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MTX 311 Special Exam 2015 memo $2.85   Add to cart
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MTX 311 Special Exam 2015 memo
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  • Course
  • MTX 311 (MTX311)
  • Institution
  • University Of Pretoria (UP)
  • Book
  • Fundamentals of Thermodynamics

Exam MTX 311 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

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Document information

  • March 11, 2021
  • 2
  • 2020/2021
  • Exam (elaborations)
  • Questions & answers

Subjects

  • mtx 311
  • exam memo
  • thermodynamics
  • engineering
  • mtx 311 special exam 2015 memo

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Thermodynamics MTX 311

Special Exam: June 2015

Examiner

Dr AS Lexmond (University of Pretoria)

Instructions

1 Time: 90 min.
2 Full marks: 90
3 Neatness saves you points, especially when only part of the question is correct.
4 Give the equations before you start filling in numbers; for the questions marked with an
*, also give a short but clear solution strategy
5 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”
6 For all questions: use a reference temperature and pressure of T0=25°C, P0=1 bar



A group of four MOX students had to design a energy recovery system for me this year. This
question is about the design that one of them came up with, where I was quite unhappy with the
low efficiency of his system.

In the current factory, a process steam of 16kg/s of hot ore of 1000°C is mixed with a large amount
of water to cool it down; the water evaporates and gets lost and the heat is lost as well. In an
improved design, the student proposes to generate steam in a fluidized bed. Equipment design is
given in fig. 1. Air is blown through the hot ore, which make the ore pellets float. As a result, the ore
pellets mixture behaves as a fluid, resulting in very high heat transfer rates.




Fig. 1 process design of a fluidized bed heat regenerator

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