THERMAL SCIENCE

International Scientific Journal

Andrea Vallati

,

Giorgio Galli

,

Chiara Colucci

,

Pawel Oclon

INFLUENCE OF THE GEOMETRICAL PARAMETERS OF URBAN CANYONS ON THE CONVECTIVE HEAT TRANSFER COEFFICIENT

ABSTRACT
In this study, a microclimate analysis has been carried out starting with a particular urban configuration, "the street canyon". The analysis, conducted by performing numerical simulations using the finite volumes commercial code ANSYS-Fluent studies how the thermal and flow field are affected by the effect of the solar radiation, varying the ratio H/W. Furthermore, a thermo-fluid dynamic analysis of natural convection effects and of 3D characteristics of the flow field on the heat transfer coefficient, has been carried out. The check of the urban microclimate through this type of study, can be helpful to find solutions at thermal comfort and energy saving.
KEYWORDS
urban canyon, solar radiation, computational fluid dynamics (CFD), urban microclimate
PAPER SUBMITTED: 2017-05-11
PAPER REVISED: 2017-12-03
PAPER ACCEPTED: 2017-12-06
PUBLISHED ONLINE: 2018-01-07
DOI REFERENCE: https://doi.org/10.2298/TSCI170511295V
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 2, PAGES [1211 - 1223]
REFERENCES
  1. Moonen, P., et al., Urban physics effect of the micro-climate on comfort, health and energy demand, Frontiers of Architectural Research, 1 (2012), pp. 197-228
  2. United Nations, Department of Economic and Social Affairs, Population Division (2014), World Urbanization Prospects: The 2014 Revision, Highlights (ST/ESA/SER.A/352)
  3. Li, L., et al., Numerical study on the impact of ground heating and ambient wind speed on flow fields in street canyons, Advances in Atmospheric Sciences, 29 (2012), pp. 1227-1237
  4. Uehara, K., et al., Wind tunnel experiments on how thermal stratification affects how in and above urban street canyons, Atmospheric Environment, 34 (2000), pp. 1553-1562
  5. Assimakopoulos, V.D., et al., Experimental validation of a computational fluid dynamics code to predict the wind speed in street canyons for passive cooling purposes, Solar Energy, 80 (2006), pp. 423-434
  6. Tominaga, Y., et al., Wind tunnel analysis of flow and dispersion in cross-ventilated isolated buildings: Impact of opening positions, Journal of Wind Engineering and Industrial Aerodynamics, 155 (2016), pp. 74-88
  7. Offerle, B., et al., Surface heating in relation to air temperature, wind and turbulence in an urban street canyon. Boundary-Layer Meteorology, 122 (2007), pp. 273-292
  8. Blocken, B., et al., Pedestrain-level wind conditions around buildings: Review of wind-tunnel and CFD techniques and their accuracy for wind comfort assessment, Building and Environment, 100 (2016), pp. 50-81
  9. Allegrini, J., et al., Wind tunnel measurements of buoyant flows in street canyons, Building and Environment., 59 (2013), pp. 315-326
  10. Galli, G., et al., Passive cooling design options to improve thermal comfort in an Urban District of Rome, under hot summer conditions, International Journal of Engineering and Technology, 5 (2013), 5, pp. 4495-4500
  11. De Lieto Vollaro, R., et al., Different methods to estimate the mean radiant temperature in an urban canyon, Advanced Materials Research, 650 (2013), pp. 647-651
  12. De Lieto Vollaro, A., et al., Analysis of thermal field within an urban canyon with variable thermophysical characteristics of the building's walls, Journal of Physics: Conference Series, 655 (1): 012056, (2015)
  13. Oleson, K.W., et al., An urban parameterization for a global climate model. Part I: Formulation and evaluation for two cities, Journal of Applied Meteorology and Climatology, 47 (2008), pp. 1038-1060
  14. Masson, V., A physically-based scheme for the urban energy budget in atmospheric models, Boundary-Layer Meteorology, 94 (2000), pp. 357-397
  15. Allegrini, J., et al., An adaptive temperature wall function for mixed convective flows at exterior surfaces of buildings in street canyons, Building and Environment, 49 (2012), pp. 55-66
  16. Franke, J., et al., Best Practice Guideline for the CFD Simulation of Flows in the Urban Environment; COST Action 732, (2007), COST Office: Brussels, Belgium
  17. Tominaga, Y., et al., AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings, Journal of Wind Engineering and Industrial Aerodynamics, 96 (2008), pp. 1749-1761
  18. Bottillo, S., et al., Fluid dynamic and heat transfer parameters in an urban canyon, Solar Energy, 99 (2013), pp. 1-10
  19. Montazeri, H., et al., CFD analysis of forced convective heat transfer coefficients at windward building facades: influence of building geometry, Journal of Wind Engineering and Industrial Aerodynamics, 146 (2015), pp. 102-116
  20. Bottillo, S., et al., CFD modeling of the impact of solar radiation in a tridimensional urban canyon at different wind conditions, Solar Energy, 102 (2014), pp. 212-222
  21. Blocken, B., et al., High-resolution CFD simulations for forced convective heat transfer coefficients at the façade of a low rise building, Building and Environment, 44 (2009), pp. 2396-2412
  22. Saneinejad, S., et al., Analysis of convective heat and mass transfer at the vertical walls of a street canyon, Journal of Wind Engineering and Industrial Aerodynamics, 99 (2011), pp. 424-433
  23. Allegrini, J., et al., Analysis of convective heat transfer at building façades in street canyons and its influence on the predictions of space cooling demand in buildings, Journal of Wind Engineering and Industrial Aerodynamics, 104 (2012), pp. 464-473
  24. De Lieto Vollaro, A., et al., Numerical study of urban canyon microclimate related to geometrical parameters, Sustainability, 6 (2014), pp. 7894-7905
  25. Santamouris, M., et al., Thermal and air flow characteristics in a deep pedestrian canyon under hot weather conditions, Atmospheric Environment, 33 (1999), pp. 4503-4521
PDF VERSION [DOWNLOAD]
Influence of the geometrical parameters of urban canyons on the convective heat transfer coefficient

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence