Ocean Thermal Energy Conversion TU Delft - OTEC 8 months ago   05:13

Ocean Thermal Energy Conversion (OTEC) is a process that can produce electricity by using the temperature difference between deep cold ocean water and warm tropical surface waters. OTEC plants pump large quantities of deep cold seawater and surface seawater to run a power cycle and produce electricity. OTEC is firm power (24/7), a clean energy source, environmentally sustainable and capable of providing massive levels of energy.

See http://www.makai.com/ocean-thermal-energy-conversion/ for more

Comments 88 Comments

Jim Baker
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Can anyone tell me what the name of the device he is holding at 3:24 ?
Jake Floyd Fabian
stupid. "heat exchanger is a fancy name but all it's doing is separating two fluids from mixing, separating ammonia from the seawater" it's not separating ammonia from seawater 'coz they're already separated. that's not the main purpose of the heat exchanger on your system.
Manish Kumar
This is one of the most coolest thing i have ever seen..
Toxic Reverend
Could the OTEC system be modified to absorb excessive heat from the cooling towers of Nuclear Power Plants and or the spent fuel rod storage pools ?
Such a system MIGHT have a Return On Investment and MIGHT be able to power a safe shut down in an emergency with or without diesel generators. All of which can present some very real problems and the OTEC may very well be a viable solution.
Toxic Reverend
Ocean Thermal Vents electrical power generation

The Marshall deep-ocean hydrothermal vents System
​Website:> http://www.marshallhydrothermal.com

Some additional Information in the comments, after the main posting at;
José Schz
Does anyone knows what software they used to model the system, i would like to do one myself.
Thanks. Ocean Thermal Energy Conversion (OTEC) is on my test (Environmental Sciences). Please leave your video posted. It was helpful.
Maulidina _nr
otec ini kalau berdasarkan siklusnya terbagi menjadi 3, salahsatunya adalah siklus terbuka. pada siklus tertutup, uap fluida kerja (misal amonia) didinginkan menggunakan suhu air laut dalam, dengan tujuan untuk mengubah uap td menjadi cairan kembali sehingga bisa digunakan pd siklus selanjutnya. Sedangkan pd siklus terbuka, fluida kerja yg digunakan berupa air laut itu sendiri. ketika pd tahap kondensasi yakni pendinginan uap tersebut dengan menggunakan suhu air laut dalam, uap tsbt berubah menjadi cairan lg berupa air tawar, dimana cairan trsebut dibuang kembali ke laut. jd air bekas digunakan sebelumnya tdk dipakai lg pada siklus berikutnya. pertanyaan saya, seandainya kita tidak memakai kondensor pd siklus terbuka tsbt, apakah bisa? toh air bekas kondensasi juga dibuangkan? klo logika saya, tdk pakai kondensor pun bisa. mohon pencerahannya.
wahidixe wahidixe
Why they not more build otec power plant?
John Lee
Is rotating a turban really the most efficient way of extracting work from this system?
Ted Rees
Heat engines have a maximum efficiency limited by (Thigh-Tlow)/Thigh, where Temperature is in Kelvin. But, practical heat engines have about half of that efficiency, because of the cost of the heat exchangers. Pick some numbers, suppose the deep water is at 32F, and the surface is at 80F. That is 0C and 27C, or 273K and 300K. The maximum efficiency is 27/300 = 9%. The maximum practical efficiency is about 5%.
The power available is 1 cal/gm-C, or 27 x 1e6 x 4.184 = 31.38 KWH/cubic meter of flow. But only about 5% of this can be harvested or 1.5 KWH/cubic meter of flow. That is still a lot of energy. Has anyone made a prototype?
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Carmela Gonzales
Does anyone know if they conducted an Environmental Impact Assessment/Statement for this specific plant?
Tom Kelly
This is amazing! I am so glad that you are doing this! I would love to hear more about your efficiency in this system. It seems to me that the greater the temperature difference the greater the power output. It will certainly require the optimal liquid to boil and condense in the loop. 

I guess colder water means less pumping for the same amount of electricity right? This system can be coupled with solar farms, wind farms, and wood/refuse burners to provide additional heat or power as well as clean input for pumping.
Mrigank Bhattacharyya
awesome video.. thanks
Suharsh Tyagi
Stunning! Thanks
What sort of surface water temperatures do you need? Sounds like this might work for Florida but not for North Carolina.
Muhammad Arifin
Thanks for information in this movie. I think OTEC technology very potential in Indonesia. I hope we can implementation this technologi in Indonesia.
Any help me can information spesification technic and calculation efficiency this technology ?
Hi, I have a question. Seems like in general, the temperature difference between warm surface water and deep ocean cold water is about 20°C. How would be the efficiency or performance different if the temperature difference is higher than 20°C, let's say 50°C or more?? would that be more efficient??
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TU Delft - OTEC Ocean Thermal Energy Conversion 8 months ago   01:32

Ocean Thermal Energy Conversion (OTEC) is a renewable energy technology that uses the natural temperature difference in oceans to produce clean, reliable electricity, day and night, year-round. It works best in the tropical, equatorial zone. Here the ocean temperature difference is at least 20 degrees Celsius throughout the year. OTEC can become an important renewable energy source.

Delft University of Technology conducts research to develop innovative solutions for OTEC. Today's ongoing research at Delft University of Technology is focussed on the main engineering challenges, related to the process, electrical and offshore equipment. For more information, please visit: http://www.oceanenergy.tudelft.nl/thermal-gradient-otec/

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