Study On Operation Optimization Of Natural Gas CCHP System For Climate Change

Natural gas combined cooling heating and power system(CCHP)is widely used in building energy supplies because of its advantages of high energy utilization efficiency,lower pollution emissions and cascade utilization mechanism.The type of system can effectively alleviate the shortages associated with traditonal energy depletion,and meet increasing demand energy consumption in different building.However,at present,the natural CCHP system has many influencing factors and complex structure,which leads to unreasonable system scheme configuration;In particular,fluctuations in meteorological elements,such as temperature and radiation in changing climate conditions,have increased the difficulty of accurately forecasting loads and result in an imbalance in energy supply and demand,creating greater difficulties and challenges in providing a reasonable system operation strategy.Therefore,this research investigated the case study of a hospital in Siping,Jilin Province,innovatively applying the regional climate simulation software tool PRECIS to predict the temperature and radiation changes in this region over the next 80 years.The prediction results were then used as inputs to the De ST software to accurately identify the user load fluctuations and the change in system output caused by climate change,respectively.Furthermore,we integrated the user load fluctuations into the operation optimization model of the CCHP system,which realized the first combination of climate change evaluation,users’ demand prediction and operation scheme design and generate appropriate system operation schemes in different climate change scenarios and years.The model solution results show that in the same RCP scenario,the user-side cooling demand increases annually;in contrast,the heating demand decreases over time,and the increase in cooling demand and the decrease in heating demand in RCP8.5scenario are larger than those in RCP4.5 scenario.These changes directly affect the output of the whole system.In addition to external meteorological factors,the cascade utilization mechanism of energy in the system will also affect the output of equipment,which also reflects the advantages of the whole co-supply system in improving energy utilization efficiency.Compared with the traditional model,the operation scheme generated by the model adapted to climate change can effectively alleviate the insufficient energy supply caused by the extreme high temperature in summer under the climate change condition,and avoid the phenomenon of excess energy supply of the system under the "warm winter" condition in addition,this model improving the economics of the system while providing effective energy supply services,while improving the economics of the system and providing effective technical support for future energy conservation and energy supply stability.