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[en] In this study environmental radioisotopes of water (3H and 14C) were used to determine the residence time of thermal waters. The temperature of geothermal waters was found to be uniform (57.6 °C ± 0.75 °C) with similar field alkalinity and pH values. The δ13C values of thermal water ranged between - 21.3 and - 18.75 ‰, which clearly reflect no/minimum contribution of carbonate minerals to the system. Environmental tritium concentration was found to be very low in these thermal waters indicating insignificant recharge from modern sources. The Pearson modelled 14C ages were found to vary from 4964 to 17,714 years. (author)
[en] After some brief recalls of definitions (surface and deep geothermal energy), indications of some operational characteristics (high and low energy geothermal, heat pumps), indications of the various fields of application of these different approaches and techniques, indications of some key data (turnover, production, potential), this publication proposes an overview of the various assets of this sector: a local, available, performing, and clean energy, a structured sector. It outlines the essential role of geothermal energy in reaching the objectives of the law on energy transition, but also that the development rate is still insufficient to reach the objectives defined for 2023. Then, measures and actions are proposed to free the whole potential of the geothermal energy sectors.
[en] This guide presents the vision of the professionals of the AFPG (the French professional association of geothermal energy) for a good design of moderate-temperature (inferior to 30 C) water loop based on geothermal energy or BETEG in order to meet thermal needs (heat and cold) at the scale of several buildings while sharing geothermal capture systems. The authors first present the BETEG, its associated geothermal resources, its different production modes, its ability to share energy among buildings, its ability for evolution and modularity, its potential in the valorisation of thermal storage, its control. It describes the various equipment and their components: capture device, sharing device, production device, control device. Its describes the principle of a moderate-temperature water loop (communication, supply, storage, valorisation, decentralisation of production), briefly presents some characteristics of an application depending on its scale, and evokes the assessment and definition of energetic needs. Then, other aspects of an operation are addressed: legal framework of an energy network, operation planning, intervener and funding, and regulatory framework of surface geothermal energy. Some cases are finally presented as returns on experience
[en] This guide presents the vision of the professionals of the AFPG (the French professional association of geothermal energy) for a good design of a geothermal system which will meet thermal and air-conditioning needs at the scale of one or several buildings, with a multiple choice of solutions for geothermal captures in the case of several buildings. It aims at presenting the whole set of elements to be known before starting a project of development or realisation of a proximity geothermal operation (or surface geothermal operation) implementing heat pumps coupled with a capture system. After a definition of surface geothermal energy, the guide presents its different devices (capture devices, production devices, control and monitoring device). It describes the situation of geothermal energy within the building market. Then, it describes the organisation, planning and interventions of a geothermal operation. The situation of the sector is then described (regulation reform, small geothermal, regulative approaches, required expertise, certifications)
[en] World energy demand is increasing and non-renewable resources are decreasing by exponentially putting a huge burden on the energy sector specifically on the oil and gas industry. To overcome these challenges, renewable energy is the best option with production optimization in the oil and gas sector. However, among all renewable energies, geothermal is the most suitable energy due to its sustainability and presence around the clock. Moreover, there are three types of wells for harnessing geothermal energy such as: producing oil and gas well, abandoned oil and gas wells and geopressured brine well with dissolved gas. In this research study, the author’s considers the technical aspects of electricity generation through oil and gas wells. The power capacity of these wells is determined by the production rate of the well mass flow (m) and temperature (T) of these wells. The main factors that control the wellhead temperature are mass flow rate and formation temperature. Our assessment of gas-producing well in the Kandhkot region showed the wellhead temperature of the produced fluid is too low, compared to ambient temperature for commercial generation of geothermal power. In our work, a conceptual design system to produce power from produced gas by using Solid Works Software is proposed and we have found some positive results. Seven well from the Kandhkot gas field were selected with different mass flow rates and negligible wellhead temperature difference. Author’s found the minimum power net output 21kW at the gas mass flow rate of 0.098504 kg/s with 7.5% thermal efficiency and maximum net output 27.5 kW at gas mass flow rate of 4.102524 kg/s with 10% thermal efficiency. The overall net output power produced from seven well is 174kW and can supply to local communities. (author)
