Terminal Optimization Of Distributed Heating System Based On Load Change

With the development of central heating and the improvement of people's living standards,more and more people can get a comfortable living environment,and energy consumption is also increasing.Mainly because the thermal energy utilization rate of the traditional central heating system is not very high.Compared with the traditional central heating system,the distributed heating system has many advantages such as high hydraulic stability,strong adaptability to load changes and energy saving.In addition,for large urban central heating systems,the secondary network of the heating system is equivalent to the end of the entire system.If you want to achieve the on-demand allocation of heat in the distributed heating system,you need to choose the appropriate operating adjustment mode and control strategy.The system heat load is the basis of system operation regulation.This paper first analyzes the influencing factors of load change.The residential building model was established by using TRNSYS software,and the influence of geographical location,meteorological parameters and human factors on thermal load changes was analyzed.The change of heat load is zonal and random.By comparing the thermal load changes in severe cold regions and cold regions,it is found that the meteorological parameters in severe cold and cold regions are different,but the laws of thermal load changes are roughly the same,indicating that the heat load in one region is obtained.The law of change is equally applicable to another region and has certain universality.When determining the thermal load of the system,due consideration should be given to human factors in order to make the final heat load more representative.Secondly,the distributed frequency conversion water heating system was studied.Based on the thermal characteristics of the four-way water mixer of the end device,the heat balance equation was established.The relationship between the return water temperature and theoutdoor air temperature of the first and second heat networks is obtained,and four operational adjustment combinations are proposed.The operation adjustment curves of four adjustment schemes are obtained by Matlab programming.The corresponding control strategies are proposed for different adjustment schemes.Then use TRNSYS software to simulate the operation effect of distributed variable frequency water mixing and heating system in four operation adjustment schemes.From the perspective of economy and energy saving,the four operational adjustment combinations are analyzed.It is concluded that the first and second networks are the best in economical and energy-saving adjustment of the isothermal difference,indicating that the reasonable operation adjustment mode can optimize the heating system..Finally,the variation law of water distribution ratio of four-way water mixer in these four operation regulation schemes is studied,which provides a basis for the use of four-way water mixer.