scholarly journals Classification of geothermal resources by potential

2015 ◽  
Vol 3 (1) ◽  
pp. 13-17 ◽  
Author(s):  
L. Rybach
Keyword(s):  
Energy Resources ◽  
Economic Potential ◽  
Renewable Energy Resources ◽  
Geothermal Resources ◽  
Economic Resource ◽  
Geothermal Potential ◽  
Technical Potential ◽  
Available Technology

<p><strong>Abstract.</strong> When considering and reporting resources, the term "geothermal potential" is often used without clearly stating what kind of potential is meant. For renewable energy resources it is nowadays common to use different potentials: theoretical, technical, economic, sustainable, developable – decreasing successively in size. In such a sequence, the potentials are progressively realizable and more and more rewarding financially. The theoretical potential describes the physically present energy, the technical potential the fraction of this energy that can be used by currently available technology and the economic potential the time- and location-dependent fraction of the previous category; the sustainable potential constrains the fraction of the economic potential that can be utilized in the long term; the developable potential is the fraction of the economic resource which can be developed under realistic conditions. In converting theoretical to technical potential, the recovery factor (the ratio extractable heat/heat present at depth) is of key importance. An example (global geothermal resources) is given, with numerical values of the various potentials. The proposed classification could and should be used as a kind of general template for future geothermal energy resources reporting.</p>

Climate change effects on marine renewable energy resources and environmental conditions for offshore aquaculture in Europe

2020 ◽  
Author(s):  
Carlos V C Weiss ◽  
Melisa Menendez ◽  
Bárbara Ondiviela ◽  
Raúl Guanche ◽  
Iñigo J Losada ◽  
...  
Keyword(s):  
Climate Change ◽  
Renewable Energy ◽  
Environmental Conditions ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Energy Potential ◽  
Holistic View ◽  
Marine Renewable Energy ◽  
Offshore Aquaculture

Abstract The development of the marine renewable energy and offshore aquaculture sectors is susceptible to being affected by climate change. Consequently, for the long-term planning of these activities, a holistic view on the effects of climate change on energy resources and environmental conditions is required. Based on present climate and future climate scenario, favourable conditions for wind and wave energy exploitation and for farming six marine fish species are assessed using a suitability index over all European regional seas. Regarding available energy potential, the estimated changes in climate do not have direct impacts on the geographic distribution of potential regions for the energy industry (both wind and wave based), that is they pose no threat to this industry. Long-term changes in environmental conditions could however require adaptation of the aquaculture sector and especially of its exploitation areas. Opportunities for aquaculture expansion of the assessed species are identified. Possibilities for co-location of these activities are observed in the different climate scenarios. The evaluation of potential zones for the exploitation of marine renewable energy resources and offshore aquaculture represents a stepping-stone, useful for improving decision-making and assisting in the management of marine economies both in the short-term and in the long-term development of these sectors.

Geothermal resources characterization of two areas in southern Tuscany

2020 ◽  
Author(s):  
Eugenio Trumpy ◽  
Gianluca Gola ◽  
Alessandro Santilano ◽  
Adele Manzella ◽  
Matteo Brambilla ◽  
...  
Keyword(s):  
Dynamic Models ◽  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Geothermal Field ◽  
Joint Analysis ◽  
Geothermal Resources ◽  
Flow Measurements ◽  
North East ◽  
Geothermal Potential ◽  
Technical Potential

