Currently, the design and construction of buildings and building energy systems are far from reasonable. The requirement and consumption of primary energy resources is aggravated, the use of building energy is free and wasteful, and pollution of the earth's atmosphere from building energy consumption is also aggravated. Therefore, the research and applications of energy efficiency and environmentally benign building energy systems are very important and urgent. Until now, much work on building energy conservation methods, measures and evaluations have been done by people in many countries. Some theoretical achievements have been already put into practice, but most of them put undue emphasis on some parts of the whole system. The complete idea of building energy conservation by integrating the building energy systems has not been put forward, and unequivocal guidance and a complete evaluation index and theoretical system for building energy consumption and its impact on the environment have not been formed. In this paper, we make further suggestions for improvement, and present some new concepts such as building energy flow, building mass flow, couple recovering of building discharge energy, integrated system of building energy , factor of building energy integration I, and effect factor on atmospheric environment of building energy F. The positive effects of these new concepts and methods on traditional approaches are also predicted. Theoretical research on an energy recovery unit that recovers cooling energy from indoor exhausting cool air in summer has been done in this paper, and demonstrates great advantages of its integration characteristics of building thermal systems.
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