Research On The Trans-critical CO₂ Cold And Heat Supply System Complementary Of Solar Energy And Air-source

In recent years,with the rapid development of the global economy,the world’s demand for energy is increasing,and the growth of building energy consumption is also increasing rapidly.The importance of energy conservation and emission reduction is self-evident.Solar heat pump technology applied to building heating is of great significance in the social background of energy saving and emission reduction.However,the application of solar heat pump technology is also accompanied by many technical difficulties,such as how to choose the capacity of the solar heat pump system to better meet the demand of building load,and how to better coupling the solar heat system with the heat pump system.In view of the above problems,this Paper designs a solar energy and carbon dioxide heat pump complementary cold and heat supply system with inter-seasonal heat storage,which is used to meet the cooling and heating needs of the building in the whole year.Firstly,this paper analyzes the distribution of solar energy resources in China and the meteorological conditions in Beijing.This article selects in a building area of 214m2 in Beijing as a case analysis,through the DeST-h software to simulate the cold heat demand of the whole year,under the condition of the construction in the year of the hourly distribution of cold and hot load based on the system design and optimization.Aiming at the load demand of the building and the characteristics of CO2 heat pump and solar energy,this paper designs a set of cold and heat supply complementary system with CO2 heat pump,solar heat collection system and heat storage system as the main equipment,and conducts simulation analysis on the operation of the main equipment of the system.On the basis of meeting the annual load of the building,the capacity of the system equipment is selected by comparing the annual operating cost and solar energy guarantee rate of different capacity schemes.On this basis,the comprehensive performance of the heating system is analyzed by comparing the economy,energy and environmental protection of different heating systems in heating season.The results show that the solar energy and CO2 heat pump complementary system has better economic,energy and environmental performance than other conventional heating methods.