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CHAPTER 7 of the extraction steam is constant at the value for 1 MPa,
200 C, and decrease the extraction steam pressure from 1 MPa
to 100 kPa. Plot both the ratio of the mass flow rates of the extracted steam and the feedwater heater and the total entropy
change for this process per unit mass of the feedwater as functions of the extraction pressure.
7–162E A 3-ft3 rigid tank initially contains refrigerant-134a
at 120 psia and 100 percent quality. The tank is connected by a
valve to a supply line that carries refrigerant-134a at 160 psia
and 80°F. The valve is now opened, allowing the refrigerant to
enter the tank, and is closed when it is observed that the tank
contains only saturated liquid at 140 psia. Determine (a) the
mass of the refrigerant that entered the tank, (b) the amount of
heat transfer with the surroundings at 120°F, and (c) the entropy generated during this process.
7–163 During a heat transfer process, the entropy change
of incompressible substances, such as liquid water, can be
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This document was uploaded on 11/28/2012.
- Spring '09