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PE 013 Refrigerant based dehumidification

PE 013 Refrigerant based dehumidification. How do they work?. They’re just a decent size refrigeration unit. Evaporator. Condenser. Warm, wet air. Warm dry air. Cold air. 20 o C 85% RH 15g/m 3 of water. 16 o C 100% RH 14g/m 3 of water. 30 o C 45% RH 14g/m 3 of water. Compressor.

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PE 013 Refrigerant based dehumidification

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  1. PE 013Refrigerant based dehumidification

  2. How do they work? They’re just a decent size refrigeration unit Evaporator Condenser Warm, wet air Warm dry air Cold air 20oC 85% RH 15g/m3 of water 16oC 100% RH 14g/m3 of water 30oC 45% RH 14g/m3 of water Compressor Water

  3. The energy balance Evaporator Condenser Warm, wet air Cold, wet air Warm dry air 4kWh Compressor Water 1kWh 3kWh

  4. Simple energy costs • But there’s more….

  5. A bit more physics • What happens when the vents are open? • Lose the energy in the water vapour (latent heat) • Lose the energy in 20oC air that is replaced with say 10oC air (specific heat) • This adds 1 to the CoP • New CoP is 5.0

  6. The project at Red Roofs Nursery • 4 dehumidifiers in 6,000m2 • Each unit • Consumes 10kW electricity • Removes 45 litres/hr of water

  7. Energy facts/figures • 2013

  8. Energy facts/figures • 2014

  9. Energy facts/figures • Total heat use - 2013

  10. Energy facts/figures • Total heat use - 2014

  11. Energy facts/figures • Heat saved

  12. Energy facts/figures • Electricity used

  13. Crop data • 2013

  14. Control Dehumidifier

  15. Crop data • 2014

  16. Control Dehumidifier

  17. Financials • Check out the spreadsheet

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