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A building for which the heat transfer rate through the walls and roof is 1350 Btu/h per degree temperature difference between the inside and outside is to be maintained at 70 degrees F. For a day when the outside temperature is 37 degrees F, determine the power required, in hp, to heat the house using electrical resistance elements and compare with the minimum theoretical power that would be required by a heat pump. Repeat the comparison using typical manfacturer's data for the heat pump coefficient of performance (typical COP range is 2-3).
the thickness of a set of gaskets varies because of random manufacturing disturbances but the thickness values measured
consider two concentric thin wall steel tubes the larger one closed at the bottom and the inner one open. the tubes are
a 9 mm xian short-barreled experimental pistol is fired and the explosive gases push the friction-free bullet out of
r-134a vapor enters an adiabatic turbine at 250 psia and 175 f. the temperature at the outlet is 20 f. determine the
water at 20 degrees celcius flows by gravity through a smooth pipe from one reservoir to a lower one. the elevation
a rigid high-pressure tank has a volume of 3.8ft3 and containss nitrogen at 185 psia and at 290 f. a small leak
an equimolar mixture of n2 and o2 is heated to 2100 k at 1 atm which generates no. calculate the molar values of the
The tank has a 180 mm inside diameter and a 12 mm wall thickness. Knowing that the tank contains compressed air under a pressure of 8 MPa, determine the magnitude T of the applied torque for which the maximum normal stress in the tank is 75 MPa.
you are to design an air compressor with an inlet pressure of 100 kpa an inlet temperature of 300 k and anexit pressure
a completely mixed chemical reactor has an in fluent flow with conc. 150 mgl of a and a flow rate of 100 galmin 380
the motion of a particle is defined by the equation x4t3 - 5t2 5t and y5t2-15t where x and y are expressed in
the motion of the uniform slender rod of length l0.5 m and mass m 3 kg is guided by pins at a and b that slide freely
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