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 heat-transfer 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 Stefan-Boltzmann constant is 5.670 x 10-8 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