牛粪灰(CMA)混凝土复合保温砌块设计及墙体传热分析

Design of CMA concrete composite insulation block and wall heat transfer analysis

牛粪灰(简称CMA)是一种质纯且成分相对稳定的畜禽养殖废弃物生物质灰.为探讨CMA混凝土复合保温砌块热工性能的影响因素,尝试采用单排孔、双排孔、错位双排孔以及保温材料替代横壁的CMA混凝土复合保温砌块,研究了在不同CMA掺量下各保温砌块的热阻值以及组合成墙体后的传热系数.结果表明:随着CMA掺量的增加,砌块的热阻值随之增大,墙体的传热系数随之减小;在相同孔洞率条件下,砌块纵肋宽度越小,热阻越大,墙体传热系数越小;在砌块内外横壁替换岩棉板和挤塑聚苯乙烯塑料板后,其保温性能明显提高,并得到了替换材料厚度与墙体传热系数关系.

Cattle manure ash(CMA)is a pure,non-toxic and harmful component of biomass ash.In order to study the factors affecting the thermal performance of CMA concrete composite insulation block,single row hole,double row hole,dislocation double row hole and insulation material were used to replace the transverse wall of CMA concrete composite insulation block.The thermal resistance value of each insulation block and the heat transfer coefficient after the composite wall were studied under different CMA content.The results show that with the increase of CMA content,the thermal resistance of the block increases,and the heat transfer coefficient of the wall decreases.Under the same cavity ratio,the smaller the width of the longitudinal rib,the greater the thermal resistance and the smaller the heat transfer coefficient of the wall.After replacing the rock wool board and extradited polystyrene plastic board on the inside and outside transverse walls of the block,the thermal insulation performance is improved obviously,and the relationship between the thickness of the replacement material and the heat transfer coefficient of the wall is obtained.