices 30 are all set to the “open” state.

  Since the refrigerant circuit 39 stops the compressor 40 and does not flow the refrigerant, the flow path switching valve 42, the expansion mechanism 41, the second on-off valve 48, the refrigerant heating means 47, the on-off valve 45, and the on-off valve 46 are all used. Set to “Stop” state.

  In this state, for example, in the middle of spring or autumn, when the exhaust fan 14 is operated with a “weak notch”, the air in the indoor space 1 including VOCs generated from building materials, furniture, and the like is transferred to the hallways and doors. The exhaust opening and closing device 30 passes through the undercut, passes through the exhaust air passage 20 from the suction port 16 of the grill 15 installed on the ceiling of the sanitary space 6, and mainly passes through the exhaust bypass means 33 in the "open" state. Exhaust air is exhausted through the exhaust connection portion 19, the exhaust duct 9, and the exhaust port 8.

  Thus, by operating the exhaust fan 14 with “weak notch”, “exhaust operation” in which the air in the sanitary space 6 with a small amount of air is exhausted with very little power consumption is performed.

  Next, the operation during the “dehumidifying operation” will be described. The “dehumidifying operation” is an operation pattern selected when the indoor space 1 is reheated and dehumidified in order to improve the comfort of living moisture due to high humidity in the rainy season or housework, and to suppress mold on the wall surface. When this “dehumidifying operation” is executed, the exhaust fan 14 is stopped, and the air path switching adjusting means 31 is set to the “supply / exhaust position” (state shown) in which the exhaust air path 20 and the supply air path 23 are secured. Then, the dehumidification switching means 34 is set to the “open” state in which the exhaust air passage 20 and the air supply air passage 23 are communicated, and the air supply opening / closing device 24 and the exhaust air opening / closing device 30 are all set to the “closed” state. Strong notch ”.

  Further, the air supply bypass unit 32 and the exhaust bypass unit 33 are all set in a “closed” state, and the auxiliary heater 27 and the preheat heater 28 are set in a “stopped” state.

  As the refrigerant circuit 39, the compressor is operated at a frequency adjusted by the temperature and humidity of the intake air in the indoor space 1, the flow path switching valve 42 is kept in the "heating" state, and the expansion mechanism 41 has the optimum refrigeration cycle. As described above, the “opening adjustment” is performed. The second on-off valve 48 is in an “open” state, and no refrigerant passes through the capillary tube 49. The refrigerant heating means 47 is set to the “stopped” state, and the on-off valve 45 and the on-off valve 46 are all set to the “closed” state.

  In this state, since the exhaust opening / closing device 30 and the air supply opening / closing device 24 are all in the “closed” state and the dehumidification switching means 34 is in the “open” state, the air supply fan 17 is operated in the “strong notch”. Then, the exhaust air passage 20 becomes negative pressure, and a large amount of air containing a large amount of moisture in the indoor space 1 passes through the undercuts of the hallways and doors, and the grill 15 installed on the ceiling together with the air in the sanitary space 6 It flows into the exhaust air passage 20 from the suction port 16. Thereafter, the refrigerant is endothermic and dehumidified by the fin-and-tube second heat exchanger 29 that becomes an “evaporator” by the flow path switching valve 42, flows into the supply air passage 23, and becomes the “condenser”. The air that has been heated and dehumidified by the heat exchanger 26 is warmed, and blown out from the blowout opening 12 to the living room 2 through the blowout connection portion 22 and the blowout duct 13.

  The refrigerant is discharged as a gas having an appropriately high pressure and temperature by the compressor 40 operating at an appropriate frequency, passes through the flow path switching valve 42, enters the first heat exchanger 26, and enters the second on-off valve. Since 48 is in an “open” state, in the first heat exchanger 26 portion, the low-temperature liquid is radiated to the large amount of air from the indoor space 1 that has become low-temperature and low-humidity in the second heat exchanger 29 to lower the temperature. Further, the pressure is reduced by the expansion mechanism 41 to be in a low-pressure and low-temperature two-phase state, and in the second heat exchanger 29 part, heat is absorbed from a large amount of air in the indoor space 1 to become a low-pressure and low-temperature gas. Return to the compressor 40 again.

  The moisture of the sanitary space 6 condenses on the fins of the second heat exchanger 29, which is an “evaporator”, flows into the large drain device 35 as condensed water, and the condensed condensed water is drained by the operation of the drain pump 36. Drain from 37 to the outside or drainage mass.

  On the other hand, the heat insulating effect of the heat insulating material 38 around the main body 7 prevents condensation and performance degradation.

  Thus, by operating the compressor 40 at an appropriate frequency, the refrigerant circulates to the first heat exchanger 26 and the second heat exchanger 29, and the exhaust opening / closing device 30 and the supply air opening / closing device 24 are all in the “closed” state. In addition, by operating the air supply fan 17 in the “strong notch” while the dehumidification switching unit 34 is in the “open” state, the large air volume recovers the heat at the time of dehumidification of the indoor space 1 and reheats it. "Dehumidifying operation" will be performed.

  Next, the operation during the “heating operation” will be described. “Heating operation” is an operation pattern selected when the indoor space 1 is heated in winter or the like to improve comfort or reduce the heating load of the air conditioner 18. During this operation, the air passage switching adjustment means 31 is supplied to the exhaust air passage 20 and the supply air passage 23 from the outside through the first heat exchanger 26, and the exhaust in the indoor space 1 passes through the second heat exchanger 29. The “heating / cooling position” is set so as to pass, the exhaust fan 14 is set to “strong notch”, and the air supply fan 17 is also set to “strong notch” operation.

