Ayah Radwan; Mostafa Mohamed Ahmed · 10.21608/msaeng.2023.302698 https://doi.org/10.21608/msaeng.2023.302698
MSA Engineering Journal
Improving thermal performance and air flow inside the solar chimney by CFD simulation Ayah Radwan; Mostafa Mohamed Ahmed University buildings require a study environment prepared for students thathelps improve student concentration and academic achievement, as the mostimportant thing that may help improve thermal comfort is sufficient ventilation ofthe space and an appropriate temperature. Solar chimneys play a major role inimproving thermal comfort for university spaces. The research dealt with the designof eight Solar chimneys on the southern facade of a classroom in the universitycampus in Sohag, Arab Republic of Egypt, to achieve the maximum indoor airvelocity and the lowest temperature during the summer, with a special focus onthermal comfort for students, as the ANSYS program was used to simulate andanalyse air movement, fluid flow, temperature distribution, and electromagneticefficiency, and the study of other effects over time. A 3D model of the hall wascreated using Solid Work, and a solar chimney was proposed using PCM panels toachieve the best passive ventilation. First, the CFD numerical analyses wereperformed within the ANSYS program to test the best solar chimney dimensionsand compare the results with field measurements. (DOE) experiments wereconducted on two fixed dimensions with chimney widths 20 cm and 40 cm, withtesting the chimney entrance openings of 20 cm x 20 cm and 40 cm x 40 cm andtesting the internal temperature and air velocity in the hall over the study months insummer and winter and understanding the mechanism. The physical phenomenonof atmospheric buoyancy. The experiments also included the design of a solarchimney with a 45-degree inclined roof attached to a runway without consideringthe humidity factor. for the effect of wind speed in a vacuum with a deviation (RMS)of 0.8% between the two values. Runway temperatures were reduced by 2.5°C by a solar chimney and results of an improved solar chimney design to enhance indoorair movement, optimization results also showed that maximum indoor air velocityin the runway area is achieved by using a 20x80 chimney with 20x20 void andopening western windows in this case study. A solar panel with a height of 4 meters,a width of 0.8 meters, an inclination of 45 degrees, and an air gap of 0.2 meters.The proposed solar chimney and its advantages deserve further research. Based onthis innovative concept, the solar chimney on the south facade can be redesigned,PCM panels assembled, the chimney width changed and the number of air intakeholes in the chimney increased to form an efficient solar chimney, to serve aspassive ventilation without much cost and make full use of solar energy., thenreaching the maximum internal wind speed of the vacuum achieving thermalcomfort by changing several parameters of the chimney.
Building ventilation
Numerical / CFD
2023
MSA Engineering Journal
yes
2023-03-01 12:00:00 00002248
improving thermal performance and air flow inside the solar chimney by cfd simulation
2023
MSA Engineering Journal
Ayah Radwan; Mostafa Mohamed Ahmed
10.21608/msaeng.2023.302698
Abstract
University buildings require a study environment prepared for students thathelps improve student concentration and academic achievement, as the mostimportant thing that may help improve thermal comfort is sufficient ventilation ofthe space and an appropriate temperature. Solar chimneys play a major role inimproving thermal comfort for university spaces. The research dealt with the designof eight Solar chimneys on the southern facade of a classroom in the universitycampus in Sohag, Arab Republic of Egypt, to achieve the maximum indoor airvelocity and the lowest temperature during the summer, with a special focus onthermal comfort for students, as the ANSYS program was used to simulate andanalyse air movement, fluid flow, temperature distribution, and electromagneticefficiency, and the study of other effects over time. A 3D model of the hall wascreated using Solid Work, and a solar chimney was proposed using PCM panels toachieve the best passive ventilation. First, the CFD numerical analyses wereperformed within the ANSYS program to test the best solar chimney dimensionsand compare the results with field measurements. (DOE) experiments wereconducted on two fixed dimensions with chimney widths 20 cm and 40 cm, withtesting the chimney entrance openings of 20 cm x 20 cm and 40 cm x 40 cm andtesting the internal temperature and air velocity in the hall over the study months insummer and winter and understanding the mechanism. The physical phenomenonof atmospheric buoyancy. The experiments also included the design of a solarchimney with a 45-degree inclined roof attached to a runway without consideringthe humidity factor. for the effect of wind speed in a vacuum with a deviation (RMS)of 0.8% between the two values. Runway temperatures were reduced by 2.5°C by a solar chimney and results of an improved solar chimney design to enhance indoorair movement, optimization results also showed that maximum indoor air velocityin the runway area is achieved by using a 20x80 chimney with 20x20 void andopening western windows in this case study. A solar panel with a height of 4 meters,a width of 0.8 meters, an inclination of 45 degrees, and an air gap of 0.2 meters.The proposed solar chimney and its advantages deserve further research. Based onthis innovative concept, the solar chimney on the south façade can be redesigned,PCM panels assembled, the chimney width changed and the number of air intakeholes in the chimney increased to form an efficient solar chimney, to serve aspassive ventilation without much cost and make full use of solar energy., thenreaching the maximum internal wind speed of the vacuum achieving thermalcomfort by changing several parameters of the chimney.
Abstract by the authors, reproduced under the CC BY 4.0 licence. Original publication via the link below.
Open source
PDF (open access)