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1. (WO2017037891) REFRIGERATION CYCLE DEVICE

Pub. No.:    WO/2017/037891    International Application No.:    PCT/JP2015/074949
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 03 01:59:59 CEST 2015
IPC: F25B 47/02
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: HATANAKA, Kensaku
畑中 謙作
TANAKA, Kosuke
田中 航祐
Title: REFRIGERATION CYCLE DEVICE
Abstract:
A refrigeration cycle device provided with a compressor, a flow path switching valve, a usage-side heat exchanger, a first expansion valve, a second expansion valve, and a heat-source-side heat exchanger, wherein: the refrigeration cycle device has a control device for performing control by switching the flow path switching valve between at least a heating operation and a defrosting operation; during the air-warming operation, the control device forms an air-warming pathway for circulating coolant through the compressor, the usage-side heat exchanger, the first expansion valve, the second expansion valve, the heat-source-side heat exchanger, and the compressor, in the stated order; and, during the defrosting operation, in the air-warming pathway, the control device forms a defrosting start circuit for circulating coolant by increasing the opening degree of the first expansion valve and the second expansion valve beyond the setting in the air-warming operation, and forms a defrosting circuit for circulating coolant through the compressor, the heat-source-side heat exchanger, the second expansion valve, the first expansion valve, the usage-side heat exchanger, and the compressor, in the stated order.