scholarly journals A comparative analysis on the impact of salinity on the heat generation of OTEC plants to determine the most plausible geographical location

2018 ◽  
Vol 5 ◽  
pp. 119-130 ◽  
Author(s):  
Bradley Lynn ◽  
Alexander Medved ◽  
Timothy Griggs
Keyword(s):  
Comparative Analysis ◽  
Power Plants ◽  
Sea Water ◽  
Negative Impact ◽  
Geographical Location ◽  
Pooled Data ◽  
Thermal Energy Conversion ◽  
Ocean Thermal Energy ◽  
The Tropics ◽  
The Impact

This meta-study aims to analyse how the salinity and temperature gradient of the ocean influences the efficiency of ocean-based power plants utilising Ocean Thermal Energy Conversion (OTEC) systems to recommend optimal geographical locations. A comparative analysis of relevant and up to date literature was conducted with pooled data collected by other researchers and utilised such that reasonable conclusions were drawn on how the factors above impact the efficiency of the system. Through the comparisons of the different outputs of the various operational OTEC facilities, it was concluded that seawater with a higher salinity has a negative impact on the heat generated by the OTEC system. By decreasing the salinity by 10% the heat generated increased by up to 0.4%. This information conveys that ideal locations for OTEC power generation lie within the tropics, in regions with lower sea-water salinity. These findings could positively impact the power output of future OTEC plants and highlight the potential for new sources of renewable energies for coastal regions.

scholarly journals Determine the best location for Ocean Thermal Energy Conversion (OTEC) in Iranian Seas

2016 ◽  
Vol 10 (5) ◽  
pp. 32 ◽  
Author(s):  
Ashrafoalsadat Shekarbaghani
Keyword(s):  
Energy Conversion ◽  
Thermal Energy ◽  
Caspian Sea ◽  
Power Plants ◽  
Sea Water ◽  
Working Fluid ◽  
The South ◽  
Ocean Thermal Energy Conversion ◽  
Thermal Energy Conversion ◽  
Ocean Thermal Energy

Two-thirds of the earth's surface is covered by oceans. These bodies of water are vast reservoirs of renewable energy.<strong> </strong>Ocean Thermal Energy Conversion technology, known as OTEC, uses the ocean’s natural thermal gradient to generate power. In geographical areas with warm surface water and cold deep water, the temperature difference can be leveraged to drive a steam cycle that turns a turbine and produces power. Warm surface sea water passes through a heat exchanger, vaporizing a low boiling point working fluid to drive a turbine generator, producing electricity. OTEC power plants exploit the difference in temperature between warm surface waters heated by the sun and colder waters found at ocean depths to generate electricity. This process can serve as a base load power generation system that produces a significant amount of renewable, non-polluting power, available 24 hours a day, seven days a week. In this paper investigated the potential of capturing electricity from water thermal energy in Iranian seas (Caspian Sea, Persian Gulf and Oman Sea). According to the investigated parameters of OTEC in case study areas, the most suitable point in Caspian Sea for capturing the heat energy of water is the south part of it which is in the neighborhood of Iran and the most suitable point in the south water of Iran, is the Chahbahar port.

scholarly journals Comparative analysis of the impact of objects of traditional and alternative energy on the environment

2021 ◽  
pp. 58-63
Author(s):  
Yuliya S. Borisova ◽  
Nataliya S. Samarskaya
Keyword(s):  
Comparative Analysis ◽  
Power Plant ◽  
Wind Power ◽  
Alternative Energy ◽  
Power Plants ◽  
Negative Impact ◽  
Thermal Power ◽  
Energy Sources ◽  
Wind Power Plant ◽  
The Impact

Introduction. Active withdrawal of energy raw materials from the subsoil, as well as technogenic impact from energy sources based on traditional fuel, lead to irreversible environmental consequences. To minimize this impact, it is necessary to start from two main conditions: the search for alternative energy sources and the improvement of the existing ones. Problem Statement. The objective of this study is a comparative analysis of energy facilities in order to identify the plant that has the greatest negative impact on the environment. Theoretical part. The comparative analysis of various energy production systems reflects the ecological and economic components of each. For example, a thermal power plant (TPP), a nuclear power plant (NPP) and a wind power plant (WPP) are considered. The negative impact on the environment is mainly exerted on the atmospheric air, in connection with which the data on the amount of pollutants are considered. Also, a modified Leopold matrix was constructed for an expert assessment of the mentioned stations. Conclusions. The results of the analysis show that among the considered power plants, the wind power plant is the most environmentally friendly and favorable for the health of the population.

