Reconsider Prob. 9–28E. Using EES (or other) software, plot the rate of natural convection heat transfer for different orientations of the plate as a function of the plate temperature as the temperature varies from 80°F to 180°F, and discuss the results.

Data from problem 28

Consider a 2-ft 3 2-ft thin square plate in a room at 75°F. One side of the plate is maintained at a temperature of 130°F, while the other side is insulated. Determine the rate of heat transfer from the plate by natural convection if the plate is

(a) Vertical,

(b) Horizontal with hot surface facing up,

(c) Horizontal with hot surface facing down.