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Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter22: Condensers
Section: Chapter Questions
Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...
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QUESTION ONE
a. Explain the two primarily classification of boilers and also differentiate between
supercritical and critical boilers arrangements.
b. Briefly explain five accessories and their functions installed inside and outside the
boiler.
c. In a steam power plant operating on ideal Rankine cycle, steam enters the turbine
at 20 bar with an enthalpy of 3248 kJ/kg and an entropy of 7.127 kJ/kg K. The
condenser pressure is (0.1 bar. Find the cycle efficiency and specific steam
consumption in kg/kWh. Do not neglect pump work. Hint 1 bar
100 kPa, V3
= 0.001 m3/kg at 0.1 bar from steam tables*
Use the extract of steam table given below.
Vf
t
h₂
Р
(bar)
20.0
0.1
(°C)
212.4
45.81
908.8
191.83
kJ/kg
hg
1890.7
2584.7
S₁
2.447
0.6493
=
kJ/kg
6.331
8.1502
Transcribed Image Text:QUESTION ONE a. Explain the two primarily classification of boilers and also differentiate between supercritical and critical boilers arrangements. b. Briefly explain five accessories and their functions installed inside and outside the boiler. c. In a steam power plant operating on ideal Rankine cycle, steam enters the turbine at 20 bar with an enthalpy of 3248 kJ/kg and an entropy of 7.127 kJ/kg K. The condenser pressure is (0.1 bar. Find the cycle efficiency and specific steam consumption in kg/kWh. Do not neglect pump work. Hint 1 bar 100 kPa, V3 = 0.001 m3/kg at 0.1 bar from steam tables* Use the extract of steam table given below. Vf t h₂ Р (bar) 20.0 0.1 (°C) 212.4 45.81 908.8 191.83 kJ/kg hg 1890.7 2584.7 S₁ 2.447 0.6493 = kJ/kg 6.331 8.1502
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