Building Energy Saving Based On Energy Exchange Between Exhaust Of Air Conditioning And Envenlope

The objective of this subject is based on the purpose and requirement of building energy saving. On the bases of the building materials and construction, by combining the building facilities, using the most reasonable methods and modes of building energy saving, achieve the compound building energy saving aims.An innovation envelope– interlayer ventilation wall has been put forwarded combining the wall and air exhaust recycling of air conditioning equipments to optimized building energy saving integrally. While the recycling air exhaust, energy can be recovered, the thermal characteristics of interlayer ventilation wall can be improved, the radiation can also be reduced between the body and internal wall surface, increasing the thermal comfort of human being inside the building, and the purpose of energy saving and environmental protection can be achieved.(1)The air current temperature field and velocity field of the interlayer ventilation wall have been analog calculated and analyzed by finite element method. After reviewing the optimum parameters design, the optimum design thickness and height ratio of the air interlayer is 1/55. The optimum inlet air velocity of the interlayer ventilation wall is from 0.6m/s to 1.0m/s, and how the inlet air velocity effects energy saving. The influence is little for interlayer ventilation when the height of inlet less than 200mm, the influence is obvious when the height is from 250mm to 500mm, and the position should be placed reasonably.(2)The air exhaust energy recovery of interlayer ventilation wall and energy saving of building air conditioning loads have been researched by setting up the experimental analog buildings. The numerical simulation results have met the reality certificated by experimental research. The result about the energy saving of air conditioning system is 0.05KW/KW refrigerating (heating) output.(3)Using the simulating software DeST to calculate the air conditioning cool and heat loads of office buildings with different heat transmission coefficient envelope in six cities of China. The results show that the lower the heat transmission coefficient of building envelope, the lower the air conditioning loads, the better energy saving of building in winter. Inverse, the lower the heat transmission coefficient of building envelope, the higher the air conditioning loads, the worse energy saving of building in summer. The air conditioning loads varied with different proportion when the indoor set temperature was higher or lower 1℃. So there exists an optimized temperature setting for satisfaction human. The influence of the outdoor meteorological parameter was greater than the envelope heat transmission coefficient to building fractional energy saving.(4)The engineering application of interlayer ventilation wall has been discussed. Technical and economical analysis of interlayer ventilation wall has been done. Based on the buildings in Shanghai area and a standard air conditioning system, a 4 years payback period for interlayer ventilation wall implementation was needed. The relevance conditions of interlayer ventilation wall are big envelope, big fresh air and big air conditioning loads buildings. The air conditioning cooling and heating loads of office buildings with different heat transmission coefficient envelope in six cities of China have been calculated. How envelope heat transmission coefficient influenced air conditioning loads has been discussed.The building energy saving theory and application has been researched based on the energy exchange between air exhaust and envelope according to Shanghai's climate and local features. The methods and conclusions may be useful to building energy efficiency theories, research and design.