| Building energy simulation is a complex systematic project, involving softwaresselection, building model setting and parameters input.Energy consumptionsimulation softwares are the assessment methods and tools for the green building,play an important role on the process of green building assessment, and have ansignificant impact on evaluation results of the green building energy efficiency.Atpresent, there has been a tremendous kinds of energy consumption simulationsoftwares, however, large discrepancies between different energy consumptionsimulation softwares due to what the devoloper focus on is different, which will havea impact on evaluation results of green building energy efficiency.This paper is based on three kinds of energy consumption simulation softwaresincluding DeST，eQUEST and IES which are applied usually in Amercia and China,setting up a typical building model, and the energy comsuption simulationdiscrepancies are analyzed between three softwares through the simulation results. Itis found that the calculation method of cooling load, the indoor radiation heat transfermodel were main reasons which result in the discrepancies of three softwares. Thediscrepancies are following: Firstly, the cooling load thermal models caused byinstantaneous heat gain of non-transparent envelope structures are different. Take theIES simulation result for the basis of comparison, the maximum deviation is up to38.8%between DeST and IES, and is up to14.8%between eQUEST and IES.Secondly, the cooling load thermal models caused by solar radiation heat gain throughexterior windows. Take the eQUEST simulation result for the basis of comparison,the maximum deviation is up to35.4%between DeST and eQUEST, and is up to14.8%between IES and eQUEST.By comparing energy-saving standard for building between China and America, nineenergy comsuption influencing factors are selected, and the singe factor account forthe impact for the simulation result is analysed. Meanwhile, the impact of energycomsuption influencing factors for three softwares on building energy consumptionare quantitative analyzed, and relations of three softwares between energy comsuption influencing factors and building energy comsuption are obtained. it is found that thechange of the building envelope thermal coefficient, host performance coefficient andthe out door meteorological parameters coefficient have the greatest impact onbuilding energy consumption by the simulation results of three software comparisonanalysis, and then the fan and pump efficiency coefficient, design temperature ofindoor and supply air temperature difference of indoor have great impact on buildingenergy comsuption, the light density and occupancy density coefficient have theweakest influence. At the same time, the energy consumptions of parameters providedby Design Standard for Energy Efficiency of Pubilc Building and ASHRAE90.1-2007are contrasted, and it is found out that the focus of two standards are different, forexample, building energy efficiency is improved from occupancy density and indoorair temperature difference by Design Standard for Energy Efficiency of PubilcBuilding, but ASHRAE90.1-2007considers building envelope thermal coefficient andhost performance coefficients as building energy efficiency focal points. This studyprovides a basis for the design and reformation of energy efficiency in building.Then, take the Wanke headquarters building for example, and the difference ofenergy-saving indexs between three softwares with reference of Amercian andChinese green building evaluation standards are contrasted. With reference ofbuilding energy efficiency standards in China, the results indicated that theenergy-saving rate are33.70%for DeST,34.56%for eQUEST,32.30%for IES, andall meet the energy-saving indexs of Green Building Evaluation Standard. When thebuilding energy efficiency standards in America are used to refenrent, the simulationresults are21.60%、23.35%and20.17%for DeST、eQUEST and IES, and the LEEDscore is3,4,3. |
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