The Analysis Of Energy Consumption And Study On Energy Saving In The Public Buildings' Cold Sources System

With the development of urban construction,building energy consumption is growing and building energy conservation is increasingly become an important issue of social concern.The energy consumption of public buildings' cold source system,thus analysis energy consumption and research energy conservation to building cold source system has important theoretical and practical significance.This thesis analyzes the characteristics of building variable flow cold source and the influence of variable chilled water flow and variable cooling water flow on the air conditioning system.Simulation model of components in building cold source system,including chillers,cooling tower,water pump parts and so on,and simulation model of Building cold source system is established.A office building in Beijing as the research object,get the hourly cooling load of the research object during cooling season by the DeST software,and analyzes the building cooling load distribution,and determine five kinds of matching scheme can be used.The operation of air conditioning systems can be observed with TRNSYS simulation software when the simulation construction cold source system is based on five kinds of matching scheme,chilled water system adopts variable flow system and cooling water system adopts constant flow system,get cold source system energy consumption,operating cost and energy saving effect and comparative analysis that.With the development of urban construction and the increasing building energy consumption,building efficiency is becoming an important issue of social concern.Since the energy consumption of public buildings' cold source system has occupied a big proportion in building energy consumption,the analysis of energy consumption and the study of energy conservation to building cold source system has important theoretical and practical meaning.This paper analyzes the characteristics of building variable flow cold source and the influence of variable chilled water flow and variable cooling water flow on the air conditioning system.Simulation model of components in building cold source system,including chillers,cooling tower,water pump parts and so on,and simulation model of building cold source system are established.This article is based on an office building in Beijing as the research object.We get the hourly cooling load of the research object during cooling season by the DeST software,analyze the building cooling load distribution,and determine five kinds of matching scheme that can be used.The operation of air conditioning systems can be observed with TRNSYS simulation software when the simulation construction cold source system is based on five kinds of matching scheme,chilled water system adopts variable flow system and cooling water system adopts constant flow system.The information of energy consumption,energy charge of water chilling unit and energy-efficient is available from the software further analysis is carried out.The simulation of the cold sources system shows that the distribution of cooling load in this office building is very uneven during the cooling season,mainly between 4500-5300 hours,and there are 57.61% of the time running rate below 10% in the whole running time;Through analyzing the simulation results of different schemes,,we can get reasonable matching of chiller,raise the efficiency of the chiller,reduce the energy consumption under the same condition of cooling load.Comparing the best scheme of the five and other schemes,the largest difference of total energy consumption is 139290.13 kWh,and the difference of the proportion of running time is 26.63% when water chiller load rate exceed 60%;The frozen water pump with frequency conversion technique can reduce the energy consumption of water pump effectively,and frozen water pump energy saving ratio is different under variable frequency in different schemes,the saving ratio between 17.55% and 29.32%.