The Application Research In Buildings Of Distributed Energy System

Distributed energy which is a new direction in energy field across the world, usually in the form of polygeneration and multifunctinal system, presents huge potential for its dominant position in combined cooling, heating and power systems. The GT-CCHP systems can independently supply three kinds of energy forms to a building or neighborhoods.Besides, combined with other distributed generators in a DES, the GT-CCHP systems can play an important role.The theoretical study on dynamic integration of energy usage in buildings with DES is of great significance, which sets a definite purpose for energy system, brings about a revolutionary change in building research and adds opening source on energy usage reduction in energy saving study.Firstly, the working principle, characteristics and system integration of building CCHP system are analyzed and evaluation indicators applying to building CCHP system are defined, including economic exergy efficiency and relative energy saving rate, total energy utilization ratio also outlined in evaluation system. Then, a deep research is conducted on the design condition of GT-CCHP system, the thermodynamics and economic characteristics. The effect absorption chiller/heater's properties have on CCHP is emphasized. This paper takes the energy simulation of a teachers'apartment in Changsha as an example to demonstrate the advantages of CCHP system over separated system. Besides, theoretical study is shown about the part-load working conditions of GT-CCHP system, including the off-design condition characteristics of each subsystem. It is concluded that CCHP performance deteriorates remarkably with the decrease of load on part-load condition. The measurement to improve the performance of CCHP system under full-load conditions is proposed. It's found that the combination of storage system with CCHP and using the gas turbine with adjustable waste heat function can improve the system performance well under part-load working condition.The existing evaluation norms are discussed in this paper and the norms guiding practical application and system optimization are determined, conducive to the development of cogeneration system. The characteristics of GT-based CCHP system under full-load and part-load conditions are revealed, providing design and operation optimization for this form of cogeneration system. The research results in this paper act as a guidance for the application of gas-based CCHP system on buildings.