Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD

Hande Ufat

doi:10.29130/dubited.1846844

EN TR

Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD

Abstract

This paper presents, the distribution of indoor air temperature and velocity in an office environment under different inlet conditions using Computational Fluid Dynamics (CFD). The office, with dimensions of 8 × 5 × 3 m, was cooled by a wall-mounted split air conditioner. The analyses were performed using the k-ɛ turbulence model, with the split air conditioner's inlet temperature set to 18, 20, and 22°C and its velocity set to 0.5, 1, and 2 m/s. The analysis included the heat emitted by five people, five computers, and lamps in the office. The results indicate that increasing inlet velocity leads to a more uniform temperature distribution and lower average indoor temperatures. At an inlet velocity of 0.5 m/s, insufficient air mixing resulted in localized temperature variations, while at 2 m/s, local air velocities in certain regions exceeded 0.25 m/s. According to ASHRAE Standard 55, this value represents the upper limit for acceptable air velocity in occupied zones and may lead to draft risk. At an inlet velocity of 1 m/s, a more balanced distribution of temperature and air velocity was achieved, with indoor temperatures generally within the recommended range of 22–26°C and air velocity remaining mostly below the threshold value. The findings demonstrate that inlet air conditions significantly influence indoor air distribution characteristics. Among the evaluated cases, an inlet velocity of 1 m/s provided the most favorable balance between temperature distribution and air velocity within the investigated conditions.

Keywords

Temperature and air velocity distribution, Split air conditioning, Cooling, CFD

Supporting Institution

This research received no external funding.

Ethical Statement

This study does not involve human or animal participants. All procedures followed scientific and ethical principles, and all referenced studies are appropriately cited.

Thanks

The author do not wish to acknowledge any individual or institution.

References

American Society of Heating, Refrigerating and Air-Conditioning Engineers. (2020). Thermal environmental conditions for human occupancy (ANSI/ASHRAE Standard No. 55-2020). ASHRAE.
Awbi, H. B. (2003). Ventilation of buildings (2nd ed.). Taylor & Francis.
Baharudin, N., Manshoor, B., Didane, D. H., Zaman, I., Mazlan, M. A. I., Saddun, A. H. S., Naharazmi, M. N. S., Hasan, M. A. A., Sam, M. F. M., Saleman, A. R., & Kumar, S. (2024). Optimization of the air conditioning system for an unoccupied office building using split unit and double-panel radiator. Journal of Complex Flow, 6(2), 38–44.
Catalina, T., Virgone, J., & Kuznik, F. (2009). Evaluation of thermal comfort using combined CFD and experimentation study in a test room equipped with a cooling ceiling. Building and Environment, 44(8), 1740–1750. https://doi.org/10.1016/j.buildenv.2008.11.015
Chen, Q. (2009). Ventilation performance prediction for buildings: A method overview and recent applications. Building and Environment, 44(4), 848–858. https://doi.org/10.1016/j.buildenv.2008.05.025
Fan, M., Fu, Z., Wang, J., Wang, Z., Suo, H., Kong, X., & Li, H. (2022). A review of different ventilation modes on thermal comfort, air quality and virus spread control. Building and Environment, 212, Article 108831. https://doi.org/10.1016/j.buildenv.2022.108831
Fanger, P. O. (1970). Thermal comfort: Analysis and applications in environmental engineering. Danish Technical Press.
Ganesh, G. A., Sinha, S. L., Verma, T. N., & Dewangan, S. K. (2024). Energy consumption and thermal comfort assessment using CFD in a naturally ventilated indoor environment under different ventilations. Thermal Science and Engineering Progress, 50, Article 102557. https://doi.org/10.1016/j.tsep.2024.102557
Hatif, I. H., Hariri, A., & Idris, A. F. A. (2020). CFD analysis on effect of air inlet and outlet location on air distribution and thermal comfort in small office. CFD Letters, 12(3), 66–77. https://doi.org/10.37934/cfdl.12.3.6677
Horikiri, K., Yao, Y., & Yao, J. (2015). Numerical optimisation of thermal comfort improvement for indoor environment with occupants and furniture. Energy and Buildings, 88, 303–315. https://doi.org/10.1016/j.enbuild.2014.12.015

