Economic and environmental assessment of enhanced geothermal systems integration into energy systems: decision-making support tool for optimal usage of geothermal energy

2018 ◽  
Author(s):  
P. Ilak ◽  
S. Raos ◽  
I. Rajšl ◽  
T. Bilić ◽  
G. Trullenque ◽  
...  
Keyword(s):  
Decision Making ◽  
Environmental Assessment ◽  
Geothermal Energy ◽  
Systems Integration ◽  
Energy Systems ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Support Tool ◽  
Decision Making Support

scholarly journals Definition of LCA Guidelines in the Geothermal Sector to Enhance Result Comparability

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3534 ◽  
Author(s):  
Maria Laura Parisi ◽  
Melanie Douziech ◽  
Lorenzo Tosti ◽  
Paula Pérez-López ◽  
Barbara Mendecka ◽  
...  
Keyword(s):  
Decision Making ◽  
Life Cycle ◽  
Geothermal Energy ◽  
Methodological Approach ◽  
Geothermal Systems ◽  
Low Carbon ◽  
Large Variability ◽  
Low Carbon Economy ◽  
Methodological Choices ◽  
Construction Operation

Geothermal energy could play a crucial role in the European energy market and future scenarios focused on sustainable development. Thanks to its constant supply of concentrated energy, it can support the transition towards a low-carbon economy. In the energy sector, the decision-making process should always be supported by a holistic science-based approach to allow a comprehensive environmental assessment of the technological system, such as the life cycle assessment (LCA) methodology. In the geothermal sector, the decision-making is particularly difficult due to the large variability of reported results on environmental performance across studies. This calls for harmonized guidelines on how to conduct LCAs of geothermal systems to enhance transparency and results comparability, by ensuring consistent methodological choices and providing indications for harmonized results reporting. This work identifies the main critical aspects of performing an LCA of geothermal systems and provides solutions and technical guidance to harmonize its application. The proposed methodological approach is based on experts’ knowledge from both the geothermal and LCA sectors. The recommendations cover all the life cycle phases of geothermal energy production (i.e., construction, operation, maintenance and end of life) as well as a selection of LCA key elements thus providing a thorough base for concerted LCA guidelines for the geothermal sector. The application of such harmonized LCA framework can ensure comparability among LCA results from different geothermal systems and other renewable energy technologies.

scholarly journals DEVELOPMENT OF THE TECHNIQUE OF OPERATION OF GEOTHERMAL SYSTEMS WHEN EXTRACTING ASSOCIATED GASES

2019 ◽  
Vol 45 (3) ◽  
pp. 29-38
Author(s):  
G. Ya. Akhmedov ◽  
A. S. Kurbanismailova
Keyword(s):  
Waste Water ◽  
Carbon Dioxide ◽  
Geothermal Energy ◽  
Water Solution ◽  
Energy Systems ◽  
Hot Water ◽  
Geothermal Water ◽  
Mineral Waters ◽  
Geothermal Systems ◽  
North Caucasus

Objectives. The aim of the study is to develop a method of operating geothermal energy systems in the mode without scaling when disposing of flammable gases with geothermal water in wells with a low gas factor.Method. The studies were conducted on the basis of analyzing the content of associated flammable gases in the underground thermal mineral waters of the North Caucasus and Ciscaucasian deposits and assessing the possibility of their utilization and use for heating and hot water supply. In this case, the laws of dissolution and desorption of methane and carbon dioxide from groundwater solutions with the content of scale-forming components, in particular, calcium carbonate, are used.Result. On the basis of the conducted research, it was found that the operation of g eothermal systems in the power industry should be carried out after preliminary withdrawal of the maximum possible amount of associated flammable gases from a water solution, while maintaining the content of carbon dioxide in water at a level above the equilibrium value. The scheme of the effective operation of thermal distribution stations with the prevention of carbonate deposits in them is given by using the products of associated gas combustion in the waste water when it is pumped back into the aquifer.Conclusion. As a result of the research conducted, a method of operating geothermal energy systems in a non-salt-scale mode has been developed for utilization of combustible gases associated with geothermal water. It has been established that in order to accelerate the dissolution of carbon dioxide in water to stabilize it before entering heat-exchange equipment, it is advisable to increase the partial pressure of carbon dioxide to values exceeding by an order of magnitude the equilibrium at a given temperature. At the same time, before pumping waste water back into the aquifer, excess carbon dioxide is removed from the water.

scholarly journals S1252 Can a Single Decision-Making Support Tool Spare Inpatients From Inappropriate Testing for Nosocomial Diarrhea?