Optimization of a Closed-Cycle OTEC System

1990 ◽  
Vol 112 (4) ◽  
pp. 247-256 ◽  
Author(s):  
Haruo Uehara ◽  
Yasuyuki Ikegami
Keyword(s):  
Heat Exchangers ◽  
Sea Water ◽  
Working Fluid ◽  
Turbine Efficiency ◽  
Thermal Energy Conversion ◽  
Calculation Results ◽  
Change Temperature ◽  
Ocean Thermal Energy ◽  
Powell Method ◽  
Method Of Steepest Descent

Optimization of an Ocean Thermal Energy Conversion (OTEC) system is carried out by the Powell Method (the method of steepest descent). The parameters in the objective function consist of the velocities of cold sea water and warm sea water passing through the heat exchangers, the phase change temperature, and turbine configuration (specific speed, specific diameter, ratio of blade to diameter). Numerical results are shown for a 100-MW OTEC plant with plate-type heat exchangers using ammonia as working fluid, and are compared with calculation results for the case when the turbine efficiency is fixed.

Experimental Studies on the Seawater Desalination System Based on Ocean Thermal Energy Conversion

2013 ◽  
Vol 448-453 ◽  
pp. 3254-3258
Author(s):  
Feng Yun Chen ◽  
Wei Min Liu ◽  
Liang Zhang
Keyword(s):  
Heat Exchanger ◽  
Energy Conversion ◽  
Thermal Energy ◽  
Sea Water ◽  
Economic Benefits ◽  
Seawater Desalination ◽  
Tube Heat Exchanger ◽  
Ocean Thermal Energy Conversion ◽  
Thermal Energy Conversion ◽  
Ocean Thermal Energy

Seawater desalination system has been established based on the ocean thermal energy conversion in this paper. Through compared finned tube heat exchanger with round tube heat exchanger obtained the fresh water output at different temperature and flow velocity of the warm and cold sea water. In this system the energy of the warm and cold sea water has been fully utilized, and so improved the economic benefits of the ocean thermal energy conversion.

A Comparative Analysis of Drivers of Secondary Market Liquidity in Financial Markets for Investment Analysis

2019 ◽  
pp. 340-366
Author(s):  
Hakki Karatas ◽  
Nildag Basak Ceylan ◽  
Ayhan Kapusuzoglu
Keyword(s):  
Comparative Analysis ◽  
Stock Markets ◽  
Global Financial Crisis ◽  
Negative Impact ◽  
Bond Market ◽  
Secondary Market ◽  
Market Liquidity ◽  
Investment Analysis ◽  
Secondary Bond ◽  
The Impact

The purpose of this chapter is to examine the drivers of secondary bond market and stock market liquidity for investment analysis after global financial crisis in Turkey. The literature in Turkey mainly focuses only on the volatility of return for driving liquidity in both bond and stock markets. However, it is argued that other types of volatilities including domestic and international volatilities have also a deteriorating impact on secondary market liquidity in Turkey. In this context, it is empirically tested whether the volatility and/or uncertainty that stem from the FED and ECB policies within the last 10 years had a negative impact on liquidity both in government bond and stock markets. Moreover, the impact of non-residents in bond and stock markets on secondary market liquidity is examined by including their holdings in stock and bond market.

scholarly journals Control the System and Environment of Post-Production Wind Turbine Blade Waste Using Life Cycle Models. Part 1. Environmental Transformation Models

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1828 ◽  
Author(s):  
Izabela Piasecka ◽  
Patrycja Bałdowska-Witos ◽  
Józef Flizikowski ◽  
Katarzyna Piotrowska ◽  
Andrzej Tomporowski
Keyword(s):  
Life Cycle ◽  
Power Plant ◽  
Wind Power ◽  
Power Plants ◽  
Negative Impact ◽  
Polymer Materials ◽  
Wind Power Plant ◽  
Polymer Waste ◽  
Wind Power Plants ◽  
The Impact

Controlling the system—the environment of power plants is called such a transformation—their material, energy and information inputs in time, which will ensure that the purpose of the operation of this system or the state of the environment, is achieved. The transformations of systems and environmental inputs and their goals describe the different models, e.g., LCA model groups and methods. When converting wind kinetic energy into electricity, wind power plants emit literally no harmful substances into the environment. However, the production and postuse management stages of their components require large amounts of energy and materials. The biggest controlling problem during postuse management is wind power plant blades, followed by waste generated during their production. Therefore, this publication is aimed at carrying out an ecological, technical and energetical transformation analysis of selected postproduction waste of wind power plant blades based on the LCA models and methods. The research object of control was eight different types of postproduction waste (fiberglass mat, roving fabric, resin discs, distribution hoses, spiral hoses with resin, vacuum bag film, infusion materials residues, surplus mater), mainly made of polymer materials, making it difficult for postuse management and dangerous for the environment. Three groups of models and methods were used: Eco-indicator 99, IPCC and CED. The impact of analysis objects on human health, ecosystem quality and resources was controlled and assessed. Of all the tested waste, the life cycle of resin discs made of epoxy resin was characterized by the highest level of harmful technology impact on the environment and the highest energy consumption. Postuse control and management in the form of recycling would reduce the negative impact on the environment of the tested waste (in the perspective of their entire life cycle). Based on the results obtained, guidelines and models for the proecological postuse control of postproduction polymer waste of wind power plants blades were proposed.

