Problem $1$

At a papermill, a lagged steel pipe is used to carry a hot process stream at $76C.$ Estimate the heat flux from the pipe to the warm surrounding environment at $30C.$ The heat transfer coefficients inside and outside the pipe are $98$ and $12\frac{W}{m^2}\frac{?}{K},$ respectively. Neglecting temperature changes in the process stream, what is the total heat loss from a $2m$ length of pipe?

INSULATION, $k_{\text{i}\text{n}\text{s}}=0\mathrm{.}2\frac{W}{m}K$

STEEL PIPE, $k_{\text{s}\text{t}\text{e}\text{e}\text{t}}=65\frac{W}{m}K$

PROCESS STREAM

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