Air conditioning/ventilating system

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.

1 . A ventilating air-conditioning system comprising:
 an air supply fan drawing in outdoor air through an air inlet open to outdoors and blowing out the outdoor air through an air outlet open to an indoor space;   an exhaust fan drawing in air in a sanitary space through an air inlet open to the sanitary space and blowing out the air in the sanitary space through an air outlet open to the outdoors;   a compressor compressing a refrigerant;   a first heat exchanger heat-exchanging between the outdoor air sent by the air supply fan and the refrigerant;   an expansion mechanism expanding the refrigerant;   a second heat exchanger heat-exchanging between air in the sanitary space sent by the exhaust fan and the refrigerant; and   a refrigerant circuit piped so that the refrigerant circulates in order of the compressor, the first heat exchanger, the expansion mechanism, and the second heat exchanger, or in order of the compressor, the second heat exchanger, the expansion mechanism, and the first heat exchanger,   wherein the system heats or cools the indoor space while ventilating the sanitary space by transferring heat between the first heat exchanger and the second heat exchanger through the refrigerant.   
     
     
         2 . The ventilating air-conditioning system of  claim 1 , further comprising:
 a decompression unit decompressing the refrigerant at piping through which the refrigerant in the first heat exchanger flows.   
     
     
         3 . The ventilating air-conditioning system of  claim 1 , wherein a larger volume of air is sent from the supply fan or the exhaust fan when heating, cooling, or dehumidifying the indoor space than when ventilating the sanitary space. 
     
     
         4 . The ventilating air-conditioning system of  claim 1 , wherein the indoor space is provided therein with an air-conditioner for controlling temperature of the indoor space, and air in the sanitary space drawn into the air inlet is air conditioned by the air-conditioner. 
     
     
         5 . The ventilating air-conditioning system of  claim 1 , further comprising:
 an auxiliary heater heating at least part of the outdoor air sent by the air supply fan.   
     
     
         6 . The ventilating air-conditioning system of  claim 1 , further comprising:
 a preheater preheating air drawn in from the sanitary space.   
     
     
         7 . The ventilating air-conditioning system of  claim 1 , further comprising:
 a coil temperature sensor detecting temperature of the refrigerant in the first heat exchanger and the second heat exchanger at a side of the expansion mechanism.   
     
     
         8 . The ventilating air-conditioning system of  claim 1 , further comprising:
 a supply air path including an air supply connection unit connected to an air supply duct communicating with the air inlet, an air outlet connection unit connected to an exhaust duct communicating with the air outlet, and the first heat exchanger, and communicating between the air supply connection unit and the air outlet connection unit;   an exhaust air path including an exhaust connection unit connected to an exhaust duct communicating with the air outlet and the second heat exchanger, and communicating between the exhaust connection unit and the air inlet; and   an air path changing and adjusting unit communicating or blocking between an upstream side of the first heat exchanger and an upstream side of the second heat exchanger, or adjusting an amount of communication.   
     
     
         9 . The ventilating air-conditioning system of  claim 8 , further comprising:
 an air supply bypass blowing out part of the outdoor air into the indoor space, in the supply air path; and   an exhaust bypass discharging part of air in the sanitary space into the outdoors, in the exhaust air path.   
     
     
         10 . The ventilating air-conditioning system of  claim 8 , further comprising:
 a dehumidification changer communicating or blocking between a downstream side of the second heat exchanger and a downstream side of the first heat exchanger, or adjusting an amount of communication, in the exhaust air path.   
     
     
         11 . The ventilating air-conditioning system of  claim 8 , further comprising:
 a drain unit draining or vaporizing dew condensation water generated in the first heat exchanger and the second heat exchanger, at bottoms of the supply air path and the exhaust air path.   
     
     
         12 . The ventilating air-conditioning system of  claim 11 , further comprising:
 a drain pump draining water stored in the drain unit.   
     
     
         13 . The ventilating air-conditioning system of  claim 8 , wherein the supply air path and the exhaust air path including outer shells thereof are heat-insulated. 
     
     
         14 . The ventilating air-conditioning system of  claim 1 , further comprising:
 a flow path changing valve changing a flow direction of the refrigerant from order of the compressor, the first heat exchanger, the expansion mechanism, and the second heat exchanger, to order of the compressor, the second heat exchanger, the expansion mechanism, and the first heat exchanger.   
     
     
         15 . The ventilating air-conditioning system of  claim 14 ,
 wherein the refrigerant circuit includes:   a first bypass circuit splitting from piping connecting the flow path changing valve to the first heat exchanger, and joining piping connecting the expansion mechanism to the second heat exchanger; and   a second bypass circuit splitting from piping connecting the first heat exchanger to the expansion mechanism, and joining piping connecting the second heat exchanger to the flow path changing valve,   wherein the first bypass circuit includes a first open and close valve opening and closing the first bypass circuit, and the second bypass circuit includes a second open and close valve opening and closing the second bypass circuit.   
     
     
         16 . The ventilating air-conditioning system of  claim 15 , further comprising:
 a refrigerant heater unit heating a refrigerant in the second bypass circuit in series or parallel with the second heat exchanger.   
     
     
         17 . The ventilating air-conditioning system of  claim 16 , wherein the refrigerant heater unit is a refrigerant heater heating the refrigerant by making an electrothermal tube generate heat. 
     
     
         18 . The ventilating air-conditioning system of  claim 16 , wherein the refrigerant heater unit is a refrigerant-water heat exchanger with a refrigerant pipe line, through which the refrigerant flows, inside a hot-water pipe line through which hot water flows. 
     
     
         19 . The ventilating air-conditioning system of  claim 18 , wherein hot water used for the refrigerant-water heat exchanger is heated by a heat pump water heater. 
     
     
         20 . The ventilating air-conditioning system of  claim 18 , wherein the hot water is drained through the drain unit. 
     
     
         21 . The ventilating air-conditioning system of  claim 18 , wherein the refrigerant-water heat exchanger is supplied with normal-temperature water. 
     
     
         22 . The ventilating air-conditioning system of  claim 19 , wherein the hot water is drained through the drain unit.