&lt;p&gt;Based on a joint analysis of geothermal indicators (e.g. temperature map at different depth, surface heat flux) and practical features (e.g. restricted areas, existing research lease), two promising areas in southern Tuscany were identified to perform a more detailed geothermal resource characterization. An area is located on the north-east of the Larderello-Travale geothermal field, and the other one is located on the west of the Mt. Amiata geothermal field.&lt;/p&gt;&lt;p&gt;A quantitative geothermal resources assessment was performed in the aforementioned areas of Tuscany by solving numerical thermo-fluid dynamic models and by computing the geothermal potential using the &amp;#8216;ThermoGIS&amp;#8217; software, as further developed for the Italian case (Trumpy et al., 2016).&lt;/p&gt;&lt;p&gt;First of all, geological and geophysical data required for geological and thermo-fluid dynamic modelling were collected and organised. The geological data were used to build a 3D geological model of the two areas of interest suitable for numerical simulations. Static temperature data gathered from the Italian National Geothermal Database together with site-specific heat flow measurements were used to calibrate the simulated steady state temperature distribution.&lt;/p&gt;&lt;p&gt;The geothermal potential computed by integrating geological, thermal and petro-physical information implementing the volume method used in ThermoGIS provided estimates of the heat in place and the geothermal technical potential maps. The resulting technical potential in the area close to Larderello &amp;#8211;Travale is 330 MW&lt;sub&gt;e&lt;/sub&gt; and in the Mt. Amiata sector is 50MW&lt;sub&gt;e&lt;/sub&gt;.&lt;/p&gt;&lt;p&gt;References&lt;/p&gt;&lt;p&gt;Trumpy E., Botteghi S., Caiozzi F., Donato A., Gola G., Montanari D., Pluymaekers M., Santilano A., Van Wees, J.D., Manzella A. Geothermal potential assessment for a low carbon strategy: a new systematic approach applied in southern Italy. Energy 103, 167-181, 2016.&lt;/p&gt;

Trend analysis of Icelandic discharge, precipitation and temperature series

2006 ◽  
Vol 37 (4-5) ◽  
pp. 365-376 ◽  
Author(s):  
Jóna Finndís Jónsdóttir ◽  
Páll Jónsson ◽  
Cintia B. Uvo
Keyword(s):  
Time Series ◽  
Kendall Test ◽  
Temperature Series ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Energy Research ◽  
Daily Discharge ◽  
Spring Temperatures ◽  
The Impact

This study is a part of a Nordic co-operative research project, Climate and Energy, funded by Nordic Energy Research and the Nordic energy sector. The project has the objective of a comprehensive assessment of the impact of climate change on Nordic renewable energy resources including hydropower, wind power, biofuels and solar energy. In this paper, the long term variability of precipitation, temperature and discharge of Icelandic rivers is analyzed with respect to trends. Trend is tested for two periods: 1941–2002, since the longest Icelandic discharge records reach 60 years back in time, and 1961–2000, so that a larger set of discharge records could be included, as only a few Icelandic discharge records extend more than 40 years back in time. An eventual trend in the time series is analyzed using the Mann–Kendall test. The test is applied to the time series of both annual and seasonal values, and also to the timing and volume of the maximum daily discharge in spring and autumn, respectively. The main conclusions from the study are that, despite significant increase in measured precipitation, discharge in non-glacial rivers has not increased. Meanwhile, spring temperatures have a negative trend and spring floods, therefore, are larger and delayed.

scholarly journals A 100% Renewable Energy Scenario for the Java-Bali Grid

2018 ◽  
Vol 7 (1) ◽  
pp. 13 ◽  
Author(s):  
Matthias Guenther
Keyword(s):  
Renewable Energy ◽  
Energy Supply ◽  
Storage Capacity ◽  
Supply System ◽  
Energy Resources ◽  
Electricity Supply ◽  
Renewable Energy Resources ◽  
Energy Potential ◽  
Term Storage

Currently, many countries try to satisfy their energy needs with an increasing usage of renewable resources. The general motivations, with varying weighting in the different countries, are ecological reasons, concerns about energy security, and economical considerations. A for now rather theoretical question, although interesting for opening a long-term perspective, is how an energy supply from exclusively renewable energy resources could look like. This question has to be answered individually for any specific energy supply system. The present paper has the objective to present and evaluate a scenario for an electricity supply only from renewable energy resources for the Java-Bali grid. After designing a load time series for the year 2050 for the Java-Bali grid, a scenario is developed how to cover the load with electricity from renewable energy resources alone. Assumptions about the usable energy sources are made as well as assumptions about the available power plant capacity or energy potential. A specific challenge is the fact that solar energy must be the main source in such a renewable-energy based system, which comes with the need for a large storage capacity to match the power supply at any time with the load. Several possibilities are presented how to bring down the storage capacity: the increment of the installed PV capacity, the usage of bioenergy for seasonal balancing, and the complementation of the proposed short-term storage with an additional long-term storage. The study shows some of the specific challenges that a gradual transformation of the current electricity supply system on Java and Bali into a renewable-energy-based one would face and gives some hints about how to cope with these challenges. Scenarios like the one designed in this study are an important tool for decision-makers who face the task to scrutinize the consequences of choosing between different development paths. Article History: Received: August 15th 2017; Received: October 18th 2017; Accepted: January 14th 2018; Available onlineHow to Cite This Article: Günther, M., Ganal, I. and Bofinger, S. (2018) A 100% Renewable Electricity Scenario for the Java-Bali Grid. Int. Journal of Renewable Energy Development, 7(1), 13-22.https://doi.org/10.14710/ijred.7.1.13-22

