Study on Compression/Absorption Hybrid Heat Pump System with Ammonia/Water Mixture

The objective of this paper is to analyze a single-stage vapor compression and absorption hybrid heat pump system using ammonia-water as a working fluid. The hybrid heat pump system is a combination of the vapor compression cycle and the absorption cycle to improve the performance of the heat pump system. The hybrid heat pump system uses the industrial waste heat source with a low temperature of 50 ℃. The system consists of an absorber, desorber, solution heat exchanger, rectifier, expansion valve, compressor and a solution pump. The absorber is an important component in the hybrid heat pump systems, and its performance affects the system performance significantly. Parametric analysis is carried out experimentally in the absorption process of the bubble type absorber. This study investigates the effects of the absorber internal pressure change and the plate absorber geometric conditions on the absorber capacity and COP. From the present experimental study, it is found that the maximum hot water temperature can be made as high as 80 ℃.