what is the temperature loss per foot of 3/8″ stainless steel tubing

Engineers or designers who need to transport hot fluids through pipes over long distances need to take into account the natural heat losses that will occur along the way. These thermodynamic calculations can be quite complicated, unless certain assumptions are made, a stable condition and the lack of convection tubes in other areas. Fortunately, these assumptions are valid for most practical applications and will allow accurate results.

Heat loss from steel pipes at various temperature difference between pipes and ambient air:

1 kW (kJ/s) = 102.0 kpm/s = 859.9 kcal/h = 3,413 Btu/h = 1.360 hk = 1.341 hp = 738 ft lb/s = 1,000 J/s = 3.6x106 J/h
1 m (metre) = 3.2808 ft = 39.37 in = 1.0936 yd = 6.214x10-4 mile
Nominal Pipe Size: 3/8"
Inside Diameter: 0.0125 m (0.49 inches)
How to calculate heat loss per foot
How to calculate pipeline losses

1 The determined thermal conductivity, also known as the heat transfer coefficient, calculates the heat loss for your pipe material. Linked to the table, values ​​for the most common pipe materials can be found in the resource.
2 Record the expected temperature of the fluid being transported through the pipe and the temperature of the air outside the pipe.
3 You can use the following formula and simply replace the appropriate value in:
 
Q = 2 * (pi) * k * L (T1-T2) / [ln (r2 / r1)]
 
At: k = tube material, heat transfer coefficient
 
T1 = internal temperature of the pipe, which can be assumed to be the same temperature of the fluid,

T2 = the pipe, which can be assumed to be the same as the temperature of the air outside the pipe, and the temperature outside
 
L = the length of the pipe fluid will be transported,
 
r1 = tube inner diameter
 
r2 = outside the pipe, radius
ln = natural logarithm
 
pi = 3.14159,

And the final value will generate heat loss in the pipeline. Use consistent units in your calculations. Proper calculations will produce results expressed in heat loss per watt per linear distance.