Mitigating solar heat gain through windows of buildings by reflective films: A case study in Iraq

N.A.

Article Details

Mitigating solar heat gain through windows of buildings by reflective films: A case study in Iraq

Authors:

N.A.

Publisher:

Yildiz Technical University

Main Topics:

Fluid Mechanics and Thermal Engineering (Other)

Journal:

Journal of Thermal Engineering Vol.11 Issue 2, pp.357-376

Document Type:

Article

Publication Date:

3/2025

Document Language:

English

Document ID (Org No.):

2001344245

pISSN:

2148-7847

Keywords:

Abstract:

 The current work evaluates thermally the role of shading films in mitigating the heat gain through regular glazing unit, as an energy saving application. The study used experimental data collected in an actual building, and theoretical models used to calculate the heat gain and cooling load. The study served several reflective films with different colors, manners and shading rates. The measurements included the values of temperature indoor and surface, solar radiation and light intensity. The results manifested the potential of these sheets to eliminate the solar radiation by more than 70, and decrease the heat gain via up to 50 in comparison with the conventional clear window. A film with medium shading rate 50 reduces the heat gain through the window up to 40, which reduces the corresponding energy consumption by 290, 400, 480 and 540 W, in cases of using gray, red, black and retro-reflective films, respectively. This will save the energy by 3.7, 5.1, 6.2 and 6.9. Furthermore, the use of very dark films leads to undesired rise in the internal surface temperature, as well as weak light indoor. The use of retro-films elucidates suitable light indoor and doesnt show that rise in the surface temperature owing to the ability in reflecting the rays right back without diffusion. The novelty is presenting findings of a realistic and actual investigation for the effect of shading films in the reduction of heat passed through the glass of a building in an extreme hot area. However, the study can be considered as an effective passive technique to withstand the overheating due to global warming and assigned within adaptation and mitigation policy.

 The current work evaluates thermally the role of shading films in mitigating the heat gain through regular glazing unit, as an energy saving application. The study used experimental data collected in an actual building, and theoretical models used to calculate the heat gain and cooling load. The study served several reflective films with different colors, manners and shading rates. The measurements included the values of temperature indoor and surface, solar radiation and light intensity. The results manifested the potential of these sheets to eliminate the solar radiation by more than 70, and decrease the heat gain via up to 50 in comparison with the conventional clear window. A film with medium shading rate 50 reduces the heat gain through the window up to 40, which reduces the corresponding energy consumption by 290, 400, 480 and 540 W, in cases of using gray, red, black and retro-reflective films, respectively. This will save the energy by 3.7, 5.1, 6.2 and 6.9. Furthermore, the use of very dark films leads to undesired rise in the internal surface temperature, as well as weak light indoor. The use of retro-films elucidates suitable light indoor and doesnt show that rise in the surface temperature owing to the ability in reflecting the rays right back without diffusion. The novelty is presenting findings of a realistic and actual investigation for the effect of shading films in the reduction of heat passed through the glass of a building in an extreme hot area. However, the study can be considered as an effective passive technique to withstand the overheating due to global warming and assigned within adaptation and mitigation policy.

 The current work evaluates thermally the role of shading films in mitigating the heat gain through regular glazing unit, as an energy saving application. The study used experimental data collected in an actual building, and theoretical models used to calculate the heat gain and cooling load. The study served several reflective films with different colors, manners and shading rates. The measurements included the values of temperature indoor and surface, solar radiation and light intensity. The results manifested the potential of these sheets to eliminate the solar radiation by more than 70, and decrease the heat gain via up to 50 in comparison with the conventional clear window. A film with medium shading rate 50 reduces the heat gain through the window up to 40, which reduces the corresponding energy consumption by 290, 400, 480 and 540 W, in cases of using gray, red, black and retro-reflective films, respectively. This will save the energy by 3.7, 5.1, 6.2 and 6.9. Furthermore, the use of very dark films leads to undesired rise in the internal surface temperature, as well as weak light indoor. The use of retro-films elucidates suitable light indoor and doesnt show that rise in the surface temperature owing to the ability in reflecting the rays right back without diffusion. The novelty is presenting findings of a realistic and actual investigation for the effect of shading films in the reduction of heat passed through the glass of a building in an extreme hot area. However, the study can be considered as an effective passive technique to withstand the overheating due to global warming and assigned within adaptation and mitigation policy.

 The current work evaluates thermally the role of shading films in mitigating the heat gain through regular glazing unit, as an energy saving application. The study used experimental data collected in an actual building, and theoretical models used to calculate the heat gain and cooling load. The study served several reflective films with different colors, manners and shading rates. The measurements included the values of temperature indoor and surface, solar radiation and light intensity. The results manifested the potential of these sheets to eliminate the solar radiation by more than 70, and decrease the heat gain via up to 50 in comparison with the conventional clear window. A film with medium shading rate 50 reduces the heat gain through the window up to 40, which reduces the corresponding energy consumption by 290, 400, 480 and 540 W, in cases of using gray, red, black and retro-reflective films, respectively. This will save the energy by 3.7, 5.1, 6.2 and 6.9. Furthermore, the use of very dark films leads to undesired rise in the internal surface temperature, as well as weak light indoor. The use of retro-films elucidates suitable light indoor and doesnt show that rise in the surface temperature owing to the ability in reflecting the rays right back without diffusion. The novelty is presenting findings of a realistic and actual investigation for the effect of shading films in the reduction of heat passed through the glass of a building in an extreme hot area. However, the study can be considered as an effective passive technique to withstand the overheating due to global warming and assigned within adaptation and mitigation policy.

Article Details

Mitigating solar heat gain through windows of buildings by reflective films: A case study in Iraq

Authors:

N.A.

Publisher:

Yildiz Technical University

Main Topics:

Fluid Mechanics and Thermal Engineering (Other)

Journal:

Journal of Thermal Engineering Vol.11 Issue 2, pp.357-376

Document Type:

Article

Publication Date:

3/2025

Document Language:

English

Document ID (Org No.):

2001344245

pISSN:

2148-7847

Cooling

Radiation

Retro-reflective

Shading

Window

Issues

Article Details

Mitigating solar heat gain through windows of buildings by reflective films: A case study in Iraq

Authors: N.A.

Publisher: Yildiz Technical University

Main Topics: Fluid Mechanics and Thermal Engineering (Other)

Journal: Journal of Thermal Engineering Vol.11 Issue 2, pp.357-376

Document Type: Article

Publication Date: 3/2025

Document Language: English

Document ID (Org No.): 2001344245

pISSN: 2148-7847

Cooling

Radiation

Retro-reflective

Shading

Window

Issues

Authors:

N.A.

Publisher:

Yildiz Technical University

Main Topics:

Fluid Mechanics and Thermal Engineering (Other)

Journal:

Journal of Thermal Engineering Vol.11 Issue 2, pp.357-376

Document Type:

Article

Publication Date:

3/2025

Document Language:

English

Document ID (Org No.):

2001344245

pISSN:

2148-7847