Investigation of Down-Draught Effect on The Thermal Comfort Indexes in The Building With Glazing Envelope

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Faculty of Engineering, Vali-e-Asr University of Rafsanjan, Iran

2 Department of Civil Engineering, Faculty of Engineering, Vali-e-Asr University of Rafsanjan, Iran

Abstract

Employing large windows in the modern buildings is one the most popular approach among architects and buildings designers but the increase of energy consumption of the building due to down draught effects caused by large windows is one of the challenges against this type of design. Also, preventing of utilizing traditional heating system adjacent to the window is another concern of the approach. In this study, the use of forced convection heating system to mitigate the down-draught effects is simulated by computational fluid dynamic method for three different configurations of the warm air registers mounted (a) under the window; (b) alongside walls and (c) in mixed form under and above the window. The results were investigated by comparing air temperature and velocity distribution in the space and also the thermal comfort conditions were analyzed through Fenger model. The results showed that the third configuration of the inlet registers which they are installed beneath and above the window, is in satisfactory concord to ASHRAE standards and ISO 7730 such that at ankle and breathing height of sitting and standing position, the comfort condition indexes are in regular range of the standards.

Keywords

Main Subjects

References

  1. Arabsolghar, A., and Arabsolghar, M., "Comparative Study of Mechanical Characteristic of Mini Implants through Implementation of Real Working Condition Using Finite Element Method", Research in dental sciences, 14, pp. 40-48, (2017).
  2. Marino, C., Nucara, A., and Pietrafesa, M., "Does Window-to-Wall Ratio Have a Significant Effect on the Energy Consumption of Buildings? A Parametric Analysis in Italian Climate Conditions", Building Engineering, Vol. 13, pp. 169-183, (2017).
  3. Persson, M. L., Roos, A., and Wall, M., "Influence of Window Size on the Energy Balance of Low Energy Houses", Energy and Buildings, Vol. 38, pp. 181-188, (2006).
  4. Kesik, T., and Eng,P., "The Glass Condo Conundrum", University of Toronto, Ontario, Canada, (2011).
  5. O'Brien, W., & Bennet, I., "Simulation-Based Evaluation of High-Rise Residential Building Thermal Resilience", Ashrae Transactions, Vol. 122, No. 1, pp. 113-142, (2016).
  6. Bennet, I. E., and O’Brien, W., Field Study of Thermal Comfort and Occupant Satisfaction in Canadian Condominiums", Architectural Science Review, 60, No. 1, pp. 27-39, (2017).
  7. Heiselberg, P., Draught Risk from Cold Vertical Surfaces", Building and Environment, Vol. 29, No. 3, pp. 297-301, (1994).
  8. Kahsay, M. T., "Optimization of Window Confirguration in Buildings for Sustainable Thermal and Lighting Performance", pp. 58-67, (2019).
  9. Zukowski, M. A., "New Formula for Determining a Minimum Recommended Value of Inlet Air Velocity from UFAD System to Prevent Occupants from Draught Risk", Building and environment, Vol. 42, No. 1, pp. 171-179, (2007).
  10. Liu, S., Schiavon, S., Kabanshi, A., and Nazaroff, W. W., "Predicted Percentage Dissatisfied with Ankle Draft", Indoor Air, Vol. 27, No. 4, Pp. 852-862, (2017).
  11. Schiavon, S., Rim, D., Pasut, W., and Nazaroff, W. W., "Sensation of Draft at Uncovered Ankles for Women Exposed to Displacement Ventilation and Underfloor Air Distribution Systems", Building and environment, Vol. 96, Pp. 228-236, (2016).
  12. Schellen, L., Timmers, S., Loomans, M. G. L. C., Nelissen, E., Hensen, J. L. M., & van Marken Lichtenbelt, W., "Downdraught Assessment During Design: Experimental and Numerical Evaluation of a Rule of Thumb", Building and environment, Vol. 57, Ppp. 290-301, (2012).
  13. Ploskic, A., & Holmberg, S., "Heat Emission from Thermal Skirting Boards: An Analytical Investigation", 5th International Workshop on Energy and Environment of Residential Buildings/3rd International Conference on Built Environment and Public Health, Guilin, PEOPLES R CHINA, MAY 29-31, 1354-1361, (2009).
  14. Ploskić, A., and Holmberg, S., "Heat Emission from Thermal Skirting Boards", Building and Environment, Vol. 45, No. 5, pp. 1123-1133, (2010).
  15. Jurelionis, A., and Isevičius, E., "CFD Predictions of Indoor Air Movement Induced by Cold Window Surfaces", Civil Engineering and Management, 14, No.1, Pp. 29-38, (2008).
  16. Bauman, F., and Webster, T., "Outlook for Underfloor Air Distribution", ASHRAE Journal, pp. 234-247, (2001).
  17. Alajmi, A. F., Abou-Ziyan, H. Z., and El-Amer, W., "Energy Analysis of Under-Floor Air Distribution (UFAD) System: An Office Building Case Study", Energy Conversion and Management, 73, pp. 78-85, (2013).
  18. Xue, Y., and Chen, Q., "Influence of Floor Plenum on Energy Performance of Buildings with UFAD Systems", Energy and buildings, Vol. 79, Pp. 74-83, (2014).
  19. Alajmi, A. F., Baddar, F. A., & Bourisli, R. I., "Thermal Comfort Assessment of an Office Building Served by Under-Floor Air Distribution (UFAD) System– A Case Study", Building and environment, Vol. 85, pp. 153-159, (2015).
  20. Nada, S. A., El-Batsh, H. M., Elattar, H. F., & Ali, N. M., "CFD Investigation of Airflow Pattern, Temperature Distribution and Thermal Comfort of UFAD System for Theater Buildings Applications", Building Engineering, Vol. 6, Pp. 274-300, (2016).
  21. Shokrollahi, S., Hadavi, M., Heidarinejad, G., and Pasdarshahri, H., "Multi-Objective Optimization of Underfloor Air Distribution (UFAD) Systems Performance in a Densely Occupied Environment: A Combination of Numerical Simulation and Taguchi Algorithm", Building Engineering, Vol. 32, P. 101495, (2020).
  22. De Dear, R., Xiong, J., Kim, J., & Cao, B.A., "Review of Adaptive Thermal Comfort Research Since 1998", Energy and Buildings, Vol. 214, P. 109893, (2020).
  23. Fanger, P. O., "Thermal Comfort. Analysis and Applications in Environmental Engineering", Danish Technical Press, Copenhagen, Denmark, pp. 96-108, (1970).
  24. ASHRAE, "Thermal Environmental Conditions for Human Occupancy, The American Society of Heating Refrigerating and Air-Conditioning Engineers", Special Publications, Atlanta, GA, pp. 1-35, (2017).
  25. https://www.iso.org/standard/39155.html, ISO 7730:2005
  26. Chen, Q., "Comparison of Different k-ε Models for Indoor Air Flow Computations", Numerical Heat Transfer, Part B Fundamentals, Vol. 28, No. 3,pPp. 353-369, (1995).
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