Design and Analysis of a Novel Integrated Wind-Solar-OTEC Energy System for Producing Hydrogen, Electricity, and Fresh Water

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Haris Ishaq ◽  
Osamah Siddiqui ◽  
Ibrahim Dincer
Keyword(s):  
Hydrogen Production ◽  
Fresh Water ◽  
Energy System ◽  
Energetic Efficiency ◽  
Production Cycle ◽  
Energy And Exergy ◽  
New Energy ◽  
Parametric Studies ◽  
Ocean Thermal Energy ◽  
Power Generation Cycle

A new energy system for power, hydrogen and fresh water production is proposed. The environmentally benign ocean thermal energy conversion (OTEC), wind and solar energy resources are utilized. The hybrid thermochemical CuCl cycle is used for hydrogen production, and the reverse osmosis (RO) desalination system is incorporated for producing fresh water. The presently developed system is analyzed through thermodynamic energy and exergy approaches. The energetic efficiency of the integrated trigeneration system is determined to be 45.3%, and the exergetic efficiency is found to be 44.9%. In addition to this, the energy efficiency of the OTEC power generation cycle is 4.5% while the exergy efficiency is found to be 12.9%. Furthermore, the CuCl hydrogen production cycle is examined to have exergetic and energetic efficiencies of 36% and 35.2%, respectively. Also, numerous parametric studies are performed to analyze the system performance at different operating parameters.

scholarly journals Design Scheme of Block Smart Energy Internet System

2021 ◽  
Vol 252 ◽  
pp. 03034
Author(s):  
Li Guicun ◽  
Li Dejin
Keyword(s):  
Renewable Energy ◽  
Hydrogen Production ◽  
Energy Demand ◽  
Energy System ◽  
Development Trend ◽  
Energy Output ◽  
Energy Structure ◽  
Stable Operation ◽  
Energy Internet ◽  
New Energy

Traditional energy consumption is continuously decreasing, and new energy demand industries are continuously increasing. Full consumption of clean and renewable energy and efficient utilization of comprehensive energy will become the development trend of energy industry. The smart energy Internet based on the physical structure of the energy Internet is sweeping the world. Using smart and green to fundamentally change the existing energy structure and to adjust the structure dominated by fossil energy to a new energy structure dominated by renewable energy is of far-reaching significance to China’s energy transformation and upgrading in the future. This paper aims at the design idea of smart energy Internet rack for the newly-built ChengBi campus in Baise University, combines peak-valley electricity price and photovoltaic hydrogen production technology to stabilize the fluctuation of renewable energy output, and realizes the safe and stable operation of a comprehensive energy system of distributed photovoltaic power stations. A campus smart energy Internet system is formed by “wind power + photovoltaic + energy storage + charging pile + photovoltaic hydrogen production”.

scholarly journals Fiftieth Anniversary of the California Net Energy System Symposium: What are the energy coefficients for cows?1

2019 ◽  
Vol 3 (3) ◽  
pp. 969-975 ◽  
Author(s):  
Harvey C Freetly
Keyword(s):  
Energy Metabolism ◽  
Energy Use ◽  
Current Model ◽  
Energy System ◽  
Energy Utilization ◽  
Energetic Efficiency ◽  
Production Cycle ◽  
Net Energy ◽  
Support Functions ◽  
Animal Metabolism

Abstract The same model structure used to describe energy metabolism in the growing animal is often used to model energy metabolism in the cow. Energy requirements of the cow are modeled as the summation of energy required for maintenance and recovered energy, where recovered energy is the summation of energy for the conceptus, milk, and tissue energy. Energetic requirements of the cow fluctuate throughout the production cycle depending on whether they are pregnant, lactating, or both. The current model requires energy cost to be associated with either net energy of maintenance or the partial efficiencies of conceptus growth, milk production, and tissue energy change. Mathematically, they are not independent. Incorrectly estimating one will result in an erroneous estimate in the other. Most of the current models in production agriculture allocate energy use into maintenance, and synthesis of tissues making it difficult to assign energy utilization by tissues that provide support functions to pregnancy, lactation, and weight fluctuation. The consequence is the assignment of partial efficiencies that reflect whole animal efficiencies rather than tissue efficiencies. Historically, these models have been predictive of energy metabolism, but caution should be used when inferring the energetic efficiency at the tissue level. Alternative modeling approaches more thoroughly describe tissue energy metabolism and have been used to estimate whole animal metabolism. These models resolve the problems associated with developing coefficients that lack biological meaning but are more complex. There is a critical need for independent data sets to test new components of the model for cows.

