ABSTRACT
Building heating and cooling load calculations can only be undertaken if the heat transfer mechanisms between the building walls, the internal and surrounding environment are identified. Heat transfer through building walls is caused by a difference in temperature between the exterior, interior surfaces of the wall. Various heating, cooling load calculation techniques are in use; however, the emphasis here will be on the methods recommended by the UK Chartered Institution of Building Services Engineers. In multi-layered constructions, it is the inside surface layer which primarily determines the admittance. The admittance procedure for cooling load calculation recognises that a person’s feeling of thermal comfort depends on the heat exchanges between the body of a person to the indoor environment, by convective heat loss to the indoor air and by radiant heat loss to the indoor environment. The cooling load is influenced by the characteristics of the heat emitter in the space and the temperature used for the control of the system.
