## Optimum Insulation Thickness of External Walls for Energy Saving

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2017
##### Authors
Dababt, Aman
Most of energy is used up to space heating in the cold regions and cooling in the hot regions in Palestine . Insulation in external walls of buildings has been gaining much more interest in recent years not only for the environmental eﬀect of the consumed energy but also the high cost of the energy. Therefore, the optimum insulation thickness was investigated in this study for Nablus andTulkarm city. The optimization is based on the life cycle cost analysis. As a result considerable energy saving is obtained when the optimum insulation thickness is applied. And it was show for the two main types of insulations which is Styrofoam (Expanded polystyrene) type and Astrofoil type. For Styrofoam type in Nablus city for winter and summer it was shown that the optimum insulation thickness that should be used is 15 cm in winter and 9cm in summer, and the annual saving equal 14 $/m2/yr in winter and 5.32$/m2/yr in summer .Also the saving of co2 emission equal 0.0324 kg/m2yr in winter by using LBG and 24.856 kg/m2yr in summer by using electricity . For Styrofoam type in Tulkarmcity for winter and summer it was shown that the optimum insulation thickness that should be used is 8cm in winter and 12cm in summer, and the annual saving equal 4.23$/m2/yr in winter and 7.4$/m2/yr in summer. Also the saving of co2 emission equal 0.0098kg/m2yr in winter by using LBG and 34.893kg/m2yrin summer by using electricity. For Astrofoil type in Nablus city for winter and summer it was shown that the optimum insulation thickness that should be used is 54mm in winter and 32mm in summer, and the annual saving equal 12.2$/m2/yr in winter and 4.3$/m2/yr in summer. Also the saving of co2 emission equal0.028kg/m2yr in winter by using LBG and 20.017kg/m2yr in summer by using electricity. For Astrofoil type in Tulkarm city for winter and summer it was shown that the optimum insulation thickness that should be used is 28mm in winter and 38mm in summer, and the annual saving equal 3.3$/m2/yr in winter and 6.12$/m2/yr in summer. Also the saving of co2 emission equal 0.0077kg/m2yr in winter by using LBG and 28.58kg/m2yr in summer by using electricity. Degree day for Nablus equal 1512 in summer and 1584 in winter, for Tulkarm equal 2060.576 in summer and 509.376 in winter. Also we studied the effect of the change orientation of wall by HAPprogram . As a result for heating in Nablus the highest saving equal 16.4 $/season when the wall oriented in the North . And for cooling in Tulkarm the highest saving equal 3.3$/season when the wall oriented in the East