| In today’s world, the energy problem has affected the sustainable development of the society seriously. As a very important aspect, the occupied proportion of building energy consumption is always increasing, only has serious impact on our lives. Based on the combination of building energy efficiency and energy saving of air conditioning, the object of study is a kind of composite wall:interlayer ventilation wall. Interlayer ventilation wall is to increase a layer of interlining in the inside wall of the traditional ventilation, use it to recycling in the indoor exhaust air energy, has been to achieve the effect of energy saving. In this article, mainly from the model optimization, model selection, model characteristics, energy saving efficiency, capital recovery period, the applicability analysis etc were studied.In order to strengthen the interlayer ventilation wall of convective heat transfer, on the basis of previous studies, the model of interlayer ventilation wall has been optimized. In order to achieve energy-saving effect,prevent some delay of latent heat into indoor, we have increased cooling ventilation on the exterior wall.Reference of chengdu area meteorological parameters were simulated, and the relevant performance parameters:For different thickness of this rib pieces of interlayer ventilation wall, when the inlet wind speed between 0.2-0.8 m/s, the winter or summer, the air inlet and outlet air temperature difference is bigger, the heat transfer is more obvious, energy-saving effect is good; For 0.8-2.0 m/s, the energy saving effect is leveling off. Analyzed the thickness of interlayer effect on the outlet temperature,the heat exchange efficiency decline slower with the mouth of the wind speed increases when the thickness of interlayer is small; The opposite counter. Is 30mm interlayer thickness, so the heat exchange efficiency varies with wind speed change range is minimal.Through simulation calculation, drawing out the temperature field distribution within the working condition of each interlayer:thickness of 60 mm sandwich, for example, discussion, interlining inside temperature field distribution is hierarchy,when air inlet wind speed is 0.2～ 0.5 m/s low wind speed, stratification is obvious; Is greater than or equal to 0.8 m/s of the high wind speed, the delamination is not obvious. During the summer, by inside and outside increasing trend; Showed a trend of decreasing from inside to outside in winter.For this new type of interlayer ventilation wall, its thickness ratio is discussed. Interlayer thickness in 30 mm optimal, namely the best thickness ratio is 1/42.In the best condition, the energy-saving efficiency of interlayer ventilation wall, the summer of 0.239,0.353 in winter; Summer electricity saving efficiency is 0.034 KW/KW, winter electricity saving efficiency is 0.051KW/KW.Through to the Chengdu area in 2011 and 2012, two years of meteorological parameter analysis and calculation, there are 110 days in 2011 can realize external wall delayed latent heat recovery, there are 100 days in 2012 to meet conditions. After simulation, through the analysis of interlayer ventilation wall per unit area available night outdoor cold air to achieve 3.98 (KW · h)/(m2, a) the amount of air conditioning energy saving.Into the wind speed 0.5ulation calculation, the total heat transfer coefficient change trend of interlayer ventilation wall, the summer total heat transfer coefficient is stable; Winter change is bigger with the wall thickness is a first-order linear variation, and fitting formula for calculating the total heat transfer coefficient in winter, this formula is available in a certain range.In order to combine with actual and calculated the average energy saving efficiency during summer and winter seasons for 0.043KW/KW. The above research results, for further research and engineering application has certain reference significance. |
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