Thermodynamics HW Solutions 53

Thermodynamics HW Solutions 53 - Chapter 1 Basics of Heat...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 1 Basics of Heat Transfer 1-104E A spherical ball whose surface is maintained at a temperature of 170°F is suspended in the middle of a room at 70°F. The total rate of heat transfer from the ball is to be determined. Assumptions 1 Steady operating conditions exist since the ball surface and the surrounding air and surfaces remain at constant temperatures. 2 The thermal properties of the ball and the convection heat transfer coefficient are constant and uniform. Properties The emissivity of the ball surface is given to be ε = 0.8. Analysis The heat transfer surface area is A s = π D ² = π (2/12 ft)² = 0.08727 ft² Under steady conditions, the rates of convection and radiation heat transfer are
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

Ask a homework question - tutors are online