scholarly journals Utilization of geothermal springs as a renewable energy source: Vranjska Banja case study

2019 ◽  
Vol 23 (6 Part B) ◽  
pp. 4083-4093
Author(s):  
Stefan Denda ◽  
Jasna Micic ◽  
Ana Milanovic-Pesic ◽  
Jovana Brankov ◽  
Zeljko Bjeljac
Keyword(s):  
Geothermal Energy ◽  
District Heating ◽  
Field Research ◽  
Economic Assessment ◽  
Heating System ◽  
Energy Utilization ◽  
Geothermal Resources ◽  
Geothermal Heating ◽  
Public Facilities ◽  
Total Energy Balance

Despite the significant natural potential, geothermal energy in Serbia has traditionally been used in balneology and recreation, while its share in the country?s total energy balance is almost negligible (0.05%). The present paper deals with the City Municipality of Vranjska Banja as a pioneer in the territory of Serbia in using geothermal energy for heating. The concept and methodology of the present research are directly related to the utilization of geothermal resources for district heating in the Vranjska Banja area. The presented analysis includes: determining the available amount of energy, identifying the energy needs of selected public facilities, and the estimation of investment necessary for energy utilization. A survey, combined with field research, is focused on four public facilities connected to the heating system relying on geothermal sources, as well as on two facilities that should be connected to the system in the next phases. The results show economic, ecological, and technological advantages of using geothermal heating systems, as well as the acceptable price of equipment maintenance. An economic assessment of the transition of one facility from the existing heating system to a system relying on geothermal energy has also been made. The analysis confirms the cost-effectiveness of using geothermal energy and reveals numerous ecological advantages (safe heating, absence of CO2 emission) over other energy sources.

scholarly journals Selected technical aspects of well construction for geothermal energy utilization in Poland

2018 ◽  
Vol 7 (2) ◽  
pp. 188-199 ◽  
Author(s):  
Barbara Tomaszewska ◽  
Anna Sowiżdżał ◽  
Anna Chmielowska
Keyword(s):  
Geothermal Energy ◽  
Energy Utilization ◽  
Injection Wells ◽  
Geothermal Resources ◽  
Geothermal Heating ◽  
Current State ◽  
Exploratory Wells ◽  
Deep Boreholes ◽  
Deep Geothermal Energy ◽  
Domestic Law

Abstract Geothermal resources have been used in Poland since the 90s of the last century. Since then, several geothermal heating plants, recreation and balneological centers have been operated. Accessing geothermal resources is possible due to deep boreholes that are either brand-new wells or old but revitalized petroleum and/or exploratory wells. In this case, the construction of production and injection wells is of significant importance. The utilization of deep geothermal energy resources is strongly dependent on the binding domestic law regulations – primarily in case of acquiring the concession enabling an execution of geological and drilling works, and subsequently a proper exploitation. The paper presents the current state of development of the geothermal energy sector in Poland, indicating examples of exploitation systems based on deep boreholes. Furthermore, the constructions of existing wells are discussed extensively. The existing examples of old but reconstructed wells in Poland, are characterized. The importance of national law and its influence on the development of a geothermal investment is highlighted, as well.

Shallow geothermal energy integration in district heating system: An example from Serbia

2020 ◽  
Vol 147 ◽  
pp. 2791-2800 ◽  
Author(s):  
Miroslav V. Kljajić ◽  
Aleksandar S. Anđelković ◽  
Vaclav Hasik ◽  
Vladimir M. Munćan ◽  
Melissa Bilec
Keyword(s):  
Geothermal Energy ◽  
District Heating ◽  
Heating System ◽  
Energy Integration ◽  
District Heating System ◽  
Shallow Geothermal Energy

scholarly journals Research on a Coupled Total-Flow and Single-Flash (TF-SF) System for Power and Freshwater Generation from Geothermal Source

2020 ◽  
Vol 10 (8) ◽  
pp. 2689 ◽  
Author(s):  
Guopeng Yu ◽  
Zhibin Yu
Keyword(s):  
Power Generation ◽  
Geothermal Energy ◽  
Energy Utilization ◽  
Condensation Process ◽  
Total Flow ◽  
Combined System ◽  
Geothermal Resources ◽  
Single Flash ◽  
System Output ◽  
Efficiency Effects

