Study On Energy-saving Characteristics Of An Ultra-low Energy Residential Building In Qinghai Province

At present,with Chinese economic development speed is accelerating,urban energy consumption is also increasing.According to relevant data,the proportion of building energy consumption in the total energy consumption rose from 10%in the late1970s to 27.45%,and gradually approached 30%.Therefore,our country must implement more efficient,green,environmental protection energy conservation measures.In Qinghai province,solar energy resources are very rich,and solar energy,as a kind of renewable energy,is widely used.Many architectural designers combine solar energy with low-energy buildings to realize the combination of renewable energy buildings.Based on the solar fresh air system,in this paper,the energy-saving characteristics of an ultra-low-energy building in qinghai province were studied.Starting from the energy-saving characteristics under design parameters,the paper analyzed and calculated the impact of new air volume and building air tightness on building energy consumption by using De ST simulation software.The main work:First,by De ST simulation from the cold area low energy consumption residential building and common building fresh air system heat load and cooling load characteristics,by changing the size of the new air volume model parameters corresponding to different cold and hot load of the fresh air volume,the new wind load of low energy consumption building features and reached the conclusion that in the cold and cold area,within a certain range,the new air volume change,building cold,heat load index will inevitably change,the basic linear relationship,and relative to the cooling load,the change of the heat load is bigger.So in the heating time longer than the normal heating time of the cold and cold areas should take the minimum amount of new air required by residential buildings.Secondly,the air tightness was tested on the spot.In the test process,the air tightness method was used to carry out the experimental test.The average value of the overall air tightness of the building was calculated to be 0.4 times/h,which was lower than the 0.6 times/h required in the technical guidelines for passive ultra-low-energy green buildings?trial?.Through the simulation of the test results,it is found that the building energy consumption increases with the increase of the overall air change times.Then,in view of"lishui city bay,xin"low energy consumption building demonstration of heating system in detail,and according to the actual system operating condition to determine the test object room,for each measuring object room for indoor thermal environment and air quality related parameters of the test scheme design,according to requirement of the related specification and the arrangement of measuring points,then the related parameters of the heating system arrangement of measuring points in the test method and illustrated.The indoor environment was tested by temperature and humidity meter and air quality detector,and it was found that the temperature of most rooms met the requirements of the design parameters.In the absence of heating measures,the relative humidity of each room is significantly higher than that of the heating room,and the relative humidity of each heating room is lower than 40%,indicating poor comfort.The actual heat transfer coefficient of each envelope is lower than the designed heat transfer coefficient,and the thermal insulation performance of passive buildings is good.The infrared thermal imager shows that the building has no obvious serious thermal defects and has good thermal performance.Finally,using the De ST software to carry on the actual building energy consumption calculation,and with the prophase work of simulation calculating thermal index comparison,found the actual construction of the final energy saving effect is much higher than the passive ultra-low power green building technical guideline?try out?"the relevant requirements,compared with the benchmark buildings,only by improving the palisade structure heat preservation performance and air tightness can be energy-saving 90.13%.According to the calculation of the solar heating system based on the relevant test data of the solar fresh air heating system,the daily energy saving standard coal amount of the solar hot water collector is 21.432 kgce,the CO₂ emission reduction amount is 52.937kg,and the daily cost saving is 65.794 yuan during the operation of the system.