Research On Optimization Of Cooling Heating And Power System Based On Different Types Of Building Mixing

In the context of today's global promotion of sustainable development strategies,issues such as adjusting energy structure,improving energy efficiency,enhancing energy use safety,and reducing environmental pollution need to be resolved.Compared with coal and oil,natural gas as a clean energy has obvious advantages in reducing environmental pollution.In recent years,it has been deeply researched and promoted nationwide.The natural gas-fired combined cooling heat and power system?CCHP?,on the basis of energy cascade utilization,achieves simultaneous cooling,heating and power supply,and has the advantages of high energy efficiency,good economy and low pollution.Therefore,the research of the triple supply system has become an important topic in the development of new technologies in the country.However,in practical applications,compared with the traditional energy supply system,the triple supply system does not mention its theoretical advantages,and even many failure cases.One of the most important reason is that the system side and the building load side are not well matched,resulting in wasted energy and poor environmental protection.According to other people's research,the energy efficiency of the triple-supply system is low due to the high volatility of the residential buildings,and the economic benefit is very poor.Therefore,this paper proposes to mix residential buildings and public buildings in proportion,and improve the energy and economic benefits of the triple supply system by increasing load stability.Firstly,according to the climate characteristics of Tianjin,the DeST load simulation software was used to simulate the four-year-old load-time simulation of four public buildings—hotels,shopping malls,hospitals,and residential buildings—and set the five building areas to be the same.Then mix the residential building with the four public buildings in 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,respectively.The load of the hybrid building is matched with the triple supply system.Secondly,with the traditional distribution system as the reference object,the primary energy saving rate,the operating cost saving rate and the carbon dioxide emission reduction rate are optimized.The model of the triple supply system coupling the traditional triple supply system and the supplementary combustion boiler and the power grid is established and transformed to optimize the problem.Then,the application scope,advantages and disadvantages of each optimization algorithm for different optimization problems are compared and analyzed.Finally,the genetic algorithm is used to optimize the system model under certain constraints,and the objective function values of each mixed building group are obtained.With the CO₂emission reduction rate as the standard,the residence-hotels with the best mix of 0.1are the best;from the perspective of primary energy conservation rate,the residence-stores with the mix of 0.1 have the highest returns,while the economy and comprehensive benefits are compared,the residence-office building has the highest efficiency.This study provides a theoretical basis for the application of the triple supply system in China,with a view to improving the current situation of the low application rate of the triple supply system in the residential sector.