GES-CAL: A new computer program for the design of closed-loop geothermal energy systems

Geothermics ◽  
2020 ◽  
Vol 87 ◽  
pp. 101852 ◽  
Author(s):  
Cristina Sáez Bláquez ◽  
Ignacio Martín Nieto ◽  
Rocío Mora ◽  
Arturo Farfán Martín ◽  
Diego González-Aguilera
Keyword(s):  
Computer Program ◽  
Geothermal Energy ◽  
Closed Loop ◽  
Energy Systems

scholarly journals Shallow geothermal energy in Denmark

1969 ◽  
Vol 26 ◽  
pp. 37-40
Author(s):  
Thomas Vangkilde-Pedersen ◽  
Claus Ditlefsen ◽  
Anker Lajer Højberg
Keyword(s):  
Co2 Emissions ◽  
Geothermal Energy ◽  
Best Practice ◽  
Fossil Fuels ◽  
Closed Loop ◽  
Energy Systems ◽  
Know How ◽  
Heating And Cooling ◽  
Ground Source ◽  
Shallow Geothermal Energy

The use of shallow geothermal energy instead of fossil fuels can lead to substantial reductions in CO2 emissions. However, the use of shallow geothermal energy in Denmark is limited compared to, e.g. Sweden and Germany and we still lack know-how and experience with its use in Denmark. In co-operation with research and industry partners, the Geological Survey of Denmark and Greenland is conducting a three-year project GeoEnergy, Tools for ground-source heating and cooling based on closed-loop boreholes (www.geoenergi.org). The objective of the project is to acquire knowledge and develop tools and best practice for the design and installation of shallow geothermal energy systems.

5.18 Energy Management in Geothermal Energy Systems

2018 ◽  
pp. 742-777 ◽  
Author(s):  
Francesco Calise ◽  
Adriano Macaluso ◽  
Antonio Piacentino ◽  
Laura Vanoli
Keyword(s):  
Energy Management ◽  
Geothermal Energy ◽  
Energy Systems

An Improved Closed-Loop Heat Extraction Method From Geothermal Resources

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Arash Dahi Taleghani
Keyword(s):  
Contact Area ◽  
Geothermal Energy ◽  
Closed Loop ◽  
Produced Water ◽  
Heat Extraction ◽  
Working Fluid ◽  
Induced Earthquakes ◽  
Geothermal Resources ◽  
Major Mechanism ◽  
Pressure Changes

Disposal of produced water and induced earthquakes are two major issues that have endangered development of the geothermal energy as a renewable source of energy. To avoid these problems, circulation of a low-boiling working fluid in a closed loop has been proposed; however; since the major mechanism in this method for heat extraction is conduction rather than convection and additionally the heat conduction is limited to the wellbore surface. To overcome this shortcoming, the formation can be fractured with high conductivity material (for instance, silicon carbide ceramic proppants or cements with silane and silica fume as admixtures) to artificially increase the contact area between the “working fluid” and the reservoir. Our calculations show that fracturing increases the contact area by thousand times, additionally, the fracturing materials reinforce and stressed the formation, which reduce the risk of seismic activity due to temperature or pressure changes of the system during the production.

scholarly journals Numerical evaluation of building heating potential from a co-axial closed-loop geothermal system using wellbore–reservoir coupling numerical model

2019 ◽  
Vol 38 (3) ◽  
pp. 733-754 ◽  
Author(s):  
Tianfu Xu ◽  
Zixu Hu ◽  
Bo Feng ◽  
Guanhong Feng ◽  
Fengyu Li ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Closed Loop ◽  
Heating System ◽  
Coupling Model ◽  
Production Performance ◽  
Heat Extraction ◽  
Geothermal System ◽  
Renewable Energy Resources ◽  
Practical Engineering ◽  
System Maintenance

Geothermal energy is one of the most potential renewable energy resources. How to efficiently extract and utilize geothermal energy has been a worldwide hot topic. Co-axial closed-loop geothermal system is a novel method using a continuously closed wellbore without water exchange with. It is more suitable for reservoirs with medium or low temperature and permeability because many problems could be avoided such as lack of in situ groundwater or low infectivity of the reservoir. Many companies and research institutes have applied closed-loop geothermal system in building heating engineering and some fine results have been gained. However, in practical engineering construction, the area of a closed-loop geothermal system heating system is a very important parameter. It directly determines the cost accounting and initial design of the project. Accurate and reliable estimation of heating capacity becomes very important. In this study, a wellbore–reservoir coupling model is established, which is calibrated using measured data from a short-term field trial operation. We have carried out mixed convective–conductive fluid-flow modeling using a wellbore flow model for TOUGH2 called T2Well to investigate the heat extraction performance of closed-loop geothermal system. The system evolution and the effect of flow rate and injection temperature on heat production performance are discussed. The result shows that the intermittent production cycles are more beneficial for heat extraction and system maintenance, and the temperature recovery between two heating seasons is enough to maintain system heating. And we can calculate that a geothermal well can ensure heating of buildings of 10,000–20,000 m2 and the heating area of intermittent operation is 4000 m2 more than continuous operation. Besides, the sensitivity analysis of parameters is also carried out.

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.

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