Abstract
This paper presents a study of the physico-chemical properties of geothermal fluids, coming from some wells in Sacuieni, Bihor County, Romania. The thermal energy of the geothermal waters studied is used for heating some industrial buildings, greenhouses, and administrative buildings. Continuous monitoring of physical and chemical characteristics of geothermal waters is needed. Based on this fact, a classification of these waters has been made according to their chemical composition. Using a silica-enthalpy thermodynamic model, it was possible to estimate the deep reservoir temperature, and compare it with the temperatures at depth, calculated by the silica (quartz and chalcedony) and Na+/K+ geothermometers. The WATCH program is used to estimate the mineral deposits that may accumulate due to boiling and cooling of the geothermal fluid when it is used in heat exchangers The results are confirmed by XRD spectrometric and thermogravimetric analyses.
Highlights
This paper presents a study of the physico-chemical properties of geothermal fluids, coming from some wells in Sacuieni, Bihor County, Romania
Geothermal water utilization in Romania [14] is based on direct use or through heat exchanger, when heated water is used as tap water in greenhouses, swimming pools and for technological purposes
This paper presents a study of the physico-chemical monitoring of these two wells from Sacuieni, using modeling programs based on composition of these waters, in order to get useful determinations for efficient operation of geothermal fluid energy
Summary
MIOARA SEBESAN1, GABRIELA ELENA BADEA1, RADU SEBESAN2, ILONA KATALIN FODOR3*, SIMONA BUNGAU3*, SIMONA TICU (COTORCEA)4 1University of Oradea, Faculty of Sciences, 1 Universitatii St., 410087, Oradea, Romania 2University of Oradea, Faculty of Electrical Engineering and Information Technology, 1 Universitatii Str., 410087, Oradea, Romania 3University of Oradea, Faculty of Medicine and Pharmacy, 29 Nicolae Jiga Str., 410028, Oradea, Romania 4Politehnica University of Bucharest, Faculty of Applied Chemistry and Materials Science, 1-7 Gh. In the last few decades many researchers developed geochemical geothermometers, which could have been used for different hydrogeological conditions In this area scientists have carried out many studies on geothermal waters [2-13], regarding: geochemistry [2,3,4,5,7,8,13], geothermometry [2,3,4,5,6,7,11,13], mineral saturation [5,7], geochemical modeling [5,8,12] and X-ray diffraction measurements [9,10]. This paper presents a study of the physico-chemical monitoring of these two wells from Sacuieni, using modeling programs based on composition of these waters, in order to get useful determinations for efficient operation of geothermal fluid energy. The X-ray analysis were done with a PHILIPS PW 1400 X-ray spectrometer using KαCu radiation, at chamber temperature, resulting in information on existing crystals in the solid samples
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