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A dwelling for which the heat transfer rate through the walls is 1400 Btu/h per degree temperature difference between the inside and outside is to be maintained at 68F. For a day when the outside temperature is 28F, determine the power required, in kW, 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 considering an actual heat pump with a coefficient of performance of 3.
a tank of 0.05 m3 volume air at 800 kpa absolute and 15 c. at t0 air begins escaping from the tank through a valve with
question 1the naca 4412 airfoil has a mean camber line given byby using thin airfoil theory calculatea. its zero-lift
Drinking water at 10oC for an office complex must be pumped along a horizontal section of PVC pipe 50 m long at 2 m/s. The pipe has a nominal diameter of 62.5 mm and is Schedule 40. What is the head loss in m?
a transistor in a stereoamplifier dissipates 0.4 w within a housing that is cylindrical radius 8 mm and height 8 mm.
two kilograms of water execute a carnot power cycle. during the isothermal expansion the water is heated until it is a
assume that blood is flowing through an aorta of 1cm diameter at an average velocity v of 50 cmsec. take alpha to be 12
a timber company wishes to increases sales of timber by supplying log cabin kits that can be assemed and used as
carbon dioxide enters an adiabatic compressor at 100 kpa and 300 k actual inlet conditions at a rate of 0.5 kgs and
a swimming pool is drained using a hose. the hose has 20 mm internal diameter a roughness height of 0.2 mm and is 30 m
determine the resultant internal normal force acting on the cross section through point of the signpost. the post is
a structural member supports loads which produce at a particular point a direct tensile stress of 80 nmm2 and a shear
you are asked to design a heating system for a swimming pool that is 2 m deep 25 m long and 25 m wide. your client
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