Abstract：

Establishes a primary theoretical frame to analyse this process by thermology. Setting the reasonable heat transfer capability according to the temperature difference between indoor and outdoor air is the key to transport heat through envelope. The temperature between indoor air and heat source or sink drives heat transfer in air conditioning system and the relationship of temperature and heat should be considered in choosing heat source or sink. To reduce transfer links and temperature difference of each link based on a satisfied need of heat transfer is the matter to reduce energy use and some possible ways to reduce the temperature difference are obtained by means of analyzing influencing factors. Also discusses the transition between moisture transfer driving force and heat transfer driving force.

Keywords:thermal-hygroenvironmentbuilding,buildingenvelope,airconditioningsystem,temperaturedifference,energyconservation