不完全湿压缩特性研究

Study on the Characteristics of Incomplete Wet Compression

本文提出了不完全湿压缩概念,并利用制冷剂在温熵图上气化饱和线的坡度系数预测工质的不完全湿压缩特性。分析在AHRI(Air-Conditioning,Heating,and Refrigeration Institute,空调供暖制冷协会)空调和低温制冷工况下,R22、R32和NH_3这三种湿工质的坡度较缓,其最大COP都在不完全湿压缩区间,COP的增加值(与吸气饱和时相比)分别为0.43%/0.32%,2.12%/2.44%和5.89%/9.95%;R134a的坡度系数绝对值过小,吸气带液压缩的理论COP反而下降。研究表明:坡度系数为负值的工质具有较好的不完全湿压缩性能,且坡度越缓,其湿压缩COP改善的几率越大;R32和氨的排气温度高,而且其吸气带液压缩COP改善的潜力也更大,不完全湿压缩对于排气温度高且坡度系数绝对值大的湿工质应用价值更大。

The thesis presents the concept of incomplete wet compression.And the vapor saturation line slope coefficient of the refrigerant on the T-S curve is used to predict the wet compression characteristic of the substance.The thesis also analyses that under AHRI AC and refrigeration applications,the slope of three substance R22,R32 and NH3 are moderate,the max COPs of which are within the range of incomplete wet compression,and the improvement of COPs（compared with when they are saturated）are respectively 0.43%/0.32%,2.12%/2.44% and 5.89%/ 9.95%.The absolute gradient coefficient of R134 a is too small,thus the theory COP of inspiratory liquid compression decreases.The experiment suggests：substances with negative value boast a better incomplete wet compression,and a more moderate slope guarantees more chance to change the wet compression COP.A higher temperature of R32 and ammonia guarantees a better potential in changing the inspiratory liquid compression COP,and a greater application value of incomplete wet compression on substance of higher temperature and larger absolute value of slope coefficient.