Reprint of “Assessment of approaches for modeling louver shading devices in building energy simulation programs”

Sælens, Dirk; Parys, Wout; Roofthooft, J.; Tablada, Abel

doi:10.1016/j.enbuild.2013.11.031

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…For the shading device, a 2D angular and time-dependent model was adopted. The authors of [69] noted that the use of a simplified implementation of shading factors is possible within acceptable margins of error by implementing average results from ray-tracing calculations.…”

Section: Bi Several Systemsmentioning

confidence: 98%

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Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the coupled building/system configuration

Lamnatou

Mondol

Chemisana

et al. 2015

Renewable and Sustainable Energy Reviews

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Section: Bi Several Systemsmentioning

confidence: 98%

“…A ray tracing method was developed to model the solar transmittance of louver shading devices [69]. The developed method was integrated in TRNSYS to assess the cooling demand and peak cooling power in a south-oriented office room under Belgium climatic conditions.…”

Section: Bi Several Systemsmentioning

confidence: 99%

Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the coupled building/system configuration

Lamnatou

Mondol

Chemisana

et al. 2015

Renewable and Sustainable Energy Reviews

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“…Shading components can take many forms, such as self-shading forms, compact urban forms or shading devices. Studies by Freewan [4], Laura Bellia et al [5], Samuel et al (2013) [6], Saelens D. et al [7] and Kim G. et al [8] showed how shading devices contribute to reducing energy consumption, improving daylighting and improving thermal comfort and productivity.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Solutions Depending on Building Forms Design with Tilted South and North Facades

Freewan

2022

Buildings

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Interactions between buildings and outdoor environment variables, such as the sun, wind and precipitation, depend on building parameters such as orientation, colours, materials and forms. Building forms are one of the most important parameters that directly impact the cooling and heating load energy consumption, daylight environment and urban sustainability. The current study focused on how building forms affect the energy performance of buildings. Inclined forms that were shaped based on the inclination of south and north facades were studied. Many methods were used to explore the impacts of several variables, including exposure to direct sunrays and heating and cooling load. Thermal performance and energy consumption were investigated for many inward- and outward-tilted angles forms for both the south and north directions and compared to vertical facades. In addition, the study developed new building forms based on a combination of south and north tilted forms, which have low energy consumption. The configurations achieved an acceptable balance between cooling and heating energy consumption. A series of computer simulations were developed using energy plus a calculation engine within DesignBuilder, SunCast, Radiance and IES VE. The results showed that outward-tilted facades for the south orientation perform well, as they reduced the cooling load due to self-shading. Building forms that balanced south and north tilted facades saved the most energy. South-tilted facades forming only 30° angles performed the best, with average energy savings of 20%. Meanwhile, forms with 30° south-tilted facade and 10° tilted north facades, such as forms 3–6, reduced energy consumption by more than 23% compared to the base case.

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“…In building design, it is common practise to model blinds in a simplified way (Kuhn, 2006;Saelens et al, 2014) frequently with a constant g-value which often corresponds to closed slats (Kuhn, 2006). Conducting building simulations with closed slats might lead to advantageous results with respect to solar and glare protection compared to more sophisticated control strategies based on profile angle of sun and cut-off angle of slats (Herkel et al;Kuhn, 2006).…”

Section: Introductionmentioning

confidence: 99%

Occupant satisfaction with two blind control strategies: Slats closed and slats in cut-off position

2015

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Modern highly glazed buildings require solar shading in order to obtain visual and thermal comfort for the occupants in addition to obtain a low energy use of the building. For the system to respond to the external conditions in an intelligent manner, automated operation is needed. When utilising an automatic solar shading system, it is important to use a control strategy that is accepted and preferred by the occupants. Consequently, the objective of this study is to investigate occupant satisfaction with respect to visual comfort under two blind strategies: one simple control strategy with closed slats when the solar shading is activated and one more detailed control strategy that utilises the cut-off angle of the slats or a minimum slat angle of 15˚ when solar shading is activated. Results from the study are helpful in the development of control strategies for blinds and are indications of how blinds should be treated in building design. Responses from 40 participants in a repeated measure design survey revealed that the detailed control strategy was significantly more popular among the test subjects than the simple control strategy. Comments by the participants gave strong indications that view to the outside influenced the choice of preferred control strategy. Even if the detailed control strategy was found to be the most preferred, the results indicate that it was not sufficient to avoid glare. Based on the results, both glare and view aspects should be incorporated in the building design to a greater extent than what is common practice today. It can further be recommended that more effort is put into finding optimal set points for activation of the solar shading and for controlling the tilt angle of the blind in order to obtain a more robust control strategy with limited overrule actions.

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Reprint of “Assessment of approaches for modeling louver shading devices in building energy simulation programs”

Cited by 11 publications

References 18 publications

Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the coupled building/system configuration

Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the coupled building/system configuration

Energy-Efficient Solutions Depending on Building Forms Design with Tilted South and North Facades

Occupant satisfaction with two blind control strategies: Slats closed and slats in cut-off position

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