Sea Water Air Conditioning Using deep sea water for ecological and affordable cooling solutions Deprofundis A new solution for middle sized structures Baptiste Bassot Presentation to Green Mondays 27/10/2008
Jun 10, 2015
Sea Water Air Conditioning
Using deep sea water for ecological and affordable cooling solutions
Deprofundis
A new solution for middle sized structures
Baptiste BassotPresentation to Green Mondays27/10/2008
Cold generation 101
Necessary for Modern SocietyProcessesConfort
How do we produce cold?Force the opposite of a natural phenomenon
High costsEnergy intensiveGas
A sucessful approach: SWAC systems
In Toronto, Lake Ontario waters cooling 51 high-rise buildings, using 10% of conventional systems energy
Curaçao, Netherlands Antilles, Evelop Crp:90% electricity and CO2 emissions saved
Still in infancy, yet showing potential: OTEC systems
Ocean Thermal Energy Conversion
The opposite of a conventional a/c system!
Like all geothermal energy sources
Back to SWAC: Energy gains
Cooling power
0
100
200
300
400
500
0 20 40 60 80 100 120 140 160 180 200Water flow (m³/s)
Co
olin
g P
ow
er
(kW
ce)
0
5
10
15
20
25
Te
mp
erat
ure
(°C
)
Energy savedWater arrival temperature
The cavitation problem
Cavitation in water phase diagram Cavitation damages on a pump
T°
P
Cavitation
Boil
Ice
Liquid water
Steam
Cavitation and suction limit speed
Maximum speed in suction
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
1,6
1,8
0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7
Pipe outside diameter (m)
Ma
xim
um
cir
cu
lati
on
sp
ee
d
(m/s
)
Max speed in suction
Energy balance
Energy balance
0
100
200
300
400
500
0 20 40 60 80 100 120 140 160 180 200Water flow (m³/h)
Po
wer
(kW
)
Total pumping energyEnergy savedBalance
P1 : Maximum succion point
P2 : Energy optimal point
Our solution
Classical SWAC system Deprofundis closed loop
Final energy balance
Energy balance : classical system and closed loop
0
100
200
300
400
500
0 20 40 60 80 100 120 140 160 180 200Water flow (m³/h)
Po
wer
(kW
)
Balance (open loop)Balance (closed loop)
P1 : Maximum succion point
P2 : Energy optimal point
P3 : Closed loop optimal point
Immersed heat exchanger
Geometry Massively parallel
Size 6 modules 3m x 3m x3m (400 Kg) each
Environmental topics
• Radius of 5 km of a depth of – 600m (in tropical waters)
• Material used (PEHD used for pipes, titanium for heat exchanger): no exchange with the environment for decades. Able to be re-used indefinitely + recycled
Advantages
Thin pipes Available in rolls Easy to handle Easy to deploy
Suitable for remote locations
Closed loop Control on the
circulating water No end-pipe filter No risk of aspirating
sea material Easy maintenance
A special offer
• location (distance and relief) options (PV / wind solutions for the pump) electricity costs subventions
ROI 5 years in average, for a solution least 20 years.
Parameters of a characteristic site for the study:
Intake depth : 800m (5°C) - output water 14°C
Pipe of 2150 m in PEHD : diameter 150-123mm
Open Topics for Q&A:
• Tap into different energy sources• Cold generation• Sea Water energy systems• Energy ventures
• Interesting?• Interested?• Sleepy/Hungry?
Thank you for your attention