Abstract
Building energy efficiency and index evaluation system was not only the important key to decide whether a building was energy saving or not but also method of the result of the evaluation system. By analyzed a large number of representative data and relied on the theory analysis, investigation on the spot, simulation, experimental test and expert evaluation, a complete set of scientific evaluation system, evaluation method and quantified evaluation index coulD be established. At the same time, it could be found why the building energy efficiency was low. That might offer the scientific basis to the policy of the building energy efficiency, and also provided the technical consulting, technical training, design of system and construction for the society and users. It could brighten the future of the evaluation system in China.