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J.G. Pharoah
214 McLaughlin Hall
533-6579
Department of Mechanical
Engineering
Queen's UniversityKingston, Ontario,
Canada, K7L 3N6
Mech 346: Heat Transfer
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Overview
Introduction to J. Pharoah
Membrane Separation
Power Generation
Cooling
Overview of Mech 346
Heat Transfer Examples
Space Shuttle
Fuel Cells
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Membrane Separation
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Membrane Separation
RetentatePermeate
Membrane
Feed
Feed spacer
Permeate spacerFeed flow
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Rotating Membrane Separation
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Power Generation
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Vehicle Cooling
Goal: Operate Motor at Correct Temperature
Compartmentalization:
Design a MotorT, Power
Design a fanDelta P, Q
Design a heat exchangerT, Q2
Design a water pumpQ2, P
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Vehicle Cooling 2
This approach can and will fail
even though each sub-problemworks in isolation.
The complete problem
involves:
Complex fluid flows
Interaction with external
aerodynamicsConvective heat transfer
Radiation heat transferCompartmentalization also limits
the range of designs
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Towards Integration
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Electronic Cooling
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Mech 346
Everything in this course is about conservation of
energy.
Energy is conserved the rest are details.
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Mech 346 continued
Details with which we will concern ourselves
Conduction
Convection
Radiation
Heat Exchangers (very brief)
Lobby for advanced elective if you want more
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Heat Transfer Examples
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The Space Shuttle
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The Space Shuttle
Re-Entry Tmax = 1650 C
Hydrogen -253 C
Million gallons (6:1 Oxygen:Hydrogen)
Exhaust Nozzle Tmax = 3500 C
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Fuel Cells
Solid Oxide Fuel Cell (SOFC) High Temperature
Proton Exchange Membrane (PEMFC) Low Temperature
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Solid Oxide Fuel Cel
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SOFC
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Seimens Westinghouse SOFC Unit
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Transport Phenomena in a PEMFuel Cell
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Transport Phenomena in a PEM
Fuel Cell
Anode FlowChannel
Cathode FlowChannel
O2
H2
convection/diffusion of reactants towards catalyst
electrochemical reactions
H+
migration of H+ through the membrane
transport of H2Ol through the membrane
multi-phase flow (phase change of H2O)
convective heat and mass transport in flow channels
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Gas flow channel
Anode side
Membrane
Porous diffusion
layer
Gas flow channel
Cathode side
Porous diffusion
layer
Base Case Dimensions:
Channel size (l x h x w): 30 mm x 1 mm x 1mm
Membrane thickness: 0.23 mm
GDL thickness: 0.20 mm
PEM Fuel Cell With Cooling Channel
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My Philosophy
Everyone in this room can take the textbook and
complete every problem in it.
There is no value in me reading you the texbook.
The value is in what I can add to your
understanding.
I am looking for you to UNDERSTAND the
material, not just be able to reproduce a problemsolution!!
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The Thermos
Why is the 0.5l bottle worse than the 1.0l bottle?
