基于墙体材料最优保温厚度研究

发布时间：2018-03-13 05:13

本文选题：朝向　切入点：墙体材料　出处：《新型建筑材料》2016年12期 　论文类型：期刊论文

【摘要】：考虑到不同朝向外墙外表面暴露于周期性的太阳照射辐射和室外环境温度,采用MATLAB矩阵函数求解不同朝向瞬态热传导逐时太阳-空气温度。基于不同朝向逐时太阳-空气温度对北京办公建筑4种墙体材料和4个朝向采用XPS进行外墙外保温,计算全年加热和冷却负荷。基于现值系数最大程度减少加热冷却能耗和保温总成本得到最优保温厚度。对采用最优保温厚度,计算20年寿命周期收益和保温投资回收期。结果表明:冬季南向外墙太阳照射辐射得热最多,最优保温厚度最薄。北向外墙最优保温厚度最厚,采用最优保温厚度寿命周期收益最大。同一朝向不同墙体材料最优保温厚度相差明显,4种墙体材料采用最优保温厚度寿命周期收益从高到低依次为:混凝土、灰砂砖、黏土砖、加气混凝土。同一种墙体材料各朝向寿命周期收益相差较大而保温投资回收期相差不大。
[Abstract]:Considering that the external surfaces of external walls are exposed to periodic solar radiation and outdoor ambient temperatures in different directions, The MATLAB matrix function is used to solve the hourly solar-air temperature of transient heat conduction in different directions. Based on the different orientation hourly solar-air temperature, four kinds of wall materials and four orientations of Beijing office building are insulated by XPS. The annual heating and cooling loads are calculated. Based on the present value coefficient, the optimal heat preservation thickness is obtained by reducing the heating and cooling energy consumption and the total heat preservation cost to the maximum extent. The results show that the solar radiation from the south wall is the most radiative in winter, the optimum thermal insulation thickness is the thinnest, and the north wall is the thickest. The life cycle income of adopting the optimal thermal insulation thickness is the greatest. The difference of the optimal insulation thickness between the same wall materials and different wall materials is obvious. The life cycle income of the four kinds of wall materials from high to low are: concrete, lime and sand brick, clay brick, etc. Aerated concrete. The return of each direction life cycle of the same wall material is quite different, but the recovery period of heat preservation investment is not different.
【作者单位】：南京理工大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51308295)
【分类号】：TU551

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