The Application Research Of Air Source Heat Pumb For Heating In The Winter Olympics Ski Venue

Heat pump technique is a kind of effective energy saving method by absorption of lowgrade energy to achieve the purpose of heating or cooling.This technique saves a large amount of high-grade electric energy?natural gas?coal and fuel,which reduces CO₂ emissions. So it has great economic benefit, also has great social benefit,up to the present basic policy of our country's energy and environmental protection.Air source heat pump has been widely used in middle-Low Reaches of Yangtze River. Due to the low temperature adaptability and frosted problems of the unit,air source heat pump as a heat source heating system application is relatively slow In the vast northern region.Nowadays,air source heat pump system on the basis of mature air-conditioning refrigeration functions, is overcoming shortcomings and greatly improving the ability of normal heating in low temperature environment.Two kinds of air source heat pump heating system are proposed in this paper,the first one is R404 A air source heat pump system. Refrigerant R404 A has been widely used in the refrigeration system. However, the refrigerant R404 A is directly applied to the study of air source heat pump heating. According to the specific parameters of the R404 A air source heat pump unit build mathematical model simulation. The second is the CO₂ air source heat pump system. Most of traditional researches aim at CO₂ heat pump water heater, and less reasearch about CO₂ as a source of heat for air source heat pump applied in heating system research. This system solves the system when the traditional CO₂ air source heat pump return temperature high thermal efficiency of key technical bottlenecks.These two air source heat pump heating systems applied in the ski venue of the 2022 winter Olympics and tested for a period of 72 days in the coldest period season. R404 A and CO₂ air source heat pump units run in good condition when the average outdoor temperature is-11.65?. Test results show that the average daily COP of the R404 A unit is 2.25, and the exhaust temperature is lower than 90? when the average effluent temperature is 38?. The average daily COP of the CO₂ unit is 2.17, and the exhaust water temperature is lower than 125? when the average effluent temperature is 62?. High exhaust water temperature makes the CO₂ air source heat pump as the heat source directly used for radiator heating. Indoor temperature, hot water outlet water temperature and indoor comfort are all up to the requirements of the users during the test period. Test results and comparison of simulation results are in good consistency.Drawing the law of air source heat pump frosting and defrosting in Zhangjiakou, Hebei province through the test. Concluding different heating units of defrosting process impact on inlet and outlet water temperature. The other problems and solutions in the air source heat pump heating system as a heat source are summarized for the application of air source heat pump in Zhangjiakou and even the whole northern region to provide practical experience and guidance.Compared the actual investment and its operation with the traditional way of heating in some aspects, such as: economic, energy efficiency and environmental benefits. Drawing an conclusion that air source heat pump in the northern region has excellent economic efficiency, better energy saving and environmental protection benefits.