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The element of an electrical heating device is a cylinder with a diameter of 12 mm and a length of 20 cm. The electrical energy is dissipated at a rate of 800 W. The air at 20°C moves in a cross flow over the heater with a velocity of 8 m/s. The thermo physical properties of the cylinder are p(density) = 2800 kg/m3 , cp = 920 J/kg.K, and k = 185 W/m.K. Assuming negligible radiation, determine the steady-state surface temperature of the electrical element.
a thin-walled closed-end cylindrical pressure vessel with spherical end caps is internally pressurized to 500 psi. if
Propane is mixed 20% excess air (propane air mixture is initially at 25 C and 2.0 atm) and combusted at atmospheric pressure. It is assumed that the heat transfer between the chamber and the surroundings is negligible. In addition, you may assume tha..
steam having a specific enthalpy of 160 kjkg and pressure of 1 kpa enters as adiabatic pump. upon leaving the pump the
when the motorcyclist is at a he increases his speed along the vertical circular path at the rate of a 0.3 fts2 where
the imperial ore facility was operated by the galactic empire on the planet raxus prime. the refined ore produced
A brass rod is stress-free at room temperature (20 degrees Celsius). It is then heated up but prevented from lengthening at its ends by external forces. At what temperature does the stress in the rod reach 172 MPa? Assume the modulus of elasticity is..
The yearly average solar flux incident on a horizontal surface in the United States is about 180 W/m2. The average total energy demand in the United States is approximately 100 quads (100 × 1018 ) per year. Assuming an average efficiency of PV cells ..
analyze a hydrogen jt cycle with isothermal compression occurring at 300k with an outlet pressure 2 times the
a heat pump with refrigerant 134a is used maintain a house at 25 degc by absorbing heat from a geothermal water source
For a combined turbine-generator efficiency of 83%, determine the net electric output. Disregard the effect of the KE correction factors.
a steel tape is used to measure a distance of 20 m at a 10 0c. assuming that the tapenbspwill measure the true distance
a steam power plant has high and low pressures of 20 mpa and 10 kpa respectively and one open fwh operating at 1 mpa
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