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Optimal Analysis of CCHP Based on All-Year Load

Author: GaoWei
Tutor: HuangYueWu
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: CCHP DeST energy efficiency and economic analysis optimal scheme operation strategy
CLC: TU995
Type: Master's thesis
Year: 2010
Downloads: 133
Quote: 2
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Abstract


CCHP is a cogeneration system that can accomplish the production of cooling, heating, and power at the same time by making use of both" waste" heat output created when power is generated. In contrast to the conventional system, it can use energy resources more efficiently, creating opportunities for reduction in both purchased energy costs and in environmental impact. As the energy crisis has been becoming increasingly serious nowadays, distributed generation systems have been built up in developed countries to improve energy efficiency and promote the development of cooling heating and power system. Generations systems, driven by gas turbine, gas engine and fuel battery, have been applied to combined cooling heating and power system(CCHP) in developed countries like USA, UK and Japan.The combined cooling, heating and power system is related on the load demand of cooling, heating and power, but in fact the load of building is changing all the year, so it’s important for us to pay much attention to the studies on the system energy efficiency and economic analysis based on all-year load. In this paper, it studies the influence of the ratio of electric to power, the flux ratio of hot water and the flux ratio of gas to the primary energy rate(PER). Energy simulation software DeST simulates out an office building’s all-year load of hot, cold and power in Harbin, Beijing, Xian, Shanghai, Chengdu, Guangzhou, six cities. For Shanghai, analysis of three CCHP systems compared to traditional system for energy efficiency and the initial investment recovery period, and analyzed the generation electricity net prices on the initial investment recovery period. Analysis of the self-contained cooling heating and power system applications in six different cities, obtained by calculation and analysis that cooling heating and power systems has good economic and energy efficiency compared to traditional system, illustrating that the system in the six cities have promoting values. Combined cooling, heating and power system with a core of a gas engine, a gas boiler, a heat exchanger, an absorption chiller and a electric chiller was analyzed from the optimal operation point of view. By taking the minimal cost meeting the annual load demand of cooling, heating and power as optimizing function, the economic optimization model of the CCHP system was established. The optimal scheme and operation strategy of the system was obtained with real projects. The results show that in the current conditions of electricity and natural gas prices, the optimized system and operation strategy has high economics, and the annual cost of optimized system saves 9.95% compared to traditional system. The scheme of the system is concerned to the energy price. The results show the lower of the gas price, the more obvious economic of the CCHP system in the same electricity price compared to traditional system.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Urban central heating
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