Experiment Study On The Subcooling Energy Storage Defrost System For Ashp

This subject is supported by the item of National Natural Science Foundation:The System Innovation and Mechanism Research of ASHP Defrost(NO.50606007).In this paper, based on the full study of ASHP(air source heat pump) conventional defrost and phase change storage thermal defrost, the dynamic test platform of a new ASHP defrost system is designed, and the subcooling energy storage defrost experiment process is made. A series of changes are done on the basic of the platform of the phase change storage defrost system, and the cuboid type energy storage tank is designed, which is a key component of energy storage defrost system. Based on the phase transition temperature and heat capacity, and many other considerations, types of binary complex organic phase change materials according to different proportions of the Capric acid and Mistiric acid are selected and the build exothermic effect is ensured.On the basic of three defrost modes'measuring data processing and analysing of the system temperature, pressure, power, frost quantity, defrost quantity and changes in the course of time , dynamic characteristics of the ASHP energy storage system, respone of system heating resume and the defrosting on the impact of indoor environment are researched. System components characteristic change rules between the conventional defrost , phrase change energy storage defrost and subcooling energy storage defrost are obtained. Energy consumption, the impact to the indoor temperature and heating capacity in defferent enengy storage and defrsot modes are analysised. The results show that suction press is risen, defrost time is shorten, air supply comfort is improved, defrosting result is improved in the mode of subcooling energy storage defrost. Furthermore, the characters of a seris of binary complex organic phase change materials are discovered. And theoretical support and technical reserves are given to design air source heat pumps with high reliability.Detailed error analysis is given for the direct and indirect measurement of measurement parameters of the subcooling defrost experiments. The results show that the ends of error can be accepted, and the test results are satisfactory.