| China’s building energy consumption accounts for 30% of total energy consumption, how to reasonably develop and utilize solar energy, to reduce building energy consumption and environmental pollution, has become an important focus of industrial development and research on the field of building energy conservation and new energy. Solar cogeneration technology(PVT) is a new way of depth exploitation of solar thermal, photovoltaic resources while simultaneously. In the aspect of improving the utilization efficiency of solar energy, and promoting the development of energy conservation, it has broad market prospect and popularization value.In order to carry out the engineering application of solar cogeneration technology in northern China, it is very necessary to study the form of system, key technology of engineering development, and to analyze the application’s economy. In this study, we take the laboratory of central air-conditioning intelligent control system in Dalian University of Technology as the thermoelectric supply target. Firstly, according to the conventional electricity load and winter heating load design requirements of the laboratory, based on the analysis of the existing solar cogeneration system forms, designed a generating capacity 7.56kW solar cogeneration system. Secondly, carry out the designing, developing and self-manufacturing of 36 new PVT cogeneration component, and the performance testing. Construct a 7.56kW solar cogeneration system demonstration project, complete the thermoelectric performance monitoring system construction and running debugger of the system. Thirdly, complete the cogeneration characteristic test of the system in the transition season and heating season at 2015. Then analyze the operational characteristics of the system in detail based on the performance test data. Finally, based on the results of solar thermal test data and photovoltaic theory calculation, complete the technical and economic analysis and payback period analysis of the demonstration project, it provides technical reference for the promotion and application of this technology.The results showed that, the solar cogeneration system designed in this study, can accumulate about 288MJ heat (equivalent to 9.8kgce) and 30kWh electric in the heating season sunny condition, the average total generating power is 6kW, heat collection efficiency is about 23%, the integrated photoelectric conversion efficiency is 15%. While in the transition season, the accumulation of heat is about 320MJ (equivalent to 10.9kgce), the accumulation of electric is about 31kWh, the average total generating power is 6.2kW, heat collection efficiency is about 28%, the integrated photoelectric conversion efficiency is 15%. According to the technical and economic analysis, the total fixed cost of the engineering project is 118,161 yuan, the system is running at a cost of 2,336 yuan per year. Associated with the subsidies for solar photovoltaic power generation in the state and the region, the heating charges and the conversion of thermal output to coal, the annual income of the project is 12,777.84 yuan, the dynamic investment recovery period is 11.32 years, the total annual energy savings is 3.45 tons of standard coal. |
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