Evaluation Of Energy Saving Of Existing Residential Building In An University In Cold Regions

Existing energy-saving residential buildings has been widely expanded in northern heatingareas,but much of its energy-saving effect is calculated by using software simulation before theproject,therefore,we need to spread the evaluation of the actual effects after the implementationof the existing energy-saving residential building projects.This will not only be able to graspthe actual effects after the implementation of the existing energy-saving residential buildingprojects and timely discover problems and then provide guidance for future work, but also topromote the whole process of China’s existing buildings energy-saving work.Based on a large number of documents,and the method of analysising instances.Selectingthe project of energy-saving of student apartments in an university in the Inner Mongolia forthe study, the model of analysising the effects of existing energy-saving buildings projectsestablished from the perspective of energy, economic, environmental and social point; usingthe method of incremental analysis in the evaluation of economic effects,taking the costs ofenergy-saving projects as incremental costs, taking the costs of energy-saving as incrementalbenefit,then takig the indicator of dynamic payback period to measure the economical effectsof the existing energy-saving residential building projects;taking infrared thermal imagingmaps of exterior wall envelope structures to conduct thermal defect analysis; in order todirectly reflect the effect of improving the living conditions of the residents,we comparativeanalysis the indoor temperature before and after the transformation of the energy-savingprojects.Research results:(1) the energy-saving measures of exterior wall envelope structureshave a great influence on the effects of existing energy-saving residential buildings, bycomparing schemes,choosing the method of exterior insulation as the rehabilitation programsfor cold regions facades,choosing the method of inverted roof insulation and flating to pichedroof as the roof rehabilitation programs;(2) the indicator of dynamic payback period is7.44years of the project of energy-saving of student apartments in an university in the InnerMongolia,meet the require of basic payback period of less than10years in the existing energy-saving buildings projects,and the average annual reduction in coal consumption is3445t, reducing heating expenses2116830yuan,also reducing emissions SO256.84tce, CO22308.15tce, NO253.74tce, smoke33.07tce, has significant economic and environmental benefits;(3) after energy-saving of student apartments,the indoor temperature can meet the requirementsof higher than the temperature of the interior design18℃, and the temperature is raised toabout4.165~5.993℃;(4) according to the effect of the project, after the transformation ofresidential buildings can be saved per year of coal19kg. Baotou’s28million square meters ofexisting residential building energy-saving potential for annual savings of532000tons ofstandard coal and reduce CO2emissions356440tce.Analysis model established in this paper, directly reflect the existing energy-savingbuildings fast return on investment, significant economic and environmental benefits andenergy-saving effects. After the work of existing energy-saving residential buildings iscompleted,we should evaluate the effects timely and comprehensive,during the sitemeasurement, it will not only help to promote the correct and effective use of the method, butalso directly reflect the actual energy saving effect for households, in addition data post-processing enable to quantify the economic benefits of energy-saving projects, it can help toexpand the latter part of energy-saving work.