Refrigeration cycle apparatus

Abstract

A refrigeration cycle apparatus includes a refrigerant circuit in which a compressor, a refrigerant flow switching device, an air-side heat exchanger, an expansion valve, a water-side heat exchanger, and an accumulator are connected by refrigerant pipes and refrigerant is circulated. G/A is less than or equal to a predetermined threshold χ, where G [L] is a difference in volume between the air-side heat exchanger and the water-side heat exchanger, and A [L] is a volume of the refrigerant circuit.

1 . (canceled) 
     
     
         2 . A refrigeration cycle apparatus comprising a refrigerant circuit in which a compressor, a refrigerant flow switching device, an air-side heat exchanger, an expansion valve, a water-side heat exchanger, and an accumulator are connected by refrigerant pipes and refrigerant is circulated,
 wherein the refrigerant pipes include a high-pressure pipe that connects a discharge side of the compressor with the water-side heat exchanger in a heating operation and a low-pressure pipe that connects the air-side heat exchanger with a suction side of the compressor in the heating operation,   G/A is less than or equal to a predetermined threshold χ, where G [L] is a difference in volume between the air-side heat exchanger and the water-side heat exchanger, and A [L] is a volume of the refrigerant circuit, and   where an outer diameter of the high-pressure pipe is 25.4 mm, and an outer diameter of the low-pressure pipe is D mm, the threshold χ is expressed by the following equation:
     x= 0.0000001479 D   3 −0.0000245654 D   2 +0.0000786935 D+ 0.2018219300.
 
   
     
     
         3 . A refrigeration cycle apparatus comprising a refrigerant circuit in which a compressor, a refrigerant flow switching device, an air-side heat exchanger, an expansion valve, a water-side heat exchanger, and an accumulator are connected by refrigerant pipes and refrigerant is circulated,
 wherein the refrigerant pipes include a high-pressure pipe that connects a discharge side of the compressor with the water-side heat exchanger in a heating operation and a low-pressure pipe that connects the air-side heat exchanger with a suction side of the compressor in the heating operation,   G/A is less than or equal to a predetermined threshold χ, where G [L] is a difference in volume between the air-side heat exchanger and the water-side heat exchanger, and A [L] is a volume of the refrigerant circuit, and   where an outer diameter of the high-pressure pipe is 28.6 mm, and an outer diameter of the low-pressure pipe is D mm, the threshold χ is expressed by the following equation:
     x= 0.0000001432 D   3 −0.0000239347 D   2 +0.0000774572 D+ 0.1991706771.
 
   
     
     
         4 . A refrigeration cycle apparatus comprising a refrigerant circuit in which a compressor, a refrigerant flow switching device, an air-side heat exchanger, an expansion valve, a water-side heat exchanger, and an accumulator are connected by refrigerant pipes and refrigerant is circulated,
 wherein the refrigerant pipes include a high-pressure pipe that connects a discharge side of the compressor with the water-side heat exchanger in a heating operation and a low-pressure pipe that connects the air-side heat exchanger with a suction side of the compressor in the heating operation,   G/A is less than or equal to a predetermined threshold χy, where G [L] is a difference in volume between the air-side heat exchanger and the water-side heat exchanger, and A [L] is a volume of the refrigerant circuit, and   where an outer diameter of the high-pressure pipe is 31.75 mm, and an outer diameter of the low-pressure pipe is D mm, the threshold χ is expressed by the following equation:
     x= 0.0000001376 D   3 −0.0000231712 D   2 +0.0000758817 D+ 0.1959228337.