多联式空调冷凝水能量回收系统设计及CFD模拟研究

Design and CFD Simulation of Condensate Energy Recovery System for Multi-connected Air Conditioning

通过智能控制与能量回收提高暖通空调系统的使用效率,降低制冷、制热能源消耗,是实现建筑节能的有效方式。目前空调冷凝水的就近或集中排放,造成了水量和冷量的浪费。通过设计冷凝水导液仓连接器和套管式换热器,实现冷凝水冷量和冷凝器侧液态制冷剂热量的交换,起到回收冷凝水冷量,增加制冷剂过冷度,提高制冷循环效率的目的。使用CFD模拟软件,分析制冷剂入口温度、冷凝水入口温度、制冷剂入口质量流量和冷凝水入口质量流量对制冷剂出口平均温度、过冷度、壁面热流、性能系数和压缩机功耗的影响,提出能量回收装置的热量交换规律和最佳换热工况,对工程应用具有较强的理论指导意义。

Intelligent control and energy recovery are effective ways to improve the efficiency of HVAC systems and reduce the energy consumption of refrigeration and heating.At present,the nearby or centralized discharge of air-conditioning condensate causes waste of water and cooling capacity.The condensate guide bin connector and the double-pipe heat exchanger are designed to realize the exchange of the condensate cooling capacity and the heat of the liquid refrigerant at the condenser side,so as to recover the condensate cooling capacity,increase the refrigerant supercooling and improve the efficiency of the refrigeration cycle.In this paper,the effects of refrigerant inlet temperature,condensate inlet temperature,refrigerant inlet mass flow and condensate inlet mass flow on the average temperature of refrigerant outlet,subcooling,wall heat flow,coefficient of performance and compressor power consumption are analyzed through the CFD simulations.The heat exchange law and optimal heat exchange conditions of the energy recovery device are proposed,which has strong theoretical guiding significance for engineering application.