The Impact of an Air-Supply Guide Vane on the Indoor Air Distribution
Indoor air distribution has great impact on people-s thermal sensation. Therefore, how to remove the indoor excess heat becomes an important issue to create a thermally comfortable indoor environment. To expel the extra indoor heat effectively, this paper used a dynamic CFD approach to study the effect of an air-supply guide vane swinging periodically on the indoor air distribution within a model room. The numerical results revealed that the indoor heat transfer performance caused by the swing guide vane had close relation with the number of vortices developing under the inlet cold jet. At larger swing amplitude, two smaller vortices continued to shed outward under the cold jet and remove the indoor heat load more effectively. As a result, it can be found that the average Nusselt number on the floor increased with the increase of the swing amplitude of the guide vane.
[1] ISO 7730, Ergonomics of the Thermal Environment - Analytical Determination and Interpretation of Thermal Comfort Using Calculation
of the PMV and PPD Indices and Local Thermal Comfort Criteria, 2005.
[2] ANSI/ASHRAE 55, Thermal Environmental Conditions for Human
Occupancy, 2004.
[3] P. V. Nielsen, A. Restivo, and J. H. Whitelaw, "The Velocity
Characteristics of Ventilated Rooms," J. Fluids Engineering, vol. 100, pp.
291-298, 1978.
[4] P. V. Nielson, "The Selection of Turbulence Models for Prediction of
Room Airflow," ASHRAE Trans., vol. 104, Part. 1B, pp. 1119-1127,
1998.
[5] H. B. Awbi, "Application of Computational Fluid Dynamics in Room
Ventilation," Building and Environment, vol. 24, pp. 73-84, 1989.
[6] Awbi, H.B., Ventilation of Buildings, 1st Edition, E & FN SPON, 1991.
[7] Q. Chen, "Computational fluid dynamics for HVAC: success and
failures," ASHRAE Transaction, vol. 103(1), pp. 178-187, 1992a.
[8] Q. Chen, "Significant Questions in Predicting Room Air Motion,"
ASHRAE Transaction, vol. 98, Part. 1, pp. 927-939, 1992b.
[9] Q. Chen, and L. R. Glicksman, "Simplified Methodology to Factor Room
Air Movement and the Impact on Thermal Comfort into Design of
Radiative, Convective and Hybrid Heating and Cooling Systems,"
ASHRAE report: RP-927, 1999.
[10] Q. Chen, "Ventilation performance prediction for buildings: A method
overview and recent applications," Building and Environment, vol. 44,
pp. 848-858, 2009.
[11] S. Murakami, M. Kaizuka, H. Yoshino, and S. Kato, Room air convection
and ventilation effectiveness, American Society of Heating, Refrigeration
and Air-Conditioning Engineers, Inc. USA., 1992.
[12] S. Murakami, S. Kato, and R. Ooka, "Comparison of Numerical
Predictions of Horizontal Nonisothermal Jet in a Room with Three
Turbulence Models- k-╬Á, EVM, ASM, and DSM", ASHRAE Transaction,
vol. 100, Part. 2, pp. 697-704, 1994.
[13] Y. Li, and L. Baldacchino, "Implementation of some higher-order
convection schemes on non-uniform grids," International Journal for
Numerical Methods in Fluids, vol. 21, pp. 1201-1220, 1995.
[14] W. Xu, Q. Chen, and F. T. M. Nieuwstadt, "A New Turbulence Model for
Near-Wall Natural Convection", International Journal of Heat and Mass
Transfer, vol. 41, pp. 3161-3176, 1998.
[15] Q.-H. Deng, and G.-F. Tang, "Numerical visualization of mass and heat
transport for mixed convective heat transfer by streamline and heatline,"
Int. J. Heat Mass Trans., vol. 45, pp. 2387-2396, 2002.
[16] G. Gan, "Evaluation of Room Air Distribution Systems Using
Computational Fluid Dynamics," Energy and Buildings, Vol.23, pp.
83-93, 1995.
[17] S. M. Saeidi, and J. M. Khodadadi, "Forced convection in a square cavity
with inlet and outlet ports," Int. J. Heat Mass Transfer, vol. 49, pp.
1896-1906, 2006.
[18] S. L. Sinha, R. C. Arora, and S. Roy, "Numerical Simulation of
Two-Dimensional Room Air Flow with and without Buoyancy," Energy
and Buildings, vol. 32, pp. 121-129, 2000.
[19] Z. Zhang, W. Zhang, Z. Zhai, and Q. Chen, "Evaluation of various
turbulence models in predicting airflow and turbulence in enclosed
environments by CFD: Part-2: comparison with experimental data from
literature," HVAC&R Research, vol. 13, no. 6, 2007.
[20] A. Stamou, and I. Katsiris, "Verification of a CFD model for indoor
airflow and heat transfer," Building and Environment, vol. 41, pp.
1171-1181, 2006.
[21] X. Shi, and J. M. Khodadadi, "Fluid Flow and Heat Transfer in a
Lid-Driven Cavity Due to an Oscillating Thin Fin: Transient Behavior,"
ASME J. Heat Transfer, vol. 126, pp. 924-930, 2004.
[22] ANSYS FLUENT: User-s Guide, Release 14.5, ANSYS Inc., USA, 2012.
[1] ISO 7730, Ergonomics of the Thermal Environment - Analytical Determination and Interpretation of Thermal Comfort Using Calculation
of the PMV and PPD Indices and Local Thermal Comfort Criteria, 2005.
