FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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D2
A 300-lb iron casting, initially at 1050°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be
modeled as incompressible with specific heats 0.10 Btu/lb · °R, and 0.45 Btu/lb · °R, respectively.
(a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F.
Ignore heat transfer between the system and its surroundings.
Tf =
i
°F
(b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R.
Ignore heat transfer between the system and its surroundings.
O =
i
Btu/°R
Touthoolk ond Medie
=
15°C. The substance
A piston-cylinder assembly contains water that is initially at p1 = 2.7 bar and T₁
undergoes a process to reach a final state at p2 = 1.2 bar and T₂ 70°C. Determine the change in specific
entropy As in kJ/kg K using an incompressible model and tabulated property data.
=
(a) Incompressible model: As
= Ex: 0.987
kJ/kg. K
(b) Tabulated data: As =
= Ex: 0.666 kJ/kg K
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