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Engineering, Energy, Transport AIC

space SCIENTIFIC JOURNALS OF VINNITSA NATIONAL AGRARIAN UNIVERSITY

Issue №: 2 (129)

Published: 2025.08.29
DOI: 10.37128/2520-6168-2025-2


Description:
The journal solves the problems of creation and improvement of machinery and technologies for agriculture: 131 - Applied Mechanics, 132 - Materials Science, 133 - Industrial Engineering, 141 - Power Engineering, Electrical Engineering and Electromechanics, 208 - Agricultural Engineering.

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NUMERICAL MODELING OF THERMAL PROCESSESIN VERTICAL GROUND HEAT EXCHANGERS

DOI: 10.37128/2520-6168-2025-2-1
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Vitalii YAROPUD – Candidate of Technical Sciences, Associate Professor, Dean of the Faculty of Engineering and Technology, Vinnytsia National Agrarian University (St. Soniachna, 3, Vinnytsia, Ukraine, 21008, e-mail: yaropud77@gmail.com, https://orcid.org/0000-0003-0502-1356).

Annotation

The article presents the results of numerical modeling of thermal processes in vertical ground heat exchangers of concentric and U-shaped types aimed at improving the energy efficiency of microclimate control systems in agro-industrial facilities. Analytical studies of pneumatic losses demonstrated that their magnitude is nearly identical for both configurations, while the capacity of the U-shaped heat exchanger exceeds that of the concentric design by 0.9–1.7 %, confirming the feasibility of its further application. Dependencies of the U-shaped exchanger’s capacity on its geometric parameters (length, diameter) and air flow rate were established, enabling optimization of its structural characteristics.
Numerical simulations conducted in Simcenter Star-CCM+ provided spatial distributions of temperature fields under various operating conditions. It was shown that, in summer, the air flow temperature decreases by 7.2 °C in the concentric and by 8.5 °C in the U-shaped exchanger, whereas in winter, the corresponding increases amount to 8.1 °C and 9.3 °C, respectively. Characteristic zones of minimum and maximum temperature values were identified at a depth of 26.75–28.50 m, which substantiates the necessity of thermal insulation within the range of 1.50–3.25 m to maintain system efficiency.
Further data processing in Wolfram Cloud enabled the derivation of second-order regression equations describing the relationships between the change in air flow temperature and effective thermal capacity with respect to inlet air temperature and air flow rate. This allowed the determination of optimal flow rates: 453.8 m³/h for the concentric and 455.2 m³/h for the U-shaped exchanger. Under these conditions, the thermal capacity of the concentric scheme ranges from 1052 to 1266 W depending on the season, while that of the U-shaped exchanger varies from 1235 to 1575 W.
The obtained results indicate that the U-shaped heat exchanger demonstrates 17–24 % higher efficiency compared to the concentric one, making it a promising solution for use in energy-efficient microclimate systems and providing a foundation for the development of adaptive control algorithms.

Keywords: vertical ground heat exchanger; concentric heat exchanger; U-shaped heat exchanger; numerical modeling; parameters; heat and mass transfer; heat capacity; energy efficiency; pneumatic losses; temperature; thermal power; microclimate systems.

List of references

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About journal

Topics of the journal:

131 - Applied Mechanics

132 - Materials Science

133 - Industry engineering

141 - Power engineering, electrical engineering and electromechanics

208 - Agricultural engineering

The magazine "Engineering, Energy, Transport AIC" is included in the list of scientific professional editions of Ukraine on technical sciences

(Category "Б", Order of the Ministry of Education and Science of Ukraine dated 02.07.2020 №886)

Old version of site: http://tetapk.vsau.edu.ua, http://techjournal.vsau.org

According to the decision of National Council of Television and Radio Broadcasting of Ukraine from 25.04.2024 No. 1337 the scientific journal «Engineering, Energy, Transport AIC» has the ID of the Media R30-05173.

The journal "Engineering, Energy, Transport AIC" is indexed according to the following databases and catalogs:

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Key information:
ISSN (print): 2520-6168
DOI: 10.37128/2520-6168

Certificate of state registration of mass media: No. 21906-11806 P dated 03/12/2016.

Founder of the journal: Vinnytsia National Agrarian University

Editor-in-chief: Olexii TOKARCHUK - Candidate of Technical Sciences, Associate Professor, VNAU (Vinnytsia)

Deputy Editor-in-Chief: Vitalii YAROPUD - Candidate of Technical Sciences, Associate Professor, VNAU (Vinnytsia)

Executive Secretary: Yuriy POLIEVODA - Candidate of Technical Sciences, Associate Professor, VNAU (Vinnytsia)

Members of the Editorial Board:

Oleg TSURKAN – Doctor of Technical Sciences, Full Professor, Vinnytsia National Agrarian University (Ukraine)

Volodymyr BULGAKOV – Doctor of Technical Sciences, Full Professor, Acad. NAAS, National University of Life and Environmental Sciences of Ukraine (Ukraine)

Rostislav ISKOVICH-LOTOTSKY  – Doctor of Technical Sciences, Full Professor, Vinnytsia National Technical University (Ukraine)

Yuliia SALENKO – Doctor of Technical Sciences, Full Professor, Kremenchuk Mykhailo Ostrohradskyi National University (Ukraine)

Igor KUPCHUK – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)    

Serhii SHARHORODSKYI – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)

Valerii HRANIAK – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)

Anatoly SPIRIN – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)

Olena SOLONA  – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)

Igor TVERDOKHLIB – Candidate of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (Ukraine)

Yaroslav IVANCHUK – Doctor of Technical Sciences, Full Professor, Vinnytsia National Technical University (Ukraine)

Foreign members of the editorial board

Jordan Todorov MAXIMOV – Doctor of Technical Sciences, Full Professor, Technical University of Gabrovo (Bulgaria)   

Audrius ŽUNDA – Ph.D., Associate Professor, Vytautas Magnus University (Kaunas, Lithuania)

 

Type of publication: journal

Kind of publication: scientific

Publication status: domestic

Year of foundation: 1997

Periodicity: 4 times per year

Volume: 18-20 conv. print. sheet (А4)

ISSN: 2520-6168 (print version), (online version)

Language of publication: (mixed languages) Ukrainian, English

The sphere of distribution and category of readers: national, foreign, faculty, scientists, entrepreneurs.

The periodical edition is included to the List of scientific professional publications of Ukraine on technical sciences, approved by order of the Ministry of Education and Science of Ukraine in 05.16.2016, No. 515.

The journal "Engineering, Energy, Transport AIC" is included in the "Catalog of Ukrainian Publications".

Subscription to the journal can be issued in each post office. The subscription index is 99720.

History of journal:

It was founded in 1997 under the title "Bulletin of the Vinnitsa State Agricultural Institute." According to the Decree of the Presidium of the Higher Attestation Commission of Ukraine of September 11, 1997, this publication received the status of a professional in which it is allowed to publish the main results of dissertation researches.

In 2001-2014 the journal published under the title “Collection of scientific works of Vinnytsia National Agrarian University. Series: Technical Sciences "(Certificate of State Registration of Mass Media KV No. 16644-5116 PR of 04/30/2010).

Since 2015 journal has title "Engineering, Energy, Transport AIC" (Certificate of State Registration of Mass Media No. 21906-11806 P dated 03/12/2016).