Chepak O. P., Kostenko V.K., Zavyalova O.L. Determination of hydraulic parameters for geothermal heat exchanger

Details

Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 140

Geoteh. meh. 2018, 140, 166-175

DOI: https://doi.org/10.15407/geotm2018.03.166

DETERMINATION OF HYDRAULIC PARAMETERS FOR GEOTHERMAL  HEAT EXCHANGER

¹Chepak O. P., ¹Kostenko V.K., ¹Zavyalova O.L.

¹Donetsk National Technical University MES of Ukraine

UDC536.242:620.92:622.271

Language: English

Abstract.

Mineral mining by open cast is inevitably accompanied by anthropogenic transformation of fertile earths and hampers their practical use. The idea of the proposed method consists in creation of a treating object – a bioplateau - in the goaf of quarry. In the bioplateau, higher water plants will clean the quarry waters by way of absorbing mineral substances from water via roots, stems and leaves. Root, underwater and surface cellular mass will grow up and, in the process of the cell dying off and decomposition, will form humus part of fertile layer. Due to technical difficulties and high costs of water pumping into the borehole, it is necessary to determine basic hydraulic parameters of bioplateau for arranging its gravity flow. Purpose of the work was to determine basic hydraulic parameters for geothermal heat exchanger on the basis of determining of conditions for water gravity flowing through the tubular system of the given sizes. It is established that for arranging water feed into the geothermal borehole of biotreating object in the mode of gravity flow, it is necessary to arrange bottom of the «Morskaya Balka» Quarry with slope at angel no less 4°. One of the basic parameters, substantially impacting on the rate of hydraulic resistances, and, consequently, on the angle of quarry bottom slope, is diameters of external and internal pipe: the more is difference between diameters of external and internal pipe, the more is sum of hydraulic resistances. In order to diminish hydraulic resistances inside the geothermal borehole at diameter of external pipe 300 mm, diameter of internal pipe must make 0,25…0,3 of diameter of external pipe. Further increase of this relation does not give substantial decrease of pressure losses in geothermal heat exchanger. At diameter of external pipe of 200 mm, optimum diameter of internal pipe makes 0,35…0,4 of diameter of external pipe.

Keywords:  goaf, geothermal energy, geothermal heat exchanger, higher water plants.

References:

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5. Kostenko, V. K., Zavyalova, O. L., Box, I. V., Spinules, O. S., Chepak, O. P. and Filatov, I. Yu. Donetsk National Technical University (2014), Sposіb vidobuvannya geotermalnogo tepla [Method of geothermal heat extraction] State Register of Patents of Ukraine, Kiev, UA, Pat. № 91730

About the authors:

Chepak Olga Petrivna, Doctoral Student in the Department of Nature and Environmental Activity, Donetsk National Technical University MES of Ukraine, Pokrovsk, Donetsk Region, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kostenko Viktor Klimentovuch, Doctor of Technical Sciences (D. Sc.), Professor, Head of the Department of Nature and Environmental Activity, Donetsk National Technical University MES of Ukraine, Pokrovsk, Donetsk Region, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Zavyalova Olena Leonidivna, Candidate of Technical .Sciences (Ph. D.), Associate Professor, Associate Professor in the Department of Nature and Environmental Activity, Donetsk National Technical University MES of Ukraine, Pokrovsk, Donetsk Region, Ukraine,   This email address is being protected from spambots. You need JavaScript enabled to view it.

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