Heat Loss Through Enclosure Walls Equations and Calculations
Determine required wall thickness of an enclosure for temperature control and insulation requirements.
Known Design Data: Size (thickness) of insulated encluosure walls and inside and external surface temperatures
Find: Thickness of walls (insulation material) required to maintain heat load.
- Perfectly insulated bottom
- Steady -state conditions
- Constant material properties
- One-dimensional conduction through 5 walls of area (A)
Note: The wall intersection or corners will cause local departures from one-dimensional conduction and a larger heat loss.
Data within boxes variables and can be modified.
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ΔT = T2 - T1
q' = k ΔT / L
L = Atotal ΔT / q = Fouriers Equation
Atotal = 2w1h + 2w2 h + 2w1w2
w1 & w2 = Wall height and width
h = depth of enclosure
Reference: Incropera Fundamentals of Heat and Mass Transfer, Frank P. Incropera and David P. DeWitt