The aim of this paper is to investigate the effect of ceiling insulation with different insulation material on energy saving. The values of the optimum insulation thickness, the payback periods (PP), and the life-cycle savings (LCS) for three different types of insulation materials (expanded polystyrene, glass wool, and rock wool) were calculated. In calculations, life cycle cost analysis (LCCA) was applied. In the analysis, the present-worth factor (PWF) technique was used for evaluating systems and annual interest and inflation rates were taken 8% and 0%, respectively. The best solution was obtained when the expanded polystyrene was used. The optimum insulation thickness, PP, and LCS were computed as 0.0901m, 1.615years, and 9.643 $/msup2/sup, respectively.
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机译：本文的目的是研究使用不同隔热材料的天花板隔热对节能的影响。计算了三种不同类型的绝缘材料（膨胀聚苯乙烯，玻璃棉和岩棉）的最佳绝缘厚度，投资回收期（PP）和生命周期节省（LCS）的值。在计算中，应用了生命周期成本分析（LCCA）。在分析中，使用现值因子（PWF）技术评估系统，年利率和通胀率分别为8％和0％。当使用发泡聚苯乙烯时，可获得最佳解决方案。最佳绝缘厚度PP和LCS分别为0.0901m，1.615年和9.643 $ / m 2 。
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