Solar and visible optical properties of glazing systems with venetian blinds: Numerical, experimental and blind control study

Gomes, M. Glória; Santos, A. J.; Rodrigues, A. Moret

doi:10.1016/j.buildenv.2013.09.003

Cited by 77 publications

(22 citation statements)

References 19 publications

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“…However, the glazed areas and the shading devices have a significant role over the energy building consumption, so many research studies and prototype development in the last years have increased the thermal and the energy efficiency of this translucent boundary. Therefore, the use of large façade glazing areas could lead to thermal and visual discomfort of indoor space and their occupants [23,24]. The improvements of the energy performance of windows and glazing areas have been resourcing to new materials and shapes and to the use of new strategies and technology in the glazing production.…”

Section: Windows and Glazing Solutions With Phase Change Materialsmentioning

confidence: 99%

Thermal performance of a window shutter containing PCM: Numerical validation and experimental analysis

et al. 2016

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Section: Windows and Glazing Solutions With Phase Change Materialsmentioning

confidence: 99%

Thermal performance of a window shutter containing PCM: Numerical validation and experimental analysis

et al. 2016

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“…(10) can vary during a day when blinds, especially venetian blinds, are present in the cavity. The angle between the solar incidence and the slat angle of the blinds will change and thus affect the optical properties of the DSF system (Gomes et al 2014). Wind can cause disturbance to the thermal behavior of DSF by strengthening or mitigating the airflow rate in the cavity (Saelens and Hens 2001).…”

Section: Physical Meaning Of the Coefficientsmentioning

confidence: 99%

Prediction of solar heat gain of double skin facade windows

Zheng

et al. 2016

Build. Simul.

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A linear model involving the solar heat gain coefficient and U value is often used to calculate the solar heat gain of traditional windows; however, it is not known if such linear model is applicable to double skin facades, which is typically featured by ventilated cavity and often with blinds inside. This paper reports on an experimental investigation into the relation between the two coefficients and the energy gain by a double skin facade without blinds. A small-scale solar calorimeter was constructed to measure the energy gain of a double skin facade window about 1.1 m high. Four tests with solar radiation intensity ranging from 205 to 793 W/m 2 showed that the energy gain can be represented by such linear model. The solar heat gain coefficient can be determined from the data fitting process with more accuracy than the U value, which, being a minor determinant of the heat flow in the presence of the solar radiation, may require more data for reasonable accuracy.The advantage of this linear model lies in its simplicity, which makes it easy to incorporate into present building energy simulation tools. Keywordsdouble skin facade, solar heat gain, experiment, solar radiation, linear model Article History

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“…Other authors have focused on the effects of VB in daylight transmission and interior illuminance [11,12]. Nowadays several authors work in developing automated control strategies for the blinds, maximizing indoor daylighting and minimizing solar heat gains, thus reducing the building energy consumption and improving its sustainability (see e.g., [13,14]). …”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of Ventilated Double Skin Façades with Venetian Blinds

et al. 2015

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Venetian blinds (VB) are shading devices of widespread use in residential and corporate buildings. They can reflect or transmit light into buildings and at the same time allow daylighting and exterior views. They can also efficiently block radiative heat from entering the building, and if combined with a heat dissipation system such as forced ventilation, they can improve the thermal performance of double skin façades (DSF). Computational Fluid Dynamics (CFD) has proven to be a useful tool for modeling flow and heat transfer in DSF, including conduction, convection and radiation heat transfer phenomena. The aim of this work is to evaluate, by means of CFD, the influence of several optical, construction and operation parameters of a DSF (such as optical properties of the materials, geometrical relations of the VB or flow stream conditions) in terms of energy savings, measured as a reduction of the solar load entering the building. Results obtained show that parameters such as the proximity of the VB to the exterior skin of the façade or a differentiated surface treatment for the exterior and interior faces of the VB louvers can notably affect the thermal performance of the DSF and hence the heat gains experienced by the building.

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Solar and visible optical properties of glazing systems with venetian blinds: Numerical, experimental and blind control study

Cited by 77 publications

References 19 publications

Thermal performance of a window shutter containing PCM: Numerical validation and experimental analysis

Thermal performance of a window shutter containing PCM: Numerical validation and experimental analysis

Prediction of solar heat gain of double skin facade windows

Thermal Performance of Ventilated Double Skin Façades with Venetian Blinds

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