| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a negative capacity in a defrosting operation and to improve control of refrigerant circulation, and reliability of a compressor by controlling a suction state of the compressor. <P>SOLUTION: This hot water system including a compressor 1, a four-way valve 2 for switching the direction of the refrigerating cycle during the defrosting operation, a water heat exchanger 3 for transferring heat between water and the refrigerant, an electronic expansion valve 4 for controlling a flow rate of the refrigerant to reduce a pressure, and an air heat exchanger 5 for transferring heat between air and the refrigerant, which are connected in that order by a pipeline 7 to form a refrigerating cycle to heat the water, further includes a bypath 8 for bypassing the refrigerant from the pipeline in upstream of the electronic expansion valve to a suction side of the compressor during the defrosting operation, a solenoid valve 9 for switching is installed in the bypath, and the bypass amount of the refrigerant in the bypath is adjusted by changing an opening of the electronic solenoid valve, when the solenoid valve is opened, and a part of the refrigerant passing through the water heat exchanger is bypassed in the bypath during the defrosting operation. <P>COPYRIGHT: (C)2008,JPO&INPIT |
