高热阻墙材孔型设计与热力学性能数值分析

Pass Design of High Thermal Resistance Wall and Numerical Analysis of Thermodynamic Performance

以高热阻烧结墙材孔型设计为目标,分析了材料导热系数、排孔数、横壁与壁肋面积之比、孔型等相关因素对墙材稳态下或非稳态下的热学特性、抗折强度等力学特性的影响.结果包括:(1)得到了厚240 mm高热阻烧结砌块的最优孔型设计;(2)提出了一种稳态下多排孔砌块传热系数(热阻)的数值计算方法并验证了其正确性;(3)在非稳态(周期性非稳态)条件下,随着排孔数增加,多孔空心砌块的内侧瞬态热流和瞬态温度受外侧环境传热影响越小,保温性能越好;当墙材的稳态热阻值设置相同时,多孔空心砌块在非稳态外侧环境下的瞬态热流和瞬态温度值比实心砌块离散度更小,变化更为稳定,保温性能更好.

Aiming at the pass design of high thermal resistance of sintered wall,the effects of material thermal conductivity,the number of holes arranged,the ratio of the transverse wall to wall ribbed area and holes shape on the thermal properties and flexural strength of the wall were investigated.Optimum pass design of 240 thick high thermal resistances sintered block was prepared.In thermal analysis,a numerical calculation method of heat transfer coefficient(thermal resistance)of multi-row holes under steady state was proposed and its correctness was verified,and under unsteady condition,it is concluded that:with the increase of the number of row holes,the inner transient heat flux and transient temperature are less affected by the outer heat transfer,and the thermal insulation performance is better.When the steady state heat resistance of the wall material is the same,the transient heat flux and the transient temperature value of the porous hollow brick are smaller than that of the solid brick in the unsteady external environment,the change is more stable,the insulation performance is better.