Research On The Characteristic And Parameter Optimization Of Multi-Source Heat Pump System In Severe Cold Area

Heating and air conditioning in public buildings and residence became a general demand,it needed to consume massive electric energy and fuel,China’s building energy consumption has accounted for about 30%of total energy consumption,due to the large area and long heating period in cold area,making the proportion of building energy consumption the largest of the heating and air conditioning.The combination of heat pump technology and renewable energy use was a hot research in the field of HVAC,considered the cold and heat load not matching,seasonal heat storage was an effective method to realize the transfer and utilization of renewable energy,it could guarantee stability and reliable operation of the system.This paper summarized the domestic and international research status of the combined heat pump system characteristic and optimization analysis,proposed multi heat source coupled heat pump system for heating and air conditioning which could comprehensively use the solar energy,air energy and geothermal energy,the system could ensure heating and air conditioning need of residents in severe cold area,the research content of this paper included several aspects as the following:Firstly,it introduced that the main operation modes and operation principles in the system,designed the main components for the system included collector/evaporator,water cooling condenser and buried pipe heat exchanger;Secondly,established the mathematical model for the main parts of the system,included the partitioned lumped parameter model of collector/evaporator and water cooling condenser,the lumped parameter model of compressor and throttling gear,the mathematical model for U tube buried pipe heat exchanger.Based on the above models,established the coupling relations for relative parameters of the main components in six operation modes.Designed the simulation procedures of the each pattern and whole system in order to lay the foundation of optimization analysis and system dynamic simulation in next step;Thirdly,on the basic of establishing models and designing procedure,took a building in Harbin as the object,ensured economic optimum and heat balance of the soil,two operating parameters of the close temperature of double heat source coupled heat pump and open temperature of separate type heat pipe,one design parameter of double heat source coupled heat pump’s capacity were selected and optimized,so as to get the best operating parameters and design parameters of the system,guaranteed the system running in the most favorable conditions.Finally,on the basis of the optimization analysis,simulation analysis of the dynamic characteristics of multi-coupled heat pump heating and air conditioning systems,obtained the system’s operating results under different operating modes and the change of soil temperature field.Selected the cold area of China,Harbin,Changchun,Shenyang as the object was calculated,got the running performance of the system in different regions,and the economic and energy efficiency between multi-source-coupled heat pump system and traditional heating and air conditioning system were compared.This paper proposed a multi-source-coupled heat pump heating and air conditioning system,on the basis of taking full account of cold area’s building load characteristics and the renewable resources’ output characteristics,realizing the energy efficient use,transfer and utilization of complementary use;On the basis of guaranteeing the reliability of the system,the heat balance of the soil was maintained.Through the program simulation results showed that the multi heat source heat pump system in the cold region of China had a certain energy saving effect and good feasibility.