2020 ◽  
Vol 115 (1) ◽  
pp. S629-S629
Author(s):  
Shaadi J. Abughazaleh ◽  
Ghazaleh Eskandari ◽  
Lilian Vargas Barahona ◽  
Scott Long ◽  
Gulchin A. Ergun
Keyword(s):  
Decision Making ◽  
Support Tool ◽  
Nosocomial Diarrhea ◽  
Decision Making Support

scholarly journals Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

2021 ◽  
Author(s):  
Ziyang Zhou ◽  
Hitoshi MIKADA ◽  
Junichi TAKEKAWA ◽  
Shibo Xu
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Hydraulic Fracturing ◽  
Geothermal Energy ◽  
Confining Pressure ◽  
Numerical Results ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Compression Tests ◽  
High Confining Pressure

Abstract With the increasing attention to clean and economical energy resources, geothermal energy and enhanced geothermal systems (EGS) have gained much importance. For the efficient development of deep geothermal reservoirs, it is crucial to understand the mechanical behavior of reservoir rock and its interaction with injected fluid under high temperature and high confining pressure environments. In the present study, we develop a novel numerical scheme based on the distinct element method (DEM) to simulate the failure behavior of rock by considering the influence of thermal stress cracks and high confining pressure for EGS. We validated the proposing method by comparing our numerical results with experimental laboratory results of uniaxial compression tests under various temperatures and biaxial compression tests under different confining pressure regarding failure patterns and stress-strain curves. We then apply the developed scheme to the hydraulic fracturing simulations under various temperatures, confining pressure, and injection fluid conditions. Our numerical results indicate that the number of hydraulic cracks is proportional to the temperature. At a high temperature and low confining pressure environment, a complex crack network with large crack width can be observed, whereas the generation of the micro cracks is suppressed in high confining pressure conditions. In addition, high-viscosity injection fluid tends to induce more hydraulic fractures. Since the fracture network in the geothermal reservoir is an essential factor for the efficient production of geothermal energy, the combination of the above factors should be considered in hydraulic fracturing treatment in EGS.

scholarly journals Multiple-Criteria Decision-Making for Assessing the Enhanced Geothermal Systems

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1597 ◽  
Author(s):  
Raos ◽  
Ilak ◽  
Rajšl ◽  
Bilić ◽  
Trullenque
Keyword(s):  
Decision Making ◽  
Spatial Data ◽  
Risk Mitigation ◽  
Multiple Criteria Decision Making ◽  
Multiple Criteria ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Decision Matrix ◽  
Technical Specifications

This paper presents the main features of a multiple-criteria decision-making tool for economic and environmental assessment of enhanced geothermal systems projects. The presented holistic approach takes into account important influencing factors such as technical specifications, geological characteristics, spatial data, energy and heat prices, and social and environmental impact. The multiple-criteria decision-making approach uses a weighted decision matrix for evaluating different enhanced geothermal systems alternatives based on a set of criterions which are defined and presented in this paper. The paper, defines and quantifies new criterions for assessing enhanced geothermal systems for a particular site. For evaluation of the relative importance of each criterion in decision making, the weight is associated with each of the listed criterions. The different scenarios of end-use applications are tested in the case study. Finally, in the case study, the data and statistics are collected from real geothermal plants. The case study provides results for several scenarios and the sensitivity analysis based on which the approach is validated. The proposed method is expected to be of great interest to investors and decision makers as it enables better risk mitigation.

Simulation Model of a Production Facility of Agaricus bisporus Mycelium for Decision-Making Support

2017 ◽  
Vol 14 (2) ◽  
Author(s):  
Juan Ignacio Latorre-Biel ◽  
Emilio Jiménez ◽  
Mercedes Pérez ◽  
F.J. Leiva ◽  
E. Martínez ◽  
...  
Keyword(s):  
Decision Making ◽  
Agaricus Bisporus ◽  
Food Industry ◽  
Environmental Issues ◽  
Decision Support Tool ◽  
Production Facility ◽  
Key Factors ◽  
Support Tool ◽  
Optimal Decisions ◽  
Decision Making Support

AbstractSustainability and efficiency are key factors in agro-food industry, since the success of companies in this sector relies on the achievement of these objectives. Decision-making support may contribute decisively to this task. A model for a production facility of mycelium of the mushroom variety ofAgaricus bisporusis described. This model has been developed using the paradigm of the Petri nets and can be integrated in a decision support tool for performing structural analysis with the purpose of identifying certain features, such as feasible deadlocks. A complementary and promising possibility consists of using the model for performance evaluation by simulation of the behavior of the system in combination with the outcome of a life cycle assessment. This approach allows developing a what-if analysis or an optimization process to seek for good or quasi-optimal decisions taking into account financial, as well as environmental issues, among other possibilities.

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