Find the polytropic exponent and work
A cylinder/piston contains a saturated vapor R-410a at 10 C; the volume is 10 L. The R-410a is compressed to 2MPa, 60 C in a reversible (internally) polytropic process. Find the polytropic exponent n ans calculate the work and heat transfer.
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A 30-cm-diameter, 5-m-long steam pipe passes through a room where the air temperature is 20 C. If the exposed surface of the pipe is a uniform 40 C, find the rate of heat loss from the pipe to the air if the surface heat-transfer coefficient is 8.
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Refrigerant 134a at 700 kPa and 40oC is expanded adiabatically in a closed system to 60 kPa. Determine the work produced, in kJ/kg, and final enthalpy for an isentropic expansion efficiency of 80 percent.
Determine the instantaneous rate of heat transfer from a 1.5-cm-diameter ball bearing with a surface temperature of 150 C submerged in an oil bath at 75 C if the surface convective heat transfer coefficient is 850 W/m^2 * C.
The R-410a is compressed to 2MPa, 60 C in a reversible (internally) polytropic process. Find the polytropic exponent n ans calculate the work and heat transfer.
Find the critical value. Assume that the test is two-tailed and that n denotes the number of pairs of data. n = 60, = 0.05
Assuming negligible internal resistance, derive a differential equation that could be solved to determine the rod temperature as a function of time during the heating process.
A plane wall, 7.5 cm thick, generates heat internally at the rate of w/m^3. One side of the wall is insulated, and the other side is exposed to an environment at 90 degrees celsius.
A manometer connected to the tap shows a head of 0.14 in. of mercury above atmospheric. Determine the approximate speed of the air leaving the nozzle if it is at 40°F and 14.7 psia.
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