Clyde Lobby Windows Clyde Lobby Windows Heat LossHeat Loss

Boyd BlackBoyd Black

Benjamin HillyardBenjamin Hillyard

Kent FairbournKent Fairbourn

Winter 2008

Project ScopeProject Scope

Find heat loss from windows in Clyde Find heat loss from windows in Clyde Building lobbyBuilding lobby

Determine financial loss due to heat Determine financial loss due to heat lossloss

Window SetupWindow Setup Double panedDouble paned

Dimensions: 7 ft x 6.01466 ft x 0.01041666 ftDimensions: 7 ft x 6.01466 ft x 0.01041666 ft

Gap thickness: 0.041666 ftGap thickness: 0.041666 ft

Window thickness: 0.061834 ftWindow thickness: 0.061834 ft

Finding hFinding h

Problem SchematicProblem Schematic

Calculated Heat LossCalculated Heat Loss Assumptions:Assumptions:

– No convection between panesNo convection between panes– Gap width equal to 0.5 inchesGap width equal to 0.5 inches– Free convectionFree convection

Finding the h values:Finding the h values:– Each Nussel number was calculated to find the h Each Nussel number was calculated to find the h

valuevalue Determining the heat gain from convectionDetermining the heat gain from convection

– Using a thermal circuit, heat transfer was Using a thermal circuit, heat transfer was calculatedcalculated

Determining the heat loss from convectionDetermining the heat loss from convection– Thermal circuit was used again to find heat Thermal circuit was used again to find heat

transfertransfer

Financial BurdenFinancial Burden

Using a value of 0.069 dollars per Using a value of 0.069 dollars per kWh, total cost was figured to be kWh, total cost was figured to be $615.00 per year$615.00 per year

National Electricity Rates