  In addition, the air supply bypass unit 32, the exhaust bypass unit 33, and the dehumidification switching unit 34 are all in a “closed” state, the auxiliary heater 27 and the preheat heater 28 are in a “stopped” state, and the air supply opening / closing device 24 and the exhaust opening / closing device 30 are Set all to “open” status.

  As the refrigerant circuit 39, the compressor 40 is operated while adjusting the frequency according to the temperature of the indoor space 1 or the outdoor air, the flow path switching valve 42 is maintained in the “heating” state, and the expansion mechanism 41 has an optimal refrigeration cycle. "Opening adjustment" is performed each time so that The second on-off valve 48 is in an “open” state, and no refrigerant passes through the capillary tube 49. The refrigerant heating means 47 is set to the “stopped” state, and the on-off valve 45 and the on-off valve 46 are all set to the “closed” state.

  In this state, when the exhaust fan 14 is operated with a “strong notch”, a large amount of air in the indoor space 1 passes through the undercuts of the hallway and doors and is installed on the ceiling together with the air in the sanitary space 6. The fin and tube type that has become a “condenser” by the flow path switching valve 42 by the air path switching adjustment means 31 set to the “heating / cooling position” through the exhaust air path 20 from the suction port 16 of the grill 15. In the first heat exchanger 26, the air radiated to the refrigerant compressed and conveyed by the compressor 40 is blown out from the outlet 12 to the living room 2 through the outlet connection portion 22 and the outlet duct 13. When the air supply fan 17 is operated with a “strong notch”, a large amount of outdoor air enters from the air supply port 10, and the air supply duct 11, the air supply connection portion 21 of the main body 7, and the air supply opening / closing device 24. The air passage switching adjusting means 31 set to the “heating / cooling position” passes through the outdoor filter 25 and the supply air passage 23, and is maintained in the “heating” state by the flow passage switching valve 42. In the second heat exchanger 29, the refrigerant absorbs heat and is exhausted to the outside through the exhaust opening / closing device 30, the exhaust connection portion 19, the exhaust duct 9, and the exhaust port 8.

  The refrigerant is discharged as a gas having a high pressure and temperature by the compressor 40 operating at an appropriate frequency, enters the first heat exchanger 26 through the flow path switching valve 42, and the second on-off valve 48 is “ Because of the "open" state, the first heat exchanger 26 as a whole dissipates heat to a large amount of air from the indoor space 1 to lower the temperature to become a low-temperature liquid, which is decompressed by the expansion mechanism 41 and is low-pressure low-temperature two-phase In this state, the second heat exchanger 29 absorbs heat from the air with a large air volume outside to become a low-pressure and low-temperature gas, and returns to the compressor 40 again.

  The outdoor heat is condensed on the fins of the second heat exchanger 29 which is an “evaporator” and flows into the large drain device 35 as dew condensation water, and the accumulated dew condensation water is discharged from the drain pipe 37 by the operation of the drain pump 36. It drains to the outdoors, a drainage mass, etc., or it sprays on the 1st heat exchanger 26 which is a "condenser", it vaporizes when heat-exchanging the air of the indoor space 1, and humidifies it while heating.

  On the other hand, the heat insulating effect of the heat insulating material 38 around the main body 7 prevents condensation and performance degradation.

  Thus, by operating the compressor 40 at an appropriate frequency, the refrigerant circulates to the first heat exchanger 26 and the second heat exchanger 29, and the air path switching adjusting means 31 is held at the “heating / cooling position”. By operating the exhaust fan 14 and the air supply fan 17 with a “strong notch”, a large amount of air is warmed and a “heating operation” for heating the indoor space 1 is performed.

  Furthermore, it is possible to switch the operation / stop of the auxiliary heater 27 according to the user's preference. For example, when the user feels a draft feeling and sets the air volume of the air supply fan 17 to be reduced, the draft feeling is reduced, but the heat release amount of the refrigerant is also reduced as the air volume supplied to the first heat exchanger 26 is reduced. As a result, the temperature of the indoor space 1 is lowered and the feeling of comfort is impaired. When the auxiliary heater 27 is operated in such a case, the air that has passed through the first heat exchanger 26 is further heated by the auxiliary heater 27 to become a high temperature and is supplied to the indoor space 1, so that a temperature drop is suppressed.

  In addition, when the outdoor temperature in winter is very low, the temperature of the outdoor air supplied to the second heat exchanger 29 by the exhaust fan 14 is also low, so the second heat exchanger is being executed during the above-described “heating operation”. A frosting phenomenon in which frost adheres to 29 occurs. If this frosting state is left as it is, the amount of heat released from the first heat exchanger 26 decreases due to a decrease in the heat absorption capability of the second heat exchanger 29, and the indoor space 1 cannot be sufficiently heated. . In order to suppress such a problem, the temperature of the refrigerant pipe of the second heat exchanger 29 is monitored by the coil temperature sensor 52 during the “heating operation”, and the second heat exchange is performed when the temperature falls below a predetermined value. It is necessary to execute “defrosting operation 1” for removing frost adhering to the container 29. Next, the operation during the “defrosting operation 1” will be described.

