Abstract
The objective of this work is to evaluate the quality of the zonal airflow predictions compared to those provided by computational fluid dynamics (CFD) tools for an isothermal airflow induced in a room by a linear ceiling diffuser. This comparative analysis was conducted for a typical rectangular office designed for two people, considering two different arrangements of obstacles within the room volume. The ventilation was provided by a four-way ceiling diffuser type with large aspect ratio slots, the outlet integrated into it, operating in a three-way mode with slot Reynolds number of 2700. As a result, the airflow was transitional or weakly turbulent. The airflow patterns obtained with the zonal models were first compared qualitatively with the CFD computations. A quantitative comparison based on the mean velocities at the interface of the zonal grid was then carried out. The characteristic features of the zonal predictions are shown and the limitations of the zonal and CFD approaches are discussed.
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References
Abadie MO, Blondeau P (2010). A new set of TRNSYS Types to model indoor airflow and air quality using the zonal approach. In: Proceedings of 7th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings (IAQVEC), Syracuse, NY, USA.
Abadie MO, De Camargo MM, Mendonça KC, Blondeau P (2012). Improving the prediction of zonal modeling for forced convection airflows in rooms. Building and Environment, 48: 173–182.
Abramovich GN (1963). The Theory of Turbulent Jets. Cambridge, USA: MIT Press.
Awbi HB, Setrak AA (1986). Numerical solution of ventilation air jet. In: Proceedings of 5th International Symposium on the Use of Computers for Environmental Engineering Related to Buildings, Bath, UK.
Axley JW (2001). Surface-drag flow relations for zonal modeling. Building and Environment, 36: 843–850.
Boukhris Y, Gharbi L, Ghrab-Morcos N (2009). Modeling coupled heat transfer and air flow in a partitioned building with a zonal model: Application to the winter thermal comfort. Building Simulation, 2: 67–74.
Chen Q, Xu W (1998). A zero-equation turbulence model for indoor airflow simulation. Energy and Building, 28: 137–144.
Chen YL, Wen J (2010). Comparison of sensor systems designed using multizone, zonal and CFD data for protection of indoor environments. Building and Environment, 45: 1061–1071.
Czelusniak T, Mendonça KC, Abadie MO (2009). Validation of the zonal method for the case of isothermal airflow in a rectangular cavity. In: Proceedings of 11th IBPSA International Conference, Glasgow, UK.
Daoud A, Galanis N (2008). Prediction of airflow patterns in a ventilated enclosure with zonal methods. Applied Energy, 85: 439–448.
EnergyPlus (2013). EnergyPlus Engineering Reference. Available: http://apps1.eere.energy.gov/buildings/energyplus/pdfs. Accessed 19 Apr. 2013.
Feustel HE (1999). COMIS—An international multizone air-flow and contaminant transport model. Energy and Buildings, 30: 3–18.
Ferziger JH, Peric M (2002). Computational methods for fluid dynamics, 3rd Edn. Berlin: Springer.
Griffith B, Chen Q (2003). A momentum-zonal model for predicting zone airflow and temperature distribution to enhance building load and energy simulation. HVAC&R Research, 9: 309–325.
Haghighat F, Lin Y, Megri AC (2001). Development and validation of a zonal model. Building and Environment, 36: 1039–1047.
Inard C, Bouia H, Dalicieux P (1996). Prediction of air temperature distribution in buildings with a zonal model. Energy and Buildingss, 24: 125–132.
Jiru TE, Haghighat F (2006). A new generation of zonal models. ASHRAE Transactions, 112(2): 163–174.
Klein SA, Beckman WA, Mitchell JW, Duffie JA, Duffie NA, Freeman TL, Mitchell JC, Brau JE, Evans BL, Kummer JP, Urban RE, Fiksel A, Thornton JW, Blair NJ, Williams PM, Bradley DE, Mcdowell TP, Kummert M (2009). TRNSYS 17-XA TRaNsient SYstem Simulation program. User Manual. University of Wisconsin- Madison, USA.
Launder BE, Spalding DB (1974). The numerical computation of turbulent flows. Computer Methods in Applied Mechanics and Engineering, 3: 269–289.
Mora L, Gagdil AJ, Wurtz E (2003). Comparing zonal and CFD model predictions of isothermal indoor airflows to experimental data. Indoor Air, 13: 77–88.
Mora L, Wurtz E, Mendonca KC, Inard C (2004). Effects of coupled heat and moisture transfers through walls upon indoor environment predictions. International Journal of Ventilation, 3: 227–234.
Nicoud F, Ducros F (1999). Subgrid-scale stress modelling based on the square of the velocity gradient tensor. Flow, Turbulence and Combustion, 62: 183–200.
Nielsen PV (1990). Specification of a two dimensional test case. Technical Report, International Energy Agency, Annex 20, Air Flow Pattern within Buildings.
Norrefeld V, De Grun G, Sedlbauer (2012). VEPZO-XVelocity propagation zonal model for the estimation of the airflow pattern and temperature distribution in a confined space. Building and Environment, 48: 183–194.
Patankar SV (1980). Numerical Heat Transfer and Fluid Flow. New York: Taylor and Francis.
Ren Z, Stewart J (2003). Simulating air flow and temperature distribution inside buildings using a modified version of COMIS with sub-zonal divisions. Energy and Buildings, 35: 257–271.
Rodi W (1991). Experience with two-layer models combining the k-ɛ model with a one-equation model near the wall. In: Proceedings of 29th Aerospace Sciences Meeting, Reno, USA.
Shih T-H, Liou WW, Shabbir A, Yang Z, Zhu J (1994). A new k-ɛ eddy viscosity model for high Reynolds number turbulent flows: Model development and validation. NASA Technical Report, NASA-TM-106721.
Song F, Zhao B, Yang X, Jiang Y, Gopal V, Dobbs G, Sahm M (2008). A new approach on zonal modeling of indoor environment with mechanical ventilation. Building and Environment, 43: 278–286.
van Hoff T, Blocken B, van Heijst GJF (2013). On the suitability of steady RANS CFD for forced mixing ventilation at transitional slot Reynolds numbers. Indoor Air, 23: 236–249.
Versteeg KH, Malalasekera W (1995). An Introduction to Computational Fluid Dynamics: The Finite Volume Method. Harlow, UK: Prentice Hall.
Zuo W, Chen Q (2009). Real-time or faster-than-real-time simulation of airflow in buildings. Indoor Air, 19: 33–44.
Zuo W, Chen Q (2010). Improvements on FFD modeling by using different numerical schemes. Numerical Heat Transfer, 58: 1–16.
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Mendonça, K.C., Abadie, M.O., Béghein, C. et al. Assessing the capabilities of the zonal model to predict the isothermal airflow induced by a linear ceiling diffuser. Build. Simul. 7, 489–501 (2014). https://doi.org/10.1007/s12273-014-0165-8
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DOI: https://doi.org/10.1007/s12273-014-0165-8