Equation
1-- Heat Required To Raise The Temperature of A
Material
Where:
Q1 = Heat required to raise temperature
W = Pounds of material
CP = Specific heat of material (Btu/lb-ºF)
 T = Temperature
rise of material
(TFinal - TInitial) ºF
Equation 2--Heat
Required To Vaporize A Material
(To Melt a Substance, Substitute Latent Heat of Fusion ---Hf---for
Latent Heat of Vaporization)
Where:
Q2 = Heat required to vaporize
W = Pounds of material
Hv = Latent heat of vaporization (Btu/lb)
Equation 3--Heat
Losses From Surfaces
Where:
Q3 = Surface heat losses
A = Surface area (ft2)
FSL = Surface loss factors (W/ft2) evaluated
at surface temperature
t = Exposure time (hours)
Equation 4--Heat
Losses By Conduction Through Materials
Where:
Q4 = Conduction heat losses
K = Thermal Conductivity (Btu · in/ft2 · ºF · hour)
A = Heat transfer surface area (ft2)
X = Thickness of material (inches)
T = Temperature difference across material (T2 -
T1)ºF
t = Conduction time (hours) |