  When performing the defrosting operation during the heating operation, the exhaust fan 14 that has been operated with the “strong notch” and the air supply fan 17 that has been operated with the “predetermined notch” are respectively stopped and set to “heating”. The flow path switching valve 42 that has been switched is switched to “cooling”. By performing such setting, the high-temperature and high-pressure refrigerant compressed by the compressor 40 is guided to the second heat exchanger 29 through the flow path switching valve 42 switched to cooling. When this high-temperature refrigerant flows through the refrigerant pipe of the second heat exchanger 29, the pipe temperature rises and frost adhering to the surface is dissolved. The melted frost is drained and dripped into the large drain device 35 and drained to the outside or a drainage mass through the drain pump 36 and the drain pipe 37. On the other hand, the refrigerant that dissipates heat in the second heat exchanger 29 and melts the frost flows in order through the expansion mechanism 41, the first heat exchanger 26, and the flow path switching valve 42, returns to the compressor 40, and circulates through the refrigerant circuit 39. . If this “defrosting operation 1” is continued, the frost adhering to the second heat exchanger 29 is melted and the piping temperature rises. The pipe temperature is continuously monitored by the coil temperature sensor 52, and when the pipe temperature rises to a predetermined value or more, the “defrosting operation 1” is switched to the “heating operation” again. Then, the exhaust fan 14 that has been stopped is started to operate with a “strong notch”, and the temperature of the refrigerant is monitored by the coil temperature sensor 51 provided in the liquid side piping of the first heat exchanger 26, so that the temperature exceeds a certain temperature. If this happens, the air supply fan 17 also starts operation at the “predetermined notch”. Thereby, it becomes possible to perform sufficient heating while suppressing an extreme decrease in heating capacity at low temperatures.

  When the outdoor temperature is extremely low or the necessity of defrosting occurs when the temperature of the indoor space 1 is low, the heating operation is temporarily stopped and switched to the defrosting operation as in “defrosting operation 1”. Therefore, a defrosting operation for removing the frost attached to the second heat exchanger 29 while continuing the heating operation is required instead of the switching operation for removing the frost. Next, the operation of the “defrosting operation 2” will be described.

  In the operation of “defrosting operation 2”, the exhaust fan 14, the air supply fan 17, the compressor 40, the flow path switching valve 42, the second opening / closing valve 48 and the like all continue to operate during the heating operation. In addition, the on-off valve 46 is switched from the “closed state” to the “open state”, the electronic expansion valve of the expansion mechanism 41 is set to the fully closed state, and the preheating heater 28 and the refrigerant heating means 47 are operated. By switching to such a setting, the high-temperature and high-pressure refrigerant compressed by the compressor 40 passes through the flow path switching valve 42 set to heating, and the on-off valve 45 is switched to the open state. The current is diverted to the heat exchanger 26 side and the bypass circuit 43 side. The refrigerant diverted to the first heat exchanger 26 side radiates heat to the air in the indoor space 1 supplied by the air supply fan 17, and the air heated by the heat radiated from the refrigerant circulates in the indoor space 1 for heating operation. Will continue. On the other hand, the refrigerant that has radiated heat to the supply air in the first heat exchanger 26 is completely bypassed because the electronic expansion valve that is the expansion mechanism 41 is fully closed and the on-off valve 46 that is interposed in the bypass circuit 44 is open. It flows into the circuit 44 and flows into the refrigerant heating means 47. As described above, the refrigerant heating means 47 is provided with the refrigerant heating heater 59 or the refrigerant-water heat exchanger 66. In the refrigerant heating means 47, the refrigerant is heated and an endothermic operation is performed. On the other hand, the high-temperature and high-pressure refrigerant discharged from the compressor 40 and diverted to the bypass circuit 43 side flows into the second heat exchanger 29. Since the exhaust fan 14 is operated with a strong notch to the second heat exchanger 29, outdoor air is supplied through the air supply port 10 and the air supply duct 11. The supplied air is heated by the preheating heater 28 located on the upstream side of the second heat exchanger 29 and is supplied to the second heat exchanger 29 at a high temperature. Therefore, in the second heat exchanger 29, since the high-temperature refrigerant flows through the refrigerant pipe and the surface to which frost is attached is supplied with high-temperature air heated by the preheating heater 28, the second heat exchanger 29 The frost adhering to is quickly removed. The refrigerant that has melted frost in the second heat exchanger 29 merges with the refrigerant heated by the refrigerant heating means 47, returns from the flow path switching valve 42 to the compressor 40, and is supplied to the second heat exchanger 29. After giving heat to the attached frost, the air is discharged from the exhaust duct 9 to the outside of the room. In this way, it is possible to defrost the second heat exchanger 29 while continuing the heating operation of the indoor space 1. The stage where the pipe temperature of the second heat exchanger 29 has risen to a predetermined value or more is monitored by the coil temperature sensor 52. When the temperature rises above a certain temperature, that is, when the frost removal is completed, the normal heating operation is resumed. By returning, continuous heating operation is possible without impairing the user's comfort.

  Next, the operation during “cooling operation” will be described. “Cooling operation” is an operation pattern that is selected when the user cools the indoor space 1 at a high temperature such as in summer so that the user can comfortably spend time or when the cooling load of the air conditioner 18 is reduced. When this “cooling operation” is executed, the air passage switching adjustment means 31 is supplied to the exhaust air passage 20 and the air supply air passage 23 from the outside through the first heat exchanger 26, and the exhaust in the indoor space 1 is the first exhaust air. The “heating / cooling position” is set so as to pass through the two heat exchangers 29, the exhaust fan 14 is set to “strong notch”, and the air supply fan 17 is also set to “strong notch” operation.

  In addition, the air supply bypass unit 32, the exhaust bypass unit 33, and the dehumidification switching unit 34 are all in a “closed” state, the auxiliary heater 27 and the preheat heater 28 are in a “stopped” state, and the air supply opening / closing device 24 and the exhaust opening / closing device 30 are Set all to “open” status.

