Pdf ocean thermal energy conversion

Here youll find a collection of information on this historic project, as well as information on otec technology, news, and posts from facility staff. Ocean thermal energy conversion the large ocean surface acts as a reservoir of solar energy. It relies on the oceans thermal gradient the temperature decline from the sunwarmed waters on the surface to. The stored thermal energy is completely renewable so that ocean thermal energy use will not reduced the stored energy quantity.

Otec system is smaller than that in the conventional thermal or nuclear power systems, and subsequently the thermal ef. Ocean thermal energy conversion otec is considered as a promising resource of energy in the future. Abstract ocean thermal energy conversion otec is the use of a high surface temperature of the water with the low temperature of the water at a certain depth thus creating a heat engine. It relies on the oceans thermal gradient the temperature decline from the sunwarmed waters on the surface to the cold waters found at great depths. Wave energy conversion and ocean thermal energy conversion. Ocean thermal energy conversion otec types renewable. Wave energy conversion and ocean thermal energy conversion potential in developing member countries. After moving to hawaii in 1987, he was involved in research on ocean thermal energy conversion for more than a decade. Warm seawater is taken in from the surface of the oceans and cold water from the deep at 5 o. The technological concept to harvest the thermal energy in the ocean is universally called ocean thermal energy conversion otec.

Open cycle ocean thermal energy conversion system in this system, the warm water from the ocean surface is fed to the deaerator. Ocean thermal energy is thus considered a reliable source of energy due to having minimal variations. Between now and the 1990s there is a requirement to. This is the first true closedcycle ocean thermal energy conversion otec plant to be connected to a u.

A project certified by the department of energy doe as a demonstration project is exempt from being required to obtain an otec license from noaa, pursuant to the. Ocean thermal energy conversion otec is a process or technology for producing energy by harnessing the temperature differences thermal gradients between ocean surface waters and deep ocean waters. Pdf potential of 100 kw of ocean thermal energy conversion. The governor of hawaii, david ige, flipped the switch to activate the plant. A preliminary assessment of ocean thermal energy conversion. Pdf this paper presents different roots of ocean thermal energy conversion otec strategies and challenges faced in terms of efficiency. Ocean thermal energy conversion otec, form of energy conversion that makes use of the temperature differential between the warm surface waters of the oceans, heated by solar radiation, and the deeper cold waters to generate power in a conventional heat engine. Ocean thermal energy conversion simple english wikipedia. Ocean thermal energy conversion produces energy from temperature differences in ocean waters. Ocean thermal energy conversion otec has become a serious contender for development as an economic power generation system for the last decade of this century, since the cost of conventional fuels particularly oil rose during and from 1973. Ocean thermal energy conversion otec harnesses the difference in temperature between the surface water about 25c and the water at depth about 5c at depths greater than m based on the principle of thermal exchange.

Otec oceanthermalenergyconversion,theprocess of converting the ocean thermal energy into electricity. Introducing ocean thermal energy as efficient and viable solution to increasing energy demands, this presentation also brings out how. An ocean thermal energy conversion power plant built by makai ocean engineering went operational in hawaii in august 2015. Makais otec work is conducted at the ocean energy research center oerc, located within the natural energy lab of hawaii authority nelha in kailua kona, hawaii. When otec is implemented in 5 % of the earth surface area which is 7% of the ocean covered area,less than 15 % of the tropical ocean area, the 3% conversion efficiency will be sufficient to provide energy at 0. A signircant fraction of solar radiation incident on the ocean is retained by seawater in tropical. Advantages and limitations of ocean thermal energy conversion. Ocean thermal energy conversion otec generates electricity indirectly from solar energy by harnessing the temperature difference between the sunwarmed surface of tropical oceans and the colder deep waters. Aug 24, 2009 1 august 24, 2009 ocean thermal energy conversion otec a new secure renewable energy source for defense and commercial applications. Technical readiness of ocean thermal energy conversion. Ocean thermal energy conversion systems convert the energy available in the temperature gradient of the warm surface. Ocean thermal energy conversion makai ocean engineering.

There have been several investigations in the past which focused on standalone otec systems. Otec transfer function the relationship between the thermal resource and the electricity generated. Ocean thermal energy conversion research, development, and demonstration act 42 u. There are two approaches one referred to as closed cycle and the other as open cycle. Otec is not like wind power or solar power which are intermittent, because the technology can operate on a 247 basis.

Ocean thermal energy conversion using doublestage rankine cycle. While pilot scale plants ocean thermal energy conversion otec demonstration facility. Ocean thermal energy conversion otec is a technology that dates back to the late 1800s and makes use of temperature differences between surface and deep ocean waters to drive a heat engine, and extract energy via the rankine cycle. Ocean thermal energy conversion technology britannica. Ocean thermal energy conversion karen anne finney university of guelph, guelph, ontario, n1g 2w1, canada ocean thermal energy conversion otec is a process that employs the natural temperature difference between the surface and the depths of the ocean.

Mar 10, 2015 ocean thermal energy seminar and ppt with pdf report. The sun shines on the oceans of the world and in the hot parts near the water at the seas surface can be quite warm, sometimes as high as 30c. Pdf the ocean thermal energy conversion strategies and. Sea thermal energy conversion otec is a vitality innovation that changes over sun oriented radiation to electric force. Energy from the sun heats the surface water of the. The heat stored in the ocean can be converted into electricity by means of a process called ocean thermal energy conversion otec, which uses the oceans natural temperature gradient to drive a turbine connected to a generator which produces electricity. Ocean thermal energy conversion otec systems are based on utilizing the temperature difference between the warm surface water around 27.

