Semester

Semester 2, 2018

• Michael Kingan
• Stuart Norris (director, coordinator)
• Alison Subiantoro

Second Law of Thermodynamics, entropy. Cycles and applications. Heat transfer, heat exchangers. Prerequisite: MECHENG 211

Further notes

Aim: To advance the students’ understanding of thermodynamics and heat transfer principles and their applications to real engineering systems. The course builds on material introduced in the course MECHENG 211 Thermo-Fluids.

Prescribed Textbook: Cengel, Y.A., Cimbala, J.M. and Turner, R.H.: Fundamentals of Thermal-Fluid Sciences, 5th Ed in SI Units, McGraw Hill, 2017.

This paper introduces many concepts which you must understand and the material does not lend itself to last-minute cramming for the exam. You are therefore expected to attend the tutorials, and own the Prescribed Text. To successfully complete this course you are expected to study this topic for 6 hours per week in addition to the 4 contact hours (lectures and tutorial).

Approximate programme and syllabus [references are to the prescribed textbook]:

Thermodynamics and the Second Law: Weeks 1-4
Thermodynamics Introduction/revision, [Ch. 1 to 6] (2 lectures)
Properties, ideal gases, conservation of mass, momentum and energy.
Second law, [Ch. 7] (4 lectures)
Heat engines, refrigerators, thermal efficiency, The Second law of thermodynamics, Carnot cycle and efficiency limits, temperature scales.
Entropy, [Ch. 8] (6 lectures)
Clausius inequality, entropy, lost work, increase of entropy. Applications, calculation of entropy, entropy changes in gases liquids and solids, isentropic and polytropic processes, isentropic efficiency, Irreversibility, availability, effectiveness.

Thermodynamic Cycles: Weeks 5-8
Thermodynamic Cycles, [Ch. 9] (6 lectures)
Introduction to cycles. Ideal gas and vapour power cycles.
Thermodynamic Applications, [Ch. 9] (6 lectures)
Refrigeration and heat pump cycles. Regeneration, advanced cycles.

Heat Transfer: Weeks 9 to 12
Heat transfer by conduction and convection, [Ch. 17,19, 20] (4 lectures)
Basic physics of convection; forced and free, internal and external.
Convection and Heat exchangers, [Ch. 22] (3 lectures)
LMTD method, parallel and counter flow balanced heat exchangers. Effectiveness methods.
Radiation, [Ch. 21] (5 lectures)
Basic concepts, Shape factors, radiosity, Radiant heat transfer between two and three surfaces.

Assessment:
Laboratories:
Air compressor [TH], Room 402.221
Heat exchanger [HT], Room 402.211

Quizes: Weeks 3, 6, 9, 12 (Online)
Test: Week 7 (Restricted Book)
Exam: 3 hours (Restricted Book).

Weighting:
The coursework is weighted 30% and the exam 70%. For the coursework items the weighting is as follows:

Each laboratory: 2 labs @ 5 = 10%
Test (restricted book): 1 test @ 12 = 12%
Quizes (online) 4 quiz @ 2 = 8%
Total Cousework Marks = 30 %

Exam (3 hours, Restricted book) = 70%

Students are urged to discuss privately any impairment-related requirements face-to-face and/or in written form with the course convenor/lecturer and/or tutor.

Note that coursework grades cannot be transferred from a previous year if you are re-sitting this paper, i.e. you must do laboratories and tests to get any credit.

The University of Auckland will not tolerate cheating, or assisting others to cheat, and views cheating in coursework as a serious academic offence. The work that a student submits for grading must be the student's own work, reflecting his or her learning. Where work from other sources is used, it must be properly acknowledged and referenced. This requirement also applies to sources on the world-wide web. A student's assessed work may be reviewed against electronic source material using computerised detection mechanisms. Upon reasonable request, students may be required to provide an electronic version of their work for computerised review.

All students enrolled at the University of Auckland are required to complete a compulsory Academic Integrity course, usually in their first semester/year of enrolment. The University of Auckland’s full guidelines on procedures and penalties for academic dishonesty are available here.