  As the refrigerant circuit 39, the compressor 40 is operated while adjusting the frequency according to the temperature of the indoor space 1 or the outdoor air, the flow path switching valve 42 is maintained in the “cooling” state, and the expansion mechanism 41 has an optimal refrigeration cycle. "Opening adjustment" is performed each time so that The second on-off valve 48 is in an “open” state, and no refrigerant passes through the capillary tube 49. The refrigerant heating means 47 is set to the “stopped” state, and the on-off valve 45 and the on-off valve 46 are all set to the “closed” state.

  In this state, when the air supply fan 17 operates with a “strong notch”, a large amount of outdoor air enters through the air supply port 10, and the air supply duct 11, the air supply connection portion 21 of the main body 7, and the air supply open / close The air passage switching adjusting means 31 set to the “heating / cooling position” passes through the device 24, the outdoor filter 25, and the air supply air passage 23, and is held in the “cooling” state by the flow passage switching valve 42. The fin and tube-type second heat exchanger 29 becomes a “heater” and absorbs the heat of the refrigerant compressed and conveyed by the compressor 40, and the exhaust opening / closing device 30, the exhaust connection portion 19, the exhaust duct 9, and the exhaust port 8. It is exhausted through the room. Then, when the exhaust fan 14 is operated with a “strong notch”, a large amount of air in the indoor space 1 passes through the undercut of the hallway and the door, and the grill 15 installed on the ceiling together with the air in the sanitary space 6. The first heat exchanger 26 that has become an “evaporator” by the flow path switching valve 42 by the air path switching adjusting means 31 set to the “heating / cooling position” through the exhaust air path 20 from the suction port 16. Thus, the air absorbed by the refrigerant and cooled is blown out from the outlet 12 to the living room 2 through the outlet connecting portion 22 and the outlet duct 13.

  The refrigerant is discharged as a gas having a high pressure and temperature by the compressor 40 operating at an appropriate frequency, enters the second heat exchanger 29 through the flow path switching valve 42, and has a large air volume outside. The heat is released to lower the temperature to become a low-temperature liquid, which is decompressed by the expansion mechanism 41 to a low-pressure low-temperature two-phase state, and the second on-off valve 48 is in the “open” state, so the first heat exchanger 26 As a whole, heat is absorbed from a large amount of air from the indoor space 1 to increase the temperature to become a low-pressure and low-temperature gas, and return to the compressor 40 again through the flow path switching valve 42.

  The moisture of the indoor space 1 condenses on the fins of the first heat exchanger 26 that is an “evaporator” and flows into the large drain device 35 as condensed water, and the accumulated condensed water is drained by the operation of the drain pump 36. It drains from 37 to the outdoor, a drainage mass, etc., or it sprays on the 2nd heat exchanger 29 which is a "condenser", and it vaporizes and exhausts when the outdoor air is heat-exchanged.

  On the other hand, the heat insulating effect of the heat insulating material 38 around the main body 7 prevents condensation and performance degradation.

  Thus, by operating the compressor 40 at an appropriate frequency, the refrigerant circulates in the second heat exchanger 29 and the first heat exchanger 26, and the air path switching adjusting means 31 is held at the “heating / cooling position”. By operating the exhaust fan 14 and the air supply fan 17 with a “strong notch”, a large amount of air is cooled, and a “cooling operation” for cooling the indoor space 1 is performed.

  Next, the operation during the “dehumidification heat exchange air operation” will be described. The “dehumidification heat exchange air operation” is a method of rapidly exhausting the odor and moisture of the sanitary space 6 while the fresh air outside is being supplied to the indoor space 1 to heat the air conditioned by the air conditioner 18 or the like. While recovering into the refrigerant during exhaust and adding heat to the air supplied from the outside with the refrigerant, the air is supplied to improve comfort in daily humidity during the rainy season and housework, and to suppress mold on the walls, etc. Therefore, this is an operation pattern in which the indoor space 1 is reheated and dehumidified.

  During this operation, the air passage switching adjustment means 31 is supplied to the exhaust air passage 20 and the supply air passage 23 from the outside through the first heat exchanger 26, and the exhaust in the indoor space 1 passes through the second heat exchanger 29. While adjusting the opening degree between the “heating / cooling position” and the “supply / exhaust position” (state shown) in which the exhaust air passage 20 and the supply air passage 23 are secured, the exhaust fan 14 is The “strong notch” and the air supply fan 17 are also operated in “strong notch” to adjust the outdoor air flow rate and the air flow rate of the indoor space 1 passing through the first heat exchanger 26 and the second heat exchanger 29, respectively.

  In addition, the air supply bypass unit 32, the exhaust bypass unit 33, and the dehumidification switching unit 34 are all in a “closed” state, the auxiliary heater 27 and the preheat heater 28 are in a “stopped” state, and the air supply opening / closing device 24 and the exhaust opening / closing device 30 are Set all to “open” status.

  As the refrigerant circuit 39, the compressor 40 is operated while adjusting the frequency according to the temperature and humidity of the indoor space 1 and outdoor air, the flow path switching valve 42 is kept in the “heating” state, and the expansion mechanism 41 is “fully open”. And The second on-off valve 48 is in a “closed” state to reduce the pressure through the refrigerant through the capillary tube 49, and use the upstream side of the capillary tube 49 of the first heat exchanger 26 as a “condenser” and the downstream side as an “evaporator”. . The refrigerant heating means 47 is set to the “stopped” state, and the on-off valve 45 and the on-off valve 46 are all set to the “closed” state.

