1. Clyde Lobby Windows Heat Loss Boyd Black Benjamin Hillyard Kent Fairbourn Winter 2008

2. Project Scope Find heat loss from windows in Clyde Building lobby Find heat loss from windows in Clyde Building lobby Determine financial loss due to heat loss Determine financial loss due to heat loss

3. Window Setup Double paned Double paned Dimensions: 7 ft x 6.01466 ft x 0.01041666 ft Dimensions: 7 ft x 6.01466 ft x 0.01041666 ft Gap thickness: 0.041666 ft Gap thickness: 0.041666 ft Window thickness: 0.061834 ft Window thickness: 0.061834 ft

4. Finding h

5. Problem Schematic

6. Calculated Heat Loss Assumptions: Assumptions: –No convection between panes –Gap width equal to 0.5 inches –Free convection Finding the h values: Finding the h values: –Each Nussel number was calculated to find the h value Determining the heat gain from convection Determining the heat gain from convection –Using a thermal circuit, heat transfer was calculated Determining the heat loss from convection Determining the heat loss from convection –Thermal circuit was used again to find heat transfer

7. Financial Burden Using a value of 0.069 dollars per kWh, total cost was figured to be $615.00 per year Using a value of 0.069 dollars per kWh, total cost was figured to be $615.00 per year National Electricity Rates