TY - JOUR
T1 - Dynamic character investigation and optimization of a novel air-source heat pump system
AU - Wang, Zhihua
AU - Wang, Fenghao
AU - Wang, Xinke
AU - Ma, Zhenjun
AU - Wu, Xiaozhou
AU - Song, Mengjie
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/1/25
Y1 - 2017/1/25
N2 - Heating capacity of an air-source heat pump (ASHP) system often decreases when it is operated in winter. This is because of frosting significantly affects the heat transfer efficiency of evaporator, and thus the airflow passage blocked. In order to solve this problem, a novel frost-free ASHP system, integrated with dehumidification and thermal energy storage, has been developed. In this paper, to further investigate the dynamic characteristics of the system working at low temperature, a mathematical model of the novel frost-free ASHP system was constructed. The mathematical model was verified by comparison with experimental data that showed that the measured results were in good accordance with the numerical ones. According to the mathematical model, the research results indicated that, at relatively humidity (RH) of 80%, the system average COP increased by 56.2% when ambient temperature increased from −10 °C to 0 °C. However, it decreased by 6.7% when RH increased from 75% to 85% at temperature of 0 °C. In addition, the system average COP at the air velocity of 3.0 m s−1 was higher 0.22 and 0.16 than that of 2.5 m s−1 and 3.5 m s−1. Finally, the correlations of the system frost-free working time and the system COP with ambient temperature and relative humidity were obtained, respectively, by multivariate linear regression. These results provided a basis in improving and optimizing the thermal system COP and other main performance parameters.
AB - Heating capacity of an air-source heat pump (ASHP) system often decreases when it is operated in winter. This is because of frosting significantly affects the heat transfer efficiency of evaporator, and thus the airflow passage blocked. In order to solve this problem, a novel frost-free ASHP system, integrated with dehumidification and thermal energy storage, has been developed. In this paper, to further investigate the dynamic characteristics of the system working at low temperature, a mathematical model of the novel frost-free ASHP system was constructed. The mathematical model was verified by comparison with experimental data that showed that the measured results were in good accordance with the numerical ones. According to the mathematical model, the research results indicated that, at relatively humidity (RH) of 80%, the system average COP increased by 56.2% when ambient temperature increased from −10 °C to 0 °C. However, it decreased by 6.7% when RH increased from 75% to 85% at temperature of 0 °C. In addition, the system average COP at the air velocity of 3.0 m s−1 was higher 0.22 and 0.16 than that of 2.5 m s−1 and 3.5 m s−1. Finally, the correlations of the system frost-free working time and the system COP with ambient temperature and relative humidity were obtained, respectively, by multivariate linear regression. These results provided a basis in improving and optimizing the thermal system COP and other main performance parameters.
KW - Air-source heat pump
KW - Frost
KW - Mathematical model
KW - Solid desiccant
KW - System optimization
KW - Thermal energy storage
UR - https://www.scopus.com/pages/publications/84988419148
U2 - 10.1016/j.applthermaleng.2016.09.076
DO - 10.1016/j.applthermaleng.2016.09.076
M3 - Article
AN - SCOPUS:84988419148
SN - 1359-4311
VL - 111
SP - 122
EP - 133
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -