In [2]:

```
# Variables
y = 1.9; # Density in slug/ft**-2
u = 0.0354; # Vismath.cosity in slug/ft-hr
k = 0.376; # Thermal conductivity in Btu/hr-ft-degF
l = 32600.; # Heat of condensation in Btu/slug
Tg = 142.; # Temperature of steam in degF
Tw = 138.; # Temperature of wall in degF
# Calculations
delT = Tg-Tw; # Temperature driving force in degF
g = 418*10**6; # Gravity in ft/sec**2
L = 1./12; # Outside diameter of horizontal tube in ft
C = 0.725; # For horizontal tube
h = C*(g*y**2*l*k**3/(L*u*delT))**0.25; # Heat transfer coefficient in Btu/hr-ft**2-degF
# Results
print "The heat transfer coefficient for steam condensing on a horizontal tube is %d Btu/hr-ft**2-degF"%(h);
# note: rounding off error.
```