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1. A long, circular aluminum rod is attached at one end to a heated wall and transfers heat by convection to a cold fluid.
(a) If the diameter of the rod is tripled, by how much would the rate of heat removal change?
(b) If a copper rod of the same diameter is used in place of the aluminum, by how much would the rate of heat removal change?
2. A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°C. The rod temperature. is in an air environment with Too = 20°C and h = 30
3. Consider an extended surface of rectangular cross sec- tion with heat flow in the longitudinal direction. W/m2 · K. What is the temperature of the rod 25, 50, and 100 mm from the casting?
A cylindrical bar of a metal alloy of 1.5cm in diameter and 38cm in length is loaded in tension which produces an increase in length of 0.19cm. If its yield strength is 240 MPa, its tensile strength is 310 MPa and its elastic modulus is 110 GP, deter..
refrigerant 410a is used for a heat pump. the temperature at the evaporator is -20f. the temperature at the exit of the
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a piston-cylinder device contains a liquid-vapor mixture of water at 300k. during a constant-pressure process 750kj of
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In a reheat-cycle power plant, steam enters the high-pressure turbine at 5 MPa, 450°C, and expands to 0.5 MPa, after which it is reheated to 450°C. The steam is then expanded through the low-pressure turbine to 7.5 kPa. Liquid water leaves the conden..
saturated water vapor in a closed sysytem is condensed by cooling it at constant pressure to a saturated liquid at
Consider a cascade system that uses Carnot refrigeration for the high temperature cycle, and vapor compression refrigeration for the low temperature cycle. Saturated vapor ammonia enters the compressor in the low temperature cycle at 20 psi and exits..
an automobile radiator may be viewed as a cross-flow heat exchanger with both fluids unmixed. water with a flow rate of
Evaluate the mean gas temperature, Tm - what is the rate per unit axial length at which electrical energy must be supplied to each element to maintain its prescribed temperature?
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