Gerald Thomas Heydt. Ocean thermal energy conversion OTEC is a process that employs the temperature difference between surface and deep ocean water to alternately evaporate and condense a working fluid. In the open-cycle OTEC configuration, the working fluid is seawater. In the closed-cycle configuration, a working fluid such as propane is used. In this paper, OTEC is assessed for its practical merits for electric power generation. The process is not new—and its history is reviewed.
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The design space for long-duration energy storage in decarbonized power systems | Nature Energy
Large amounts of deep cold seawater and warm surface seawater are pumped to run a power cycle to produce electricity. A heat exchanger evaporator generates steam by vapourising an ammonia fluid with warm surface seawater to drive a turbine generator for producing electricity. Once the steam transfers its energy, a heat exchanger condenser cools the ammonia vapour, turns it back into a liquid and conveys it to a heat exchanger evaporator to repeat the cycle. The OREC is capable of testing six heat exchangers simultaneously and also conducts research programmes on seawater air-conditioning SWAC , corrosion prevention and heat exchangers for other marine applications. The heat exchanger research facility is necessary as the components are estimated to make up approximately one-third of the overall cost in developing a commercial OTEC plant, primarily suited for offshore locations. In , the research centre completed the test of seven heat exchangers that are constructed of either aluminium or titanium.
The design space for long-duration energy storage in decarbonized power systems
Abstract With considering the increasing of global temperature, and also the concern of global climate change, many policy makers worldwide have been accepted the importance of reducing greenhouse gas emissions, in particular from the power industries. Energy resource use is one of the most important and Contentious issues of our time. The ocean provides a vast source of potential energy resources.
Ocean thermal energy conversion OTEC is a form of solar energy that can produce electricity on a non-intermittent basis. In this paper, a regionally disaggregated global energy system model with a detailed treatment of the electricity supply sector is used to examine the competitiveness of OTEC technologies for each of 48 world regions over the period to under a constraint of halving global energy-related CO 2 emissions in compared to the level. It is then shown that by-products from OTEC technologies could significantly enhance their cost competitiveness in the global electricity generation sector. Request Permissions. Buigues, I.