scholarly journals Тoxicity of exhaust gasessolid fuel boiler KE-25-14S

2020 ◽  
Vol 22 (1) ◽  
pp. 77-84
Author(s):  
M. S. Ivanitskiy
Keyword(s):  
Power Plants ◽  
Negative Impact ◽  
Thermal Power ◽  
Hazard Index ◽  
Combustion Products ◽  
State Regulation ◽  
Best Available Technologies ◽  
The Impact ◽  
National Environmental ◽  
Practical Recommendations

The article deals with the implementation of the new national environmental legislation, which provides for the division of all energy enterprises into 4 categories depending on the degree of negative impact on the environment, the introduction of technological rationing, implemented on the principles of the best available technologies, provided that they are technically possible to use them, and the differentiation of state regulation measures in the field of environmental protection. Within the framework of this approach, the values of the total index of harmfulness (toxicity) of combustion products formed during the burning of Berezovsky coal of the B2 grade (enrichment class P) were determined by numerical experiments in order to assess the impact on the environment of emissions from low-power boilers KE-25-14C. The total emission hazard index is determined by taking into account the contribution of specific hazard indicators of combustion components represented by nitrogen oxides, sulfur dioxide, carbon monoxide, ash particles, vanadium pentaoxide and benz(a)pyrene. The private contribution of the considered pollutants to the total toxicity of emissions in the implementation of combustion regimes with moderate and large chemical underburning of fuel is established. Practical recommendations are given for using the results of the study as input data for setting technological standards for boilers of thermal power plants in the process of approval and obtaining a comprehensive environmental permit, and for developing a program to improve the environmental efficiency of energy enterprises.

Spillover Effects of Status Demotion on Customer Reactions to Loyalty Reward Promotions: The Role of Need for Status and Exclusivity

2018 ◽  
Vol 58 (8) ◽  
pp. 1302-1316 ◽  
Author(s):  
YooHee Hwang ◽  
Anna S. Mattila
Keyword(s):  
Negative Impact ◽  
Negative Emotions ◽  
Geographical Location ◽  
Spillover Effects ◽  
Joint Effect ◽  
Travel And Tourism ◽  
Status Seeking ◽  
Reward Program ◽  
The Impact

Prior research demonstrates that status demotion in the loyalty reward program heightens negative emotions, particularly when demotion is due to changes in company policies. In this research, we argue that such negative emotions are likely to spillover to evaluations of post-demotion promotions. We further argue that such spillover effects should be attenuated among individuals high in need for status. Study 1 examines the joint effect of the cause of demotion and customers’ need for status on loyalty. In study 2, we investigate the impact of exclusivity cues in post-demotion promotions and show that exclusive promotions diminish the negative impact of policy-based demotions on post-promotion loyalty among individuals high (vs. low) in need for status. Travel and tourism companies might want to consider using geographical location as a proxy for need for status or priming status-seeking via exclusive promotions (“elevate your travel experience”) to alleviate demoted customers’ negative emotions.

The Indian 1 MW Demonstration OTEC Plant and the Pre-Commissioning Tests

2002 ◽  
Vol 36 (4) ◽  
pp. 36-41 ◽  
Author(s):  
M. Ravindran ◽  
Raju Abraham
Keyword(s):  
Power Plants ◽  
Fossil Fuels ◽  
Heat Engine ◽  
Design Development ◽  
Analysis Model ◽  
Power Cycle ◽  
Model Studies ◽  
Thermal Energy Conversion ◽  
Ocean Thermal Energy ◽  
Basic Power

Ocean Thermal Energy Conversion (OTEC) utilizes the thermal gradient available in the ocean to operate a heat engine to produce work output. Even though the concept is simple and old for almost one century, recently it has gained momentum due to worldwide search for clean continuous energy sources to replace the fossil fuels. There are technological hurdles to overcome to tap the immense potential of OTEC. But still the technology is mature enough to establish commercial power plants. National Institute of Ocean Technology was involved in the design, development and demonstration of a 1 MW OTEC floating plant-the largest of its kind-in the Indian waters. This is to be commissioned 60 km south east of Tuticorin, South India where an ocean depth of 1200m available. The site surveys, computer analysis, model studies were done in 1999. The basic power cycle design Was completed within 4 months. The plant was integrated and stage qualification tests were carried out in 2000-02. The project is to be commissioned in January 2003. This paper is projecting the technological and economical aspects of the OTEC with an overview of the various pre-commissioning activities of the project.

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