- Sung IL Ro
- DOI: 10.5281/zenodo.17471667
- GAS Journal of Engineering and Technology (GASJET)
The COP of the air source
heat pump drops as the ambient temperature decreases, and then the exhaust gas
temperature of the compressor rises, making it impossible to use it.
In this paper, an automatic
cascaded air source heat pump system (ACASHPs) with flash tank and economizer
is presented to improve the performance of air source heat pump in cold regions
where the ambient temperature is below -10℃.
The refrigerant R600/R143a
(0.2/0.8) mixture was used and the characteristics of the ACASHPs with flash
tank and economizer were compared with typical heat pump systems when producing
hot water at 50 ℃ under ambient temperature of -25~5 ℃.
The analysis shows that the
COP can be 6.2~30.3% higher and the discharge temperature can be 48.7~10.5 ℃
lower than the conventional ACASHPs.
It was also shown that the high COP and stable operating conditions can be achieved compared with the single stage compression systems with the economizer.
