What is the difference between a COP and an HSPF?
What will be an ideal response?
COP is the ratio of heat out divided by heat in and is measured at one condition. HSPF is a measure of heat per watt and is measured for the entire heating season.
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A baker has developed a marvelous cookie recipe that works best if the cookie is cooled in a vacuum chamber through radiation heat transfer alone. The cookie is placed inside the chamber with a surface temperature of 125°C. Assume that the cookie is thin enough so that the temperature is uniform throughout during the cooling process. The walls of the chamber are maintained at 10.0°C. If the surface area of the cookie is 0.005 m2, and if the emissivity of the cookie is 0.80, determine the initial radiation heat transfer rate from the cookie to the walls of the chamber.
Given: Ts = 125°C = 398 K; Tsurr = 10°C = 283 K; A = 0.005 m2; ? = 0.80 What will be an ideal response?
The ____________________ threshold is the point at which the manager must take some kind of action to avoid surpassing the tolerance level
Fill in the blank(s) with correct word
An average of 30 inches per year of precipitation falls over the United States and is equally distributed
in all areas of the country.
Indicate whether the statement is true or false.To complete a four-stroke cycle in one cylinder, the crankshaft must rotate _____ degrees.
A. 180 B. 360 C. 540 D. 720