Optimiztion Analysis Of Distribute Combined Cooling Heating And Power System Based On Solar Energy

With the development of democratical economic, building energy consumption has been increased year by year and energy-related issues have become more and more serious. In order to achieve the purpose of sustainable development, energy savings and pollutant emission reductions, building combined cooling heating and power (BCHP) system has been identified as an alternative to solve energy-related problems due to its energy-efficient and friendly environment benefits. In this paper, a solar BCHP system driven by solar energy and natural gas is proposed to integrate utilization of solar energy and traditional BCHP system.Firstly, the works of four classical BCHP systems driven by different equipments are analyzed. Based on multi-criteria fuzzy methodology combined with grey relation analysis and combined weighting method, the four traditional BCHP systems and separation system (SP) are evaluated from technology, economic, environment and society aspects. The BCHP system driven gas engine is proved to be the best energy system among the five alternatives.Secondly, the energy and emission flows of the solar BCHP system, BCHP system driven gas engine and SP system are described. The two distinctive operation strategies of BCHP system, following the electrical load (FEL) and following the thermal load (FTL), are also analyzed.Then, the whole life of the energy system is dived into five stages based on life cycle assessment (LCA) method. According to the equipments and fuels in the system, the life cycle inventory data and LCA scope can be determined. The life cycle energetic, environment and economic benefits of BCHP system are evaluated from prime energy saving ratio, pollutant emission reduction ratio and relative pay period of BCHP system with respect to SP system.Finally, a commercial office building in Beijing is selected as a case to study the ten-year comprehensive performanaces of the solar BCHP system, BCHP system driven gas engine and SP system. The equipment size and operation strategy are optimized to maximize the benefits of BCHP system in comparison to SP system. According to the optimal results, the life cycle structure, pollutant emission structure and energy consumption structure are analyzed to obtain the optimum design scheme and operation strategy of the solar BCHP system.