Techno-Economic Performance of Closed-Loop Geothermal Systems for Heat Production and Electricity Generation

Geothermics ◽  
2022 ◽  
Vol 100 ◽  
pp. 102318
Author(s):  
Koenraad F. Beckers ◽  
Nicolás Rangel-Jurado ◽  
Harish Chandrasekar ◽  
Adam J. Hawkins ◽  
Patrick M. Fulton ◽  
...  
Keyword(s):  
Heat Production ◽  
Economic Performance ◽  
Electricity Generation ◽  
Closed Loop ◽  
Geothermal Systems

scholarly journals Applying Harmonised Geothermal Life Cycle Assessment Guidelines to the Rittershoffen Geothermal Heat Plant

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3820
Author(s):  
Mélanie Douziech ◽  
Lorenzo Tosti ◽  
Nicola Ferrara ◽  
Maria Laura Parisi ◽  
Paula Pérez-López ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Heat Production ◽  
Hot Spot ◽  
Resource Depletion ◽  
Potential Contribution ◽  
Geothermal Systems ◽  
Geothermal Heat ◽  
The Future ◽  
The Impact

Heat production from a geothermal energy source is gaining increasing attention due to its potential contribution to the decarbonization of the European energy sector. Obtaining representative results of the environmental performances of geothermal systems and comparing them with other renewables is of utmost importance in order to ensure an effective energy transition as targeted by Europe. This work presents the outputs of a Life Cycle Assessment (LCA) performed on the Rittershoffen geothermal heat plant applying guidelines that were developed within the H2020 GEOENVI project. The production of 1 kWhth from the Rittershoffen heat plant was compared to the heat produced from natural gas in Europe. Geothermal heat production performed better than the average heat production in climate change and resource use, fossil categories. The LCA identified the electricity consumption during the operation and maintenance phase as a hot spot for several impact categories. A prospective scenario analysis was therefore performed to assess the evolution of the environmental performances of the Rittershoffen heat plant associated with the future French electricity mixes. The increase of renewable energy shares in the future French electricity mix caused the impact on specific categories (e.g., land use and mineral and metals resource depletion) to grow over the years. However, an overall reduction of the environmental impacts of the Rittershoffen heat plant was observed.

scholarly journals Entanglement of Top-Down and Bottom-Up: Sociotechnical Innovation Pathways of Geothermal Energy in Switzerland

2019 ◽  
Vol 29 (1) ◽  
pp. 99-122 ◽  
Author(s):  
Olivier Ejderyan ◽  
Franziska Ruef ◽  
Michael Stauffacher
Keyword(s):  
Federal Government ◽  
Heat Production ◽  
Geothermal Energy ◽  
Electricity Generation ◽  
Electricity Production ◽  
Top Down ◽  
Bottom Up ◽  
Federal Policies ◽  
Deep Geothermal Energy ◽  
Policy Incentives

By looking at deep geothermal energy in Switzerland, this article illustrates how innovation pathways in federal countries take entangled forms between top-down and bottom-up. The Swiss federal government presents deep geothermal energy as an important technology to decarbonize electricity production. Setbacks in early projects have slowed these efforts. Despite strong policy incentives from the federal government, no electricity is being produced from geothermal projects in Switzerland in 2019. Based on four case studies, we analyze how some cantons and cities have taken different pathways: Rather than implementing federal objectives, they favor heat production instead of electricity generation. The relative success of these initiatives led federal authorities to modify their approach to promoting geothermal energy. This study shows that federal mechanisms and instruments alone are not enough to make energy infrastructures acceptable locally. To learn from bottom-up experiences and adapt federal policies to local reality, better coordination between the federal and subnational levels is needed.

