This page calculates the exterior wall temperature (T_{n})
for an isothermal (constant temperature) multilayer cylinder. You must define
the heat load (Q) conducted from the interior to the exterior layers as well as
the temperature of the interior wall (T_{0}) . The temperature on the
exterior cylinder face is calculated. For each layer you must define the layer
thickness (t_{i}) as well as the layer conductivity k_{i}.

The temperature (T_{n}) is calculated as:

Where *T _{0}* is the inner surface temperature,

Positive values of heat (Q) result in T_{0} being
hotter than T_{n}. Negative values of heat (Q) result in T_{0}
being cooler than T_{n}.

**References**

Holman, J.P., *Heat Transfer*, 7th ed.,
McGraw Hill Book Company, New York, 1990, p 30-32.