Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner | ||
| Engineering and Technology Journal | ||
| Article 2, Volume 38, 9A, September 2020, Pages 1257-1275 PDF (1.85 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.v38i9A.875 | ||
| Authors | ||
| Wisam M. Mareed* 1; Hasanen M. Hussen2 | ||
| 1University of Technology, Mechanical engineering, Baghdad, Iraq, | ||
| 2University of technology, Mechanical engineering, Baghdad, Iraq, | ||
| Abstract | ||
| Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported. | ||
| Keywords | ||
| Carbon dioxide (CO2); Computational fluid dynamics CFD; Indoor air quality (IAQ); 4-way cassette air-conditioner; ventilation | ||
| References | ||
|
[1] A. Novoselac, ―Comparison of air exchange efficiency and contaminant removal effectiveness as iaq indices, ‖ ASHRAE Annual Meeting vol. 109, no. 4663, pp. 1–11, 2003. [2] K.C Noh, JS Jang and MD Oh , I. Engineering, ―Indoor air quality and thermal comfort in the lecture room with 4-way cassette air-conditioner and ventilation system, ‖ Indoor Air 2005,University of Seoul, 103-743, Korea 2005. [3] K. Noh, C. Han, and M. Oh, ―Effect of the airflow rate of a ceiling type air-conditioner on ventilation effectiveness in a lecture room,‖ University of Seoul, refrigeration, vol. 31, pp. 180–188, 2008. [4] D. Houri, Y. Kanazawa, I. Morioka, and K. Matsumoto, ―Indoor air quality of Tottori University lecture rooms and measures for decreasing carbon dioxide concentrations,‖ Yonago Acta Med., vol. 52, no. 2, pp. 77–84, 2009. [5] A. Simone and B. W. Olesen, ―Experimental evaluation of air distribution in mechanically ventilated residential rooms : Thermal comfort and ventilation effectiveness, ‖ Energy and Buildings vol. 60, pp. 28–37, 2013. [6] N. Mahyuddin, H. B. Awbi, and M. Alshitawi, ―The spatial distribution of carbon dioxide in rooms with particular application to classrooms,‖ Indoor Built Environ., vol. 23, no. 3, pp. 433–448, 2014. [7] G. Cao, Guangyu, Awbi, HazimYao, RunmingFan, YunqingSirén, KaiKosonen, Risto Zhang, Jensen., ―ASHRAE STANDARD,‖ Build. Environ,pp.1689-1699,vol.53, 2014. [8] Z. Popio, Z. Buli, and A. Buli, ―Experimentally validated CFD analysis on sampling region determination of average indoor carbon dioxide concentration in occupied space, ‖ Building and Environment, vol. 72, 2014. [9] E. Procedia, ― A numerical simulation of air distribution in an office room ventilated by 4-way cassette air-conditioner,‖ Energy Procedia, vol. 105, pp. 2506–2511, 2017. [10] S. J. Emmerich, A. K. Persily, S. J. Emmerich, and A. K. Persily, ―State-of-the-art review of co 2 demand-controlled ventilation technology and application, ‖State-of-the-Art Review of CO 2 Demand Controlled Ventilation Technology and Application, Nistir, Vol. 6729, pp.1-41,2001. [11] N. Mahyuddin and H. B. Awbi, ―A review of CO2 measurement procedures in ventilation research,‖ Int. J. Vent., Vol. 10, No. 4, pp. 353–370, 2012. [12] John D Anderson, ―Computational fluid dynamics,‖ Comput. Fluid Dyn,Vol.2, pp. 15–51, 2009. [13] Miller, E.A. W. Documentation, ―ANSYS Workbench Documentation, ANSYS, Inc. and ANSYS Europe, ‖ Ltd. are UL registered ISO 9001:2000 Companies,vol.10, pp.1-1192,2005. [14] S. C. Turner et al., ―ASHRAE STANDARD thermal environmental conditions for human occupancy 55-2004,‖ANSI, vol. 4723,pp.1-32, 2008. [15] S. Dobek, Fluid dynamics and the navier-stokes equation Cmsc498a: spring ’12 semester, 2012. [16] A. A. B. Jr and A. Arthur, Rules of Thumb HVAC ,‖ McGraw-Hill Companies, ISBN 0-07-136129-4" 2000 [17] S. A. G. Ali. ―Study the effect of upstream riblet on wing-wall junction,‖ University of Technology. Mechanical Engineering Department , MSc Thesis, pp.20- 108, 2011. [18] Q. H. Hassan, S. T. Ahmed, and A. Mahdi, ―Numerical Simulation of Air Velocity and Temperature Distribution in an Office Room ventilated by Displacement Ventilation System,‖ Energy Procedia, Vol. 5, No. 4, pp. 32–42, 2014. [19] Sandberg, M., 1984, The multi-chamber theory reconsidered from the viewpoint of air quality studies: ,‖ Building and Environment, Vol. 19, p. 221-233. [20] L. Koufi, Z. Younsi, Y. Cherif, H. Naji, and M. El Ganaoui, ―A numerical study of indoor air quality in a ventilated room using different strategies of ventilation,‖ Mech. Ind., Vol. 18, No. 2, 2017 | ||
|
Statistics Article View: 305 PDF Download: 392 |
||