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Seawater Greenhouse

Charlie Paton

www.seawatergreenhouse.com

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1-3 kg oil 1000 kg water 1 kg crop

Economy of conventional desalinationfor agricultural use

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Sunlight + Seawater + Wind

Fresh Water + Cool, Humid Air

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Photosynthesis Action Spectrum

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Fan

Evaporator 2

Evaporator 1IR

Air flow

Condenser

Sunlight

Crops

Freshwater

Seawater intake andreturn

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Outside Inside

8 litres / m2 / day 1.2 litres / m2 / day

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Outside

Inside

Temperature

Inside

Outside

Relative Humidity

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The Seawater Greenhouse

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Greenhouse - Spain, Morocco, SG comparison

1 m2 Tomato crop over 1 year UK Spain Morocco SG+PV in Morocco

Energy use kWh/m2 480-560 0 0 0

Energy cost /m2 11 0 0 0

Greenhouse capital cost /m2 100 46 46 100

Finance cost @15% /m2 15 7 7 15

Yield Kg/m2/year 60 36 36 60

Labour /m2 16 8.5 4 10

Shipping to UK* /kg 4.5 9 15

Total fixed costs /m2 42 20 20 40

Overheads @ 20% of fixed costs /m2 8.4 4 4 8

Total expenses /m2 50 24 24 48

Crop Value @ 0.9/kg /m2 54.00 32 32 54

Profit /m2 4 8 8 6

* Shipping to UK - 0.124/kg from Spain, 0.25/kg from Morocco

(organic cherry vine tomatoes - 13 retail)

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Peak oil

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Source: New Scientist

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Cooling potential of Air at 30C

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Cooling Potential of Air at 40C

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Annual Precipitation in the MENA Region FAO 2007

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Seawater Greenhouse / CSP Synergies

Distilled water for turbines

Distilled water for cleaning mirrors Dust suppression from plants and evaporators

Use of waste heat for increased water production

Biomass Jatropha diesel For night time operation

Shared infrastructure

Shared ideal conditions hot, sunny remote desert

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Seawater Greenhouse

Charlie Paton

www.seawatergreenhouse.com

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