| Title |
Optimization Study of the Compression/Absorption Hybrid Heat Pump Cycle |
| Keywords |
Compression ; absorption cycle ; 증기압축식 ; 흡수식 ; Vapor compression ; solution circuit ; 용액순환부 ; 증기압축식 사이클 ; NH3 ; H2O ; 암모니아 ; 물 ; Temperature gradient ; 온도구배 |
| Abstract |
For the past few decades the vapor compression cycle with a solution circuit (VCCSC) has been known to provide high efficiency and variable capacity. In this study the performance of a VCCSC cycle is examined through computer simulation. In the simulation heat exchangers were modelled by specifying UA or effectiveness values while the compressor performance was specified by an isentropic efficiency. Aqua/ammonia solution was chosen as the working fluid which can be used in the high temperature range. The results show that there exists an optimum operation condition which is dependent upon the temperatures of the external heat transfer fluids (HTFs). Besides the HTFs' temperatures, the maximum system pressure and the size of the solution heat exchanger are shown to have an influence on the optimum operation condition. Finally, as compared to a simple vapor compression heat pump with HFC134a, the COP of the VCCSC is shown to be 2∼22% higher. |