关键词: 氨水吸收, 制冷, 增压, 双效, 性能系数

Abstract: On the basis of double-effect NH₃-H₂O absorption refrigeration cycle,a boosting double-effect NH₃-H₂O absorption refrigeration cycle was proposed.Combined with Schulz’s ammonia-water state equation,mathematical model was established to simulate the process and analyze influencing factors of performance such as pressure ratio,refrigeration temperature,cooling water temperature and heat source temperature.A comparison with traditional double-effect ammonia-water absorption refrigeration cycle was also made.The result showed that pressure ratio was a very important factor,which directly affected performance coefficient of the cycle and without changing other factors,the cycle had the optimum pressure ratio.With the appropriate pressure ratio,the cycle could also have higher performance coefficient at lower refrigeration temperature and expanded the scope of refrigeration application of the double-effect cycle.Meanwhile,at the same refrigeration temperature,the cycle reduced the driven heat source temperature and expanded the scope of the available heat source.

Key words: ammonia-water absorption, refrigeration, compression, double-effect, performance coefficient