scholarly journals New methods of geothermal potential assessment in the Pannonian basin

2019 ◽  
Vol 98 ◽  
Author(s):  
Annamária Nádor ◽  
László Sebess-Zilahi ◽  
Ágnes Rotár-Szalkai ◽  
Ágnes Gulyás ◽  
Tamara Markovic
Keyword(s):  
Pannonian Basin ◽  
Pore Space ◽  
Heat Content ◽  
Geothermal Resources ◽  
Geothermal Potential ◽  
Technical Potential ◽  
Long Time ◽  
Geothermal Model ◽  
Bounding Surfaces ◽  
Direct Use

Abstract The Pannonian basin in Central Europe is well known for its rich geothermal resources. Although geothermal energy has been utilised, mainly for direct use purposes, for a long time, there are still a lot of untapped resources. This paper presents novel methods for outlining and assessing the theoretical and technical potential of partly still unknown geothermal reservoirs, based on a case study from the Dráva basin, one of the sub-basins of the Pannonian basin along the Hungarian–Croatian border. The presented methods include reservoir delineation based on combining geological bounding surfaces of the Upper Pannonian basin-fill units with a set of isotherms deriving from a conductive geothermal model. The geothermal potential of each identified reservoir was calculated by a Monte Carlo method, which was considered as being represented by the heat content of the fluids stored in the effective pore space (‘moveable fluid’). The results underline the great untapped geothermal potential of the Dráva basin, especially that of the reservoir storing thermal water of 50–75°C, which has the largest volume and the greatest stored heat content.

scholarly journals Indonesia’s Vast Solar Energy Potential

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5424
Author(s):  
David Firnando Silalahi ◽  
Andrew Blakers ◽  
Matthew Stocks ◽  
Bin Lu ◽  
Cheng Cheng ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Electricity Consumption ◽  
Energy Resources ◽  
Solar Photovoltaic ◽  
Economic Potential ◽  
Solar Pv ◽  
Renewable Energy Resources ◽  
Energy Potential ◽  
Energy Needs ◽  
Strong Winds

In this paper, we conclude that Indonesia has vast potential for generating and balancing solar photovoltaic (PV) energy to meet future energy needs at a competitive cost. We systematically analyse renewable energy potential in Indonesia. Solar PV is identified to be an energy source whose technical, environmental and economic potential far exceeds Indonesia’s present and future energy requirements and is far larger than all other renewable energy resources combined. We estimate that electricity consumption in Indonesia could reach 9000 terawatt-hours per year by 2050, which is 30 times larger than at present. Indonesia has abundant space to deploy enough solar to meet this requirement, including on rooftops, inland reservoirs, mining wasteland, and in combination with agriculture. Importantly, Indonesia has a vast maritime area that almost never experiences strong winds or large waves that could host floating solar capable of generating >200,000 terawatt-hours per year. Indonesia also has far more off-river pumped hydro energy storage potential than required for balancing solar generation.

scholarly journals Investigation of the Current Energy Sector in Jordan: Energy Strategy, Resources and Regulatory Framework

2015 ◽  
Vol 12 (2) ◽  
Keyword(s):  
Renewable Energy ◽  
Energy Sector ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Energy Field ◽  
Negative Effect ◽  
Current Energy ◽  
Future Plans

