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U – Factor Calculator

Explore the U-factor (U-value) for windows through a theoretical approach. Calculate heat loss or gain, assess insulation values, and analyze results for different window constructions.

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U – Factor Calculator

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  1. U – Factor Calculator A theoretical Approach Semester Project - Clark Davis

  2. Window System Exterior Interior Forced Convection Natural Convection Conduction Conduction Cellular Convection Semester Project - Clark Davis

  3. U-Factor U-factor (U-value). A measure of the rate of non-solar heat loss or gain through a material or assembly. It is expressed in units of Btu/hr-sq ft-°F (US) or W/sq m-°K (European metric). Values are normally given for NFRC/ASHRAE winter conditions of 0° F (18° C) outdoor temperature, 70° F (21° C) indoor temperature, 15 mph wind, and no solar load. The U-factor may be expressed for the glass alone or the entire window, which includes the effect of the frame and the spacer materials. The lower the U-factor, the greater a window's resistance to heat flow and the better its insulating value.  Semester Project - Clark Davis

  4. U-Factor Calculator Interface Input Window Dimensions & Conditions Solve for U-Factor Input Window Construction Visual of Temperature Gradient Semester Project - Clark Davis

  5. Results Single Pane Double Pane Argon Filled Double Pane Theoretical = 0.188 Theoretical = 0.188* Theoretical = 0.181* Theoretical = 0.367* *For a 1m*1m with 2 mm panes and 10 mm spacing and window at standard test conditions. U factor given in w/m^2. Semester Project - Clark Davis

  6. Conclusion • Results differ significantly from typical values • Modeling may use incorrect assumptions • Advantages of double pane are significant • Approximately 100% increase • Advantage of Argon is minimal • Approximately 5% increase Semester Project - Clark Davis

  7. Sources • Argon Properties • http://www.mhtl.uwaterloo.ca/old/onlinetools/airprop/airprop.html • U-Factor Definitions • http://www.efficientwindows.org/glossary.cfm • Typical Values of U-Factor • http://www.servicemagic.com/article.show.The-U-factor-of-Thermal-Replacement-Windows.8839.html Semester Project - Clark Davis

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