Numerical and experimental study of the thermodynamic efficiency of heat pumps
Keywords:
heat pump, semi-empirical thermodynamic model, monitoring, exergy coefficient of performanceAbstract
Proposed the methodology of monitoring of heat pump allows real-time to exercise thermodynamic testing of the heat pump for a limited amount of measured parameters, including operation at partial load. The essence of the technique is that on the basis of data thermodynamic efficiency statistics catalogs of manufacturers of chillers and heat pumps the regression equation is formed for determine the loss of irreversibility in the cycle. This relationship serves as the reference characteristics of heat pump for his diagnosis in real time, with only available data on the coolant temperature at the inlet of the evaporator and condenser, as well as indications of heat and electricity. Monitoring of the heat pump VMN430L in the heating system of the office building showed that this model is mainly operated in partial load operation. This led to a substantial increase in the amount of internal energy dissipation in the cycle and as a result increased power consumption. While reducing the cooling capacity by 50% with respect to full load the irreversibility losses varied by only in 1%. In addition, while raising the temperature of ambient air and below 0 °C and increasing its humidity to 85% significantly reduces the effectiveness of heat pump. Thus, our monitoring showed the ineffectiveness of this model. By the way, it should be noted that revealed by the settlement and pilot testing shortcomings are not typical for the current generation of chillers and heat pumps (for example, chillers Clivet, Trane).
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