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Roof Insulation Example

Roof Insulation Example

Roof Insulation

Example: Roof Insulation in Palm Beach Hotel (2006) Given: Flat roof Area, A = 800 m 2 No insulation For uninsulated roof, U old = 2.5 W/m 2 o C HDD = 600 CDD = 1550 Heat source: boiler Fuel source: diesel fuel @ 0.13YTL/kWh Cooling source: chiller Electricity cost: 0.13YTL/kWh For insulated roof, U new = 0.6 W/m 2 o C Assumption: Boiler combustion efficiency = 80% Chiller COP = 2.5 ECM: Find: Insulation of the bare roof with 50 mm thick polystyrene foam Installed cost = 22,560 YTL Annual savings Simple payback, NPV, SIR, IRR Solution: Old energy losses = (U old x A x HDD x operating time x 1/eff) + (U old x A x CCD x operating time x 1/COP) = (2.5 W/m 2 o C x 800 m 2 x 800 x 24 h/day x 1/0.8)+(2.5x 800m 2 x 1550 x 24 h/day x 1/2.5) = (48000 kWh/yr) diesel fuel + ( 29760 kWh/yr) electricity Old cost = old energy losses x energy cost = 48 000 kWh x 0.13 YTL + 29 760 kWh x 0.13 YTL yr kWh yr kWh = 10108 YTL/yr New energy losses = (U new x A x HDD x operating time x 1/eff) + (U new x A x CCD x operating time x 1/COP) = (0.6 W/m 2 o C x 800 m 2 x 800 x 24 h/day x 1/0.8)+(0.6x 800m 2 x 1550 x 24 h/day x 1/2.5) = ( 11520 kWh/yr) diesel fuel + ( 7 142.4 kWh/yr) electricity

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