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A solar energy system in Gainesville, Florida, requires two rows of collectors facing south and tilted at a fixed 30° angle. Find the minimum normalized distance at which the second row should be placed behind the first row for no shading at noon at winter solstice. What percentage of the second row is shaded on the same day at 9:00 a.m. solar time?
In a tubular low pressure chemical vapor deposition (LPCVD) reactor, gas is introduced at one end at a rate of 75 torr-L/min. At the other end is a vacuum pump of a speed Sp. If the reactor must operate at 1 torr, what value of Sp is required?
air enters an adiabatic compressor at 20 degc and 100 kpa at a rate of 2 kgs and exits at 700 kpa. if the power input
A pressure cylinder (ends closed) having an internal radius of 6 inches and thickness 1 inch is subjected to an internal pressure of 5 ksi, a twisting torque of 50,000 in-lb, and a bending moment of 50,000 in-lb. Determine the principal stresses and ..
a rod has a cross sectional area of 1 cm2. the material has the following strength characteristics beyond which the rod
a reversible power cycle whose thermal efficiency is 40 receives 50 kj by heat transfer from a hot reservoir at 600 k
a spherical shell of steel that is 2 m in diameter and 1 cm thick is supported in water below the free surface at
A rigid vessel contains 10 kg of steam. The steam is initially at 10 bar and 300C. After a period of time the pressure in the vessel is reduced to 1 bar due to heat transfer with the surroundings. The surroundings are at a constant temperature of 20C..
Potassium-42 is a β emitter with a half-life of 12.36 h. Calculate the fraction of this radionuclide remaining in a sample after 1, 10. 20, 30, 40, 50, 60, 70, and 100 h. Plot the fraction remaining versus time. Determine the time required for the..
A furnace wall is to be constructed of brick having standard dimensions 9 by 4.5 by 3 in. Two kinds of material are available. One has a maximum usable temperature of 1900°F and a thermal conductivity of 1 Btu/(h ft°F), and the other has a maximum..
the performance of an ammonia absorption cycle refrigerator is to be compared with that of a similar vapor-compression
an air conditioning system is designed for a zone with a high dehumidification demands and humid outdoor conditions.
gasoline car enginea gasoline car engine has a compression ratio of 8. air enters the cylinders of the engines at 60of.
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