Air-conditioner

Abstract

An air-conditioner is provided with a refrigerant circuit and an indoor fan. The refrigerant circuit has a compressor, a first four-way valve, an outdoor heat exchanger, a first expansion valve, a second four-way valve, a third four-way valve, an indoor heat exchanger, and a second expansion valve. The indoor heat exchanger has a first heat exchange portion and a second heat exchange portion. During a cooling operation, in the first heat exchange portion and the second heat exchange portion, a flow of refrigerant with respect to a flow of air sent by the indoor fan is a parallel flow. In a reheating dehumidification operation, in the first heat exchange portion, the flow of refrigerant with respect to the flow of air is the parallel flow, and in the second heat exchange portion, the flow of refrigerant with respect to the flow of air is a counterflow.

1 . An air-conditioner comprising:
 a refrigerant circuit having a compressor, a first four-way valve, an outdoor heat exchanger, a first expansion valve, a second four-way valve, a third four-way valve, an indoor heat exchanger, and a second expansion valve, the refrigerant circuit being configured to circulate refrigerant; and   an indoor fan configured to send air to the indoor heat exchanger, wherein   the indoor heat exchanger has a first heat exchange portion and a second heat exchange portion,   the first four-way valve, the second four-way valve, and the third four-way valve are switched to allow refrigerant to flow through the refrigerant circuit in an order of the compressor, the first four-way valve, the outdoor heat exchanger, the first expansion valve, the second four-way valve, the third four-way valve, the first heat exchange portion, the third four-way valve, the second expansion valve, the second heat exchange portion, the second four-way valve, and the first four-way valve during a cooling operation,   the first four-way valve, the second four-way valve, and the third four-way valve are switched to allow refrigerant to flow through the refrigerant circuit in an order of the compressor, the first four-way valve, the outdoor heat exchanger, the first expansion valve, the second four-way valve, the second heat exchange portion, the second expansion valve, the third four-way valve, the first heat exchange portion, the third four-way valve, the second four-way valve, and the first four-way valve during a reheating dehumidification operation,   during the cooling operation, in the first heat exchange portion and the second heat exchange portion, a flow of refrigerant with respect to a flow of air sent by the indoor fan is a parallel flow, and   during the reheating dehumidification operation, in the first heat exchange portion, the flow of refrigerant with respect to the flow of air is a parallel flow, and in the second heat exchange portion, the flow of refrigerant with respect to the flow of air is a counterflow.   
     
     
         2 . The air-conditioner according to  claim 1 , wherein
 the refrigerant circuit has a first extension pipe that connects the first expansion valve and the second four-way valve to each other and a second extension pipe that connects the first four-way valve and the second four-way valve to each other, and   the first extension pipe is smaller in inner diameter than the second extension pipe.