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1. Consider the transmission case of Problem 1.23, but now allow for radiation exchange with the ground/ chassis, which may be approximated as large surround- ings at Tsur = 30°C. If the emissivity of the case is s = 0.80, what is the surface temperature?
2. One method for growing thin silicon sheets for photo- voltaic solar panels is to pass two thin strings of high melting temperature material upward through a bath of molten silicon. The silicon solidifies on the strings near the surface of the molten pool, and the solid silicon sheet is pulled slowly upward out of the pool. The silicon is replenished by supplying the molten pool with solid sili- con powder. Consider a silicon sheet that is Wsi = 85 mm
(a) Determine the electric power, Pelec, needed to oper- ate the system at steady state.
(b) If the photovoltaic panel absorbs a time-averaged solar flux of q"sol = 180 W/m2 and the panel has a conversion efficiency (the ratio of solar power absorbed to electric power produced) of 77 = 0.20, how long must the solar panel be operated to pro- duce enough electric energy to offset the electric energy that was consumed in its manufacture?
the average january temperature for rome italy is 44.2 degf and the average july temperature is 74.8 degf. how much
hot water at 60 c enters a thin copper tube with an inside dia of 6mm and a length of 20m. the copper tube is exposed
A system undergoing a power cycle requires an energy input by heat transfer of 104 Btu for each kW-h of net work developed. Determine the thermal efficiency.
a mixture of nitrogen and carbon dioxide with a carbon dioxide mass fraction of 50 percent has a constant-volume
fluid mechanics problem a triangular shaped cylinder is enclosed in a container of oil and rotates at an angular
Determine the periodic time of the motion, the maximum velocity and acceleration and (c) the velocity and acceleration when the body is 300 mm from its amplitude.
a refrigeration system has a coefficient of performance of 5. the heat rejection is an isothermal process at 37c. what
saturated water vapor is enclosed in a piston cylinder arrangement with a volume v initial 5 liters at a temperature
a rocket has a nozzle which is expanded from a chamber pressure of 10 mpa to a pressure that is 23 of sea level
estimate the density of an aluminum-magnesium alloy used for soda cans as a weighted average of the densities of
It has been suggested that an independent certification authority should be established. Vendors would submit their components to this authority, which would validate that the component was trustworthy.
consider the flow of air over a vertical flat plate at a low velocity u1 in ambient pressure p1. the plate surface
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