Heat pump system

Abstract

A heat pump system includes a first air-conditioning apparatus, a ventilator, and a refrigerant circuit. The first air-conditioning apparatus includes a compressor, an outdoor-side heat exchanger, an expansion device, and an indoor-side heat exchanger, and air-conditions a first space. The ventilator includes a first auxiliary heat exchanger, and ventilates and air-conditions a second space different from the first space. In the refrigerant circuit, the compressor, the outdoor-side heat exchanger, the first auxiliary heat exchanger, the expansion device, and the indoor-side heat exchanger are sequentially connected by a refrigerant pipe to allow refrigerant to circulate. The first auxiliary heat exchanger is provided in a supply air passage in the ventilator.

1 . A heat pump system comprising:
 a first air-conditioning apparatus including a compressor, an outdoor-side heat exchanger, an expansion device, and an indoor-side heat exchanger, and configured to air-condition a first space;   a ventilator including a first auxiliary heat exchanger, and configured to ventilate and air-condition a second space different from the first space; and   a refrigerant circuit in which the compressor, the outdoor-side heat exchanger, the first auxiliary heat exchanger, the expansion device, and the indoor-side heat exchanger are sequentially connected by a refrigerant pipe to allow refrigerant to circulate,   wherein the first auxiliary heat exchanger is provided in a supply air passage in the ventilator   the ventilator includes a total heat exchanger, and   the first auxiliary heat exchanger is provided in part of the supply air passage that is located leeward of the total heat exchanger.   
     
     
         2 . (canceled) 
     
     
         3 . The heat pump system of  claim 1 , wherein the refrigerant circuit includes
 a bypass provided to bypass the first auxiliary heat exchanger, and   a flow switching device provided between the outdoor-side heat exchanger and the first auxiliary heat exchanger, and configured to switch a flow passage for the refrigerant to one of a flow passage in which the refrigerant flows into the first auxiliary heat exchanger and a flow passage in which the refrigerant flows into the bypass.   
     
     
         4 . The heat pump system of  claim 1 , wherein
 the ventilator includes a second auxiliary heat exchanger in an exhaust air passage,   the second auxiliary heat exchanger is connected in parallel with the first auxiliary heat exchanger in the refrigerant circuit, and   the refrigerant circuit includes a flow switching device that is provided between the outdoor-side heat exchanger and the first auxiliary heat exchanger, and that is configured to switch a flow passage for the refrigerant to one of a flow passage in which the refrigerant flows into the first auxiliary heat exchanger and a flow passage in which the refrigerant flows into the second auxiliary heat exchanger.   
     
     
         5 . The heat pump system of  claim 1 , wherein
 the ventilator includes a second auxiliary heat exchanger in an exhaust air passage,   the second auxiliary heat exchanger is connected in parallel with the first auxiliary heat exchanger in the refrigerant circuit, and   the refrigerant circuit includes
 a bypass provided to bypass the first auxiliary heat exchanger and the second auxiliary heat exchanger, and 
 a flow switching device provided between the outdoor-side heat exchanger and the first auxiliary heat exchanger, and configured to switch a flow passage for the refrigerant to one of a flow passage in which the refrigerant flows into the first auxiliary heat exchanger, a flow passage in which the refrigerant flows into the second auxiliary heat exchanger, and a flow passage in which the refrigerant flows into the bypass. 
   
     
     
         6 . The heat pump system of  claim 4 , wherein
 the ventilator includes a total heat exchanger, and   the second auxiliary heat exchanger is provided in part of the exhaust air passage that is located leeward of the total heat exchanger.   
     
     
         7 . The heat pump system of  claim 3 , further comprising a controller configured to cause the flow switching device to switch the flow passage for the refrigerant in such a manner as to reduce an internal air-conditioning load in the second space. 
     
     
         8 . The heat pump system of  claim 7 , wherein the controller causes the flow switching device to switch the flow passage for the refrigerant to the flow passage in which the refrigerant flows into the first auxiliary heat exchanger, when a first condition is satisfied, in which an operation mode of the first air-conditioning apparatus is different from an operation mode of a second air-conditioning apparatus configured to air-condition the second space, the compressor of the first air-conditioning apparatus and a compressor of the second air-conditioning apparatus are both in operation, and the ventilator is in operation. 
     
     
         9 . The heat pump system of  claim 8 , further comprising an outside-air temperature sensor configured to detect an outside air temperature,
 wherein when the first condition is satisfied, if the outside air temperature is lower than or equal to a first temperature set in advance or higher than or equal to a second temperature set in advance and higher than the first temperature, the controller causes the flow switching device to switch the flow passage for the refrigerant to the flow passage in which the refrigerant flows into the bypass.   
     
     
         10 . The heat pump system of  claim 4 , further comprising:
 a controller configured to cause the flow switching device to switch the flow passage for the refrigerant in such a manner as to reduce an internal air-conditioning load in the second space; and   an outside-air temperature sensor configured to detect an outside air temperature,   wherein the controller causes the flow switching device to switch the flow passage for the refrigerant to the flow passage in which the refrigerant flows into the first auxiliary heat exchanger, when a first condition is satisfied, in which an operation mode of the first air-conditioning apparatus is different from an operation mode of a second air-conditioning apparatus configured to air-condition the second space, the compressor of the first air-conditioning apparatus and a compressor of the second air-conditioning apparatus are both in operation, and the ventilator is in operation, and   wherein the controller causes the flow switching device to switch the flow passage for the refrigerant to the flow passage in which the refrigerant flows into the second auxiliary heat exchanger, when the first condition is satisfied and the outside air temperature is lower than or equal to a first temperature set in advance or higher than or equal to a second temperature set in advance and higher than the first temperature.