  In this state, when the air supply fan 17 operates in a “strong notch”, a large amount of air in the indoor space 1 passes through the undercuts of the hallways and doors and is installed on the ceiling together with the air in the sanitary space 6. A large amount of outdoor air passes from the suction port 16 of the grill 15 through the exhaust air passage 20 and passes through the air supply duct 11 by the air passage switching adjustment means 31 set to “opening adjustment”. Each air volume is adjusted and merged, set to “heating” by the flow path switching valve 42, and dehumidified in the downstream portion of the capillary tube 49 of the fin-and-tube type first heat exchanger 26 that has become an “evaporator”. Then, it is reheated at a portion upstream of the capillary tube 49 of the first heat exchanger 26 that has become a “condenser”, and blows out from the outlet 12 to the living room 2 through the outlet connection portion 22 and the outlet duct 13. It is.

  Then, when the exhaust fan 14 operates with a “strong notch”, a large amount of outdoor air enters from the air supply port 10, and the air supply duct 11, the air supply connection portion 21 of the main body 7, the air supply opening / closing device 24, An air passage set to “opening adjustment” through the outdoor filter 25 and the air supply air passage 23, and a large amount of air in the indoor space 1 through the exhaust air passage 20 from the suction port 16 of the grill 15. Each air volume is adjusted by the switching adjustment means 31 and merged, and the refrigerant is absorbed by the refrigerant in the second heat exchanger 29 which is held in the “heating” state by the flow path switching valve 42 and becomes an “evaporator”, and opens and closes the exhaust. The air is exhausted outside the room through the device 30, the exhaust connection part 19, the exhaust duct 9 and the exhaust port 8.

  The refrigerant is discharged as a gas having a high pressure and temperature by the compressor 40 operating at an appropriate frequency, enters the first heat exchanger 26 through the flow path switching valve 42, and the second on-off valve 48 is “ In the upstream portion of the capillary tube 49 of the first heat exchanger 26 because of the “closed” state, heat is released to the large volume of air from the indoor space 1 and the outside, and the temperature is lowered to a medium-low temperature two-phase state. The pressure is reduced in the tube 49 to become a two-phase state of medium to low pressure and medium to low temperature, and in the downstream portion of the capillary tube 49 of the first heat exchanger 26, the same air absorbs a little heat and becomes a two-phase state of medium to low pressure to medium and low temperature. Since the decompression mechanism 41 is “fully open”, the decompression mechanism 41 is slightly decompressed and enters the second heat exchanger 29, which is an “evaporator”, and further absorbs heat from a large amount of air from the outdoor and indoor space 1 to form a low-pressure, low-temperature gas. And return to the compressor 40 again

  A large drain device 35 is formed by condensing the indoor space 1 and the outdoor moisture into the dew condensation water on the downstream portion of the capillary tube 49 of the first heat exchanger 26 that is an “evaporator” and the fins of the second heat exchanger 29. Condensed water that has flowed down and accumulated is drained from the drain pipe 37 to the outside, to a drainage mass or the like by the operation of the drain pump 36.

  On the other hand, the heat insulating effect of the heat insulating material 38 around the main body 7 prevents condensation and performance degradation.

  Thus, by operating the compressor 40 at an appropriate frequency, the refrigerant flows into the upstream portion of the first heat exchanger 26 from the capillary tube 49 and the capillary tube 49, the downstream portion from the capillary tube 49, and the second heat exchanger 29. It circulates, keeps the air path switching adjusting means 31 at “opening degree adjustment”, and operates the exhaust fan 14 and the air supply fan 17 with “strong notch”, thereby recovering the heat of the indoor space 1 and reheat dehumidification. Then, the “dehumidifying heat exchange operation” for exhausting the sanitary space 6 and supplying the outdoor air is performed.

  Next, the operation operation at the time of “heating heat exchange air operation” will be described. “Heating heat exchange air operation” is a method of rapidly exhausting the odors and moisture of the sanitary space 6 while supplying fresh outdoor air to the indoor space 1 to heat the air conditioned by the air conditioner 18 or the like. In order to improve comfort in winter or to reduce the heating load of the air conditioner 18 while collecting air in the refrigerant during exhaust and adding heat to the air supplied from the outside by the refrigerant, the indoor space 1 It is the driving pattern which heats.

  During this operation, the air passage switching adjustment means 31 is supplied to the exhaust air passage 20 and the supply air passage 23 from the outside through the first heat exchanger 26, and the exhaust in the indoor space 1 passes through the second heat exchanger 29. While adjusting the opening degree between the “heating / cooling position” and the “supply / exhaust position” (state shown) in which the exhaust air passage 20 and the supply air passage 23 are secured, the exhaust fan 14 is The “strong notch” and the air supply fan 17 are also operated in the “strong notch” operation to adjust the outdoor air volume passing through the first heat exchanger 26 and the second heat exchanger 29 and the air volume in the indoor space 1 respectively. Except for this, the operation pattern is the same as that of the “heating operation”.

  Next, the operation during the “cooling heat exchange operation” will be described. “Cooling heat exchanging air operation” is a method in which the odor and moisture of the sanitary space 6 are rapidly exhausted and the air conditioned by the air conditioner 18 or the like is supplied when fresh outdoor air is supplied to the indoor space 1. In order to improve the comfort in summer or to reduce the cooling load of the air conditioner 18 while collecting the refrigerant in the refrigerant at the time of exhaust and absorbing the air supplied from the outside with the refrigerant to supply air, This is an operation pattern for cooling.

