The Analysis And Optimized Research Of The Coupling Between Air-source Heat Pump And Building In Varying Operation Condition In Hot Summer And Cold Winter Area

Given that many designers simply take rated COP(coefficient of performance)and heating capacity into consideration in terms of the performance of air-source heat pumps,leading to an insufficient heating effect of pumps under low temperature condition in hot-summer and cold-winter zone.To solve this problem,some scholars put forward some new evaluation index,such as SCOP and IPLV But these indicators can not make designers and users know the real capacity output and coefficient of the air source heat pump in varying operation condition.They also can not know that whether the pump’s output can satisfy the load demand of the buildings or not.Firstly,the paper compared with the model of air source heat pump and predicting model of building’s demand,notes the shortage of current selection method of pump.The paper established three models of capacity output,energy efficient ratio and dynamic load demand of buildings in summer and winter,respectively,with all the three models tested in varying operation condition.Then it validated that the model considering more effect factors such as indoor and outdoor temperature and outdoor humidity can provide a higher reliability.Secondly,the paper couples the capacity output of heat pumps and load demand of buildings,including indoor and outdoor temperature and outdoor humidity,and makes comprehensive analysis of factors including indoor and outdoor temperature and outdoor humidity on the heat pump performance.It found that the COP of pump in which are selected by rated capacity and COP can drop to 32.7%of the rated COP in bad condition.The COP can not meet the requirements of energy-saving criteria.As a result,the paper introduced three indicators in selecting pumps,namely,pump capacity output,energy efficient ratio in the most unfavorable conditions and a stable operation conditions where the capacity output can satisfy the demand of buildings.With the operation method mentioned above,the real actual performance of the selected pumps and the degree that they satisfy the building load demand can be effectively predicted.Meanwhile,the selection method and evaluation standard of air-source heat pump can be greatly improved.