Research On Transmission And Distribution Energy Consumption And Evaluation Of Multi-source Interconnected Cooling Syste

With the development of the economy and social progress,China’s energy problem is becoming increasingly tense,with a relatively large proportion of building energy consumption.The proportion of energy consumption in HVAC systems in public buildings continues to grow.Since the beginning of this century,China has been trying to use regional cooling in the construction of new public buildings.Regional cooling has the advantages of efficient utilization of waste heat,saving building space,and peak shaving and valley filling.However,the cooling load of different types of public buildings varies greatly in time,and the energy consumption problems of large pipelines and long-distance transportation have always been unsolvable.This paper analyzes the existing regional cooling systems and proposes a multi-source networked cooling transmission and distribution system.Each user end is divided into energy stations(multiple sources),and connected to each energy station through a pipeline network to achieve energy self-sufficiency for each user during medium and low load periods,with peak load periods supplemented by other energy stations(multiple sources).Compared with traditional regional centralized cooling systems,this system has the advantage that multi-source energy stations are close to user loads,which can reduce cold losses during long-distance transmission and distribution processes,effectively reducing energy consumption,carbon emissions,and operating costs.Firstly,This article starts with user cooling load,cold water transmission and distribution,and evaluation,and compares the centralized transmission and distribution,distributed transmission and distribution,and multi-source networked transmission and distribution of regional cooling systems.It analyzes the circulation mode of cold water transmission and distribution,the characteristic equations of water pumps and pipelines,and the variable load regulation of water pumps.Through typical models,the transmission and distribution power of the three transmission and distribution modes is calculated.Secondly,this article sorts out the evaluation literature,standards,and methods of domestic and foreign transmission and distribution systems,identifies their advantages and disadvantages,analyzes and calculates the load,function score,and life cycle cost of the above three transmission and distribution systems,and calculates the environmental evaluation index,function score index,life cycle cost,and their change rate,and calculates the change rate based on life cycle cost,Based on the relative importance of environmental load and functional scores,the weights of the two are given,and a comprehensive evaluation method is proposed.Finally,a case study was conducted on the multi-source networked cooling transmission and distribution system.A typical equestrian town in Xi’an was used as a case study to simulate the load,select the chillers and pumps used,calculate the energy consumption of the regional cooling pipeline network,and compare it with traditional centralized cooling transmission and distribution and distributed transmission and distribution.The environmental load index,functional score index,and comprehensive evaluation index of the three transmission and distribution methods were calculated.