  During this operation, the air passage switching adjustment means 31 is supplied to the exhaust air passage 20 and the supply air passage 23 from the outside through the first heat exchanger 26, and the exhaust in the indoor space 1 passes through the second heat exchanger 29. While adjusting the opening degree between the “heating / cooling position” and the “supply / exhaust position” (state shown) in which the exhaust air passage 20 and the supply air passage 23 are secured, the exhaust fan 14 is The “strong notch” and the air supply fan 17 are also operated in the “strong notch” operation to adjust the outdoor air volume passing through the first heat exchanger 26 and the second heat exchanger 29 and the air volume in the indoor space 1, respectively. Is the same as the operation pattern of “cooling operation”.

  With the configuration and operation described above, the ventilation air conditioner of the present embodiment has the following effects.

  Heat is transferred by the refrigerant between the first heat exchanger 26 and the second heat exchanger 29, and the air in the bathroom 3 is exhausted by the exhaust fan 14, while the outdoor air is warmed or cooled to supply air to the indoor space 1. By supplying air with the fan 17, outdoor air that is not air-conditioned does not flow into the indoor space 1, improving comfort, generating mold due to condensation near the natural air inlet, and dirt on the wall surface due to dust from outdoor air, etc. Can be prevented. Further, the heat exchange between the air and the refrigerant in the heat exchanger can achieve a total energy saving including the running cost of the air conditioner 18, and the ventilation air volume can be increased by reducing the pressure loss of the heat exchanger.

  Further, the amounts of outdoor air and sanitary air passing through the first heat exchanger 26 and the second heat exchanger 29 are adjusted by the air path switching adjusting unit 31 to adjust the indoor and outdoor temperatures and humidity, and the indoor air. By adjusting the balance of the amount of circulating air, exhaust, and supply air according to environmental conditions such as the degree of dirt, the air can be supplied to the indoor space 1 while ventilating the sanitary space 6, and air conditioning can be performed with energy saving.

  Further, during ventilation, the air supply bypass means 32 and the exhaust bypass means 33 of the first heat exchanger 26 and the second heat exchanger 29 are opened, and part of the outdoor air and sanitary air is transferred to the first heat exchanger 26 and the second heat exchanger 29. By supplying and exhausting the indoor space 1 and the outside without passing through the two heat exchangers 29, the supply of air to the indoor space 1 and the exhaust of the sanitary space 6 are performed with lower power even with the same air supply / exhaust air volume. be able to.

  Further, after the air sucked from the sanitary space 6 is cooled by the second heat exchanger 29, the air is reheated by the first heat exchanger 26, and the air path is switched so as to blow out into the indoor space 1. It is possible to dehumidify while reducing the temperature change of the indoor space 1 while reducing the outflow of heat to the interior.

  Further, the heating operation and the cooling operation of the indoor space 1 can be switched by switching the flow direction of the refrigerant with the flow path switching valve 42.

  Further, after the air sucked from the outside is cooled on the downstream side of the decompression means 50 of the first heat exchanger 26, it is reheated on the upstream side of the decompression means 50 and blown out into the indoor space 1. While fresh outdoor air is introduced into the indoor space 1, it can be dehumidified without excessively reducing the temperature of the indoor space 1.

  Further, when air-conditioning the indoor space 1, the capacity of heat recovery can be increased by increasing the air volume of the air supply fan 17 or the exhaust fan 14 compared with the case where the sanitary space 6 is ventilated. Can be ventilated and air conditioned.

  In addition, since air conditioned by the air conditioner 18 installed outside the sanitary space 6 enters through the suction port 16 of the sanitary space 6 and recovers heat of the air, the air conditioner 18 is more efficient than the present ventilation air conditioner 18. Since the heat of the blown air is used, it is possible to reduce the size of the heat exchanger in the main body 7 and save energy during the air conditioning operation.

  In addition, the large drain device 35 disposed below the supply air passage 23 and the exhaust air passage 20 can surely treat the condensed water generated in the air passage, and the heat exchanger has a single condensate drain. Therefore, the workability can be improved, and the flow of water to the drain outlet can be smoothed by increasing the amount of water, thereby preventing the generation of bacteria due to the accumulated water.

  Further, by operating the drain pump 36, condensed water or condensed water can be drained to a place higher than the large drain device 35, and the construction can be performed even when the space behind the ceiling is narrow and the drain gradient cannot be taken.

  Further, by heat-insulating the periphery of the supply air passage 23 and the exhaust air passage 20 with a heat insulating material 38, heat leakage is prevented while preventing condensation on the outer body 7 of the ventilation air conditioner, thereby further saving energy. Can be improved.

  Further, the compressor 40, the first heat exchanger 26, the expansion mechanism 41, and the second heat exchanger 29 constituting the refrigerant circuit 39 are all housed inside the main body 7 of the ventilation air conditioner installed in the ceiling of the bathroom 3 or the like. By doing so, it is possible to save space and improve workability.

  Further, by heating at least a part of the air blown by the air supply fan 17 by the auxiliary heater 27, it is possible to compensate for the lack of heating capacity in a low temperature environment.

  Moreover, by preheating the air before being supplied to the second heat exchanger 29 by the preheating heater 28, it is possible to suppress a reduction in heating capacity in a low temperature environment and frost formation on the second heat exchanger 29, Moreover, the attached frost can be removed.

  In addition, when frost adheres to the first heat exchanger 26 or the second heat exchanger 29 at a low temperature, it adheres by switching the flow path switching valve 42 based on the refrigerant temperature monitored by the coil temperature sensors 51 and 52. Defrosting can be performed.

  Further, when frost adheres to the second heat exchanger 29 at a low temperature, the high-pressure side and the low-pressure side of the refrigerant circuit 39 are opened through the bypass circuits 43 and 44, and the high-temperature refrigerant is circulated to the second heat exchanger 29. By increasing the refrigerant pressure in the second heat exchanger 29, the attached frost can be removed.