Otec frameworks utilize the seas regular warm slopethe way that the seas layers of water have distinctive. Plantship a ship designed to house an otec power plant. Otec ocean thermal energy conversion principle your. At one point, we all have to make ppt of any topic and submit its report. Ammonia will be used as the working fluid in this cycle. Thus, firms that provide ocean thermal energy do not have to seek alternative methods of electricity generation.

Ocean thermal energy conversion otec is a promising renewable energy technology to generate electricity and has other applications such as production of freshwater, seawater airconditioning, marine culture and chilledsoil agriculture. Ocean thermal energy conversion otec, which uses the oceans. Ocean thermal energy conversion otec is a way of getting useful energy from the worlds oceans. The heat stored in the ocean can be converted into electricity by means of a process called.

Paul rappaport for his encouragement during the initial stages of this work. The working fluid in such a cycle will need to have a low boiling point. The difference in temperature between the surface and the lower water layer can be as large as 50. In depth study about ocean thermal energy conversion systems. The generated electrical power and the efficiency of otec plant are enhanced by a simulation of a number of derived formulas. The warm seawater vaporizes the fluid in the heat exchanger which then turns the turbines of the. Ocean temperature differences, ocean thermal energy conversion, otec, renewable energy. Ocean thermal energy conversion, or otec, uses seawater to turn solar energy into electricity. Ocean thermal energy conversion otec types renewable energy.

Ocean surface water that is heated by solar energy then stored in the earths oceans is evaporated and used to spin a turbine in a. An ocean thermal energy conversion otec is a system of converting thermal energy in electricity by using the temperature difference between warm water at the surface of the ocean and cold water. Solar energy or energy from the sun is contained in. Otc 21016 economics of ocean thermal energy conversion otec. It removes the dissolved noncondensable gases from water and fed it to the evaporator. Actual ocean thermal energy conversion efficiency at any location is likely to be around 3 %. Ocean thermal energy conversion otec is a clean marine renewable energy using temperature difference between the sea surface and the deep ocean to rotate a generator to produce electrical energy. Sumit thakur mechanical ocean thermal energy seminar and ppt with pdf report. Journal of mechatronics, electrical power, and vehicular. Oceans act as incredibly large solar energy collectors, absorbing about 80% of the suns energy. This means that every day, the oceans on our planet absorb solar energy equivalent to 250 billion barrels of oil, and if we could convert 0. The ocean thermal energy conversion strategies and analysis of current challenges conference paper pdf available september 2007 with 2,763 reads how we measure reads.

Ocean thermal energy conversion otec generates electricity indirectly from solar energy by harnessing the temperature difference between the sunwarmed. This is because this form of energy generation may not have low seasons unlike solar and wind power which may face low. Parsons august 1984 to be presented at the asme winter meeting new orleans, louisiana 9 14 december 1984 prepared under task no. It is one of the renewable energy resources that do not arise any indeed harmful impact on our environment. Ocean thermal energy conversion an overview sciencedirect. Cost effective otec ocean thermal energy conversion. Pdf ocean thermal energy conversion otec ajer research academia. Predictable and continuous, the energy produced in this way is particularly environmentally friendly and decarbonised. Technical readiness of ocean thermal energy conversion otec. The stored thermal energy in the top meter depth is more than two years of delivered solar energy, at 100 % conversion efficiency, the stored energy is sufficient for 10,000 years of human use. In order to produce power with the low temperature range, a working fluid with low boiling point is used. The low energy conversion efrciency of otec means that more than 90% of the thermal energy extracted from the ocean s surface is wasted and must be rejected to the cold, deep sea water. Otec plants pump large quantities of deep cold seawater and surface seawater to run a power cycle and produce electricity. C and the cold, meter deep bottom water at around 5.

For otec ocean thermal energy conversion, rather than transfer huge quantities of cold water from deep in the ocean to the surface to provide a heat sink for a heat engine or for desalination, this invention provides a method of using small masses of lowboilingpoint fluids to absorb heat in a heat exchanger near the ocean surface using the latent heat of evaporation and then. Process and technology status ocean thermal energy conversion. Closed cycle ocean thermal energy conversion systems use a working fluid with a low boiling point, ammonia for example, and use it to power a turbine to generate electricity. First introduced in 1881, otec has been described as an effective and renewable energy source. He taught a graduate course on renewable energy at hiroshima university in 1996 and 1997. Renewable energy ocean thermal energy conversion otec small island developing states sidss abstract increasing concerns regarding oil spills, air pollution, and climate change associated with fossil fuel use have increased the urgency of the search for renewable, clean sources of energy. And getting a right seminar for submission is really a tough task. 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. Pdf a closed cycle ocean thermal energy conversion basically involves a working fluid which has a boiling point just low below ambient. The sun warms the surface water and wave motion mixes it to the downward from the deep cold water, formed at high latitudes, by a thermocline. Principle and preliminary calculation of ocean thermal energy. Join us in exploring this exciting path into the future.