高温空调系统性能仿真与分析

Simulation and Analysis of High-temperature Air Conditioning System Performance

为了指导高温空调系统的设计,本文针对高温制冷剂R236fa,开发了系统稳态仿真模型。建立了压缩机、换热器和膨胀阀等部件模型,开发了基于各部件耦合关系的质量引导的系统求解算法。验证表明,压缩机流量的计算误差在±5%以内,蒸发器和冷凝器的换热量计算误差在±5%以内;对比分析表明,室外温度为35~60℃,R236fa系统能效比相较于R134a系统最大增加14.7%,在高温区相较于R22/R142b混合制冷剂系统最大增加13.4%。

In order to guide the design of high-temperature air conditioning system, a system steady-state simulation model is developed for the system with high-temperature refrigerant R236fa. The simulation models for the components of the compressor, the heat exchanger, and expansion valve, etc., and a mass-oriented system solution algorithm is developed based on the coupling relationship of each component is developed. The verification shows that, the deviation of the mass flow rate for the compressor is within ±5%, and the deviations of heat transfer rates for both the condenser and evaporator are within ±5%. The comparison results show that, at the outdoor temperature of 35~60 ℃, the energy efficiency ratio of the R236fa system is increased by a maximum of 14.7%than that of the R134a system, and it is 13.4% larger than that of the R22/R142b mixed refrigerant system under the high temperature conditions.