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金属反射式保温块是一种非均质的保温材料,它既有空气的导热,自然对流,反射箔的导热和辐射换热,又有外壳端、侧板的金属导热.这是一个复杂的三维传热问题.本文提出了简化模型,从而可按二维问题近似处理.同时介绍了用有限差分法进行数值计算的方法,编制了金属反射式保温块隔热性能的计算机程序.该程序具有一定的通用性,它不仅能迅速、方便地计算现有保温块的隔热性能,而且能计算各种物理、几何参数以及工作条件对隔热性能的影响,从而为合理设计这种新型保温块提供可靠的依据.
Metal reflective thermal insulation block is a heterogeneous thermal insulation material, it has the heat conduction of air, the natural convection, the thermal conductivity of the reflective foil and radiation heat transfer, and the shell end, the side of the metal heat conduction. This is a complex Three-dimensional heat transfer problem.This paper presents a simplified model, which can be approximated by two-dimensional problems.At the same time introduced the finite difference method for numerical calculation method, the preparation of a metal reflective insulation thermal insulation performance of the computer program.This program has It can not only calculate the thermal insulation performance of the existing insulation blocks quickly and conveniently, but also calculate the influence of various physical and geometric parameters and working conditions on the thermal insulation performance so as to design the new insulation block reasonably Provide a reliable basis.