semester test 2 MTX311 2015 worked out solutions. The memorandum has solutions are 100% correct including alternative working methods. The solutions are done in a step by step matter
Fundamentals of Thermodynamics, 10th Edition Chapter 2 Practice Problems
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University of Pretoria (UP)
MTX 311 (MTX311)
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Thermodynamics MTX 311
Semester test 2: May 2015
Examiner
Dr AS Lexmond (University of Pretoria)
Instructions
1 Time: 90 min.
2 Answer all the questions
3 Full marks: 100
4 Neatness saves you points, especially when only part of the question is correct.
5 Give the equations before you start filling in numbers; for the questions marked with an
*, also give a short but clear solution strategy
6 You are allowed to take fundamentals of thermodynamics (7th or 8th edition), non-ideal
gas hand-out, one page, A4, with your own notes (both sides) and all the material from
the click-up page “lectures”
7 For all questions: use a reference temperature and pressure of T0=25°C, P0=1 bar
All questions in this test have to do with a system to cool a chemical reactor that is being operated at
125K. Overall efficiency of this process is unacceptably low; that’s why a thermodynamic analysis is
required. Fig. 1 gives an overview of the combined power-cooling cycles, table 2 gives the process
stream characteristics and table 2 gives equipment description.
630 kW D
1800K
11 surroundings
I
4 14 15
H N
3 8 9
K
A E F G J
2
B 16
1 5
O L
7 10 13
C
6 M
15 kW
Question 5 Question 2 125K 12
work
description kW
A compressor -208
B&C regenerator
D heater
E turbine 409.2
F non- adiabatic compressor -900.9
G turbine 751
H&I gas cycle heat exchanger
O reactor cooler
J R134A cycle compressor -47.5
K expansion nozzle
L&M R134A heat exchanger
N condenser
shaft friction -3.8
1) What are the second law efficiency and the irreversibility of the entire process (the combined
power-refrigeration process)?
2) What are the second law efficiency and the irreversibility of the low-temperature (air based)
compression expansion cooling cycle (containing process flows 7-10)
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