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Overall heat transfer co-efficient A pipe carrying milk at 4 °C without insulation will gain heat...

Overall heat transfer co-efficient

A pipe carrying milk at 4 °C without insulation will gain heat from outside environment (with air temperature of 20 °C) before it reaches the cold storage containers from heat exchanger. If the pipe carrying the milk has thermal conductivity of 40 W/(m °C) with inside diameter of 5 cm and outside diameter of 7.5 cm, what is the maximum length of the pipe to limit rate of heat transfer to 1kW. Consider the convective heat transfer co-efficient for outside air and inside milk are: 30 W/(m2 °C) and 5 W/( m2 °C).

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