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Explain the principle of a critical radius when adding isolation to pipes

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Mechanical Engineering

Explain the principle of a critical radius when adding isolationto pipes

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4.4 Ratings (927 Votes)
We know that by adding more insulation to a wall always decreases heat transfer The thicker the insulation the lower the heat transfer rate This is expected since the heat transfer area A is constant and adding insulation always increases the thermal resistance of the wall without affecting the convection resistance Adding insulation to a cylindrical piece or a spherical shell however is a different matter The additional insulation increases the conduction resistance of the insulation layer but    See Answer
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