Transcritical Heat Pump Performance. Based Organic Fluid Simulation

As social and economic development, the world is facing a major social development issues of energy crisis and environmental pollution. Many countries have adopted the necessary measures and means. Our government also attaches great importance to support energy-saving environmental protection, new energy and low carbon technology research and development. Energy consumption of building account for a large proportion of social energy consumption, of which about 80 percent of building energy consumption for heating, ventilation and air conditioning application. Application of heat pump in heating technology will significantly reduce building energy consumption. There is great significance of economical use of energy. There is good economic performance of trans-critical heat pump and the higher coefficient of performance than conventional heat pump when get higher temperature hot water, ther are good prospects and the development potential.The method of determined PT equation of state and derived parameters of thermodynamic through Patel-Teja equation of state and mixing rule. Based on the Vapor-Liquid phase equilibrium and PT equation, Vapor-Liquid phase equilibrium mathematical models of fluids were set up. Thermodynamic property calculations of the selected working fluids show that average error was in the range of 5%, which could completely meet the requirement of precision in practical engineering calculation research computing.Based on the corresponding state principle, migratory property prediction model was built, migratory properties including viscosity and conductivity of working fluids were calculated. On this basis, optimized for the environmental trans-critical heat pump working fluid.Cycle simulation model has been developed to analyze and caculate the trans-critical heat pump system, based on the thermodynamics. heat transfer, fluid mechanics analysis. The cycle performance parameters of trans-critical heat pump compared with the conventional heat pump, the results reveal that trans-critical heat pump have a higher coefficient of performance while output the hot water. Because of the working fluit in high-temperature heat exchanger (condenser) match changes of water temperature.In this thesis, which simulated trans-critical heat pump cycle of R125, R41, R143a and CO2. Analysis of factors that influencing the cycle performance parameters of trans-critical heat pump such as evaporation pressure, compressor discharge pressure, regenerator performance and so on.