OTEC – what is and why should we consider it?
Mr. Wayne Raymi Kijiner is the President of the Marshall Islands Student Association, University of the South Pacific, and Undergraduate: BSc Double Major Electrical/Electronic Engineering & Physics T here is a new but old technology making its way around the green energy discussions. I'm referring to Ocean Thermal Energy Conversion (OTEC). The technology has been understood since the 1800s, but it wasn't until the last 15 years that significant advancements were made and are currently being developed for improved designs. What exactly is OTEC, and how does it work? In a nutshell, it is the use of the temperature difference between the surface and the deeper parts of the ocean to heat and cool a working fluid (usually ammonia). Because the working fluid has a low boiling point, there is no need for a significant temperature difference; it should be at least 20°C. The working fluid is then heated using surface ocean water, causing it to turn into vapor ...