Pe 013 refrigerant based dehumidification
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PE 013 Refrigerant based dehumidification PowerPoint PPT Presentation


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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.

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PE 013 Refrigerant based dehumidification

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Pe 013 refrigerant based dehumidification

PE 013Refrigerant based dehumidification


How do they work

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


The energy balance

The energy balance

Evaporator

Condenser

Warm, wet air

Cold, wet air

Warm dry air

4kWh

Compressor

Water

1kWh

3kWh


Simple energy costs

Simple energy costs

  • But there’s more….


A bit more physics

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


The project at red roofs nursery

The project at Red Roofs Nursery

  • 4 dehumidifiers in 6,000m2

  • Each unit

    • Consumes 10kW electricity

    • Removes 45 litres/hr of water


Energy facts figures

Energy facts/figures

  • 2013


Energy facts figures1

Energy facts/figures

  • 2014


Energy facts figures2

Energy facts/figures

  • Total heat use - 2013


Energy facts figures3

Energy facts/figures

  • Total heat use - 2014


Energy facts figures4

Energy facts/figures

  • Heat saved


Energy facts figures5

Energy facts/figures

  • Electricity used


Crop data

Crop data

  • 2013


Pe 013 refrigerant based dehumidification

Control

Dehumidifier


Crop data1

Crop data

  • 2014


Pe 013 refrigerant based dehumidification

Control

Dehumidifier


Financials

Financials

  • Check out the spreadsheet


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