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Unformatted text preview: nd is maintained at a temperature of 20°C at all
times. If the hot water is to meet the heating requirements of
this room for a 24-h period, determine (a) the minimum temperature of the water when it is first brought into the room and
(b) the entropy generated during a 24-h period. Assume constant specific heats for both air and water at room temperature.
7–170 Consider a well-insulated horizontal rigid cylinder
that is divided into two compartments by a piston that is free
to move but does not allow either gas to leak into the other
side. Initially, one side of the piston contains 1 m3 of N2 gas at cen54261_ch07.qxd 11/18/03 9:58 AM Page 348 348
FUNDAMENTALS OF THERMAL-FLUID SCIENCES 500 kPa and 80°C while the other side contains 1 m3 of He gas
at 500 kPa and 25°C. Now thermal equilibrium is established
in the cylinder as a result of heat transfer through the piston.
Using constant specific heats at room temperature, determine
(a) the final equilibrium temperature in the cylinder and (b) the
entropy generation during this process. What would...
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