How to be Cool

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How to be Cool
Mike Dennis Department of Engineering
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How do we get Cool
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Air Conditioning
Condensor
35C
2 kW Compressor
Expansion valve
8C
Evaporator
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Now youre cool, but expensive
Peak loading on electricity grids 30b required
to upgrade grids over the next 20 years

2/3 of all houses in Australia have air
conditioners Big energy consumers!
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Dont be silly
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Greenhouse Neutral House
Houses as distributed power stations
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Solar Air Conditioning
Condensor
35C
2 kW Compressor
Expansion valve
8C
Evaporator
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Photovoltaic Air Conditioning
Vapour Compression
Peltier Cell
Stirling Cycle
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Thermal Air Conditioning
Dessicant / Evaporative cooling
Absorption cooling
Adsorption cooling
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Thermal Air Conditioning
Ejector Cycle
Organic Rankine Cycle
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The Ejector Cycle
COP 3
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Cool, warm and wet

• One system
• High solar contribution
• Three energy services

Evaporator
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Leveraged Operation
0.1kW
35C
90C
20C
Intercooler
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The Ejector (compressor)

• Need high secondary flow
• Need high compression ratio

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Ejector thermal compressor
Inside the solar nozzle
Diffuser
Mixing Chamber
Solar fluid nozzle
Vacuum port
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Sensitivity
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Progress to Date
This work is supported by the Faculty Research
Grant Scheme (FRGS)
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Research Directions
Improved flexibility Variable geometry
ejector Smart control and actuation
strategies Improved cogeneration and integral
thermal storage Improved performance Dynamic
optimisation of coupled operation Liquid
pressure amplification Improved CFD
models Mixing phenomena
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