A device submitted to the Pa- tent Office is shown schemati- cally in the figure to the right. Its inventor claims that it can generate 10 kW of electrical power continuously, using only 0.03 kg/s of low-pressure (2 bar) saturated steam, which exits as a mixture of liquid and gas also at 2 bar. A stream of cooling water (0.3 kg/s, liquid at 1 bar) is used in the device; the patent application lists its entrance and exit temperatures as 20 °C and 40 °C, respectively. The de- vice does not have any other heat or material exchanges with the environ- ment. You are asked to give your fully justified opinion as to whether steady-state operation of this device is (or is not) thermodynamically per- missible. If it is not possible to obtain the electrical power stated, what is the maximum power than can be generated? 0.03 kg/s sat. steam, P = 2 bar 0.3 kg/s liq. water, 8= 20 °C Device liq. + vap. P = 2 bar 8 = 40 °C

A device submitted to the Pa- tent Office is shown schemati- cally in the figure to the right. Its inventor claims that it can generate 10 kW of electrical power continuously, using only 0.03 kg/s of low-pressure (2 bar) saturated steam, which exits as a mixture of liquid and gas also at 2 bar. A stream of cooling water (0.3 kg/s, liquid at 1 bar) is used in the device; the patent application lists its entrance and exit temperatures as 20 °C and 40 °C, respectively. The de- vice does not have any other heat or material exchanges with the environ- ment. You are asked to give your fully justified opinion as to whether steady-state operation of this device is (or is not) thermodynamically per- missible. If it is not possible to obtain the electrical power stated, what is the maximum power than can be generated? 0.03 kg/s sat. steam, P = 2 bar 0.3 kg/s liq. water, 8= 20 °C Device liq. + vap. P = 2 bar 8 = 40 °C

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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Question

A device submitted to the Pa-
tent Office is shown schemati-
cally in the figure to the right.
Its inventor claims that it can
generate 10 kW of electrical
power continuously, using only
0.03 kg/s of low-pressure (2
bar) saturated steam, which
exits as a mixture of liquid and gas also at 2 bar. A stream of cooling water
(0.3 kg/s, liquid at 1 bar) is used in the device; the patent application lists
its entrance and exit temperatures as 20 °C and 40 °C, respectively. The de-
vice does not have any other heat or material exchanges with the environ-
ment. You are asked to give your fully justified opinion as to whether
steady-state operation of this device is (or is not) thermodynamically per-
missible. If it is not possible to obtain the electrical power stated, what is
the maximum power than can be generated?
0.03 kg/s
sat. steam,
P = 2 bar
0.3 kg/s
liq. water,
0 = 20 °C
Device
liq. + vap.
P = 2 bar
8= 40 °C

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