The side walls of a refrigerator are made from two thin layers of sheet metal, each 1/8 in. thick, and with thermal conductivity of k = 42 Btu/h·ft·°F , and a 2-in foam insulation with k = 0.027 Btu/h·ft·°F . If the inside and outside surface temperatures of the refrigerator wall are 35 ºF and 70 ºF, respectively, calculate the heat loss through an area of 8 ft^2.
What will be an ideal response?
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After the fall of the Roman Empire, many countries emerged in the region now called
What will be an ideal response?
How many phase rule variables must be specified to fix the thermodynamic state of each of the following systems?
(a) A sealed flask containing a liquid ethanol-water mixture in equilibrium with its vapor. (b) A sealed flask containing a liquid ethanol-water mixture in equilibrium with its vapor and nitrogen. (c) A sealed flask containing ethanol, toluene, and water as two liquid phases plus vapor.
Undersized suction lines:
A) Can cause poor oil return because of high refrigerant velocity. B) Can reduce system efficiency because of a high pressure drop. C) Can reduce system efficiency because of a low pressure drop. D) Can cause poor oil return because of low refrigerant velocity.
Asian countries have not yet adopted the concept of quality.