Optimization On Applying CCHP System To Typical Building Types

As energy issues become more popular, our country’s energy consummation is beingadjusted. Energy saving and environmental protection become the future development trend.Cooling heating and power system as an environmental friendly technology which can use theenergy step by step are facing the promising future. However, the CCHP system has moreequipments and the coordination between them are complicated, so there are still manyproblems in application, such as a reasonable match the system to the mutative loads, theoption of equipment configuration and operation strategy. In order to show the advantages ofthe CCHP system, it is necessary to make corresponding solution to above questions. Thispaper takes the typical building as an example, aiming to solve CCHP system configurationoptimization problem of different types in different regions for providing preliminary designplan to projects.This paper firstly made several energy consumption simulations on typical publicbuildings. Combined with data in the Design Codes, we get the load characteristics of officebuilding and shopping mall in Beijing, Shanghai and Guangzhou and analysis the proportionof impact factors contributed to the loads. Then according to the Japanese CCHP handbook,we draw our own loads coefficients of the above buildings types in Beijing, Shanghai andGuangzhou. This paper also collected some other information about applying the CCHPsystem including electricity prices, gas prices and encouraging policies.After getting the basic loads data, this article built mathematical models to the2typicalCCHP systems’ key parts like the gas turbine and the gas engine, primary analyzed the gasturbine, gas engine equipment characteristics and application characteristics. This article alsogot waste heat water heater chiller and other auxiliary equipment mathematical model.Based on the above model, taking the lowest total annual cost as objective function, thispaper built a mixed integer nonlinear programming model to the two typical systems. Withthe help of LINGO software solving the problem in using branch and bound methodcombined with sequential linear programming method, we got optimal equipmentconfiguration and operation strategy of different building types in different regions.Finally, further study made based on the above results, taking the Beijing office buildingand Beijing shopping mall as the example, this paper calculated CCHP system investmentpayback period and net benefit index which can show the advantages of the CCHP system andanalyzed the price system’s impact on investment payback period. We can see whether theBeijing office buildings CCHP system or the Beijing shopping mall CCHP system, thecogeneration system benefits are better than the conventional system. And gas engine system is more suitable for the smaller construction area building. Beijing Office building system’sinvestment payback period is shorter than the Beijing shopping mall due to the market systemis not operated in transition seasons. In addition, Beijing is more suitable for applicationCCHP system than Shanghai and Guangzhou, but Shanghai and Guangzhou have their ownadvantages in using the CCHP system. Last, electricity and gas price have big affect on theinvestment payback period, and the heating and cooling price have a relatively small effect onthe investment payback period.