Determination of optimum insulation thickness for building walls by using heating and cooling degree-day values of all Turkey's provincial centers

In this study, the optimum insulation thicknesses required in Turkey's 81 provincial centers are determined. The calculations are made on the basis of four different fuels (natural gas, coal, fuel oil and liquefied petroleum gas) and 5 different insulation materials (extruded polystyrene, expanded polystyrene, glass wool, rock wool and polyurethane). Three different cases have been considered: buildings heated but not cooled, cooled but not heated, and both heated and cooled; optimum required insulation thicknesses in accordance with each case are calculated. Optimum insulation thicknesses, total net saving amount, reimbursement period change according to the fuels and insulation materials are calculated on the basis of 5 different provincial centers (Ä°zmir, Ä°stanbul, Ankara, Sivas and Erzurum) selected according to their degree/day values.