Abstract
In Oman, air conditioning is required in public classrooms to ensure thermally comfortable conditions for users, considering the harsh hot climate. In general, air conditioning is provided by conventional mechanical systems, such as split units that consume a considerable amount of energy. Besides the environmental consequences, this practice takes a significant portion of the governmental budget, as public-school operation cost is funded by the government. Increasing the thermostat setting combined with raising air velocity is promising in maintaining thermally comfortable classrooms with reduced cooling energy. Increasing air velocity is possible by ventilation systems, including the stratum system, where thermal comfort is achieved by directing the airstream toward the upper part of the human body. This paper reports the findings of numerical simulations using STAR CCM+ , a Computational Fluid Dynamics (CFD) software. A numerical model of a typical classroom was generated in STAR CCM+ and was then validated using experimental data conducted for an actual classroom. The validated model was utilized to explore the effect of applying 15 ventilation scenarios, including a stratum ventilation system. The results showed that the conventional air conditioning systems achieved thermal comfort at several spots within the domain, but have a risk of the thermal draft. On the other hand, the stratum ventilation system achieved better thermal comfort at relatively higher air temperature compared to the conventional air conditioning systems. The results inferred that the stratum system might need lower energy consumption than the traditional cooling system.
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References
CEN-CR 1752—Ventilation for buildings—Design criteria for the indoor environment | Engineering360. https://standards.globalspec.com/std/1227480/CR%201752 (Accessed 13 Jan 2022)
da Ferreira AMC, Cardoso M (2014) Indoor air quality and health in schools. J Bras Pneumol 40:259–268. https://doi.org/10.1590/S1806-37132014000300009
Cheng Y, Lin Z, Fong AML (2015) Effects of temperature and supply airflow rate on thermal comfort in a stratum-ventilated room. Build Environ 92:269–277. https://doi.org/10.1016/j.buildenv.2015.04.036
Haverinen-Shaughnessy U, Shaughnessy RJ, Cole EC, Toyinbo O, Moschandreas DJ (2015) An assessment of indoor environmental quality in schools and its association with health and performance. Build Environ 93:35–40. https://doi.org/10.1016/j.buildenv.2015.03.006
Kayne A, Agarwal R (2013) Computational fluid dynamics (CFD) modeling of mixed convection flows in building enclosures. Int J Energy Environ 4. https://doi.org/10.1115/ES2013-18026
Lin Z (2011) Effective draft temperature for evaluating the performance of stratum ventilation. Build Environ 46(9):1843–1850. https://doi.org/10.1016/j.buildenv.2011.03.005
Lin Z, Yao T, Chow TT, Fong KF, Chan LS (2011) Performance evaluation and design guidelines for stratum ventilation. Build Environ 46(11):2267–2279. https://doi.org/10.1016/j.buildenv.2011.05.006
Sørensen DN, Voigt LK (2003) Modelling flow and heat transfer around a seated human body by computational fluid dynamics. Build Environ 38(6):753–762. https://doi.org/10.1016/S0360-1323(03)00027-1
Tian L, Lin Z, Wang Q (2011) Experimental investigation of thermal and ventilation performances of stratum ventilation. Build Environ 46:1309–1320. https://doi.org/10.1016/j.buildenv.2011.01.002
Zabalza Bribián I, Valero Capilla A, Aranda Usón A (2011) Life cycle assessment of building materials: comparative analysis of energy and environmental impacts and evaluation of the eco-efficiency improvement potential. Build Environ 46(5):1133–1140. https://doi.org/10.1016/j.buildenv.2010.12.002
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Khan, H.M., Al-Saadi, S., Al-Hashim, A., Al-Khatri, H. (2023). Numerical Analysis of Two Air Conditioning Systems for Thermal Comfort in School Classrooms in Oman: Stratum Versus DX Split Systems. In: Wang, L.L., et al. Proceedings of the 5th International Conference on Building Energy and Environment. COBEE 2022. Environmental Science and Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-9822-5_16
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DOI: https://doi.org/10.1007/978-981-19-9822-5_16
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