A new approach to calculate the energy saving per unit area and emission per person in exterior wall of building using diffrent insulation materials and air gap [Bina diş duvarlarinda farkli yalitim malzemesi ve hava boşluǧu kullaniminin,birim alandaki enerji tasarrufu ve kişi başi emisyon hesaplamalarinda yeni bir yaklaşim]

Optimal insulation thickness (oit),total cost,energy savingsandpayback period (pp) has been calculated by using air gap together with insulation materials in buildings located in ankara. the analysis of the exhaust emission rate has been carried out by calculating the total outer wall surface area of buildings and populations in the province. in these analysis,natural gas and coal as fuel,extruded polystyrene foam (xps),mineral wool and expanded polystyrene (eps) as insulation material were used with four different thicknesses of air gap combinations at exterior walls of building (sandwich walls). whennatural gas is used as fuel and 4 cm air gap is introduced to xps as insulating material,optimal insulation thickness (oit) reduces to 3.4 cm from 9.2 cm,payback period (pp) decrease from 1.509 to 1.320 years. this results in by 28% reduction in the total cost,while annual savings were significantly increased to 96% in m2. when coal is used as fuel with the same insulation material parameters applied above,(oit) reduces to 5.00 cm from 10.8 cm,payback period (pp) decrease from 1.426 to 1.292 years,which results in by 24% reduction in the total cost with an increase to 94% in m2 for annual savings. according to our calculations based on total population and residential subscribers to electricity in 2014,co2emissionrate for natural gas usage are found to be reduced by 82% when 4 cm insulating material with 4 cm air gap is used compared to building without insulation. when coal is used for heating,co2 and so2 emissions rates are calculated to be reduced by 82%.