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热源塔热泵是一种新型的建筑冷热源系统,主要应用于我国夏热冬冷地区。针对热源塔冬季运行存在的溶液再生需求,本文提出了一种基于低压条件溶液沸腾再生的方法。本文结合乙二醇水溶液汽液平衡图,分析了乙二醇水溶液的再生机理。本文还建立了低压沸腾溶液再生实验平台和数学模型,分析了不同运行工况对溶液再生装置性能的影响规律。实验结果表明:该数学模型精度较高,溶液沸腾温度、装置换热量、凝结水量等参数模拟值与实验值偏差在5%以内。溶液再生装置中热水流量从0.4 kg/s增大至0.6 kg/s时,装置换热量增大7.7%,凝结水质量增加10.3%;冷却水流量从0.25 kg/s增大至0.45 kg/s时,装置换热量增大13.8%,凝结水质量增加15.9%。
Heat source tower heat pump is a new type of building cold heat source system, mainly used in China’s hot summer and cold winter area. In order to solve the need of solution regeneration in winter operation of heat source tower, a new method based on low pressure boiling solution regeneration was proposed. In this paper, ethylene glycol aqueous vapor-liquid equilibrium diagram, analysis of ethylene glycol aqueous solution regeneration mechanism. In this paper, a low pressure boiling solution regeneration experimental platform and mathematical model were established, and the influence of different operating conditions on the performance of the solution regeneration device was analyzed. The experimental results show that the accuracy of the mathematical model is high, and the deviation between experimental and simulated values of parameters such as solution boiling temperature, device heat transfer and condensate water volume is within 5%. When the hot water flow rate increases from 0.4 kg / s to 0.6 kg / s in the solution regeneration unit, the heat transfer increases by 7.7% and the condensate quality increases by 10.3%. The cooling water flow increases from 0.25 kg / s to 0.45 kg / s, heat exchange capacity increased 13.8%, condensate quality increased by 15.9%.