Optimization of thickness of thermal insulation for roofs of turkey’s houses

R. Georgiev, V. Dimova, K. Peichev, Р. Georgiev
Abstract. The thermal insulation of roofs of laying turkey hen houses is discussed. The mean monthly temperatures for the respective region were used to determine monthly heat losses through a roof of various thermal insulation thicknesses (40, 60, 80, 100, 120 and 140 mm). The annual heat losses through the roof were calculated as the sum of the monthly heat losses. Then, these losses were used to determine the amount of fuel, and the equivalent cost in Euro to cover such energy losses. Depreciation expenses were determined on the basis of the cost of the thermal insulation (panels) per 1 m2 over an operational lifetime of 25 years. The sum of the annual energy costs to cover the thermal losses through the roof and the depreciation expenses was used to determine the annual discounted costs of the thermal insulation. The resulting dependence of the discounted costs on the thermal insulation thickness makes it possible to determine the thickness at which the discounted costs are the lowest, i.e. the optimal cost-effective thickness. When using wood pellets and black coal as heating fuel for laying turkey hen houses, the economically feasible thickness of thermal panels is 10–14 cm.