增压双效氨水吸收制冷循环性能分析

在双效氨水吸收制冷循环的基础上,提出了一种增压双效氨水吸收制冷循环。结合Schulz氨水状态方程式,通过数学建模对该循环过程进行模拟计算。分析了增压比、制冷温度、热源温度、冷却水温度对循环性能的影响,并和双效氨水吸收制冷循环进行比较。结果表明,增压双效氨水吸收制冷循环中,增压比是非常重要的影响因素,它直接影响循环的性能系数;在其他工况参数不变的条件下,增压双效氨水吸收制冷循环有其最佳的增压比;在适当的增压比下,扩大了双效循环的应用范围,在制冷温度较低时,也可以具有较高的性能系数,而且在相同制冷温度下,降低驱动热源温度也能达到理想的循环效果,从而使本循环可利用的热源范围得以扩展。

Performance analysis of boosting double-effect ammonia-water absorption refrigeration cycle

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.