Heat and Mass

1. Window Pane Comparisons
Madison Dudley

2. Project Objective
Compare two different setups by determining the steady state surface temperature on
one side of each setup and the steady state heat flux for each setup.
Setup #1: A double pane window consists of two pieces of glass that enclose an air
space
Setup #2: A window consists of two pieces of glass that enclose an air space with an
additional layer of aluminum foil
- Neglecting radiation, and assuming air enclosed between window panes are
stagnant

3. Materials

4. Methods
1. Directly measure surface temperatures of each setup (inside & outside)
2. Hand calculate convection coefficients
3. Calculate heat flux for each setup
4. Analytically solve for surface temperature of each setup (inside & outside)
5. Numerically solve in COMSOL and compare

5. Data Collection

6. Parameters

7. Calculating
convection
coefficients
Setup 1:
H_inside = 2.88 W/m^2 K
H_outside = 2.52 W/m^2
K

8. Calculating
convection
coefficients
Setup 2:
H_inside = 2.79 W/m^2 K
H_outside = 2.03 W/m^2 K

9. Resistance, Heat Flux,
Analytical Solutions
Setup 1:
R’T = 1.52 m^2K/W
q = -0.18 W
Ts,o = 20.7 deg C → Crappy

10. Resistance, Heat
Flux, Analytical
Solutions
Setup 2:
R’T = 1.46 m^2K/W
q = -0.167 W
Ts,i = 20.76 deg C → Crappy pt 2

11. Setup 1 COMSOL
Ts,i = 20.2 deg C

12. Setup 2 COMSOL
Ts,i = 20.2 deg C
Ts,o = 20.8 deg C

13. Discussion
SETUP 1
SETUP 2
Ts,i (C) Ts,o (C) Heat Trans
(W)
Ts, i (C) Ts, o (C) Heat Trans
(W)
Experimental
Data
28.6 26.1 27.4 30.7
Analytical
Data
20.2 20.7 -0.18 20.76 20.77 -0.167
Numerical
Data
20.2 20.7 20.2 20.8

14. Sources of Error
- Infrared thermometer - usage and distances
- Aluminum foil and glass properties
- Window dimensions
- I’m awful using Comsol

15. Citations
Drapcho, C. 2020. Unpublished Notes, BE 4120, Clemson University.