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Chips of width L = 15 mm on a side are mounted to a substrate that is installed in an enclosure whose walls and air are maintained at a temperature of Tsur = 25°C. The chips have an emissivity of s = 0.60 and a maxi- mum allowable temperature of Ts = 85°C. Exposed surface is h = 8 W/m2 · K, and the surface is characterized by an emissivity of ss = 0.9. The solid sili- con powder is at Tsi,i = 298 K, and the solid silicon sheet exits the chamber at Tsi,o = 420 K. Both the surroundings and ambient temperatures are T00 = Tsur = 298 K.
a walk-in cooler using a vapor compression refrigeration cycle is configured as shown below. the cycle uses cfc22 or
a truck travelling along a straight road at speed 20 km/hr increases its speed to 120 hr/hr in time 15 sec.If its acceleration is constant, determine the distance traveled.
one kg of water vapor at 200 kpa fills the 1.1989 m3 left chamber of a partitioned system. the right chamber has twice
Develop an expression for the temperature distribu- tion T(r) in the sphere wall in terms of q2", Ts,1, r1,r2, and the thermal conductivity of the wall material k.
An orifice meter is used to measure the volume flow rate in a pipe. It takes 12 readings (in m3/s): 0.0182, 0.0188, 0.0179, 0.0183, 0.0182, 0.0176, 0.0191, 0.0185, 0.0184, 0.0180, 0.0178, and 0.0186. The true volume flow rate is 0.017920 m3/s. Estima..
an outdoor track is 420 ft in diameter. a runner increases her speed at a constant rate from 14 to 24 fts over a
The thrust, T, of a marine propeller is assumed to depend only on its diameter, D, the fluid density, the viscosity, the revolutions per unit time, and its forward velocity, V. Express this dependence in non-dimensional terms. Is one of the ?–product..
a piston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kpa. heat is
two weights are attached to a wheel pully m1 is 2.00 slugs and m2 is 1.00 slugs use kinetics to calculate the anguler
a work piece 400 mm x 70 mm in diameter is to be machined. the material has constants n0.23and c250 mmin. disposable
A large manufacturing space with an average floor to ceiling height of 30 ft has a floor area of 5000 ft^2. The total infiltration rate for the space is estimated to be 1.5 air changes per hour. The inside design temperature and relative humidity are..
A vapor compression refrigeration cycle using R-134a as the working fluid has an evaporator temperature of -20°F, and a condenser pressure of 140 psia. The refrigerant is saturated at the inlet to the compressor and at the exit of the condenser. The..
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