Research Of Performance On CO₂ Air-source Heat Pump

At present our country is in the rapid development of social economy and science and technology strength increasing stage, the energy consumption speeds growth in increase year by year, since more profligate energy utilization mode has the serious influence to the environment safety and energy problems, the most serious and also the source of environmental problems is the ozone depletion, the destruction of the ozone layer caused a series of environmental problems, such as the greenhouse effect, rising temperatures, sea level rise, desertification, skin diseases, etc.Therefore, protect the earth’s environment, has become every citizen in the development of social responsibility, also is the duty of every citizen.As the living standard of people rise, the comfort of the living environment is getting higher and higher for people, and the air conditioning is an effective way to improve the living environment comfort, so the use of air conditioning is subsequently widely popular, but so that air conditioning energy consumption and CO2 emissions rise, that is not in conformity with the construction of a resource-conserving and environment-friendly society in our country.So the air source heat pump, with its high efficiency, energy saving and environmental protection advantages in many air conditioning, and is loved by many consumers.As a natural refrigerants, CO2 get the favour of the researchers, for CO2 across critical cyclic gas cooler has higher exhaust temperature and large temperature glide, matching with the process of the rise of temperature of the cooling medium, which make it have the unique advantages in the aspect of heat pump cycle, so it is suitable for making high temperature hot water.This article based on the simulation calculation of four different carbon dioxide transcritical cycle, mainly discusses that the exhaust temperature of the gas cooler and the exhaust pressure of the compressor influence on the performance of the system.Results show that reducing the exhaust temperature of gas cooler can improve the performance of the system, there is a exhaust pressure of the compressor to achieve best performance of the system and the pressure is called the optimal pressure.By comparing four different circulation system, the fourth cycle is the best.