Due to the increase in demand for energy resources and the effect of the ongoing events in the region of Jordan. The energy resources are decreasing over time and that also has a negative effect on the Jordanian economy. Providing energy is always a vital and significant problem in Jordan. Jordan on the other hand is a rich in some of the renewable energy resources, which are not fully used until this moment. Therefore, it is essential to find alternative and renewable energy resources. Moreover, there is also a lack in creating a clear and long term future plans in the energy field. In this paper, energy sources and the efficiency of the energy sector in Jordan will be specified, in addition to the determination of the cofounders and sponsors for enhancing and developing the energy sector. The shift in policy that is needed to increase this efficiency will be also investigated.

scholarly journals Opportunities of renewable energy use in Hajdú-Bihar and Szabolcs-Szatmár-Bereg counties

2015 ◽  
pp. 143-146
Author(s):  
András Tamás
Keyword(s):  
Renewable Energy ◽  
Energy Use ◽  
Renewable Energy Sources ◽  
Environmental Conservation ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Security Of Supply ◽  
Technical Parameters

Today it's an important role of the renewable energy resources, improving energy efficiency, thereby contributing to sustainable, ecofriendly use of local energy resources. Globally intensify the requirements and considerations related to environmental conservation. In this light, the main objective of the Hungarian energy concept is to maintain long-term security of supply, the economy and the environment occurring contradictions. So there is a need for systems that, in compliance with EU environmental directives, acceptable cost level will ensure the desired and expected security of supply. In the study, three companies and other technical parameters of these are examined. For each undertaking, different results were observed. For two undertakings, we are talking about realized investments, in one case a prognosis was examined. All three companies contributed to the requirement of renewable energy sources reaching 13% in Hungary by 2020.

The Simulation of Processes and Performances within Low Enthalpy Geothermal Power Plants

2014 ◽  
Vol 875-877 ◽  
pp. 1647-1653
Author(s):  
Crina Panea ◽  
Ioan Felea ◽  
Ioan Almăşan
Keyword(s):  
Renewable Energy ◽  
Geothermal Energy ◽  
Power Plants ◽  
Electric Energy ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Major Objective ◽  
Geothermal Resources ◽  
International Strategies ◽  
Short Presentation

On the perspective of constant development, a major objective of today’s international strategies – the exploitation of nonpolluting resources becomes a very important aspect. Geothermal energy represents one of the renewable energy resources. The exploitation of geothermal resources of low enthalpy with the aim of producing electric energy is a well extended direction of development. The paper is dedicated to the simulation of processes and performances within equipments which build up a GPP having as a destination the exploitation of low enthalpy geothermal deposits. After the short presentation of the actuality subject and the structure of GPP we pass on to the draft modules for the equipments from the GPP structure, with the aim of specific processes simulation. By using the programming medium Matlab/Simulink we apply the model for a GPP which will function according to pre-established conditions. The obtained result after simulation are verry good, and the most important parameter wich is followed is the efficiency of the plant. The results for this parameter is high for this type of power plants.

Redox Flow Battery Sebagai Perangkat Penyimpanan Energi

2021 ◽  
Vol 2 (2) ◽  
pp. 63-71
Author(s):  
Septiani Silitonga ◽  
Ricky Therisno ◽  
Richard A.M. Napitupulu ◽  
Charles S.P. Manurung ◽  
Parulian Siagian ◽  
...  
Keyword(s):  
Energy Resources ◽  
Cycle Performance ◽  
Redox Flow Battery ◽  
Renewable Energy Resources ◽  
Term Operation ◽  
Redox Flow Batteries ◽  
Major Constraint ◽  
Battery Capacity ◽  
Vanadium Redox

Energy storage such as vanadium redox flow batteries (VRFB) has increased to store renewable energy resources in the last decade. However, the unbalanced crossover level of vanadium is often a major constraint which has a significant impact on battery capacity and life cycle in long-term operation. Performing an asymmetric electrolyte volume is one of many ways to solve this problem. The different volumes on the positive and negative sides were analyzed to see their effect in suppressing the decrease in VRFB capacity. With the result of the optimal electrolyte excess ratio, long-term cycle performance was carried out to investigate the reduction in capacity of VRFBs.

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