Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating
The numerical modeling of radiation and convective heat transfer through a double-chamber glass unit was carried out to substantiate the increase in the heat transfer resistance of this unit via the application of low-emission coatings to glass surfaces. In the space between the panes of a window wi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/5/1100 |
| _version_ | 1827319683549757440 |
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| author | Hanna Koshlak Borys Basok Borys Davydenko |
| author_facet | Hanna Koshlak Borys Basok Borys Davydenko |
| author_sort | Hanna Koshlak |
| collection | DOAJ |
| description | The numerical modeling of radiation and convective heat transfer through a double-chamber glass unit was carried out to substantiate the increase in the heat transfer resistance of this unit via the application of low-emission coatings to glass surfaces. In the space between the panes of a window without low-emission coatings, the amount of heat transferred via radiation exceeds the amount of heat transferred via thermal conductivity and convection. The question of the effect of low-emissivity coatings on reducing heat loss through a window has not yet been sufficiently studied. This problem is also not sufficiently reflected in the literature. In this regard, this paper presents the results of numerical simulation aimed at studying the effect of low-emissivity coatings on heat transfer through a double-chamber glass unit. Simulation is carried out by numerically solving a system of equations of fluid dynamics and energy for the air gap and glass. Boundary conditions of the fourth kind are set on the internal surfaces of the chambers, taking into account the radiation and conduction components of the total heat flux emanating from the glass. The results of modeling heat transfer through a glass unit with ordinary glass show that about 60% of the heat is transferred by radiation. Therefore, an effective measure to reduce heat loss through windows is to reduce the radiation component of the total heat flux by applying a low-emissivity coating to the internal surfaces of the glass unit. This allows for the reduction of the overall heat flux (and, accordingly, heat loss to the environment) by 20–34%, depending on the number of glass surfaces with such a coating. |
| first_indexed | 2024-04-25T00:31:46Z |
| format | Article |
| id | doaj.art-fd2839ab586143b681d9f88591b25a19 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-25T00:31:46Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-fd2839ab586143b681d9f88591b25a192024-03-12T16:43:20ZengMDPI AGEnergies1996-10732024-02-01175110010.3390/en17051100Heat Transfer through Double-Chamber Glass Unit with Low-Emission CoatingHanna Koshlak0Borys Basok1Borys Davydenko2Department of Sanitary Engineering, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego, 7, 25-314 Kielce, PolandDepartment of Thermophysical Basics of Energy-Saving Technologies, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, 2a, Marii Kapnist (Zhelyabova) Str., 03057 Kyiv, UkraineDepartment of Thermophysical Basics of Energy-Saving Technologies, Institute of Engineering Thermophysics of National Academy of Sciences of Ukraine, 2a, Marii Kapnist (Zhelyabova) Str., 03057 Kyiv, UkraineThe numerical modeling of radiation and convective heat transfer through a double-chamber glass unit was carried out to substantiate the increase in the heat transfer resistance of this unit via the application of low-emission coatings to glass surfaces. In the space between the panes of a window without low-emission coatings, the amount of heat transferred via radiation exceeds the amount of heat transferred via thermal conductivity and convection. The question of the effect of low-emissivity coatings on reducing heat loss through a window has not yet been sufficiently studied. This problem is also not sufficiently reflected in the literature. In this regard, this paper presents the results of numerical simulation aimed at studying the effect of low-emissivity coatings on heat transfer through a double-chamber glass unit. Simulation is carried out by numerically solving a system of equations of fluid dynamics and energy for the air gap and glass. Boundary conditions of the fourth kind are set on the internal surfaces of the chambers, taking into account the radiation and conduction components of the total heat flux emanating from the glass. The results of modeling heat transfer through a glass unit with ordinary glass show that about 60% of the heat is transferred by radiation. Therefore, an effective measure to reduce heat loss through windows is to reduce the radiation component of the total heat flux by applying a low-emissivity coating to the internal surfaces of the glass unit. This allows for the reduction of the overall heat flux (and, accordingly, heat loss to the environment) by 20–34%, depending on the number of glass surfaces with such a coating.https://www.mdpi.com/1996-1073/17/5/1100double-chamber windowsnatural convectionradiationheat transfer resistancelow-emission coating |
| spellingShingle | Hanna Koshlak Borys Basok Borys Davydenko Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating Energies double-chamber windows natural convection radiation heat transfer resistance low-emission coating |
| title | Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating |
| title_full | Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating |
| title_fullStr | Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating |
| title_full_unstemmed | Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating |
| title_short | Heat Transfer through Double-Chamber Glass Unit with Low-Emission Coating |
| title_sort | heat transfer through double chamber glass unit with low emission coating |
| topic | double-chamber windows natural convection radiation heat transfer resistance low-emission coating |
| url | https://www.mdpi.com/1996-1073/17/5/1100 |
| work_keys_str_mv | AT hannakoshlak heattransferthroughdoublechamberglassunitwithlowemissioncoating AT borysbasok heattransferthroughdoublechamberglassunitwithlowemissioncoating AT borysdavydenko heattransferthroughdoublechamberglassunitwithlowemissioncoating |