ry saturated steam

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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A steam engine develops 45 BHP with dry saturated steam at 1.03425 MPa and exhaust at
0.12411 MPa. Steam consumption is 750 kg/hr. Calculate the thermal efficiency of
equivalent Rankine Engine, in percent.

Use:

@ 1.03425 MPa: hg = 2779.4 kJ/kg; sg = 6.5748 kJ/kg – K

Use these values when necessary:
Specific Heat Ratio (k)
O2 - 1.395
CO2 - 1.288
Cpwater - 4.187 kJ/kg - K; Cpair - 1 kJ/kg - K; Cpateam - 2 kJ/kg - K
H> - 1.4
He - 1.667
NHа - 1.304
N2 - 1.399
Hg - 1.666
CH, - 1.321
1 kg
°C to K - (use + 273.15)
1 bar = 100 kPa
1 BTU = 1.055 kJ = 778 ft - lb
1 HP =
2.205 lb
0.746 kW = 2545 BTU/hr
@ 1.03425 MPa:
@ 2.5 MPa:
@ 7MPA and 550 deg C:
hg =
2779.4 kJ/kg; S, = 6.5748 kJ/kg - K
2803.1 kJ/kg; Sg
%3D
ha
6.2575 kJ/ kg - K
%3D
h, =
3530.9 kJ/kg; si = 6.9486 kJ/kg - K
Transcribed Image Text:Use these values when necessary: Specific Heat Ratio (k) O2 - 1.395 CO2 - 1.288 Cpwater - 4.187 kJ/kg - K; Cpair - 1 kJ/kg - K; Cpateam - 2 kJ/kg - K H> - 1.4 He - 1.667 NHа - 1.304 N2 - 1.399 Hg - 1.666 CH, - 1.321 1 kg °C to K - (use + 273.15) 1 bar = 100 kPa 1 BTU = 1.055 kJ = 778 ft - lb 1 HP = 2.205 lb 0.746 kW = 2545 BTU/hr @ 1.03425 MPa: @ 2.5 MPa: @ 7MPA and 550 deg C: hg = 2779.4 kJ/kg; S, = 6.5748 kJ/kg - K 2803.1 kJ/kg; Sg %3D ha 6.2575 kJ/ kg - K %3D h, = 3530.9 kJ/kg; si = 6.9486 kJ/kg - K
5. A steam engine develops 45 BHP with dry saturated steam at 1.03425 MPa and exhaust at
0.12411 MPa. Steam consumption is 750 kg/hr. Calculate the thermal efficiency of
equivalent Rankine Engine, in percent.
Transcribed Image Text:5. A steam engine develops 45 BHP with dry saturated steam at 1.03425 MPa and exhaust at 0.12411 MPa. Steam consumption is 750 kg/hr. Calculate the thermal efficiency of equivalent Rankine Engine, in percent.
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