  Further, the refrigerant heating means 47 is interposed in the refrigerant circuit 39 so as to be in series or in parallel with the second heat exchanger 29, and when the heat absorption capability is reduced, for example, frost adheres to the second heat exchanger 29, the refrigerant By operating the heating means 47, heat absorption capability can be ensured and heating capability can be maintained.

  Further, by using a refrigerant heater 59 that heats the refrigerant by electric heat as the refrigerant heating means 47, the refrigerant heating means 47 can be downsized.

  Further, by using the refrigerant-water heat exchanger 66 that heats the refrigerant by exchanging heat with the hot water of the hot water supply 67 for the refrigerant heating means 47, the amount of power used in the refrigerant heating means 47 can be reduced. .

  Moreover, the amount of electric power used by the refrigerant heating means 47 can be further reduced by using hot water boiled by a heat pump type hot water heater as hot water supplied to the refrigerant-water heat exchanger 66.

  Moreover, when draining the hot water after heat-exchange with a refrigerant | coolant with the refrigerant | coolant-water heat exchanger 66, the drainage path which drains the dew condensation water produced in the 1st heat exchanger 26 or the 2nd heat exchanger 29 By using, construction can be simplified without increasing the number of drainage paths.

  In addition, when the heat dissipating capacity is insufficient at high temperatures such as in summer, the refrigerant dissipates heat to room temperature water supplied to the refrigerant-water heat exchanger 66, thereby eliminating the heat dissipating shortage and improving the cooling capacity. Can be maintained.

  The contents described above are only described for one mode for carrying out the invention, and the present invention is not limited to the above embodiment.

  For example, in the above embodiment, the indoor space 1 for supplying and air-conditioning is the living room 2 and the sanitary space 6 having the exhaust port opened is the bathroom 3, but the space for supplying and air-conditioning and the space for opening the exhaust port are Any space that is partitioned in the indoor space 1 may be used, and is not limited to the above. That is, the space for supplying and air-conditioning may be a corridor, and the space for opening the exhaust port may be set in the washroom 4.

  Moreover, in the said embodiment, although the structure which opens the blower outlet 12 and the suction inlet 16 in each one place of the living room 2 and the bathroom 3 was shown, respectively, the number of a blower outlet and a suction inlet is not limited to this. Absent. For example, it is good also as a structure which opens the blower outlet 12 in two places, the living room 2 and a corridor.

  Moreover, in the said embodiment, although it has set as the cassette type which provided the suction inlet 16 for exhaust in the grill 15 of the main body 7, the space which wants to exhaust to the tip of the duct by connecting a duct to the suction inlet 16 of the main body 7 The main body 7 may be a concealment type that is concealed and installed behind the ceiling.

  Moreover, in the said embodiment, although the structure which provided the bypass circuit 43 of the bypass circuit 43 and the bypass circuit 44 in the refrigerant circuit 39 was shown, a bypass circuit is good also as only one system.

  Moreover, in the said embodiment, although the structure which provides the refrigerant | coolant heating means 47 in parallel with the 2nd heat exchanger 29 was shown, as a structure which interposes in the refrigerant | coolant circuit 39 in series with the 2nd heat exchanger 29, it is also possible. good.

  In the above embodiment, the on / off valve 45 and the on / off valve 46 are switched in two stages of opening and closing. However, the opening / closing valve may be an electronic expansion valve or the like as long as it can open and close the bypass circuit. May be used.

  In the above embodiment, the second opening / closing valve 48 and the capillary tube 49 are provided in parallel as the pressure reducing means. However, the pressure reducing means may be any one that can switch the pressure reducing action, and the electronic expansion It is good also as a structure by which a valve is interposed.

  In the above-described embodiment, two types of configurations of the refrigerant heater 59 and the refrigerant-water heat exchanger 66 are shown as specific configurations of the refrigerant heater 47. However, the refrigerant heater 47 can heat the refrigerant. However, the present invention is not limited to the above two types.

  Moreover, in the said embodiment, although the structure which supplies the hot water from a combustion type water heater or a heat pump water heater to the water side piping of the refrigerant | coolant-water heat exchanger 66 was shown, What is necessary is just to supply hot water (for example, 40 degreeC-90 degreeC) or normal temperature water supply (for example, 1 degreeC-40 degreeC) to a water side piping, Hot water supply of a combustion type water heater or a heat pump water heater It is not limited to water. For example, a configuration for supplying circulating water for heating or room temperature city water used in gas water heaters, electric water heaters, hot water supplies for oil water heaters, water supply and floor heating, etc. Also good.

  In the above-described embodiment, AC / DC and the like are not particularly mentioned with respect to the motors of the supply fan 17, the exhaust fan 14, and the compressor 40, but it goes without saying that the energy saving performance is particularly improved by using a DC motor. Yes.

  Moreover, in the said embodiment, although the compressor 40 was set as the 2-rotor horizontal installation specification, if it is a low vibration, a scroll etc. may be sufficient, and if it is low-profile, it may be installed vertically.

  Moreover, in the said embodiment, although the structure which suspended the main body 7 on the ceiling back of the bathroom 3 was shown, the installation place and method have the space which can install a main body, maintainability, sound insulation, and vibration insulation. For example, the floor-mounted main body 7 may be installed in an indoor or outdoor machine room, or may be embedded in a wall surface.

