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http://dx.doi.org/10.6110/KJACR.2017.29.3.105

Prediction of Stratification Model for Diffusers in Underfloor Air Distribution System using the CFD  

Son, Jeong-Eun (Graduate School, Hanbat National University)
Yu, Byeong-Ho (Graduate School, Hanbat National University)
Pang, Seung-Ki (Department of Architecture, Kyungmin College)
Lee, Kwang Ho (Department of Architectural Engineering, Hanbat National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.29, no.3, 2017 , pp. 105-110 More about this Journal
Abstract
Underfloor air distribution (UFAD) is an air distribution strategy for providing ventilation and space conditioning in buildings. UFAD systems use the underfloor plenum beneath a raised access floor to provide conditioned air through floor diffusers that create a vertical thermal stratification during cooling operations. Thermal stratification has significant effects on energy, indoor air quality, and thermal comfort performance. The purpose of this study was to characterize the influence of a linear bar grille diffuser on thermal stratification in both interior and perimeter zones by developing Gamma-Phi based prediction models. Forty-eight simulations were carried out using a Computational Fluid Dynamics (CFD) technique. The number of diffusers, the air flow supply, internal heat gains, and solar radiations varied among the different cases. Models to predict temperature stratification for the tested linear bar grille diffuser have been developed, which can be directly implemented into dynamic whole-building simulation software such as EnergyPlus.
Keywords
UFAD; Cooling; Temperature Stratification; Diffuser; CFD;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Chung, J. D., Hong, H. K., and Yoo, H. S., 2006, Effect of Radiative Mean Temperature on Thermal comfort of Underfloor Air Distribution, In Proceedings of the Summer Conference of SAREK, Yongpyong, South Korea, pp. 15-20.
2 Yoon, S. H., Jang, H. I., Kim, K. A., Yu, K. H., and Suh, S. J., 2013, An Energy Performance Evaluation of UFAD System under the Various Conditions of Thermal Load, Journal of Air-Conditioning and Ref. Eng, Vol. 25, No. 1, pp. 14-19.
3 Zhang, K., Zhang, X., Li, S., and Jin, X., 2014, Experimental Study on the Characterisrics of Supply air for UFAD System with Perforated Tiles, Journal of Energy and Buildings, Vol. 80, pp. 1-6.
4 Zhang, K., Zhang, X., and Li, S., 2016, Simplified Model for Desired Airflow Rate in Underfloor Air Distribution( UFAD) Systems, Journal of Applied Thermal Engineering, Vol. 93, pp. 244-250.   DOI
5 Jang, H. I., Yoon, S. H., Lee, H. S., and Suh, S. J., 2012, Comparison on the Energy Performance of Underfloor Air Distribution System According to Modeling Method Using EnergyPlus, Journal of Air-Conditioning and Ref. Eng., Vol. 24, No. 10, pp. 718-723.
6 Lin, Y. J. P. and Linden, P. F., 2005, A Model for and Under Floor Air Distribution System, Journal of Energy and Buildings, Vol. 37, No. 4, pp. 399-409.   DOI
7 Schiavon, S., Webster, T., Dickerhoff, D., and Bauman, F., 2014, Stratification Prediction Model for Perimeter Zone UFAD Diffusers based on Laboratory testing with Solar Simulator, Journal of Energy and Building, Vol. 82, pp. 786-794.   DOI
8 Webster, T. and Bauman, F., 2006, Design Guidelines for Stratification in UFAD Systems, Journal of HPAC Eng., Vol. 78, No. 6, pp. 6-16.
9 Paftery, P., Lee, K. H., Webster, T., and Bauman, F., 2011, Analysis of a hybrid UFAD and Radiant Hydronic Slab HVAC System, Center for the Built Environment, pp. 1-10.
10 Webster, T., Lee, K. H., Hoyt, T., Feng, J., Daly, A., Schiavon, S., and Bauman, F., 2011, Development of Guidelines for Modeling Underfloor Air Distribution (UFAD) Systems in EnergyPlus, eQUEST, and Energy-Pro for Use in California non-residential Building Energy Efficiency Standards, Center for the Built Environment, Final Report, pp. 1-39.