Assessment and Evolutionary Based Multi-Objective Optimization of a Novel Renewable-Based Polygeneration Energy System

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Rami S. El-Emam ◽  
Ibrahim Dincer
Keyword(s):  
Fuel Cell ◽  
Energy System ◽  
Present System ◽  
Night Time ◽  
Optimization Analysis ◽  
Optimal Point ◽  
Energy And Exergy ◽  
Helium Gas ◽  
Integrated Energy System ◽  
Parametric Studies

In this paper, a renewable-based integrated energy system is developed, analyzed, and optimized to achieve better performance. The present system is designed to be driven by concentrated solar thermal and biomass energies. Biomass fuel is used as the backup source of energy when the solar energy is not available. The system is designed to produce electricity, cooling, and hydrogen. The power output of the system is provided by solar-driven regenerative helium gas turbine during day time and from biomass gasification driven solid oxide fuel cell (SOFC) unit at night time. The fuel cell stack number is estimated as to provide the same net power. The system operates at energy and exergy efficiencies of 39.99% and 27.47%, respectively, at the optimal point selected based on the optimization analysis. The parametric studies on performance and environmental impact assessment are performed to investigate the effects of several operating parameters on the system performance.

The Importance Of Energy Solutions For A Safe And Rational Development

2014 ◽  
Vol 1 (1) ◽  
pp. 379-384
Author(s):  
Daniela Cristina Momete ◽  
Tudor Prisecaru
Keyword(s):  
Industrial Revolution ◽  
New Technology ◽  
Energy System ◽  
Crucial Importance ◽  
Gas Processing ◽  
Energy Technologies ◽  
Rational Development ◽  
Oil Exploitation ◽  
New Energy ◽  
Energy Domain

AbstractA new industrial revolution is on the verge in the energy domain considering the knowledge and skills acquired through the development of new energy technologies. Shale gas processing, unconventional oil exploitation, new exploring/drilling methods, mature renewable energy or in progress, all generated a wealth of knowledge in new technology. Therefore, this paper aims to analyse the positive and negative aspects of energy solutions, and to reveal the way to a world where a valid sustainable development, based on safe and rational premises, is actually considered. The paper also introduces suggestions for the energy system, which has a crucial importance in coping with the resource management of the future, where the economic, social, and environmental/climate needs of the post-crisis world should be suitably considered.

scholarly journals Electrochemical Hydrogen Production Powered by PV/CSP Hybrid Power Plants: A Modelling Approach for Cost Optimal System Design

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3437
Author(s):  
Andreas Rosenstiel ◽  
Nathalie Monnerie ◽  
Jürgen Dersch ◽  
Martin Roeb ◽  
Robert Pitz-Paal ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Power Plants ◽  
Large Scale ◽  
Energy System ◽  
Solar Hydrogen ◽  
Energy System Model ◽  
Optimal System Design ◽  
Solar Hydrogen Production ◽  
Electrochemical Water Splitting ◽  
Climate Neutrality

Global trade of green hydrogen will probably become a vital factor in reaching climate neutrality. The sunbelt of the Earth has a great potential for large-scale hydrogen production. One promising pathway to solar hydrogen is to use economically priced electricity from photovoltaics (PV) for electrochemical water splitting. However, storing electricity with batteries is still expensive and without storage only a small operating capacity of electrolyser systems can be reached. Combining PV with concentrated solar power (CSP) and thermal energy storage (TES) seems a good pathway to reach more electrolyser full load hours and thereby lower levelized costs of hydrogen (LCOH). This work introduces an energy system model for finding cost-optimal designs of such PV/CSP hybrid hydrogen production plants based on a global optimization algorithm. The model includes an operational strategy which improves the interplay between PV and CSP part, allowing also to store PV surplus electricity as heat. An exemplary study for stand-alone hydrogen production with an alkaline electrolyser (AEL) system is carried out. Three different locations with different solar resources are considered, regarding the total installed costs (TIC) to obtain realistic LCOH values. The study shows that a combination of PV and CSP is an auspicious concept for large-scale solar hydrogen production, leading to lower costs than using one of the technologies on its own. For today’s PV and CSP costs, minimum levelized costs of hydrogen of 4.04 USD/kg were determined for a plant located in Ouarzazate (Morocco). Considering the foreseen decrease in PV and CSP costs until 2030, cuts the LCOH to 3.09 USD/kg while still a combination of PV and CSP is the most economic system.

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