MODULE DESCRIPTOR
MECHGM06 – Heat Transfer and Heat Systems
Code:
Alt. Codes(s)
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Level:
UCL Credits/ECTS:
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Taught by:
MECHGM06
MECHGR06, MECHM007
Heat Transfer and Heat Systems
M
15/6
September
March
Dr Suen (50%) Module Coordinator
Dr Ducci (50%)
Prerequisites
Completion of second year Thermodynamics (MECH2004)
Course Aims
For the heat transfer part, three modes of heat transfer will be studied, and the heat systems part deals
with refrigeration and air-conditioning systems.
At the end of the course students will be able to:
• Evaluate the thermal radiation heat transfer between surfaces.
• Solve one-dimensional steady state conduction problems by applying the heat balance equation
and using thermal resistances through linear, cylindrical and spherical geometries.
• Determine the heat transfer occurring through a series of fins and their performance.
• Analyse convection problems and determine convection coefficients in external flow conditions,
flat plate, cylinder, tube bundles and in internal flow conditions, circular and concentric circular
tubes
• Design and dimension a heat exchanger system both by using the notions acquired in the
previous points and by applying the NTU method or the log mean temperature difference method
• Understand the operation of a vapour compression refrigeration system and how its operation
and performance depend on various internal and ambient conditions.
• Select appropriate refrigerant for a given application, characterize and choose suitable
components from catalogues to balance a refrigeration system according to certain design
specifications.
• Have a solid understanding of the Psychrometry of air conditioning processes and be able to
choose optimum supply design conditions by using notions of sensible heat, latent heat and room
ratio line.
Method of Instruction
Lecture presentations, tutorial classes and one piece of course assignment. Parts of the lecture notes
(Slides and tutorials) are made available in Moodle after the lecture.
Assessment
The course has the following assessment components:
• Written Examination (2 hours, 65%)
• A critical review/ appraisal of a chosen topic (e.g. a review of FDD methodologies in HVAC&R or
a review of modelling and simulation techniques in HVAC&R.)
To pass this course, students must:
• Obtain an overall pass mark of 50% for all sections combined
The examination rubric is:
Answer THREE questions, from FIVE offered. All questions carry equal weight.
Resources
•
Gosney W B, Principles of Refrigeration, Cambridge University Press, 1982.
•
Stoecker W F and Jones J W, Refrigeration and Air-conditioning, McGraw-Hill, 1982.
•
Fundamentals of heat and mass transfer”, Incropera, Dewitt, Bergman and Lavine, 6 Edition,
John Wiley & sons Inc.
th
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nd
•
Convection heat transfer, Bejan, 2
Edition, John Wiley & sons Inc.
•
Air Conditioning engineering, WP Jones, 5 Edition, Elsevier Butterworth-Heinemann
•
Heating, ventilating, and air conditioning: analysis and design, McQuiston, Parker and Spitler, 6
edition, John Wiley & sons Inc.
th
th
Additional Information
Module title under review.
