Study On Energy Saving Target Of Ultra-Low-Energy Residential In Cold Areas

With the development of economic, industrial and social levels, continued growth of urbanization, leading to the construction area and energy demand of the city have increased. China's building energy consumption accounts for 20% to 22% of total energy consumption, in order to implement the principle of sustainable development, building energy conservation is imperative.Ultra-low-energy building is through the integrated use of energy-saving technologies to make energy consumption levels much lower than conventional building construction, and it is one of the key objectives of the development of energy-saving building. The energy conservation standards of ultra-low-energy building is a necessary means of building energy constraint. In this paper, research on energy consumption of residential that have central heating in the cold northern area, and make the preliminary data support the work for the energy conservation standards of ultra-low-energy building.(1) In this study, survey the energy efficiency standards of ultra-low-energy building in developed countries, compare our energy efficiency standards method. Suitable for our country in Ji'nan, Beijing as the representative of the cold area. Ultra low energy consumption residential building energy saving target value is based on the energy consumption of the reference building energy saving 87.5%, near zero energy consumption building energy saving target value is based on the energy consumption of the reference building energy saving 93%.(2) Through the establishment of a typical building model, the use of DeST-h software simulation. That only through to improve the building envelope insulation performance, the theory can achieve energy-saving 87.5% of the ultra low energy consumption of residential building energy-saving goals value, and to achieve energy-saving 93% of close to zero energy building energy-saving target value, need to increase the effective auxiliary energy. The rationality of the target value of energy saving in ultra low energy consumption is verified theoretically.(3) Through the cross double vacuum tube solar air set system heat efficiency of field tests, tests showed that this solar air thermal efficiency can reach more than 25%, indicating that this solar air heating system can be used as a supplementary energy of the building;(4) By use of the transverse double vacuum tube solar air heat burden of the system set benchmark building model of wind load. By simulating calculation that in maintaining the heat insulation based can achieve energy saving 87.5% and 93% energy saving target value. Through economic comparison, it is concluded that only by increasing the thermal insulation performance of the retaining structure, the economy is poor in 87.5%. The most economic solution is in the external wall thermal insulation material thickness of 170mm, roof insulation material thickness 250mm, using three layers of Low-E film of double insulating glass, increase 52 sets of solar air collector as a supplementary energy, the building energy consumption in the benchmark building energy-saving 87.5%.