Design and analysis of multistage spray heat exchangers in sewagesource heat pump systems

According to the status of sewage in a pharmaceutical factory in Harbin, uses the multistage spray heat exchanger in the sewagesource heat pump system. Based on the refrigerant state, divides a heat exchanger into three zones with zoned lump method, i.e. superheat, twophase and subcooling zones, works out the temperature difference and heat transfer coefficients of the three zones. Discusses the influence of structural parameters on the heat exchanger performance in order to get more rational setting of the number of columns, diameter and length of tubes, and designs the three stage spray heat exchanger in detail.