This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: ( 2 5 p o i n t s ) 3. An electric resistance heater is embedded in a long cylinder of diameter 100 mm. When water with a temperature of 25 ° C flows over the cylinder, the power per unit length required to maintain the surface at a uniform temperature of 125 ° C is 31.4 kW/m. Calculate the convective heattransfer coefficient for the water flowing over the cylinder. ( 2 5 p o i n t s ) 4. An overhead, uninsulated industrial steam pipe of 1/ π∗ mm diameter is routed through a building whose walls and air are at 27 ° C. Pressurized steam maintains a pipe surface temperature of 127 ° C, and the heat transfer coefficient associated with natural convection is h = 10 W/m 2 . K. The surface emissivity is ε = 1/5.67. What is the rate of heat transfer loss per unit length from the steam line? (25 points) Note: The StefanBoltzmann constant is 5.670 x 108 W/ m 2. K 4 . * π = 3.1416 (35 points)...
View
Full
Document
This note was uploaded on 08/11/2011 for the course PTFE 3210 taught by Professor Dr.carr during the Spring '11 term at Georgia Institute of Technology.
 Spring '11
 Dr.Carr

Click to edit the document details