Consider a large 3-cm-thick stainless steel plate in which heat is generated uniformly at a rate of 5 × 10 6 W/m 3 . and Assuming the plate is losing heat from both sides, determine the heat flux on the surface of the plate during steady operation.
Consider a large 3-cm-thick stainless steel plate in which heat is generated uniformly at a rate of 5 × 10 6 W/m 3 . and Assuming the plate is losing heat from both sides, determine the heat flux on the surface of the plate during steady operation.
Consider a large 3-cm-thick stainless steel plate in which heat is generated uniformly at a rate of
5
×
10
6
W/m
3
.
and Assuming the plate is losing heat from both sides, determine the heat flux on the surface of the plate during steady operation.
A 300-ft-long section of a steam pipe whose outer diameter is 4 in passes through an open space at 50°F. The average temperature of the outer surface of the pipe is measured to be 280°F, and the average heat transfer coefficient on that surface is determined to be 6 Btu/h·ft2·°F. Determine (a) the rate of heat loss from the steam pipe and (b) the annual cost of this energy loss if steam is generated in a natural gas furnace having an efficiency of 86 percent, and the price of natural gas is $1.10/therm (1 therm = 100,000 Btu).
A hollow spherical iron container with outer diameter 20 cm and thickness 0.2 cm is filled with iced water at 0°C. If the outer surface temperature is 5°C, determine the approximate rate of heat loss from the sphere, in kW, and the rate at which ice melts in the container. The heat of fusion of water is 333.7 kJ/kg.
A cylindrical fuel rod (k = 30 W/m•K) of 2 cm in diameter is encased in a concentric tube and cooled by water. The fuel rod generates heat uniformly at a rate of 100 MW/m3, and the average temperature of the cooling water is 115°C with a convection heat transfer coefficient of 2500 W/m2.k. The operating pressure of the cooling water is such that the surface temperature of the fuel rod must be kept below 200°C to avoid the cooling water from reaching the critical heat flux (CHF). The critical heat flux is a thermal limit at which a boiling crisis can occur Determine the temperature at the surface of the rod. What can you do to lower the temperature aty the surface?
Chapter 2 Solutions
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The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY