Energy-saving Retrofit Of A Training Building In Severe Cold Climate Zone Based On Thermal Comfort

With the development of the economy,the problem of energy shortage has been paid more and more attention,and the proportion of building energy consumption has been increasing,especially for public buildings located in cold regions.University buildings,as existing buildings with a high utilization rate,have a high proportion of building energy consumption and a large density of users.Therefore,on the premise of satisfying the thermal comfort of the users,the energy-saving renovation of existing university buildings is of great significance.First of all,this paper analyzed the energy-saving measures commonly used in public buildings and found out the energy-saving retrofit measures applicable to severe cold climate zone,including peripheral protective structures and other renewable energy utilization.The present situation of university buildings was investigated.Through the field test of thermal environment and thermal comfort of the two types of buildings(Building A has energy-saving measures for built after 2005,Building B built without energy-saving measures for 2005 years ago),we found that the performance of the old existing university building envelope structure was poor,the indoor temperature was low in winter,the indoor temperature was high in summer,the humidity was also very low,and the energy consumption was too large in winter.Thermal comfort was not satisfactory either.Most subjects felt cold indoors and very hot in summer.The neutral temperature of university buildings was 23.9℃ in winter and 27.58℃ in summer.The comfort temperature ranges from 21.89℃ to 27.85℃.Secondly,taking the indoor comfort temperature as the entry point,Energy Plus software was used to set the indoor heating temperature in winter and the cooling temperature in summer as the measured neutral temperature and energy consumption simulation of common university buildings was conducted.It could be concluded that in the case of different spatial layout,different glass types of exterior windows and roof and exterior walls with different thicknesses and material insulation layers,the energy consumption of the building was different from that of the classroom in the north-south direction and the overall building.It was found that when constructing or renovating university buildings in severe cold zone of Xinjiang,the spatial layout of the buildings could be considered as the first consideration.Windows from the perspective of energy saving to consider the preferred double insulating glass,one of the glass materials was Low-E.A 90 mm thick EPS insulation board was recommended for the roof insulation layer,and a 70 mm thick modified EPS insulation board was recommended for the outer wall insulation layer.Finally,the choice of the energy-saving scheme was analyzed based on a teaching building.Energy Plus software was used to compare the heating energy consumption of the buildings before and after the proposed four schemes,and to compare the energy consumption of the summer natural ventilation mode to the air conditioning cooling mode and the total energy consumption.Calculated the energy-saving rate of the scheme,used the energy-saving rate to measure the transformation effect of the transformation building and determine the transformation scheme.And if the natural ventilation mode was adhered to in summer,the indoor thermal comfort conditions under the retrofit plan were evaluated,including simulated indoor temperature,PMV and PPD hourly changes.In the end,it was found that the retrofit plan could not improve the indoor thermal comfort in summer,so it is recommended to install refrigeration equipment in summer and adopt retrofit plan III or plan IV to achieve energy saving rates of 22.89% and 32.07%.This study provided a reference for the energy-saving reconstruction of education buildings in severe cold zone.