3000 kg of water is heated per hour from 30 to 70 oc by pumping it through a certain heated sect

In this question, the mass flow rate is given as 3000 kg per hour. If we divide it by 3600, we g

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Question

3000 kg of water is heated per hour from 30 to 70 °C by pumping it through a certain heated section of a 25 mm diameter tube. If the surface of the heated section is maintained at 110 °C, estimate the length of the heated section and the rate of heat transfer from the tube to water. The mean bulk temperature of water, tb, is calculated as (30+70)/2 = 50 °C. At the mean film temperature, tf, which is calculated as (110+50)/2 = 80 °C, the thermo-physical properties of water are: ρ = 971.6 kg/m³, μ = 0.355 x 10^-3 kg/m-s, k = 0.667 W/m-°C, and cp = 4195 J/kg-°C.

          3000 kg of water is heated per hour from 30 to 70 °C by pumping it through a certain heated section of a 25 mm diameter tube. If the surface of the heated section is maintained at 110 °C, estimate the length of the heated section and the rate of heat transfer from the tube to water. The mean bulk temperature of water, tb, is calculated as (30+70)/2 = 50 °C. At the mean film temperature, tf, which is calculated as (110+50)/2 = 80 °C, the thermo-physical properties of water are: ρ = 971.6 kg/m³, μ = 0.355 x 10^-3 kg/m-s, k = 0.667 W/m-°C, and cp = 4195 J/kg-°C.

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