Experimental study on influence of electronic expansion valve opening on performance of water source heat pump unit

2018 International Conference of Green Buildings and Environmental Management

土木建筑工程;生态环境科学

Zhao, Yuqing^1 ; Liu, Qingqing^1 ; Gao, Jianling^1

School of Civil Engineering, North China University of Technology, Beijing

100144, China^1

关键词: Control parameters;    Electronic expansion valves;    Energy-saving operation;    Inlet water temperatures;    Operating condition;    Operating points;    Optimal values;    Water source heat pump;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/186/5/012039/pdf
DOI  :  10.1088/1755-1315/186/5/012039

来源: IOP

【 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.