Ezperimental Study of the Characteristics of an Air Source Heat Pump with Enhanced Vapor Injection
In low environmental temperature, problems such as attenuation of heating capacity, descent of COP and increase of discharge temperature appear in the running of air source heat pump. The method of adopting enhanced vapor injection to implement quasi-two stage compression cycle will improve working perfomance of air source heat pump running in low environmental temperature. To analyze in detail the characteristics of air source heat pump with enhanced vapor injection, air source beat pump water chiller-heater unit with enhanced vapor injection scroll compressor as its chief unit was designed and analyzed. Experimental research on characteristics of the unit has been carried out with the environmental temperature ranging from -12~C to 10~C, and the relationship of parameters of beat capacity, power input, COP and discharge temperature changing with injection pressure has been found. Under the experimental conditions the results are as the following: at low environmental temperature, heat capacity, COP and power input of the system with enhanced vapor injection are comparatively higher than those of non-quasi-two compression cycle. But as the foundation of the beat capacity and COP at low environmental temperature is very low, the absolute value of the effect of enhanced vapor injection to the improvement on the performance proves quite low. The most remarkable effect of adopting enhanced vapor injection is noticeable decrease of discharge temperature and thus improves the reliability of the air source heat pump working in low temperature. The research provides a valuable reference to the design and application of air source heat pump with enhanced vapor injection.
Enhanced vapor injection Air source heat pump Injection pressure
Hu Huang Zhongbin Zhang Jinzhu Gong Dongxue Yuan Qihe Li
School of Dynamic Engineering,Nanjing Normal University,Nanjing,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
595-601
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）