Experimental and numerical study for assessment indoor air quality by adopting mixing ventilation with different occupants' density in Iraq hot climates

Yıl 2024, Cilt: 10 Sayı: 2, 430 - 446, 22.03.2024

Atheer Hmaizah Sabr Alaa Abbas Mahdi Mohammed Wahhab Aljibory

https://doi.org/10.18186/thermal.1456666

Öz

In this research, thermal of level comfort and air quality indoor were examined for different numbers of persons (occupants’ density) within a (3m × 2.5m × 2.5 m) office room. The office room is equipped with mixing ventilation system, temperature and air speed (17°C) and (2.5 m/s) respectively. The results of experimental experiments and results were compared with computational fluid-dynamics (CFD) analysis utilizing the turbulent (RNG, k-epsilon) model on a thermal manikin that represents a person’s body in a standing and sitting and position. The experimental study focused on measuring the velocity, air temperature, and carbon dioxide (CO2) concentration in different areas indoor the room, in addition to taking measurements around the heat manikins and in the breathing area. When analyzing numerical data, thermal of level comfort was assessed by air diffusion of performance Index (ADPI), predicted of percentage dissatisfied (PPD), and predicted of mean vote (PMV). The results indicate that thermal comfort and indoor air quality decline with more persons. Where the values of (ADPI), (PPD) and (PMV) change from (76.55 %), (6.325 %) and (0.021) to (64.25 %), (10.412 %) and (0.52) respectively, when the number of persons in the room increased from (two persons) to (four persons).

Anahtar Kelimeler

Computational Fluid-Dynamics (CFD), Indoor Air Quality (IAQ), Mixing Ventilation (MV), Thermal COmfort, Occupied Density

Kaynakça

• [1] Wargocki P, Sundell J, Bischof W, Brundrett G, Fanger PO, Gyntelberg F, et al. Ventilation and health in non-industrial indoor environments: report from a European Multidisciplinary Scientific Consensus Meeting (EUROVEN). Indoor Air 2002;12:113–128. [CrossRef]
• [2] Wargocki P, Djukanovic R. Simulations of the potential revenue from investment in improved indoor air quality in an office building. ASHRAE Transactions 2005;111.
• [3] Bluyssen PM, de Oliveira Fernandes E, Groes L, Clausen G, Fanger PO, Valbjørn O, et al. European indoor air quality audit project in 56 office buildings. Indoor Air 1996;6:221–238. [CrossRef]
• [4] Saheb HA, Al-Amir QR. A comparative study of performance between two combined ventilation systems and their effect on indoor air quality and thermal comfort inside office rooms. IOP Conference Series: Mater Sci Engineer 2021;1095:012001. [CrossRef]
• [5] Awbi HB. Ventilation Systems: Design and Performance. Abingdon: Taylor and Francis; 2007. [CrossRef]
• [6] Reynders G, Saelens D. Numerical and experimental evaluation of ventilation in laboratories: A case study. Available at: file:///Users/kare2022/Downloads/Reynders,%20Saelens%20-%202011%20-%20NUMERICAL%20AND%20EXPERIMENTAL%20EVALUATION%20OF%20VENTILATION%20IN%20LABORATORIES%20A%20CASE%20STUDY.pdf. Accessed March 12, 2024.
• [7] Wang Z, Zhu Y, Wang F, Wang P, Shen C, Liu J, eds. Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019): Volume I: Indoor and Outdoor Environment. Berlin: Springer Nature; 2020. [CrossRef]
• [8] Xue K, Cao G, Liu M, Zhang Y, Pedersen C, Mathisen HM, et al. Experimental study on the effect of exhaust airflows on the surgical environment in an operating room with mixing ventilation. J Build Engineer 2020;32:101837. [CrossRef]
• [9] Shah Y, Kurelek JW, Peterson SD, Yarusevych S. Experimental investigation of indoor aerosol dispersion and accumulation in the context of COVID-19: Effects of masks and ventilation. Physics Fluids 2021;33:073315. [CrossRef]
• [10] ASHRAE. Fundamentals Handbook. 2013.
• [11] ASHRAE. HVAC Systems and Equipment (SI). Panel heating and cooling; 2012.
• [12] ASHRAE. Standard 55, Thermal environmental conditions for human occupancy. Atlanta; 2010.
• [13] Awbi HB. Ventilation for good indoor air quality and energy efficiency. Energy Procedia 2017;112:277–286. [CrossRef]
• [14] Shbeeb AA, Mahdi AA, Hussein AK. Effects of supply diffuser shape on air age and human comfort in an office with displacement ventilation and chilled ceiling system in hot and dry climate. IOP Conference Series: Mater Sci Engineer 2021;1067:012089. [CrossRef]
• [15] Fluent Inc. Fluent 6.3.26 User’s Guide. 2006.
• [16] Hussein JM, Farooq AH, Al-Amir QR, Hameed KH, Khafaji SOW. Entropy generation analysis of a natural convection inside a sinusoidal enclosure with different shapes of cylinders. Front Heat Mass Transf 2019;12:22. [CrossRef]
• [17] Mahdi AA, Jasim ZH. Experimental and numerical study of air flow diffusion and contaminants circulation in room ventilation related with Iraqi climate. Int J Mech Engineer Appl 2016;4:24–42. [CrossRef]
• [18] Bhagat RK, Wykes MD, Dalziel SB, Linden PF. Effects of ventilation on the indoor spread of COVID-19. J Fluid Mech 2020;903. [CrossRef]
• [19] Fluent ANSYS. ANSYS fluent theory guide 15.0. Canonsburg, PA: ANSYS; 2013. p. 33.
• [20] Awbi H. Ventilation of Buildings. 2nd ed. Abingdon: Taylor & Francis; 2008.
• [21] ASHRAE. Fundamentals Handbook. 2017.