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How to be Cool

How to be Cool. Mike Dennis Department of Engineering. How do we get “Cool”. Electricity consumed here. Air Conditioning. Condensor. 35°C. Expansion valve. 2 kW Compressor. 8°C. Evaporator. Now you’re cool, but expensive. Peak loading on electricity grids

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How to be Cool

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  1. How to be Cool Mike Dennis Department of Engineering

  2. How do we get “Cool”

  3. Electricity consumed here Air Conditioning Condensor 35°C Expansion valve 2 kW Compressor 8°C Evaporator

  4. Now you’re 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!

  5. Don’t be silly…

  6. Greenhouse Neutral House Houses as distributed power stations

  7. Electricity consumed here Solar Air Conditioning Condensor 35°C Expansion valve 2 kW Compressor 8°C Evaporator

  8. Condensor Evaporator Hot Side N P N P N P Cold Side Expansion Compression Photovoltaic Air Conditioning Vapour Compression Peltier Cell Stirling Cycle

  9. Gen Condensor Abs Evaporator Condensor Evaporator Thermal Air Conditioning Dessicant / Evaporative cooling Absorption cooling Adsorption cooling

  10. Condensor Evaporator Condensor Condensor Evaporator Thermal Air Conditioning Ejector Cycle Organic Rankine Cycle

  11. 16m2 0.1kW 35°C 35°C Condensor Condensor 1kW 90°C 8°C 8°C Evaporator Evaporator Conventional heat pump Ejector heat pump COPe = 0.7, COPm = 30 The Ejector Cycle COP = 3

  12. Condensor Winter space heating Water heating Cool, warm and wet • One system • High solar contribution • Three energy services Evaporator

  13. Smaller collector Condensor Intercooler 0.4kW Reduced electricity consumption 8°C Increased cooling effect Evaporator *** Retro-fit solution and night operation possible *** Leveraged Operation 0.1kW 35°C 90°C 20°C Intercooler

  14. Solar heated primary Sonic shock Evaporator seondary The Ejector (compressor) • Need high secondary flow • Need high compression ratio

  15. Ejector thermal compressor Inside the solar nozzle Diffuser Mixing Chamber Solar fluid nozzle Vacuum port

  16. Sensitivity

  17. Progress to Date This work is supported by the Faculty Research Grant Scheme (FRGS)

  18. 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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