Study On Design Optimization Of Multi Performance Parameters In Nearly Zero Energy Residential Building's Scheme Phase

With the acceleration of China's urbanization which has led to the continuous development,the scale of China's construction industry continues to be expanded,thereby it driving the increased energy consumption and carbon emissions growth.Nearly zero energy buildings(NZEB)because of its low energy consumption,high efficiency,little environmental pollution characteristics and good comfort,is gradually well known and accepted.It has become the key to deal with current building energy efficiency,and promote energy revolution in the field of architecture,control the total energy consumption.The architectural design stage is the source of building energy-saving technology.Meantime,so the research of this paper is an important way to promote the development of nearly zero energy buildigns.This paper takes the NZEB demonstration center of Shenyang Jianzhu University as the research platform,and selects the multi performance parameters that affect the building energy consumption and determines their threshold.Using SketchUp,OpenStudio and EnergyPlus software to design and optimize.First of all,through the establishment of the basic model and detailed energy consumption simulation,the energy consumption index of the demonstration building is verified.Secondly,energy consumption is simulated as the target to optimize external thermal insulation thickness,typical exterior windows,window to wall ratio(WWR).According to the contribution rate of energy-saving calculate the effect of energy-saving;the combination of multiple performance parameters to determine the energy consumption simulation,choose the most energy-efficient solutions;energy consumption for the scheme of the simulation results to calculate building life cycle cost,choose lowest cost program,analyze economic benefits;for the energy consumption simulation and life cycle cost,which based on relationship study before,choose the combination of most energy-efficient and best economic benefits,calculate the contribution rate of energy-saving and economic benefits.Finally,through the comparison and analysis of the actual test data,this paper get the difference and reliability of NZEB's design.The study concluded that when design a parameter of NZEB in severe cold area the insulation thickness of exterior wall should be 280-320mm,roof is 260-300mm,contribution rate of energy-saving(R)is 9.72-11.03%and 9.83%-10.29%respectively;East(West)WWR is 11.59%-15%,R is 15.76%-16.75%;South WWR is 9.93%-22.5%,R is 12.92%-16.13%;North WWR should be larger than 10.66%to meet the lighting requirements.Study on multi parameters combination show that the most energy-efficient and best economic benefits scheme is:insulation thickness of external wall is 320mm,roof is 260mm,the outside window should be B brand PAS 125 with K value of 0.9W/(m2·K),WWR is 12.5%,the life cycle cost is RMB 810.1 thousand,R is 16.57%,compared with the most energy-efficient scheme,the difference of energy consumption is only 0.83GJ,energy-saving is only 1.27%,compared with maximum life cycle cost plan is RMB 140.8 thousand,compared with the minimum it is only RMB 1.9 thousand.Based on the test of Shenyang Jianzhu University nearly zero energy residential buildings demonstration center,the results showed that the average heat transfer coefficient of experimental demonstration center of exterior value and design value is only 0.016W/(m2·K),which also shows the performance design of nearly zero energy residential buildings can be implemented very well under the guarantee of construction.The same performance parameters,different values,will not only effect energy-saving results,but also economic benefits greatly.Therefore,the performance-based design is a necessary means to achieve the goal of "near zero energy consumption" for the scheme stage in severe cold areas.Meanwhile,this study provides a reference for the design of nearly zero energy residential buildings,creating favorable conditions for improving the initiative of architects,and contributing positively to the establishment of related near zero energy consumption standards.