In response to the twin development challenges of energy shortage and water-scarcity in worldwide arid to semi-arid regions with geothermal resources, a new combined power and freshwater generation system is proposed for geothermal energy utilization. In this system, a total-flow turbine (TF) is employed to be coupled with the traditional single-flash (SF) system and thereafter the coupled TF-SF system is investigated in this work. In addition to power generation, the exhaust steam from turbines are recovered to produce freshwater through condensation. Based on the novel designed system, the production of both power and water are studied under variable wellhead conditions, including variable wellhead pressures, temperatures, mass flowrates, and vapor qualities. The temperature of the separating point at which the total-flow expansion ends and the steam expansion starts is studied for optimal system output. In addition, the efficiency effects of the total-flow turbine on performance of the combined system is also investigated. The power generation comparison shows good power potential of the proposed TF-SF combined system. An effective total-flow turbine with an average efficiency of 65% can lead to an optimal power capacity, exceeding the traditional single-flash (SF) system by 23.7%. Moreover, more than 1/3 of total wellhead discharge can be recovered as desalinated freshwater by the naturally equipped condensation process of the power plant, showing extra benefit from geothermal energy utilization.

scholarly journals Some Problems of the Integration of Heat Pump Technology into a System of Combined Heat and Electricity Production

10.14311/212 ◽  
2001 ◽  
Vol 41 (2) ◽  
Author(s):  
G. Böszörményi ◽  
L. Böszörményi
Keyword(s):  
Heat Pump ◽  
District Heating ◽  
Heating System ◽  
Energy Utilization ◽  
Electricity Production ◽  
Geothermal Heat ◽  
District Heating System ◽  
Thermal Output ◽  
Short Period

The closure of a part of the municipal combined heat and power (CHP) plant of Košice city would result in the loss of 200 MW thermal output within a realtively short period of time. The long term development plan for the Košice district heating system concentrates on solving this problem. Taking into account the extremely high (90 %) dependence of Slovakia on imported energy sources and the desirability of reducing the emission of pollutantst the alternative of supplying of 100 MW thermal output from geothermal sources is attractive. However the indices of economic efficiency for this alternative are unsatisfactory. Cogeneration of electricity and heat in a CHP plant, the most efficient way of supplying heat to Košice at the present time. If as planned, geothermal heat is fed directly into the district heating network the efficiency would be greatly reduced. An excellent solution of this problem would be a new conception, preferring the utilization of geothermal heat in support of a combined electricity and heat production process. The efficiency of geothermal energy utilization could be increased through a special heat pump. This paper deals with several aspects of the design of a heat pump to be integrated into the system of the CHP plant.

scholarly journals Geothermal potential, chemical characteristic and utilization of groundwater in Serbia

2021 ◽  
Author(s):  
Tanja Petrović Pantić ◽  
Katarina Atanasković Samolov ◽  
Jana Štrbački ◽  
Milan Tomić
Keyword(s):  
Geothermal Energy ◽  
Thermal Water ◽  
Pannonian Basin ◽  
Local Population ◽  
Hydrochemical Facies ◽  
Energy Utilization ◽  
Thermal Waters ◽  
Groundwater Temperature ◽  
Geothermal Resources ◽  
Geothermal Potential

Abstract In order to collect and unify data about all geothermal resources in Serbia, a database is formed. The database allows us to perceive the geothermal resources of Serbia and their potential for utilization. Based on the data available in the geothermal database, the estimated temperatures of reservoirs, heat power, and geothermal energy utilization were calculated. The database contains 293 objects (springs, boreholes) registered at 160 locations with groundwater temperature in the range between 20°C and 111°C. The maximum expected temperature of the reservoir is 146°C (according to the SiO2 geothermometer). Some thermal water is cooled while mixed with cold, shallow water. Geothermal resources are mostly used for balneology and recreation, and less for heating, water supply, bottling, fish and animal farms, agriculture, and technical water. 26% of all geothermal resources is used by the local population or has not been used at all. The annual utilization of geothermal energy for direct heat is 1507 TJ/yr, and the estimated capacity of geothermal energy in Serbia is 111 MWt. The results of analytical work were presented in the form of maps with a geological and hydrogeological background. Thermal waters are mostly registrated in the area of Tertiary magmatism. The three geothermal potential areas are identified: Pannonian basin-Vojvodina Province, Mačva-Srem and area from Jošanička Banja to Vranjska Banja (southern Serbia). Based on chemical analyses, four hydrochemical facies are distinguished. Thermal water mainly belongs to NaHCO3 or CaMgHCO3 hydrochemical facies, usually depending on the primary aquifer: karst, karst-fissured, intergranular or fissured.