Production of MgO From Residues of Saline Pools in “Las Coloradas” Yucatan, Mex. Using Thermochemical Energy Storage

2011 ◽  
Author(s):  
Jose Carlos Peraza Lizama ◽  
Carlos Martin Rubio Atoche ◽  
Alan Garcia Lira
Keyword(s):  
Energy Storage ◽  
Magnesium Oxide ◽  
Electricity Generation ◽  
Closed Loop ◽  
Sea Water ◽  
High Heat ◽  
Open Loop ◽  
Salt Ponds ◽  
Heat Of Decomposition ◽  
Iodine Reaction

This paper proposes a method of thermochemical-energy storage from magnesium sulfate recovered from salt ponds of sea water. The idea develops from a project originally thought to obtain magnesium oxide from a salt plant in the Yucatan Peninsula, Mexico. The new idea is based on the exploitation of the heat of decomposition of magnesium sulphate. In the traditional literature, closed-loop, reversible reaction is considered, whereas in this work, an open-loop is proposed; that is, sulphur dioxide is separated from the magnesium oxide before cooling down to 700°C; in this way, magnesium oxide is obtained by thermal decomposition, and at the same time, the high heat of decomposition is used to store thermal energy for electricity generation; magnesium oxide, sulfuric acid and hydrogen are co-products of the process if another iodine reaction cycle is considered. This second process is again a modification of an open-loop traditional process, to a closed-loop process where no sulphuric acid is required.

scholarly journals Thermo-hydro-mechanical modelling study of heat extraction and flow processes in enhanced geothermal systems

2021 ◽  
Vol 54 ◽  
pp. 229-240
Author(s):  
Dejian Zhou ◽  
Alexandru Tatomir ◽  
Martin Sauter
Keyword(s):  
Production Rate ◽  
Flow Rate ◽  
Heat Production ◽  
Analytical Solutions ◽  
Pressure Difference ◽  
Heat Extraction ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Fracture Zones ◽  
Heat Production Rate

Abstract. Enhanced Geothermal Systems (EGS) are widely used in the development and application of geothermal energy production. They usually consist of two deep boreholes (well doublet) circulation systems, with hot water being abstracted, passed through a heat exchanger, and reinjected into the geothermal reservoir. Recently, simple analytical solutions have been proposed to estimate water pressure at the abstraction borehole. Nevertheless, these methods do not consider the influence of complex geometrical fracture patterns and the effects of the coupled thermal and mechanical processes. In this study, we implemented a coupled thermo-hydro-mechanical (THM) model to simulate the processes of heat extraction, reservoir deformation, and groundwater flow in the fractured rock reservoir. The THM model is validated with analytical solutions and existing published results. The results from the systems of single fracture zone and multi-fracture zones are investigated and compared. It shows that the growth of the number and spacing of fracture zones can effectively decrease the pore pressure difference between injection and abstraction wells; it also increases the production temperature at the abstraction, the service life-spans, and heat production rate of the geothermal reservoirs. Furthermore, the sensitivity analysis on the flow rate is also implemented. It is observed that a larger flow rate leads to a higher abstraction temperature and heat production rate at the end of the simulation, but the pressure difference may become lower.

The Dynamics of Corporate Governance and Sustainability: A Study of the Indian Electricity Generation Industry

Think India ◽  
2014 ◽  
Vol 17 (3) ◽  
pp. 15-21 ◽  
Author(s):  
Ashok Kumar Sar
Keyword(s):  
Corporate Governance ◽  
Detailed Analysis ◽  
Economic Performance ◽  
Environmental Performance ◽  
Electricity Generation ◽  
Social Equity ◽  
Shareholder Rights ◽  
Board Structure ◽  
Sustainability Performance ◽  
The Relationship

This paper aims to reflect on the relationship between corporate governance and sustainability. Specifically, it aims to gain insights into the relationship between board structure, disclosure, related party transactions, shareholder rights, and board procedure and sustainability performance – economic performance, environmental performance and social equity performance - for the companies in the Indian Electricity Generating Industry. For the study, 286 companies from among the 402 companies listed in CMIE – PROWESS database for the industry were targeted. Although the aim was to take data from all 402 companies, complete data on the directors were available for only 286 companies from the Registrar of Companies. The study covers detailed analysis of corporate governance in these companies based on established theory and the structure of sustainability established. In the end, the positive relationships are summarized and implications for theory are discussed.

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