期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：186
期号：5
页码：012039
DOI：10.1088/1755-1315/186/5/012039
语种：English
出版社：IOP Publishing
摘要：The Electronic expansion valve (EEV) has been used as a component responsible for controlling the superheat within the desired limits. In some of these controllers, the control parameters are set at a certain operating point and remain unaltered, even when the operating conditions change. This will lead to a reduction in system performance. In this paper, experiments were carried out to study the effect of EEV opening on the performance of the heat pump unit, and the result revealed that at different inlet water temperatures (13~23°C) the EEV opening had an optimal value: when the inlet water temperature of the source water was lower than 17°C, the COP value of the heat pump unit was the highest with the opening degree of the EEV at 60%, while the COP reached the highest value with EEV opening at 70% when the source water was above 17 °C. This study provided a reference for energy-saving operation of water source heat pump units.
Loading...
