变频冷水机组部分负荷下冷却水定变流量性能研究

冷水机组大部分时间是在部分负荷下运行,而变频技术的发展使得变频压缩机和变频水泵越来越多地应用到制冷空调当中。本文针对制冷循环各部件建立了稳态模型,并在模型中引入RKS方程精确计算制冷剂的热物性。模拟结果表明:变频冷水机组在部分负荷下运行,定、变冷却水流量对机组蒸发温度影响不大,但冷凝温度有不同程度的降低。同时,考察定、变冷却水流量是否节能应着重考虑冷却水系统能耗在机组总能耗中所占的比例,冷却水系统能耗比例越大,变流量节能效果越明显。

Study on the Performance of Constant and Variable Water Flow under Part Load Conditions for Variable-frequency Chiller

The chillers are usually operated under part load conditions,and according to the development of variable-frequency,more and more variable speed compressors and pumps were used in refrigeration and air-conditioning systems.In this paper,the steady-state model of the refrigeration cycle was established and the RKS equation was introduced to calculate the thermophysical parameters accurately.The results indicated that the influences of constant and variable water flows on evaporating temperature were small when the chiller was operated under part load conditions,while the condensing temperature would decreased in varying degrees.At the same time,the energy-consumption proportion of cooling water system in the chiller should be carefully considered with respect to the energy-saving effect of variable water flow,the proportion was bigger,the effect of variable water flow was better.