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提出了1种利用非共沸混合工质相变温差实现变蒸发温度的制冷系统,该制冷系统分别提供7℃/12℃和18℃/23℃冷水用于温湿度独立控制的空调系统。该系统基于劳伦兹循环,采用R236fa/R32(0.7/0.3)为工质,对循环系统做了热力计算,对设定4.66 k W负荷的空调系统与常规制冷剂的冷水机组进行分析,并对热湿负荷比对机组的性能影响进行了分析。研究结果表明:当湿负荷比0.2<α<0.5时,本系统相对逆卡诺循环具有节能效果,COP值最大可提高22%。COP值随α值的增大而减小。本系统不建议用于湿负荷比太大(α>0.5)和太小(α<0.2)的空调系统。
A refrigeration system is proposed to realize variable evaporating temperature by using the phase change temperature difference of non-azeotropic mixed working medium. The refrigeration system provides 7 ℃ / 12 ℃ and 18 ℃ / 23 ℃ cold water respectively for air conditioning system with independent control of temperature and humidity. Based on the Lorentz cycle, the system uses R236fa / R32 (0.7 / 0.3) as working fluid, calculates the heat of the circulating system, analyzes the air conditioning system with 4.66 kW load and the chiller unit with conventional refrigerant The effect of heat and moisture load ratio on the performance of the unit was analyzed. The results show that when the wet load ratio is 0.2 <α <0.5, the system has energy saving effect on the reverse Carnot cycle, and the maximum COP value can be increased by 22%. The COP value decreases as the alpha value increases. This system is not recommended for air conditioning systems with wet load ratios too large (α> 0.5) and too small (α <0.2).