[2] ANSI/ASHRAE 55, Thermal Environmental Conditions for Human
Occupancy, 2004.
[3] P. V. Nielsen, A. Restivo, and J. H. Whitelaw, "The Velocity
Characteristics of Ventilated Rooms," J. Fluids Engineering, vol. 100, pp.
291-298, 1978.
[4] P. V. Nielson, "The Selection of Turbulence Models for Prediction of
Room Airflow," ASHRAE Trans., vol. 104, Part. 1B, pp. 1119-1127,
1998.
[5] H. B. Awbi, "Application of Computational Fluid Dynamics in Room
Ventilation," Building and Environment, vol. 24, pp. 73-84, 1989.
[6] Awbi, H.B., Ventilation of Buildings, 1st Edition, E & FN SPON, 1991.
[7] Q. Chen, "Computational fluid dynamics for HVAC: success and
failures," ASHRAE Transaction, vol. 103(1), pp. 178-187, 1992a.
[8] Q. Chen, "Significant Questions in Predicting Room Air Motion,"
ASHRAE Transaction, vol. 98, Part. 1, pp. 927-939, 1992b.
[9] Q. Chen, and L. R. Glicksman, "Simplified Methodology to Factor Room
Air Movement and the Impact on Thermal Comfort into Design of
Radiative, Convective and Hybrid Heating and Cooling Systems,"
ASHRAE report: RP-927, 1999.
[10] Q. Chen, "Ventilation performance prediction for buildings: A method
overview and recent applications," Building and Environment, vol. 44,
pp. 848-858, 2009.
[11] S. Murakami, M. Kaizuka, H. Yoshino, and S. Kato, Room air convection
and ventilation effectiveness, American Society of Heating, Refrigeration
and Air-Conditioning Engineers, Inc. USA., 1992.
[12] S. Murakami, S. Kato, and R. Ooka, "Comparison of Numerical
Predictions of Horizontal Nonisothermal Jet in a Room with Three
Turbulence Models- k-╬Á, EVM, ASM, and DSM", ASHRAE Transaction,
vol. 100, Part. 2, pp. 697-704, 1994.
[13] Y. Li, and L. Baldacchino, "Implementation of some higher-order
convection schemes on non-uniform grids," International Journal for
Numerical Methods in Fluids, vol. 21, pp. 1201-1220, 1995.
[14] W. Xu, Q. Chen, and F. T. M. Nieuwstadt, "A New Turbulence Model for
Near-Wall Natural Convection", International Journal of Heat and Mass
Transfer, vol. 41, pp. 3161-3176, 1998.
[15] Q.-H. Deng, and G.-F. Tang, "Numerical visualization of mass and heat
transport for mixed convective heat transfer by streamline and heatline,"
Int. J. Heat Mass Trans., vol. 45, pp. 2387-2396, 2002.
[16] G. Gan, "Evaluation of Room Air Distribution Systems Using
Computational Fluid Dynamics," Energy and Buildings, Vol.23, pp.
83-93, 1995.
[17] S. M. Saeidi, and J. M. Khodadadi, "Forced convection in a square cavity
with inlet and outlet ports," Int. J. Heat Mass Transfer, vol. 49, pp.
1896-1906, 2006.
[18] S. L. Sinha, R. C. Arora, and S. Roy, "Numerical Simulation of
Two-Dimensional Room Air Flow with and without Buoyancy," Energy
and Buildings, vol. 32, pp. 121-129, 2000.
[19] Z. Zhang, W. Zhang, Z. Zhai, and Q. Chen, "Evaluation of various
turbulence models in predicting airflow and turbulence in enclosed
environments by CFD: Part-2: comparison with experimental data from
literature," HVAC&R Research, vol. 13, no. 6, 2007.
[20] A. Stamou, and I. Katsiris, "Verification of a CFD model for indoor
airflow and heat transfer," Building and Environment, vol. 41, pp.
1171-1181, 2006.
[21] X. Shi, and J. M. Khodadadi, "Fluid Flow and Heat Transfer in a
Lid-Driven Cavity Due to an Oscillating Thin Fin: Transient Behavior,"
ASME J. Heat Transfer, vol. 126, pp. 924-930, 2004.
[22] ANSYS FLUENT: User-s Guide, Release 14.5, ANSYS Inc., USA, 2012.
@article{"International Journal of Architectural, Civil and Construction Sciences:56382", author = "C.-C. Tsao and S.-W. Nien and W.-H. Chen and Y.-C. Shih", title = "The Impact of an Air-Supply Guide Vane on the Indoor Air Distribution", abstract = "Indoor air distribution has great impact on people-s thermal sensation. Therefore, how to remove the indoor excess heat becomes an important issue to create a thermally comfortable indoor environment. To expel the extra indoor heat effectively, this paper used a dynamic CFD approach to study the effect of an air-supply guide vane swinging periodically on the indoor air distribution within a model room. The numerical results revealed that the indoor heat transfer performance caused by the swing guide vane had close relation with the number of vortices developing under the inlet cold jet. At larger swing amplitude, two smaller vortices continued to shed outward under the cold jet and remove the indoor heat load more effectively. As a result, it can be found that the average Nusselt number on the floor increased with the increase of the swing amplitude of the guide vane.
", keywords = "Computational Fluid Dynamics (CFD), dynamic mesh, heat transfer, indoor air distribution, thermal comfort.", volume = "7", number = "5", pages = "352-5", }
