STATIC SIMULATION AND EXPERIMENT OF CO_2 HEAT PUMP WATER HEATER

摘要

The purpose of this study is to develop the system simulation model for the CO_2 heat pump water heater andrninvestigate the validity of this model by comparing the simulation results with the experimental results. Therndetailed models of each component -the gas cooler, evaporator, compressor and expansion valve- arerndeveloped. And total system is analyzed based on the modular analysis method that has been made by ourrnauthors. Experiment is also carried out using the actual machine whose heating capacity is 22.3 kW andrnsupplied hot water temperature is 90 ℃.rnEffects of the inlet water temperature and the outside air temperature on system characteristics -COP, heatrnexchanger rate, refrigerant flow rate and so on- are investigated by both the simulation and experiment. As arnresult, the static simulation model of CO_2 heat pump water heater was developed. For example, the precisionrnof this model was found to be within 3.6% compared with the results of experiment.