特征参数劣化对热泵机组能效的影响规律研究

Study on Influence Rule of Characteristic Parameters Degradation on Energy Efficiency for Heat Pump

热泵机组能效劣化特征参数是由其各主要组成部件有关能效性能劣化特征参数组成,本文使用压缩机综合效率和容积效率来表征压缩机的功效性能,使用传热系数来表征冷凝器和蒸发器的换热性能,根据能量方程、基本传热方程和计算传热系数的准则关联式建立理论循环热力计算的机理模型,通过对实际循环与理论循环的区别分析建立实际循环热力计算的黑箱模型,通过将模型应用到某一实际热泵机组中,分析了特征参数随负荷率的变化规律,重点分析了特征参数劣化在不同负荷率下对机组能效比和压缩机耗电量的影响规律。

The characteristic parameters of the degradation of energy efficiency for heat pump comprise these characteristic parameters representing the degradation of energy efficiency of the main components for heat pump.This paper uses combined efficiency and volume efficiency of compressor to represent the efficacy of compressor,and uses heat transfer coefficient to represent the heat transfer efficiency of condenser and evaporator. Based on the energy equation,basic heat transfer equation and the norm correlation formulas to calculate the heat transfer coefficient,the mechanism model of thermodynamic calculation of theoretical cycle was built. According to analysis on the difference between actual cycle and theoretical cycle,the black-box model of thermodynamic calculation of actual cycle was built. This paper analyzes the variation rule of characteristic parameters according to load rate,and mainly analyzes the effect rules of the characteristic parameters degradation on the energy efficiency of unit and power consumption of compressor during different load rates by applying the models to an actual heat pump unit.