Abstract
The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit is about 1 kW, and the work refrigerant is R22/R407C/R410A/CO2. The MATLAB/SIMULINK software was employed to build the simulation model. The thermodynamic simulation model is significant for the optimization of parameters of the unit, such as condensation and evaporation temperature and mass flow of the sanitary hot water and size of hot water storage tank. The COP of the CCP of R410A system is about 3% - 5% higher than the CCP of the R22 system, while CCP of the R407C system is a little lower than the CCP of R22 system. And the CCP of CO2 trans-critical system has advantage in the hot supply mode. The simulation method provided a theoretical reference for developing the production of CCP with substitute refrigerant R407C/R410A/CO2.
Highlights
One of the most widely used building heating and cooling equipments in resident in China is the air-cooling heat pump unit
This paper presents a general simulation model for a system supplying sanitary hot water, heating, and cooling loads
The total COP of the compound condensation process (CCP) system with R410A is about 3% - 5% higher than the CCP system with R22, and the CCP system of R407C is a little lower than the R22 system due to their thermal characteristics
Summary
One of the most widely used building heating and cooling equipments in resident in China is the air-cooling heat pump unit. The compound condensation process (CCP) has been an industrial standard. The thermodynamic characteristic of the two condenser condensing system should be studied. The finite time thermodynamics is used to set up the time series simulation model and the software CYCLEPAD is used for the simulation of the compound condensing process [2]. An upper bound of recoverable condensation heat for the compound condensing process is obtained which is in good agreement with experimental result. The thermodynamic characteristic has been studied in the one stage decentralized chiller in south China with R22 [3]
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