Content (total number of lecture and tutorial hours approx. 44 hours)
Thermal Radiation
• Black and grey body radiation
• View factor
• Thermal radiation exchange between surfaces
• Radiation shields
Conduction
• The conduction rate equation and heat diffusion equations
• Boundary and initial conditions
• One-dimensional steady state conduction
• Thermal and contact resistance
• Conduction with thermal energy generation
• Heat transfer from extended surfaces
• A general conduction analysis
• Fin Performance
• Overall Surface efficiency
Convection
• The convection boundary layers
• The velocity boundary layer
• The thermal boundary layer
• Local and averaged convection coefficients
• Laminar and turbulent flow
• The boundary layer equations
• Boundary Layer similarity
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Boundary Layer analogies
• The Reynolds Analogy
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External Flow
The flat plate in parallel flow
Turbulent flow over an isothermal plate
Mixed boundary layer conditions
Flat plate with constant heat flux conditions
Methodology for a convection calculations
The cylinder in cross flow
Flow across banks of tubes
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Internal Flow
Hydrodynamic considerations
Flow conditions
Velocity profile in the fully developed region
Pressure gradient and friction factor in fully developed flow
Thermal considerations
Fully developed conditions
The energy balance
Constant surface heat flux
Constant surface temperature
Convection correlations
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Heat exchangers
Heat exchangers types
The overall heat transfer coefficient
Heat exchanger analysis: Log mean temperature difference and Effectiveness –NTU method
Heat exchanger design and performance calculations
Refrigeration
• Introduction to vapour compression refrigeration/heat pump cycle
• Refrigerant properties, selection and application
• Evaporator and condenser : types and characterization
• Compressor types and characterization
• System analysis and balancing
Air Conditioning
• Meaning and Need and for Air Conditioning
• Comfort conditioning
• Industrial conditioning
• Psychrometry of air conditioning processes
• The pyschrometric chart
• Choice of supply design conditions
• Sensible and latent heat removal
• The slope of the room ratio line
• Examples of air conditioning systems
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1
Learning Outcomes MECHGM06, MECHGR06, MECHM007
General Learning Outcomes
Ability to develop, monitor & update a plan, to reflect a changing operating environment
N/A
Ability to monitor and adjust a personal program of work on an on-going basis, and to learn
independently
As with all taught modules on the programme a significant amount of self learning is expected. The
critical review report requires self study and time management.
The ability to exercise initiative and personal responsibility, which may be as a team member or
leader
N/A
The ability to learn new theories, concepts and methods etc and apply these in unfamiliar
situations
The module is designed to present new subject matter at M level understanding of which is then
tested by an exam and a critical review of a specified topic ( e.g. Review of FDD methodologies in
HVAC&R, a review of modelling and simulation techniques in HVAC&R or a review of
unconventional/hybrid refrigeration systems).
Specific Learning Outcomes
Underpinning science & Mathematics
A comprehensive understanding of the relevant scientific principles of the specialisation
Although many students will have studied thermodynamics material (i.e. basic refrigeration cycle and
psychrometrics) at undergraduate level, the module is designed to cover more practical aspects on
refrigeration and air conditioning system design and evaluation, as well as additional topics on heat
transfer.
A critical awareness of current problems and/or new insights much of which is at, or informed by,
the forefront of the specialisation.
The module particularly addresses the latest development and application of alternative refrigerants
for reducing the global warming impact of HVAC&R systems, as well as refrigeration
component/system optimization.
An understanding of concepts relevant to the discipline, some from outside engineering, and the
ability to critically evaluate and apply them effectively.
This feature is developed in the coursework element where the students are asked to write a critical
review of a specified topic (e.g. Review of FDD methodologies in HVAC&R, a review of modelling
and simulation techniques in HVAC&R or a review of unconventional/hybrid refrigeration systems).
Understanding in many relevant and related disciplines is required. Interaction with course supervisor
at various stages is essential.
1
EAB website http://www.engab.org.uk/documentation document Accreditation Of Masters Degrees Other Than MEng last
accessed 10 Aril 2012
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Engineering Analysis
Ability to use fundamental knowledge to investigate new and emerging technologies
New concepts/approaches are studied and evaluated in the coursework element of the module.
Ability to apply appropriate models for solving problems in engineering and the ability to assess
the limitations of particular cases;
Students are taught how to evaluate different design options for optimization based on
product/component information, meeting client’s specifications.
The ability to collect and analyse research data and use appropriate engineering tools to tackle
unfamiliar problems, such as those with uncertain or incomplete data or specifications, by the
appropriate innovation, use or adaptation of engineering analytical methods.
N/A
Design
The ability to apply original thought to the development of practical solutions for products,
systems, components or processes
N/A
Economic, Social and Environmental Context
Knowledge and understanding of management and business practices, and their limitations, and
how these may be applied appropriately, in the context of the particular specialisation
N/A
The ability to make general evaluations of risks through some understanding of the basis of such
risks
N/A
Engineering Practice
A thorough understanding of current practice and its limitations, and some appreciation of likely
new developments
A significant part of this module addresses the latest development and practice in refrigerant
selection regarding GWP and ODP issues.
Advanced level knowledge and understanding of a wide range of engineering materials and
components
N/A
The ability to apply engineering techniques taking account of a range of commercial and industrial
constraints
N/A
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