高温热泵系统稳态仿真

STEADY STATE SYSTEM SIMULATION OF HIGH TEMPERATURE HEAT PUMP

针对水-水高温热泵实验台建立了系统稳态仿真模型。模型输入参数为系统结构参数和载热流体参数,输出参数则为系统性能参数和换热器温度场。采用P-T状态方程计算工质相平衡性质,故模型适用于新型纯质和混合工质。在压缩机建模中,根据实验数据辨识拟合了压缩机容积效率、定熵效率和热效率,在两器模型中考虑了压降和输运性质对换热过程的影响。对比实验数据,表明模型精度在10%以内。

The steady state computer simulation model was developed for heat pump circuits of high temperature heat pump experimental apparatus. The simulation model includes hermetic reciprocating compressor, expansion valve, tube in tube evaporator and condenser. The main inputs to the model include the physical details of the heat exchangers and the compressor, mass flow rates of heat transfer fluids and their inlet temperatures to the evaporator and the condenser. The outputs of the model include system performance parameters and temperature field of the heat exchangers. The model can be applied to new pure and mixture working fluids for phase equilibrium calcula- tion based on P-T state equation. The efficiency-based compressor model was built and the method to identify the efficiencies, e. g. volumetric efficiency, isoentropic efficiency and thermal efficiency, was introduced through experiments The influence of pressure drops and transport properties of the working fluids on heat exchanger model was considered. Model results deviate from that experimentally obtained within a 10% range.