# Unit Length Heat Loss and Drawing a Thermal Circuit

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Find unit length heat lost and describe the thermal circuit.

Copper pipe inside radius r1 = 1cm

And thickness of pipe = 0.3 cm

So pipe outside radius r2 =1.3cm

Thickness of insulated material = 1cm

Radius of pipe with insulation r3 =2.3cm

Thermal conductivity of insulated material k2 = 0.024 W/mK

Inside pipe temperature T1 = 1000C

Surrounding temperature T2 = 200C

Heat transfer coefficient h2 = 50W/m2K

Radiation coefficient hr = 30W/m2K

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Unit Length Heat Loss and Drawing a Thermal Circuit are calculated from given data.

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Problem 4.2:

1.

Copper pipe inside radius r1 = 1cm

And thickness of pipe = 0.3 cm

So pipe outside radius r2 =1.3cm

Thickness of insulated material = 1cm

Radius of pipe with insulation r3 =2.3cm

Thermal conductivity of insulated material k2 = 0.024 W/mK

Inside pipe temperature T1 = 1000C

Surrounding temperature T2 = 200C

Heat transfer coefficient h2 = 50W/m2K

Radiation coefficient hr = 30W/m2K

Fluxes will be equal for both cases either by ...

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