Show all work. Please show the interpolation method. 7-47ER-134a vapor enters into a turbine at 250 psia and175°F. The temperature of R-134a is reduced to 20°F in thisturbine while its specific entropy remains constant. Determinethe change in the enthalpy of R-134a as it passes through theturbine.250 psia175°FR-134a turbine20°FFIGURE P7-47E 7-257-47E R-134a is expanded in a turbine during which the entropy remains constant. The enthalpy difference is to bedetermined.Analysis The initial state is superheated vapor and thush, = 129.94 Btu/lbms, = 0.23279 Btu/lbm - RP = 250 psia(Table A-13E or EES)T = 175°FThe entropy is constant during the process. The final state is also superheated vapor andthe enthalpy at this state isT = 20°Fh, = 106.94 Btu/lbm (Table A-13E or EES)5, = s, = 0.23281 Btu/lbm -RNote that the properties at the inlet and exit states can also be determined from Table A-13E by interpolation but the valueswill not be as accurate as those by EES. The change in the enthalpy across the turbine is thenAh = h, -h, = 106.94 – 129.94 = –23.0 Btu / lbm

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7E R-134a vapor enters into a turbine at 250 psia and PF. The temperature of R-134a is reduced to 20°F in this ine while its specific entropy remains constant. Determine change in the enthalpy of R-134a as it passes through the ine.

7E R-134a vapor enters into a turbine at 250 psia and PF. The temperature of R-134a is reduced to 20°F in this ine while its specific entropy remains constant. Determine change in the enthalpy of R-134a as it passes through the ine.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

Show all work. Please show the interpolation method.

7-47E
R-134a vapor enters into a turbine at 250 psia and
175°F. The temperature of R-134a is reduced to 20°F in this
turbine while its specific entropy remains constant. Determine
the change in the enthalpy of R-134a as it passes through the
turbine.
250 psia
175°F
R-134a turbine
20°F
FIGURE P7-47E

7-25
7-47E R-134a is expanded in a turbine during which the entropy remains constant. The enthalpy difference is to be
determined.
Analysis The initial state is superheated vapor and thus
h, = 129.94 Btu/lbm
s, = 0.23279 Btu/lbm - R
P = 250 psia
(Table A-13E or EES)
T = 175°F
The entropy is constant during the process. The final state is also superheated vapor and
the enthalpy at this state is
T = 20°F
h, = 106.94 Btu/lbm (Table A-13E or EES)
5, = s, = 0.23281 Btu/lbm -R
Note that the properties at the inlet and exit states can also be determined from Table A-13E by interpolation but the values
will not be as accurate as those by EES. The change in the enthalpy across the turbine is then
Ah = h, -h, = 106.94 – 129.94 = –23.0 Btu / lbm

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