[en] Ethiopia’s vulnerability to the impacts of climate change is due to social, economic and environmental factors particularly population growth, and high level of reliance on rain-fed agriculture and environmental degradation. GHG emissions are increasing because of unsustainable use of natural resources and other antagonistic environmental effects. The Government initiated the Climate-Resilient Green Economy (CRGE) initiative to reduce such adverse effects of climate change. This initiative is a road map for achieving its ambition of reaching middle income status before 2025. Different priority project ideas were also identified through the National Adaptation Program of Action (NAPA) process which addresses climate change adaptation needs of the country. The projects mainly focus in the areas of human and institutional capacity building, improving natural resource management. One of the priority and critical indicators of progress towards achieving the development goals is access to modern energy services. Though; the country is reach in renewable energy sources; it utilizes small portions of hydro, wind solar, wind and geothermal energies. Hence; the Government is planning to embark nuclear power as an alternative option to enhance the energy mix. In this regard it has taken the first step and signed an agreement with Russia setting out a three-year plan to lay the ground for the construction of a center for nuclear science and technology and a nuclear power plant.
[en] This international workshop entitled “How to integrate geochemistry at affordable costs into reactive transport for large-scale systems” was organized by the Institute of Resource Ecology of the Helmholtz-Zentrum Dresden Rossendorf in February 2020. A mechanistic understanding and building on that an appropriate modelling of geochemical processes is essential for reliably predicting contaminant transport in groundwater systems, but also in many other cases where migration of hazardous substances is expected and consequently has to be assessed and limited. In case of already present contaminations, such modelling may help to quantify the threads and to support the development and application of suitable remediation measures. Typical application areas are nuclear waste disposal, environmental remediation, mining and milling, carbon capture & storage, or geothermal energy production. Experts from these fields were brought together to discuss large-scale reactive transport modelling (RTM) because the scales covered by such predictions may reach up to one million year and dozens of kilometers. Full-fledged incorporation of geochemical processes, e.g. sorption, precipitation, or redox reactions (to name just a few important basic processes) will thus create unacceptable long computing times. As an effective way to integrate geochemistry at affordable costs into RTM different geochemical concepts (e.g. multidimensional look-up tables, surrogate functions, machine learning, utilization of uncertainty and sensitivity analysis etc.) exist and were extensively discussed throughout the workshop. During the 3-day program of the workshop keynote and regular lectures from experts in the field, a poster session, and a radio lab tour had been offered. In total, 40 scientists from 28 research institutes and 8 countries participated. The focus of the workshop was: (1) To provide and discuss existing geochemical concepts in reactive transport modelling to describe sorption and related retardation processes of contaminants on a variety of sediments and rocks. (2) To explicitly set focus on large-scale natural systems as experienced, e.g., in nuclear waste disposal, carbon capture & storage, environmental remediation, or geothermal applications. (3) To explore how the discussed approaches can be integrated at affordable costs into current paradigms in THMC models and long-term safety assessments in general. (4) To promote the exchange of scientific knowledge and practical experience between the workshop participants in an efficient way. Based on the intensive discussions and very positive feedback on the workshop, a continuation is intended to bundle and strengthen the respective research activities and stipulate the international network that started to form during the conference days.
[en] Examples of partnerships from IRENA: - Global Geothermal Alliance; - SIDS Lighthouses Initiative; - Open Solar Contracts; - Long-Term Energy Scenarios for the Clean Energy Transition; - Coalition for Action.
[en] This publication aims at proposing a detailed analysis of costs of four surface geothermal technologies: vertical geothermal probes, geothermal energy on aquifer, horizontal sensors, and geothermal baskets. It first presents the adopted methodology, some general hypotheses (studied examples, heat pumps, comparative solutions for heating, energy costs, hypotheses for cooling, aids and loans), and the four technologies with their specific hypotheses. Results are presented for the different building sectors: individual housing, collective housing, and office building