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Improve the calculation accuracy of the optimal insulation thickness in building walls as determined by a dynamic heat transfer model

10$
ARTICLE DOWNLOAD

Improve the calculation accuracy of the optimal insulation thickness in building walls as determined by a dynamic heat transfer model

10$

Hichem Necib & Brahim Necib 

Abstract

To improve the calculation accuracy of optimum insulation thickness of building walls, the effects of the initial conditions and the choice of the representative day used as boundary conditions on results have been studied. In this context, the unsteady heat transfer across the multilayer wall was considered as one-dimensional and the problem was solved numerically by an implicit finite difference method. A computational FORTRAN code has been developed and validated to calculate, under real meteorological data (RMD), the cooling transmission loads and the optimum insulation thickness during the summer period in the Sahara of Algeria. For steady periodic conditions, the influence of the initial conditions on the precision of the numerical result has been studied for two cases of representative days (July 15 and 21). By comparing the results with the case of real conditions (RMD), we find that the choice of July 15 as a typical day gives more accurate results than the choice of July 21. In addition, the difference of cooling transmission loads of 76.2% for July 15 and 76.31% for July 21 is observed, between the use of a repeated and another non-repeated typical day.

Only units of this product remain
Year 2020
Language English
Format PDF
DOI 10.1007/s42107-020-00248-w