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The outdoor air temperature is 6 degrees C while a building maintains the inside temperature at 22 degrees C and loses heat through the walls and roof at a rate of 15 kw.a) Determine the power required to heat the house using electrical resistance elements.b) Determine the minimum theoretical power required by a heat pump.
a rigid tank has a volume of 0.06m3 and initially contains a two-phase liquid-vapour mixture of nbsph2o at a pressure
consider a non-ideal vapor-compression cycle where refrigerant 134a flows at a rate of 0.05 kgs. the refrigerant enters
At the exit, the pressure is 113 kPa and the temperature is 69 degrees C. Determine the mass flow rate, the exit velocity and the area of the exit.
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if a mass of 0.3 kg is suspended from a spring of stiffness 200nm-1. if the mass is displaced by 10mm from its
a projectile is launched from point a with initial speed v0 and makes an angle ?n with the horizontal. it hits the
a tube of diameter 50 mm having a surface temperature of 85degc is embedded in the center plane of a concrete slab
calculate the rate of heat transfer per unit surface area by radiation between two brick walls a short distance a part
a steady-flow compressor is used to compress helium from 15 psia and 70of at the inlet to 200 psia and 600of at the
a manufacturer makes 7900000 memory chips per year. each chip takes 0.4 minutes of direct labor at 8hr. the overhead
two boxes made of the same material have the same masses but their dimensions are different. the bases of the boxes in
a 30 cm 1 beam with flanges and with a web 1.25cm thick is subjected to a torque 4900nm find the maximum shear stress
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