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A cooling coil consists of a bank of aluminum (k = 237 W/m · K) finned tubes having the core configuration of figure and an inner diameter of 13.8 mm. The tubes are installed in a plenum whose square cross section is 0.4 m on a side, thereby providing a frontal area of 0.16 m2. Atmospheric air at 1.5 kg/s is in cross flow over the tubes, while saturated refrigerant- 134a at 1 atm passes through the tubes. There are four rows of tubes in the airflow direction. If the air enters at 37°C, what is its exit temperature? A convection coefficient of 5000 W/m2 · K is associated with evaporation in the tubes.
nitrogen initially occupying 3.5 ft3 at 87 psia 480degf undergoes in internally reversible expansion during which pv1.2
The thermal protection system for NASA's Space Shuttle Orbiter was effective due to its exceptional thermal-insulation properties. Calculate the heat flow (per square meter) across a 50-mm-thick ceramic tile with an outer surface temperature of 1200 ..
a stunt driver travels a total distance of 1172 feet moving at a constant speed of 40 miles per hour while weaving
an infinitely long sheet of charge of width l lies in the xy-plane between x - l2 and x l2. the surface charge
an air conditioning system is used to maintain a house at 20 degrees celcius when the outside temperature is 35 degrees
an electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive
a rigid chamber contains 100 kg of water at 500 kpa 100 c. a paddle wheel stirs the water at 1000 rpm with a torque of
ammonia vapor flows through a valve. it enters the valve at a pressure of 8 bar and a temperature of 120c and after
Determine the phase or phases in a system consisting of H2O at the following conditions and sketch P-v and T-v diagrams showing the locations of each state:
a fire hose nozzle has a diameter of 1.375 in. according to some fire codes the nozzle must be capable of delivering at
air flows in a channel whose velocity at 3 neighbouring points ab and c which are 10 cm apart are shown in the
A tire company has determined that its tires have a 1% premature rate of failure on the road. What is the chance that none of the 16 tires shipped to a retailer will have a premature failure?
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