Heat transfer through curvilinear partitions differs, in mathematical terms, from transfer
through flat ones. However, in practical calculations, an approximation is commonly used
by estimating heat loss by analogy to flat partitions. There are no studies in the literature
related to an exact quantitative analysis of heat loss through curvilinear partitions. The aim
of the article is a comparative analysis of the computational heat loss determined for layered
cylindrical and spherical partitions determined by the exact and the approximate methods.
The percentage discrepancy of results was determined. Relevant computational examples
were analysed. It was found that in most cases the above approximation does not lead to
significant inaccuracies if the basis for calculating the heat transferring surface area is the
mean radius of curvature of the partition.
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