Höfert, O., & Danielak, M. (2021). Comparison of three different ventilation approaches for an open office space regarding pathogen distribution and thermal comfort by CFD. ASHRAE Transactions, 127(1), Article VC-21-007.
Huang, Z., Li, Q., He, Y., Ding, X., Dong, Y., & Gao, W. (2025). Coupled heat and mass transfer analysis for indoor air quality and thermal comfort in naturally ventilated offices. Applied Thermal Engineering, 269, Article 126019. https://doi.org/10.1016/j.applthermaleng.2025.126019
Lu, Y. C., Chen, C. W., Gong, X. J., Lee, K. R., & Tseng, C. J. (2021). CFD simulations for thermal comfort and energy saving. In Proceedings of the IEEE/ACIS 22nd International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD) (pp. 167–170). IEEE.
Mazlan, M. A. I., Saddun, A. H. S., Naharazmi, M. N. S., Hasan, M. A. A., Sam, M. F. M., Didane, D. H., & Manshoor, B. (2024). CFD simulation of air conditioning system of an office. Journal of Design for Sustainable and Environment, 6(2), 48–54.
Mora-Pérez, M., Guillen-Guillamón, I., & López-Jiménez, P. A. (2017). A CFD study for evaluating the effects of natural ventilation on indoor comfort conditions. AIMS Environmental Science, 4(2), 289–309. https://doi.org/10.3934/environsci.2017.2.289
Muhamad, S. J., Hamad, H. M., Maheadeen, S. M., & Ahmed, L. R. (2022). An analysis of air flow and temperature distribution using computational fluid dynamics (CFD). NeuroQuantology, 20(6), 4932–4942.
Nielsen, P. V. (1998). The selection of turbulence models for prediction of room airflow. ASHRAE Transactions, 104(Part 1B), 1119–1127.
Omerzo, B., Zakula, T., & Glicksman, L. R. (2025). Experimental and CFD study of air distribution system and airflow rate impact on airborne transmission. Building and Environment, 271, Article 112588. https://doi.org/10.1016/j.buildenv.2025.112588
Othayq, M. M. (2025). CFD investigation on the thermal comfort for an office room. Buildings, 15(15), Article 2802. https://doi.org/10.3390/buildings15152802
Pulat, E., & Yuce, B. E. (2021). A parametric study on the effect of blowing parameters of split-type air conditioners on thermal comfort and ventilation. Heat Transfer Research, 52(15), 63–76. https://doi.org/10.1615/HeatTransRes.2021039762
Tang, J., Liu, Y., Du, H., Lan, L., Sun, Y., & Wu, J. (2021). The effects of portable cooling systems on thermal comfort and work performance in a hot environment. Building Simulation, 14(6), 1667–1683. https://doi.org/10.1007/s12273-021-0766-y
Ufat, H., Kaynakli, O., Yamankaradeniz, N., & Yamankaradeniz, R. (2017). Three-dimensional air distribution analysis of different outflow typed operating rooms at different inlet velocities and room temperatures. Advances in Mechanical Engineering, 9(7), Article 1687814017707414. https://doi.org/10.1177/1687814017707414
Wróblewski, A., Macek, A., Banasiewicz, A., Gola, S., Zawiślak, M., & Janicka, A. (2023). CFD analysis of the forced airflow and temperature distribution in the air-conditioned operator’s cabin of the stationary rock breaker in underground mine under increasing heat flux. Energies, 16(9), Article 3814. https://doi.org/10.3390/en16093814
Zhang, F., & Ryu, Y. (2021). Simulation study on indoor air distribution and indoor humidity distribution of three ventilation patterns using computational fluid dynamics. Sustainability, 13(7), Article 3630. https://doi.org/10.3390/su13073630
Zhang, Z., Gao, Y., Nie, S., Tian, Y., Li, C., Gao, R., Yin, K., Liu, Y., Liu, B. and & Li, H. (2022). Study on the recommended placement and air distribution of split floor-standing room air conditioners. International Journal of Architectural Engineering Technology, 9, 1–17. https://doi.org/10.15377/2409-9821.2022.09.1

Details

Primary Language

English

Subjects

Numerical Methods in Mechanical Engineering

Journal Section

Research Article

Authors

Hande Ufat ^*
0000-0001-8350-245X
Türkiye

Publication Date

July 24, 2026

Submission Date

December 22, 2025

Acceptance Date

May 11, 2026

Published in Issue

Year 2026 Volume: 14 Number: 3

DOI

https://doi.org/10.29130/dubited.1846844

IZ

https://izlik.org/JA54ZM72CS

APA

Ufat, H. (2026). Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD. Duzce University Journal of Science and Technology, 14(3), 786-797. https://doi.org/10.29130/dubited.1846844

AMA

1.Ufat H. Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD. DUBİTED. 2026;14(3):786-797. doi:10.29130/dubited.1846844

Chicago

Ufat, Hande. 2026. “Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD”. Duzce University Journal of Science and Technology 14 (3): 786-97. https://doi.org/10.29130/dubited.1846844.

EndNote

Ufat H (July 1, 2026) Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD. Duzce University Journal of Science and Technology 14 3 786–797.

IEEE

[1]H. Ufat, “Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD”, DUBİTED, vol. 14, no. 3, pp. 786–797, July 2026, doi: 10.29130/dubited.1846844.

ISNAD

Ufat, Hande. “Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD”. Duzce University Journal of Science and Technology 14/3 (July 1, 2026): 786-797. https://doi.org/10.29130/dubited.1846844.

JAMA

1.Ufat H. Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD. DUBİTED. 2026;14:786–797.

MLA

Ufat, Hande. “Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD”. Duzce University Journal of Science and Technology, vol. 14, no. 3, July 2026, pp. 786-97, doi:10.29130/dubited.1846844.

Vancouver

1.Hande Ufat. Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD. DUBİTED. 2026 Jul. 1;14(3):786-97. doi:10.29130/dubited.1846844

Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD

Investigation of Indoor Air Temperature and Velocity Distribution in an Office at Different Inlet Conditions Using CFD

Abstract

Keywords

Supporting Institution

Ethical Statement

Thanks

CFD Kullanılarak Farklı Giriş Koşullarında Bir Ofiste İç Mekan Hava Sıcaklığı ve Hız Dağılımının İncelenmesi

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