An electric resistance heater is embedded in a long cylinder of diameter 30mm. When water with a temperature of 25degree C and velocity of 1 m/s flows crosswise over the cylinder, the power per unit length required to maintain the surface at a uniform temperature of 90degreeC is 28kW/m. When air is also at 25…
The heat flux through a wood slab 50 mm thick, whose inner and outer surface temperatures are 40 and 20 degree C. respectively, has been determined to be 40 W/m2. What is the thermal conductivity of the wood? All sample problems and notes are based on the following textbook: Fundamentals of Heat and Mass Transfer…
What is the thickness required of a masonry wall having thermal conductivity 0.75 W/m K if the heat rate is to be 80% of the heat rate through a composite structural wall having a thermal conductivity of 0.25 W/m K and a thickness of 100 mm? Both walls are subjected to the same surface temperature…
All sample problems and notes are based on the following textbook: Fundamentals of Heat and Mass Transfer Seventh Edition ISBN-13: 9780470501979 ISBN-10: 0470501979 Edition: 7 Author: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt Publication date: 2011 Publisher: Wiley Format: Hardcover 1072 pages