Problems: Convective Heat Transfer: One Dimensional Chemical Engineering Notes | EduRev

Heat Transfer for Engg.

Chemical Engineering : Problems: Convective Heat Transfer: One Dimensional Chemical Engineering Notes | EduRev

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Problems : Module 3 - Convective Heat transfer: One dimensional, Heat Transfer

 

Frequently Asked Questions and Problems for Practice (Module 3)

Q.1What is convection and how is it different than conduction?
Q.2

What is heat transfer coefficient? Explain its physical significance.

Q.3What is film thickness? What is its relevance in the heat transfer operations?
Q.4Out of Ui and Uo, which one is larger in magnitude and why?
Q.5What is the concept of controlling resistance?
Q.6What is critical insulation thickness? Comment on the critical insulation thickness of a plane wall.
Q.7

The temperature profile of a solid sphere is  at steady state condition, the temperature Tis in oC and r is in meter. The thermal conductivity of the sphere is 15 W/m oC. The solid sphere is put in the atmosphere condition at 30 oC. Calculate the rate of heat transfer and evaluate the maximum temperature in the sphere?

Q.8

Steam at 170 oC is flowing in a 10 cm diameter pipe. In order to reduce the heat loss to the environment (at 30 oC) the pipe is planned to be insulated with 10 cm thick insulator. The various data is given under

kinsulatorProblems: Convective Heat Transfer: One Dimensional Chemical Engineering Notes | EduRev (T in oC)
h for outside air (over insulator)6 W/m2 oC
h for outside air (on bare pipe at 160 oC , if no insulator)25 W/m2 oC
Cost of insulationRs. 16000/m3
Steam costRs. 750/ton
Latent heat of steam1820 kJ/kg

Estimate the pay-back period assuming a rate of interest of 0.18/yr.

 

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