不同增压方式对空气源吸收式热泵性能影响的模拟分析

The energy consumption of heating and domestic hot water in China is very large. The heat supply system based on air source absorption heat pump (ASAHP) is a promising alternative solution in cold regions. However, the single-stage ASAHP cannot operate normally under very cold weathers. Compression-assisted absorption cycles, including high-pressure boosting and low-pressure boosting in terms of the position of the pressurizer in the cycle, are proposed to improve the performance of ASAHP under low ambient temperatures. Different kinds of compression-assisted ASAHP using NH₃-LiNO₃ as working fluid have been comparatively simulated and analyzed. The results indicate that both high-pressure and low-pressure boosting can effectively improve the performance of ASAHP in cold conditions. Energy saving rates as high as 20%-45% can be obtained with different outdoor temperatures, driving source temperatures and hot water temperatures. Besides, low-pressure boosting ASAHP can achieve a higher primary energy efficiency than high-pressure boosting cycle in the same condition. Taken energy efficiency as well as difficulty of realization together, it can be concluded that the low-pressure boosting is a better choice for the improvement of ASAHP in cold regions. © All Rights Reserved.