from __future__ import division
import math
# Initialization of Variable
k = 1.7 #W/m.K
T1 = 1400 #K
T2 = 1150 #K
L = 0.15 #m
W = 1.2 #m
H = 0.5 #m
#calculations:
qx2 = k*(T1-T2)/L
#heat flux
qx = H*W*qx2
#Results
print "the rate of heat transfer through a wall is", qx,"W"
from __future__ import division
import math
# Initialization of Variable
Tinf = 25 #degC
h = 15 #W/m2.K
D = 70 #mm
Ts = 200 #degC
e = 0.8
Tsur = 25 #degC
sigma = 5.67E-8 #W/m2.K4
#calculations:
E = e*sigma*(Ts + 273)**4
G = sigma*(Tsur + 273)**4
#heat transfer per Unit length
q1 = h*(math.pi*D/1000)*(Ts - Tinf) + e*(math.pi*D/1000)*sigma*((Ts+273)**4 - (Tsur+273)**4)
#Results
print "Emissive Power, E =", round(E,0),"W/m2"
print "Irradiation, G =", round(G,0),"W/m2"
print "Heat transfer per unit length, q' = ", round(q1,0),"W/m"
from __future__ import division
import math
# Initialization of Variable
k = 1.2 #W/m.K
T2 = 100 #degC
e = 0.8
L = 0.15 #m
Tinf = 25 #degC
Tsur = 25 #degC
h = 20 #W/m2.K
sigma = 5.67E-8 #W/m2.K4
#calculations:
#inner wall temperature
T1 = T2 + 273 + L/k*(h*(T2 - Tinf) + e*sigma*((T2+273)**4 - (Tsur+273)**4))
#Results
print "inner wall temperature is", round(T1,0),"K"
from __future__ import division
import math
# Initialization of Variable
Tsur = 30 #degC
Tinf = 20 #degC
h = 15 #W/m2.K
Glamp = 2000 #W/m2
alamp = 0.8
e = 0.5
sigma = 5.67E-8 #W/m2.K4
#calculations:
#coating Temp
Ts = Tinf + 273 + (alamp*Glamp - e*sigma*((104+273)**4 - (Tsur+273)**4))/h
#Results
print "coating Temperature is", round(Ts,0),"K"