scholarly journals Using open software to teach resource assessment of solar thermal and geothermal energy

Author(s):  
Alain Ulazia ◽  
Aitor Urresti ◽  
Alvaro Campos ◽  
Gabriel Ibarra-Berastegi ◽  
Mirari Antxustegi ◽  
...  

The students of the Faculties of Engineering of the Universitty of Basque Country (Gipuzkoa-Eibar and Bilbao) in the last years of their studies, before becoming engineers, have the opportunity to select a block of subjects intended to enhance their knowledge on renewable energy systems. One of these subjects is Solar Thermal and Geothermal energy. These subjects are devoted to assessing the renewable energy resource, and designing optimal systems. Apart from the transmission of good practices, the focus is practical and is based on hands-on computer real-life exercises, which involves not only intensive programming using high-level software, but also the spatial representation of results. To that purpose two main open source codes are used: Octave (https://www.gnu.org/software/octave/), and QGIS (https://www.qgis.org/). Students learn how to address real-life problems regarding the geographical representation of solar radiation and low temperature geothermal resources using QGIS, and solar thermal system modelling using Octave.

Author(s):  
Alain Ulazia ◽  
Gabriel Ibarra-Berastegui ◽  
Mirari Antxustegi ◽  
Maria Gonzalez ◽  
Alvaro Campos ◽  
...  

The students of the Faculties of Engineering of the Universitty of Basque Country (Gipuzkoa-Eibar and Bilbao) in the last years of their studies, before becoming engineers, have the opportunity to select a block of subjects intended to enhance their knowledge on Wind Energy, Ocean Energy, Biomass and Hydraulic Energy. These subjects are devoted to different aspects of the water cycle management, and geographical representations of wind, ocean and biomass energy resource. Apart from the transmission of good practices, the focus is practical and is based on hands-on computer real-life exercises, which involves not only intensive programming using high-level software, but also the spatial representation of results. To that purpose three main open source codes are used: EPANET (https://www.epa.gov/water-research/epanet), QGIS (https://www.qgis.org/) and R (https://www.cran.r-project.org/). Students learn how to address real-life problems regarding the correct calculation of water distribution networks with EPANET, geographical representation of wind and ocean energy resource with R, and spatial representation of biomass resource with QGIS.


Author(s):  
Marco Frey ◽  
Francesco Rizzi

- This paper describes the state of the art in development and utilization of geothermal resources in Italy and Tuscany. Departing from the geological peculiarities of this region, which have contributed to Italy's leading role in technological innovation since the beginning of geothermoelectric power generation (GPG), recent evidences from the market and scientific community are here analyzed in order to answer the question whether the economic downturn will put geothermal energy on the back burner, or if it will function as a catalyst for change. The first section explores the role of geothermal energy within the renewable energy mix. After an introduction on the strengths and weaknesses of the Italian energy system, the evolution of the matches between different types of geothermal resources (high, medium and low enthalpies) and technologies is analyzed from an economic, technical and environmental point of view. Here, the evolution of the regulatory framework emerges as one of the main driving forces behind incremental innovation and the spreading of technologies. The move towards sustainability seems to stimulate the market in spite of the barriers to entry linked to capital intensiveness and the risks related to geothermal investments. Beside the growth of relationships between industrial actors, public administration and scientific community, the analysis identifies the downscale of plants, the integration with other "renewables" and the industrial integration as the main next challenges in the field of geothermal competitiveness. To this end, the implementation of such new tools for territorial management as the ones based on LCA (Life Cycle Assessment) and SMCE (Social Multi Criteria Evaluation) is expected to stimulate further improvements and innovations. The second section analyzes the present regulatory framework at the communitarian, national and local level and the allocation of economical resources to research and development in particular in relation to the distribution and characteristics of the geothermal resources. The specialization of Italy in GPG appears not to be adequately represented within European programmes and the Tuscany region is still considered not a leading market by the investors in geothermal heat pumps and geothermal district heating. Both according to the communitarian prescriptions and the requests from local actors, a few scenarios for the development of guidelines, certification schemes and regulations are here described. These elements are consistent with the purpose of sustainability and competitiveness of local economic activities. On the basis of these evidences, the third section describes the perspectives of development of medium and low enthalpy utilizations in Italy. According to the present financial incentives schemes and the predicted modifications in relevant regulations (i.e. city plans, building regulations, etc.), a booming growth of installations is expected. This geothermal "green new deal" is pulled by the increasing number of life-long learning programmes for professionals (i.e. geologists) and, even more, is expected to be pulled by the implementation of risk management tools and certification schemes. As result, the analysis sets a roadmap for addressing the needs of geothermal actors and removing the barriers to successful investing in this local and renewable energy resource. When we return to the initial question, it seems to be the moment for changing attitude towards energy production and to win back competitiveness and sustainability in the geothermal market.Key words: Geothermal energy, renewable energy sources, energy policy, sustainable development, know how, industrial systems, certifications schemes, risk management.JEL classifications: O13, Q42.Parole chiave: Geotermia, fonti energetiche rinnovabili, politiche energetiche, sviluppo sostenibile, competenze, sistemi industriali, schemi di certificazione, gestione del rischio.


