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1. A heat pump with COP = 4 uses 1 kW of power input to heat a 25?C room, drawing energy from the outside at 15?C. Assume the high/low temperatures in the heat pump are 45?C/0?C. Find the total rates of entropy into and out of the heat pump, the rate from the outside at 15?C, and the rate to the room at 25?C.
2. A window receives 500 W of heat transfer at the inside surface of 20?C and transmits the 500 W from its outside surface at 2?C, continuing to ambient air at -5?C. Find the flux of entropy at all three surfaces and the window's rate of entropy generation.
Would you recommend a simple refrigeration cycle with refrigerant-134a or a two-stage cascade refrigeration cycle with a different refrigerant at the bottoming cycle? Why?
Given that the average power plant produces 667 MW of electricity per year, there are 492 coal plants in the US, and a solar constant of 1.361 KW/m^2, how large of an area would one need to cover with solar cells
A chair weighing 150 rests on a level floor that is not frictionless. A man pushes on the chair with a force = 43.0 that is directed at an angle of 34.0 with the horizontal. Assume that the chair is stationary but is on the verge of sliding.
Argon in a light bulb is at 110kPa, 70 degrees celsius. The light is turned off, so the argon cools to the ambient 20 degrees celsius. Disregard the glass and any other mass and find the specific entropy generation.
Why is granular activated carbon(GAC) used to treat the industrial wastewater stream but not the domestic wastewater stream
A piston-cylinder assembly containing 1/4 kg of a gas undergoes a constant pressure process at 5 bar beginning with a specific volume of 20 m^3/kg. for the gas in the system the work is -15 kj. determine the final volume of the gas in m^3
A pneumatic-tired tractor with a 354 - hp engine has a maximum speed of 3.6 mph in 1st gear. Determine the max. rimpull of the tractor in each gear if the engine effieicency is 91%. (1st gear = 3.8 mph, 2nd gear = 6.5 mph, 3rd Gear = 11.5 mph, 4th Ge..
One method of removing phosphate from wastewater effluents is to precipitate it with aluminum sulfate. A plausible stoichiometry (but not exact because aluminum and phosphate can form many different chemical materials) is
An old wooden telephone pole with a single cross member was blown off center during a recent storm. To temporarily stabilize the telephone pole, a repair crew has attached a cable from the end of the cross member to an eye-ring stake anchored in t..
Determine the support reactions at A, C, and E on the compound beam which is pin connected at B and D.
A rectangular beam with a width of a 8 in. an effective depth of 10 in., and a total depth of 12 in., is reinforced with a single fiberglass reinforcing bar that has a cross sectional area of 0.45 in^2
Five million gallons per day (mgd) of a conservative substance,with concentration of 10 mg/L is released into a stream having anupstream flow of 10.0 mgd and a substance concentration of 3 mg/L.Assume complete mixing.
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