Double temperature chilled water unit based on large temperature glide zeotropic mixture

doi:10.11949/j.issn.0438-1157.20150285

Abstract

Abstract:

Accordingly to the properties of zeotropic mixture R32/R236fa, a novel double-temperature chilling unit is proposed which can be used in the temperature and humidity independent control air conditioning system (THICS), the unit can produce two different temperature of chilled water (such as low temperature is 7℃ and high temperature is 16℃). An experimental system is established to test the performance of the unit. The results show that at inlet water temperature of the condenser of 32℃ and inlet water temperature of the evaporator of 7℃ and 16℃, the coefficient of performance (COP) of the system can reach 3.92 when the mass component ratio of R32 is 60%. But under mass fractions of R32 of 50%, the combination properties of the system is the best and COP is higher than 3.55 in different operation condition. The results of this study provides the experimental foundation for the application of large temperature glide zeotropic mixture used in the double-temperature chilling water unit.

Key words: large temperature glide, zeotropic mixture, double temperature, chilling water unit, COP

摘要：

基于大滑移温度非共沸工质(R32/R236fa)的特性,搭建了可应用于温湿度独立控制系统的新型双温冷水机组及其实验系统,该机组可获得两种不同温度的冷冻水(例如低温7℃,高温16℃)。以机组的COP、制冷量等参数为评价指标,实验研究非共沸工质中R32的质量组分比例分别为30%、40%、50%、60%时机组在不同运行工况下的性能。结果表明:当冷却水进水温度为32℃,高、低温冷冻水的出水温度分别为16和7℃时,机组COP在R32质量组分比例为60%时达到3.92;而当R32的质量组分比例为50%时,机组具有最佳的综合性能,此时机组在不同运行工况下的COP均大于3.55。通过本研究可为非共沸工质在双温冷水机组中的应用以及优化提供数据基础。

关键词: 大滑移温度, 非共沸工质, 双温, 冷水机组, 制冷系数

CLC Number:

TK123

LIU Jian, ZHANG Xiaosong. Double temperature chilled water unit based on large temperature glide zeotropic mixture[J]. CIESC Journal, 2016, 67(4): 1186-1192.

刘剑, 张小松. 基于大滑移温度非共沸工质的双温冷水机组[J]. 化工学报, 2016, 67(4): 1186-1192.

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