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A building for which the heat transfer rate through the walls and roof is 1400 Btu/h per degree temperature difference between the inside and outside is to be maintained at 68oF. For a day when the outside temperature is 38oF, determine the power required at steady state, in hp, to heat the building using electrical resistance elements and compare with the minimum theoretical power that would be required by a heat pump.
a 10.00-meter-long pipe closed at one end was inverted and submerged vertically in a minnesota lake until the closed
xerted on the shaft shown in the figure, which rotates at 1150 rev/min and supports a 10-kip bending force. Use a 1095 HR steel. Specify a diameter d using a design factor of nd = 1.6 for a life of 3 min. The surfaces are machined.
a frictionless piston -cylinder device contains saturated liquid water at 200 kpa pressure. now 450 kj of heat is
what is the specific volume, internal energy (kj/kg) and enthalpy (kj/kg) for water at 1.8 mpa and 120 Degrees C? Locate the state on p-v diagram and document assumptions.
an air conditioner can produce a 120 kjmin cooling effect while rejecting 2.5kw of heat. what is its cop and the
the minto wheel is a power-producing device activated by evaporating and condensing a working substance. the only
a cylinderpiston arrangement contains water at 105 c 85quality with a volume of 1l. the system is heated causing the
1045 steel is carburized at 650 degree c for 500 hr. the carbon concentration is 0.6 wt at a position of 3.7 mm beneath
a rigid 2-ft3 vessel contains water originally at 150of and 5.07 percent quality. the water is then heated until its
a steel disc 300 mm diameter of mass 29kg is suspended from the end of a wire 2.5 mm diameter and 1.5 m long which is
a cube is originally at 100 degree. from t 0 on the faces are held at 0 degree. find the time-dependent temperature
twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 f. the gas mixture
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