On the influence of decommissioning an area thermal substation in a district heating system on heat consumption and costs in buildings – Long term field research

2022 ◽  
Vol 50 ◽  
pp. 101870
Author(s):  
Alicja Siuta-Olcha ◽  
Tomasz Cholewa ◽  
Mirosław Gomółka ◽  
Piotr Kołodziej ◽  
Dorte Skaarup Østergaard ◽  
...  
Keyword(s):  
District Heating ◽  
Field Research ◽  
Heating System ◽  
Heat Consumption ◽  
District Heating System ◽  
Term Field

scholarly journals Evaluation of integration of solar energy into the district heating system of the city of Velika Gorica

2016 ◽  
Vol 20 (4) ◽  
pp. 1049-1060 ◽  
Author(s):  
Andreu Felipe ◽  
Daniel Schneider ◽  
Goran Krajacic
Keyword(s):  
Low Temperature ◽  
District Heating ◽  
Economic Assessment ◽  
Heating System ◽  
Solar Heating ◽  
District Heating System ◽  
High Penetration ◽  
The City ◽  
Heating Plant ◽  
Reduction Of Costs

In the current situation the district heating system supplies the 32% of the total thermal consumption in the City of Velika Gorica. The main issue in the district heating system is the utilization of 14 small and distributed heat plants, each providing heat to a separate and individually disconnected heating grid. Reduction of costs and CO2 emissions can be reached with a high penetration of renewable sources. The aim of this paper is to evaluate and design the integration of a Central Solar Heating Plant with Seasonal Storage into the district heating system of the City. An economic assessment was made with a pessimistic and an optimistic prediction of the solar heat cost for ground mounted collectors and roof mounted collectors. The seasonal storage was chosen to be pit thermal energy storage; the system was modeled as a low-temperature district heating system with the real thermal demands of a district heating plant.

Characterisation of the Dogger and Trias deep ressources in Orléans Métropolis, Centre-Val de Loire region, France : 3D geomodel and first geothermal potential assessment

2021 ◽  
Author(s):  
Virginie Hamm ◽  
Laure Capar ◽  
Perrine Mas ◽  
Philippe Calcagno ◽  
Séverine Caritg-Monnot
Keyword(s):  
Seismic Data ◽  
Geothermal Energy ◽  
District Heating ◽  
Geological Model ◽  
Paris Basin ◽  
Reservoir Properties ◽  
Geothermal Resources ◽  
Geothermal Well ◽  
Geothermal Potential ◽  
Heating Networks

<p>In Ile-de-France region, in the center of Paris Basin, geothermal energy contributes to a large extent to the supply of heating networks with about 50 of the 70 deep geothermal installations dedicated to district heating in France. Those installations mainly exploit the Dogger limestones between 1500-2000 m deep, which are present throughout the Paris Basin. In the case of Centre Val-de Loire region, south of Paris Basin, deep geothermal energy is very little developed, only one geothermal well is currently in operation and targeting the Triassic aquifer at Chateauroux on the southern edge of the basin. A former doublet had also targeted the Trias at Melleray (Orléans metropolis) in the 1980’s but was shut down after one year due to reinjection problem.</p><p>In 2019, Orléans metropolis, in collaboration with BRGM, has launched a program in order to investigate its deep geothermal resources like the Dogger and Trias aquifers between 900 m and 1500 m deep. This action is in line with Orléans métropolis Territorial Climate Air Energy Plan (PCAET) and master plan for the heating networks adopted which foresee 65 000 additional dwellings to be connected using geothermal energy based heating networks.</p><p>In order to reduce the risks of failure of deep geothermal drilling, one of the prerequisites is a better knowledge of the subsurface. This requires the development of an accurate 3D subsurface geomodel as well as the most reliable possible hydrodynamic and thermal parameters to assess the geothermal potential. The purpose of this work was to produce a 3D geological model of the Dogger and Triassic units, on the scale of Orléans Metropolis, based on hydrocarbon and geothermal well data as well as interpretation of 2D seismic data. Seismic data acquired in the 1960s and the 1980s were processed and interpreted. A particular attention was paid to the Sennely fault and its geometry. It crosses the study area and was interpreted as a relay fault segmented in three parts. The horizon picking points were then converted from two-way time to depth and integrated in the GeoModeller software for the development of the 3D geomodel. It was then used for first hydrothermal simulations in order to assess the theorical potential of the Dogger and Trias aquifers at Orléans metropolis.</p><p>The 3D geomodel and first geothermal potential assessment have allowed defining areas of interest for geothermal development into the Dogger or Trias. However an initial exploratory drilling well or additional exploration techniques will be necessary to confirm/specify the reservoir properties (useful thickness, porosity, permeability) and the connectivity of the reservoir(s) and the flow rates that can actually be exploited, which cannot be predicted by the current geological model.</p>

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