A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental study on dynamic characteristics of an R290 heat pump during defrost
Abstract As a viable alternative for HCFCs and HFCs in the refrigeration and air conditioning industry, R290 has obvious advantages in aspects of environmental protection and thermal properties. At present, the application of R290 in air source heat pumps (ASHPs) is still in the stage of exploration and promotion. In this paper, the dynamic behaviors of an R290 ASHP were experimentally investigated during defrosting process, and an experimental platform of an R290 ASHP system was built to conduct defrosting experiments in a multifunctional enthalpy-difference laboratory. The variation of pressure and temperature of main components and the refrigerant status in the accumulator during defrosting process are shown in this paper. Experimental data was analyzed by combining the physical characteristics of R290, and the dynamic characteristics under three different working conditions were compared. The defrosting time of the three working conditions was 420 s, 435 s and 865 s respectively. In addition, there was a point M that the temperature difference between the inlet and outlet of outdoor heat exchanger (ODHE) approached zero at 370 s of condition II. The results and analysis of this research can provide effective guidance for improving the reliability of R290 ASHPs.
Experimental study on dynamic characteristics of an R290 heat pump during defrost
Abstract As a viable alternative for HCFCs and HFCs in the refrigeration and air conditioning industry, R290 has obvious advantages in aspects of environmental protection and thermal properties. At present, the application of R290 in air source heat pumps (ASHPs) is still in the stage of exploration and promotion. In this paper, the dynamic behaviors of an R290 ASHP were experimentally investigated during defrosting process, and an experimental platform of an R290 ASHP system was built to conduct defrosting experiments in a multifunctional enthalpy-difference laboratory. The variation of pressure and temperature of main components and the refrigerant status in the accumulator during defrosting process are shown in this paper. Experimental data was analyzed by combining the physical characteristics of R290, and the dynamic characteristics under three different working conditions were compared. The defrosting time of the three working conditions was 420 s, 435 s and 865 s respectively. In addition, there was a point M that the temperature difference between the inlet and outlet of outdoor heat exchanger (ODHE) approached zero at 370 s of condition II. The results and analysis of this research can provide effective guidance for improving the reliability of R290 ASHPs.
Experimental study on dynamic characteristics of an R290 heat pump during defrost
Du, Yanjun (author) / Wu, Jianhua (author) / Wang, Che (author)
Energy and Buildings ; 223
2020-05-21
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2012