2018 ◽  
Vol 4 (7) ◽  
Author(s):  
Andrijana Stevanović ◽  
Boban Jolović

One of the most used renewable energy sources worldwide is geothermal energy. Itrepresents the heat, originated by natural processes happen in the Earth interior. The hot springsphenomena are the most frequent natural manifestation of geothermal activity.Geothermal potentiality of some area can be estimated based on geothermal gradient. Geothermalgradient is a conductive terrestrial parameter that represents the degree of increasing of the Earthtemperature vs. depth. It is usually expressed in ⁰C/m or ⁰C/km. Different areas have differentthermal gradients and thus different geothermal potential. Generally, higher geothermal gradientscorrespond to areas containing more geothermal energy.Geothermal characteristics of the territory of the Republic of Srpska are closely related to itscomplex geological setting. It is the reason why geothermal characteristics are different from areato area. Higher geothermal potentiality is recognised in the northern parts of the entity, in the firstorder in Semberija, Posavina and Banja Luka regions.The use of geothermal energy with different fluid temperatures can be considered throughthe Lindaldiagram, who firstly proposed acomprehensive scale with appropriate temperatures for differentuses. High temperature fluids are mostly used for electricity production and moderate and lowtemperature fluids for the direct use.Despite the fact that the territory of the Republic of Srpska hasfavourable geothermal properties, utilization of this kind of renewable energy resource isinadequate. Especially indicative are data about the use of geothermal energy by heat pumps (inbad sense) in comparison with praxis of developed countries.Chemical composition of thermal waters plays very important role and can be used in itsexploration stage, for analyses of possibility of its use and for prediction of exploitation effects, aswell. This kind of renewable energyresource, highly ecologically recommended, must be consideredmore seriously in the future in the Republic of Srpska. Furthermore, it must be put into the energystrategic documentsin appropriate manner.


Author(s):  
Allison Gray ◽  
Aaron Sahm ◽  
Marc Newmarker ◽  
Rick Hurt ◽  
Robert Boehm ◽  
...  

University of Nevada, Las Vegas Renewable Energy Center (UNLV-REC) currently monitors three meteorological stations in southern Nevada under the direction of the National Renewable Energy Laboratory (NREL) and is funded by the Nevada Southwest Energy Partnership (NSWEP). The three station locations are Eldorado Valley, UNLV-REC Solar Site, and Nevada Power Company Clark Station. The installation dates for each of the locations were October of 2004 for Eldorado Valley station, August of 2003 for the UNLV-REC Solar Site, and March of 2006 for the Nevada Power Clark Station. Publicly available data from each site have been archived since installation completion. This paper discusses the installation of the equipment for each site and images of the setup. The data that is being collected between the sites is also compared. Data comparisons between the sites include net monthly solar energy; monthly peak direct normal irradiance (DNI), average daily wind speed, monthly wind roses, and average monthly dry bulb temperatures. The recently measured data is also compared to resource maps developed by NREL and to TMY data. With these meteorological resources, microclimatic variations can be studied for the area and used as a renewable energy resource for renewable installations in southern Nevada.


Author(s):  
Onur Koşar ◽  
Mustafa Arif Özgür

Kütahya is considered as a candidate region for a wind farm investment due to Turkey's 2023 energy targets and its proximity to other wind farm investments. In this study, two years of wind data collected from a hill near the Evliya Çelebi Campus of Kütahya Dumlupınar University was used to evaluate the wind farm potential of Kütahya. First, the wind speed, wind direction, wind shear, turbulence intensity and wind speed ramp characteristics were determined. Second, the WAsP software was used to create a wind atlas for the region. Three sites with strong wind potential were evaluated. A techno-economic analysis was conducted using five types of wind turbines selected from the WAsP database. Third, optimization of a wind farm layout was conducted by considering different hub height options for 14 commercial wind turbines using MATLAB software. It was shown theoretically that a wind farm with a power capacity of 25 MW can operate with a capacity factor of 35%. However, due to the relatively high topographical ruggedness index on the wind farm site, the calculated value for the capacity factor could not be reached in a real-life application.


2014 ◽  
Vol 541-542 ◽  
pp. 911-915
Author(s):  
Hong Bin Liu ◽  
Yong Sheng Shi ◽  
Lei Zhang ◽  
Ming Qiu

Geothermal energy provides the renewable energy sector with an opportunity to produce base load power, whilst meeting current government objectives of many countries in relation to greenhouse gas emission and renewable energy portfolio standards. The utilization of geothermal power develops well in many developed countries, such as America, Japan, France, Italy, Iceland, etc. But it is still at an early stage in China. The development of alternative energy such as geothermal energy is as a basic national policy. It is also an important issue for China how to make good use of geothermal resource currently. In this paper, according to the distribution, we introduce the development and utilization of Chinese geothermal resources.


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