TY - JOUR
T1 - Operating performance of a solar/air-dual source heat pump system under various refrigerant flow rates and distributions
AU - Liu, Zhijian
AU - Wang, Qiaomei
AU - Wu, Di
AU - Zhang, Yulong
AU - Yin, Hang
AU - Yu, Hancheng
AU - Jin, Guangya
AU - Zhao, Xudong
PY - 2020
Y1 - 2020
N2 - Rational utilization of renewable energy is widely used to reduce building energy consumption and save energy. To promote the utilization efficiency of renewable energy in cold climate regions especially plateau area, a novel solar/air-dual source heat pump system used for space heating was proposed and investigated in this paper. Based on a demonstration building in Qinghai-Tibetan Plateau, a dynamic simulation model was initially established by TRNSYS and validated by the experimental data. An idea of controlling refrigerant flow distribution was adopted in the coupling heat pump. Subsequently, the performance of the dual-source heat pump under various refrigerant flow rates and various ratios of refrigerant flowing into solar collector and evaporator was investigated and optimized. Results show that the optimal indoor temperature and coefficient of performance could be achieved when the refrigerant flow is 16 g/s. And when the ratio of the refrigerant entering into solar collector ranges 0.6–0.7, the result is the best. Simultaneously, the monthly average coefficient of performance of the dual-source heat pump could reach 3.6 generally, and the annual average indoor temperature of the building would be over 20 °C. The research suggests that the refrigerant flow rate has a significant effect on the performance of the dual-source heat pump, and appropriate ratio of refrigerant flowing into solar collector and evaporator can improve the performance. This paper could be as a reliable reference for an application of the solar/air-dual source heat pump system in severe cold region.
AB - Rational utilization of renewable energy is widely used to reduce building energy consumption and save energy. To promote the utilization efficiency of renewable energy in cold climate regions especially plateau area, a novel solar/air-dual source heat pump system used for space heating was proposed and investigated in this paper. Based on a demonstration building in Qinghai-Tibetan Plateau, a dynamic simulation model was initially established by TRNSYS and validated by the experimental data. An idea of controlling refrigerant flow distribution was adopted in the coupling heat pump. Subsequently, the performance of the dual-source heat pump under various refrigerant flow rates and various ratios of refrigerant flowing into solar collector and evaporator was investigated and optimized. Results show that the optimal indoor temperature and coefficient of performance could be achieved when the refrigerant flow is 16 g/s. And when the ratio of the refrigerant entering into solar collector ranges 0.6–0.7, the result is the best. Simultaneously, the monthly average coefficient of performance of the dual-source heat pump could reach 3.6 generally, and the annual average indoor temperature of the building would be over 20 °C. The research suggests that the refrigerant flow rate has a significant effect on the performance of the dual-source heat pump, and appropriate ratio of refrigerant flowing into solar collector and evaporator can improve the performance. This paper could be as a reliable reference for an application of the solar/air-dual source heat pump system in severe cold region.
KW - Qinghai-Tibetan Plateau
KW - Solar/air-dual source heat pump
KW - Dynamic simulation
KW - Refrigerant flow rate
KW - Optimization performance
U2 - 10.1016/j.applthermaleng.2020.115631
DO - 10.1016/j.applthermaleng.2020.115631
M3 - Journal article
SN - 1359-4311
VL - 178
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
M1 - 115631
ER -
