Full-scale measurements of convective coefficient on external surface of a low-rise building in sheltered conditions

Liu, Y.; Harris, Douglas John

doi:10.1016/j.buildenv.2006.07.013

Cited by 97 publications

(54 citation statements)

References 4 publications

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“…The four models chosen for the comparison are based on full-scale experiments and they are developed by: Loveday and Taki [20], ASHRAE task group [26], MoWITT [27] and Liu and Harris [19]. These models can be divided in two groups: Loveday and Taki and the ASHRAE task group, that are representative of buildings with 6-8 floor (high buildings), MoWITT and Liu and Harris, that are representative of low buildings.…”

Section: Resultsmentioning

confidence: 99%

“…Section 2 describes the numerical model used in the numerical simulations. In Section 3 a comparison between convective heat transfer coefficient values on the windward and leeward façade within an urban canyon and on the windward external façade given by our simulations and the CHTC given by experimental correlation [19,[20][21][22][23][24][25][26][27] and by numerical simulations by other authors [21] is carried out.…”

Section: Open Accessmentioning

confidence: 99%

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CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings

2015

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Convective heat transfer coefficients for external building surfaces are essential in building energy simulation (BES) to calculate convective heat gains and losses from building facades and roofs to the environment. These coefficients are complex functions of: building geometry, building surroundings, local air flow patterns and temperature differences. A microclimatic analysis in a typical urban configuration, has been carried out using Ansys Fluent Version 14.0, an urban street canyon, with a given H/W ratio, has been considered to simulate a three-dimensional flow field and to calculate the thermal fluid dynamics parameters that characterize the street canyon. In this paper, the convective heat transfer coefficient values on the windward external façade of the canyon and on the windward and leeward inner walls are analyzed and a comparison with values from experimental and numerical correlations is carried out.

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Section: Resultsmentioning

confidence: 99%

Section: Open Accessmentioning

confidence: 99%

CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings

2015

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“…The incidence angle is defined as the angle between the approach flow wind direction and the normal to the windward surface. Lui and Harris [26] however showed that a more detailed dependency on the wind direction is required.…”

Section: Full-scale Experimentsmentioning

confidence: 99%

“…The need for more accurate and truthful estimates of CHTCs for buildings led to an extensive amount of field measurements for building facades [15][16][17][18][19][20][21][22][23][24][25][26], for roofs [24,27,28] and to study the effect of glazing framework on the CHTC [29][30][31]. A clear overview of the different experimental techniques to determine these CHTCs and their limitations was given by Hagishima et al [9].…”

Section: Full-scale Experimentsmentioning

confidence: 99%

“…Sturrock [16] Nicol [19] Jayamaha et al [22] Loveday and Taki [23] Liu and Harris [26] hc,e (W/m²K) 6 ASHRAE Task Group [18] Sharples [20] Loveday and Taki [23] Hagishima and Tanimoto [24] Zhang et al [25] Liu and Harris [26] (6)) over leeward surface (coordinate system same as in Fig.7). Note that the z-axis in Figure 9(b) is reversed compared to that in Figure 9(a).…”

Section: Conflict Of Interest Statementmentioning

confidence: 99%

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Convective heat transfer coefficients for exterior building surfaces: Existing correlations and CFD modelling

Defraeye

Blocken

Carmeliet

2011

Energy Conversion and Management

222

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Convective heat transfer at exterior building surfaces has an impact on the design and performance of building components such as double-skin facades, solar collectors, solar chimneys, ventilated photovoltaic arrays, etc. and also affects the thermal climate and cooling load in urban areas. In this study, an overview is given of existing correlations of the exterior convective heat transfer coefficient (CHTC) with the wind speed, indicating significant differences between these correlations. As an alternative to using existing correlations, the applicability of CFD to obtain forced CHTC correlations is evaluated, by considering a cubic building in an atmospheric boundary layer. Steady Reynolds-Averaged Navier-Stokes simulations are performed and, instead of the commonly used wall functions, low-Reynolds number modelling (LRNM) is used to model the boundary-layer region for reasons of improved accuracy. The flow field is found to become quasi independent of the Reynolds number at Reynolds numbers of about 10 5 . This allows limiting the wind speed at which the CHTC is evaluated and thus the grid resolution in the near-wall region, which significantly reduces the computational expense. The distribution of the power-law CHTC-U 10 correlation over the windward and leeward surfaces is presented (U 10 = reference wind speed at 10 m height). It is shown that these correlations can be accurately determined by simulations with relatively low wind speed values, which avoids the use of excessively fine grids for LRNM, and by using only two or three discrete wind speed values, which limits the required number of CFD simulations.

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Numerical Assessment of the Energy Efficiency of an Open Joint Ventilated Façade for Typical Meteorological Months Data in Southern Spain

Delgado

Domínguez-Torres

Iñesta-Vaquera

2016

SEMA SIMAI Springer Series

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Full-scale measurements of convective coefficient on external surface of a low-rise building in sheltered conditions

Cited by 97 publications

References 4 publications

CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings

CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings

Convective heat transfer coefficients for exterior building surfaces: Existing correlations and CFD modelling

Numerical Assessment of the Energy Efficiency of an Open Joint Ventilated Façade for Typical Meteorological Months Data in Southern Spain

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