EVALUATION OF THE EFFICIENCY OF USING THE THERMAL POTENTIAL OF THE ENVIRONMENT AND THE TOP LAYERS OF THE LAND OF UKRAINE

  • Yu. Morozov Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20А Hnata Khotkevycha St., Kyiv, Ukraine. http://orcid.org/0000-0003-1632-9735
  • D. Chalaev Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20A, Hnata Hotkevycha St., Kyiv, Ukraine. Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine, 03057, 2a, Maria Kapnist, St., Kyiv, Ukraine. http://orcid.org/0000-0002-5154-4257
  • N. Nikolaievska Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20А Hnata Khotkevycha St., Kyiv, Ukraine. http://orcid.org/0000-0002-9997-4627
  • M. Dobrovolskyi Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine 03057, Kyiv, st. Maria Kapnist (Zhelyabova), 2a http://orcid.org/0000-0001-9140-5158
Keywords: air energy potential, upper layers of the еarth, heat pumps, energy efficiency.

Abstract

An assessment of the effectiveness of the combined use of low-potential soil heat and atmospheric air for the operation of a heat pump heat supply unit has been carried out. The analysis of the main provisions of the EU regulatory documents and legislative acts of Ukraine in terms of attributing heat pumps to equipment that uses renewable energy sources and choosing the criterion for such attribution. The minimum permissible value of the average calculated seasonal efficiency is considered. The influence of the duration of air temperatures of various gradations on the heat pump heat output is analyzed and the time intervals for the effective operation of each of the low-potential sources are determined. To increase the efficiency of the two-circuit heat pump system, a scheme for extracting low-potential heat using a soil heat pipe and an air heat exchanger based on a two-phase gravitational thermosyphon is proposed. The initial data and assumptions for assessing the thermal potential of the upper layers of the Earth, which can be used for geothermal heat supply using heat pumps, are considered. The comparison of the energy characteristics of the geothermal and air heat pump during their autonomous and combined operation throughout the year in the climatic conditions of Kiev is carried out and it is shown that the combined use of low-potential heat of atmospheric air and soil allows to increase the annual heat output of the heat pump system by 1.2 times. Based on the studies carried out, it has been established that the advantage of air as a heat carrier is that air heat pumps can operate almost everywhere and do not require a low-temperature circuit. A promising way to increase the efficiency of a heat pump with an annual cycle of its operation is the combined use of low-potential heat of soil and air. The heat pump system with two energy sources provides high heat pump performance throughout the year and has a higher energy efficiency than traditional solutions. Bibl.11, tab.2, fig.4.

Author Biographies

Yu. Morozov, Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20А Hnata Khotkevycha St., Kyiv, Ukraine.

Morozov.jpgAuthor information: Head of the Department of Geothermal Energy of the Institute of Renewable Energy of the National Academy of Sciences of Ukraine, doctor of technical sciences, senior researcher.
Education: National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”.
Research area: renewable energy, geothermal energy, use of warm environment.
Publications: more than 160.

D. Chalaev, Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20A, Hnata Hotkevycha St., Kyiv, Ukraine. Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine, 03057, 2a, Maria Kapnist, St., Kyiv, Ukraine.

Chalaev1.pngAuthor information: Senior Researcher of the Department of Geothermal Energy of the Institute of Renewable Energy of NAS of Ukraine, Ph.D. (engineering). Leading Researcher of the Department of Heat and Mass Transfer in Disperse Systems of the Institute of Engineering Thermophysics of NAS of Ukraine.
Education: Moscow Technological Institute of Meat and Dairy Industry.
Research area: renewable energy sources, heat pumps, energy saving.
Publications: more than 100.

N. Nikolaievska, Institute of Renewable Energy of the National Academy of Sciences of Ukraine, 02094, 20А Hnata Khotkevycha St., Kyiv, Ukraine.

Nikolaievska.pngAuthor information: junior researcher of the department Institute of Renewable Energy of National Academy of Sciences of Ukraine.
Education: Vladimir Polytechnic Institute.
Research area: renewable energy; geothermal energy; use of warm environment.
Publications: more than 20.

M. Dobrovolskyi, Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine 03057, Kyiv, st. Maria Kapnist (Zhelyabova), 2a

dobrov.jpgAuthor information: postgraduate student of the Institute of  Engineering  Thermophysics of NAS of Ukraine
Education:Kyiv National University of Construction and Architecture.
Research area: renewable energy, use of warm environment, heat power engineering.
Publications: 3.

References

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Published
2020-12-28
How to Cite
Morozov, Y., Chalaev, D., Nikolaievska, N., & Dobrovolskyi, M. (2020). EVALUATION OF THE EFFICIENCY OF USING THE THERMAL POTENTIAL OF THE ENVIRONMENT AND THE TOP LAYERS OF THE LAND OF UKRAINE. Vidnovluvana Energetika, (4(63), 80-88. https://doi.org/10.36296/1819-8058.2020.4(63).80-88