Simulation Research Of Micro-turbine CCHP System For Commercial Building

With the rapid economic development of our country,the demand of people for cold,hot and electricity energy is increasing,but the energy and environmental problems were very prominent under the traditional energy supply situation.Comparing with the traditional energy supply system,Combined Cooling,Heating and Power(CCHP)system has the advantages of efficient,energy saving,environmental protection and it can balance the power grid and the gas pipeline network.So,the CCHP system has receiving more and more attention from the world.In this paper,a commercial office building is studied in Bei Jing.The best configuration of the CCHP system is determined and the different operating models of system are studied.Firstly,the DeST software is used to calculate the energy consumption,year hourly cooling and heating load,and the annual hourly electricity load is calculated by the use of area index method.Then,combined with the actual conditions of the building users,the main components of the CCHP system in this paper is determined,including micro-combustions engine and a double-effect lithium bromide absorption chillers.Finally,based on the characteristics of the building load,the Simulink simulation system of MATLAB software is used to simulate the optimal capacity of the micro-combustions engine of the CCHP system in this paper and the optimal capacity is 1600 kW.The major corresponding equipments are selected to complete the specific capacity configuration of the system.In this paper,comparing with the traditional separation system,the energy consumption,economy and environmental protection performance of the system under the four operating modes are further studied,containing the non-partitioning following-the-thermal load model,non-partitioning following-the-electrical load model,partitioning following-the-thermal load model and partitioning following-the-electrical load mode.The results show that when the system is operating in partitioning following-the-electrical load mode,it has the best energy,economic and environmental performance,but it also has the most serious energy waste with 7475093 kW·h.In this paper,the system operation will be optimized based on the principle of not generating waste heat and residual power.The optimized operating mode is that through switching the two traditional partitioning modes,the excess heat and residual power will not be generated throughout the year.By further studying the performance of the system in the optimized operating mode,it finds that the energy consumption,economic and environmental performance of this system are in between the two traditional operating partitioning modes,and its overall operating condition is relatively balanced.