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A heat pump maintains a temperature of 25°C inside a house. The house leaks 0.8 kW per degree temperature difference between the inside and outside of the house. Assuming that this is a real heat pump having a coefficient of performance equal to only 70% that of a Carnot heat pump, and assuming that the heat pump requires 1.5 kW of power, what is the minimum temperature outside that can exist to allow the heat pump to work?
over a certain temperature interval the saturation pressure-temperature curve of a substance is represented by an
a compressor raises the pressure of 3kg of air gamma 1.4 adiabatically from 100kpa 288k to 450kpa. the electric motor
Show that Airy's stress function ? = Crθ sinθ satisfies the biharmonic equation. Also determine the stresses in polar co-ordinate system.
from fundamentals of engineering thermodynamics book 9.85 for the turbojet in problem 9.84 plot the velocity at the
liquid water is cooled at a constant pressure of 200 kpa in a piston-cylinder device from a temperature of 110 degc to
The external heat transfer coefficient is h=10 W/m^2*K. What is the rate of heat loss to the ambient?
a new alloy used for construction of artificial hops is co20cr10mo. calculate the mpole fractions and mass fractions of
A cylindrical bar of aluminum 19 mm (0.75 in) in diameter is to be deformed elastically by application of a force along the bar axis. Using E=10 psi (Modulus of Elasticity), determine the force that will produce an elastic reduction of 1e-4 in. in..
position the links for the small aircraft nosewheel actuation mechanism. then reposition the links as the 12-in is
the girl at C stands pulls the rope horizontally at a constant speed of 6 ft/s. determine how fast the boat approcahes the pier at the instant the rope lenght AB is 50 ft.
a pistoncylinder arrangement is filled with helium gas. the gas is compressed with a polytropic process with nk. the
the 244000-lb space-shuttle orbiter touches down at about 230 mihr. at 193 mihr its drag parachute deploys. at 35 mihr
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