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PE 013 Refrigerant based dehumidification

Date post: 04-Jan-2016
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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. - PowerPoint PPT Presentation
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© 2013 Farm Energy Centre PE 013 Refrigerant based dehumidification
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Page 1: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

PE 013Refrigerant based dehumidification

Page 2: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

They’re just a decent size refrigeration unit

How do they work?

Warm, wet air

20oC85% RH15g/m3 of water

Cold air

16oC100% RH14g/m3 of water

Warm dry air

30oC45% RH14g/m3 of water

Evaporator Condenser

Water

Compressor

Page 3: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

The energy balance

Warm, wet air

Cold, wet air

Warm dry air

Evaporator Condenser

Water

Compressor

1kWh3kWh

4kWh

Page 4: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Simple energy costs

• But there’s more….

Cost of electricity

Cost of heat (CoP of 4.0)

Equivalent cost of gas (85% efficient boiler)

9 p/kWh 2.3 p/kWh 1.9p/kWh (56p/Therm)

6p/kWh 1.5p/kWh 1.3p/kWh (37p/Therm)

Page 5: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

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

Cost of electricity

Cost of heat (CoP of 5.0)

Equivalent cost of gas (85% efficient boiler)

9 p/kWh 1.8 p/kWh 1.5p/kWh (45p/Therm)

6p/kWh 1.2p/kWh 1.0p/kWh (30p/Therm)

Page 6: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

The project at Red Roofs Nursery

• 4 dehumidifiers in 6,000m2

• Each unit– Consumes 10kW electricity– Removes 45 litres/hr of water

Page 7: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• 2013

Page 8: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• 2014

Page 9: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• Total heat use - 2013

Page 10: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• Total heat use - 2014

Page 11: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• Heat saved

Page 12: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Energy facts/figures

• Electricity used

Page 13: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Crop data

• 2013

Page 14: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Dehumidifier

Control

Page 15: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 16: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 17: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 18: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Crop data

• 2014

Page 19: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Dehumidifier

Control

Page 20: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 21: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 22: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Page 23: PE 013 Refrigerant based dehumidification

© 2013 Farm Energy Centre

Financials

• Check out the spreadsheet


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