  As described above, the ventilation air-conditioning apparatus according to the present invention can save space and improve workability. In addition, while exhausting moisture and odor generated from the sanitary space rapidly with a large air volume, By collecting the heat of the air and air-conditioning the indoor space while supplying fresh outdoor air, the air quality can be improved while improving the air quality. Ventilation / air supply not only for air supply / air conditioning but also for living spaces in living rooms, bedrooms, kitchens or washrooms, non-residential spaces such as storage rooms, under floors, warehouses, non-residential offices, conference rooms, warehouses, etc.・ It can also be applied to air conditioners.

The sketch of the living space where the ventilation air-conditioning apparatus concerning Embodiment 1 of this invention is installed Airway configuration diagram of the ventilation air conditioner Refrigerant circuit diagram of the ventilation air conditioner Perspective view of the ceiling where the ventilation air conditioner is installed Schematic configuration diagram of refrigerant heater that can be used as refrigerant heating means of the ventilation air conditioner Schematic sectional view of a refrigerant-water heat exchanger that can be used as a refrigerant heating means of the ventilation air conditioner Operation state diagram in each operation pattern of the ventilation air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor space 3 Bathroom 4 Washroom 5 Toilet 6 Sanitary space 7 Main body 8 Exhaust port 10 Air supply port 12 Air outlet 14 Exhaust fan 16 Suction port 17 Air supply fan 18 Air conditioner 20 Exhaust air channel 23 Supply air channel 26 First heat Exchanger 27 Auxiliary heater 28 Preheating heater 29 Second heat exchanger 31 Air path switching adjustment means 32 Supply air bypass means 33 Exhaust bypass means 34 Dehumidification switching means 35 Large drain device 36 Drain pump 38 Heat insulating material 39 Refrigerant circuit 40 Compressor 41 Expansion mechanism 42 Flow path switching valve 43 Bypass circuit 44 Bypass circuit 45 On-off valve 46 On-off valve 47 Refrigerant heating means 48 Second on-off valve 49 Capillary tube 51 Coil temperature sensor 52 Coil temperature sensor 59 Refrigerant heating heater 66 Refrigerant-water heat exchange Unit 67 Water heater

Claims (12)

An air intake fan that sucks outdoor air from an air supply opening that opens to the outside and blows air from an air discharge opening that opens to the indoor space, and an exhaust that opens to the outside by sucking air from the air intake opening that opens to the indoor sanitary space An exhaust fan that blows air from the mouth, a compressor that compresses the refrigerant, a first heat exchanger that exchanges heat between the air blown by the air supply fan and the refrigerant, an expansion mechanism that expands the refrigerant, and the exhaust A second heat exchanger for exchanging heat between the air blown by the fan and the refrigerant; and the compressor, the first heat exchanger, the expansion mechanism, the second heat exchanger, or the compressor, the first A refrigerant circuit in which the refrigerant circulates in the order of the two heat exchangers, the expansion mechanism, and the first heat exchanger, and heat is generated by the refrigerant between the first heat exchanger and the second heat exchanger. By moving The indoor space is heated or cooled while ventilating the sanitary space, and the air sucked into the suction port opened in the sanitary space is blown air that is air-conditioned by an air conditioner installed outside the sanitary space, The heat of the blown air is used, and the bottom of the supply air passage and the exhaust air passage including the first heat exchanger and the second heat exchanger is drained or evaporated at the bottom. deepest portion includes a drain pump, ventilation air conditioning system you characterized thereby driving the drain pump when draining at higher than the drain device drains apparatus provided with a gradient. Sucks outdoor air supply air passage and the periphery of the exhaust air passage for discharging the outdoor suck the sanitary air, characterized in that the heat insulation according to claim 1 Symbol mounting ventilation air-conditioning system that blows the indoor space. The ventilation air conditioner according to claim 1 or 2 , wherein at least a compressor, a first heat exchanger, a second heat exchanger, and an expansion mechanism are built in the main body. The ventilation air conditioner according to any one of claims 1 to 3 , further comprising an auxiliary heater for heating at least a part of the air blown by the air supply fan. The ventilation air conditioner according to any one of claims 1 to 4 , further comprising a preheating heater for preheating the air before being supplied to the second heat exchanger by the exhaust fan. The first heat exchanger or the second heat exchanger is provided with a coil temperature sensor for detecting the temperature of the refrigerant, and the flow path switching valve is switched based on the refrigerant temperature of the first heat exchanger or the second heat exchanger. The ventilation air conditioner according to any one of claims 1 to 5 , wherein A bypass circuit that branches from a refrigerant circuit that extends from the discharge side of the compressor to the expansion mechanism and merges with a refrigerant circuit that extends from the expansion mechanism to the suction side of the compressor, and an on-off valve that opens and closes the bypass circuit. The ventilation air conditioner according to any one of claims 1 to 6 . The ventilation air conditioner according to any one of claims 1 to 7 , wherein refrigerant heating means for heating the refrigerant is interposed in the refrigerant circuit so as to be in series or in parallel with the second heat exchanger. 9. The ventilation air conditioner according to claim 8, wherein the refrigerant heating means is a refrigerant heater that heats the refrigerant by electric heating. The ventilation air conditioner according to claim 8, wherein the refrigerant heating means is a refrigerant-water heat exchanger that heats the refrigerant by exchanging heat with hot water. The ventilation air conditioner according to claim 10 , wherein hot water boiled by a heat pump type hot water heater is used as hot water supplied to the refrigerant-water heat exchanger. The ventilation air conditioner according to claim 10 or 11 , wherein normal temperature water is supplied to the refrigerant-water heat exchanger so that the refrigerant radiates heat in the refrigerant-water heat exchanger.

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