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.2012.10.056

Cited by 36 publications

(10 citation statements)

References 18 publications

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“…Buildings can be retrofitted using shading devices at relatively low investment costs [7]. Several studies have been performed quantifying the impact of different types of solar shading devices both exterior and interior on annual energy consumption of buildings [8,9] through building model simulation programs. Solar shading devices exhibit the best efficiency for warm climates [10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Impact of Shading Devices on Energy Consumption of Buildings in Tropical Regions

Samanta

Saha

Biswas

et al. 2014

Journal of Energy Resources Technology

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The aim of this paper is to demonstrate the role of shading devices in the improvement of energy efficiency of buildings in hot dusty and dry tropical regions. The effect of shading in reducing the energy consumption of buildings is investigated by considering a case study of a guest house chosen because of its logical design approach to reduce thermal loads. The building plan, measurements, and details on schedules of building usage activities have been used as input data to a simulation program of the building. Based on the inputs, a thermal building model is developed in TRNSYS 17 simulation program and the effect of external shading on the building has been explored. It is seen that building design and orientation determine the effectiveness of shading. Movable shading over windows has a significant impact reducing temperatures by about 1.5 °C in each thermal zone. The difference in thermal energy loads of the building calculated from modeling simulations of the base case and the control case utilizing movable shading devices is approximately 8%. A programmable logic controllers (PLC)-based movable shading device has been designed to facilitate optimal shading control. The results enable us to draw inferences regarding the additional contribution of the shading factor in energy saving techniques for buildings.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Impact of Shading Devices on Energy Consumption of Buildings in Tropical Regions

Samanta

Saha

Biswas

et al. 2014

Journal of Energy Resources Technology

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“…Historically, simulation tools have used geometrical calculations and/or radiosity methods to quantify the effect of NCS on window heat gains and daylighting [12][13][14][15][16][17]. Kirimtat et al [18] provided a detailed comprehensive review of simulation modeling tools for shading systems.…”

Section: Introductionmentioning

confidence: 99%

Efficient modeling of optically-complex, non-coplanar exterior shading: Validation of matrix algebraic methods

Wang

Ward²,

Lee

2018

Energy and Buildings

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It has long been established that shading windows with overhangs, fins, and other types of non-coplanar systems (NCS) is one of the most effective ways of controlling solar heat gains in buildings because they intercept solar radiation prior to entry into the building. Designers however often specify non-opaque materials (e.g., louvers, fritted glass, expanded metal mesh) for these systems in order to admit daylight, reduce lighting energy use, and improve indoor environmental quality. Most simulation tools rely on geometric calculations and radiosity methods to model the solar heat gain impacts of NCS and cannot model optically-complex materials or geometries. For daylighting analysis, optically-complex NCS can be modeled using matrix algebraic methods, although time-efficient parametric analysis has not yet been implemented. Determining the best design and/or material for static or operable NCS that minimize cooling, heating, and lighting energy use and peak demand requires an iterative process. This study describes and validates a matrix algebraic method that enables parametric energy analysis of NCS. Such capabilities would be useful not only for design but also for development of prescriptive energy-efficiency standards, rating and labeling systems for commercial products, development of design guidelines, and development of more optimal NCS technologies. A facade or "F" matrix, which maps the transfer of flux from the NCS to the surface of the window, is introduced and its use is explained. A field study was conducted in a full-scale outdoor testbed to measure the daylight performance of an operable drop-arm awning. Simulated data were compared to measured data in order to validate the models. Results demonstrated model accuracy: simulated workplane illuminance was within 11-13%, surface luminance was within 16-18%, and the daylight glare probability was within 6-9% of measured results. Methods used to achieve accurate results are discussed. Results of the validation of daylighting performance are applicable to solar heat gain performance. Since exterior shading can also significantly reduce peak demand, these models enable stakeholders to more accurately assess HVAC and lighting impacts in support of grid management and resiliency goals.

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“…The literature related to shading louvers covers a large variety of aspects, ranging from the evaluation of thermal performances of façades equipped with this type of devices, 1–3 the influence of the geometry of venetian blinds, 4 the impact of energy savings 5–7 and even the comfort or discomfort associated with the use of these elements. 8–10…”

Section: Introductionmentioning

confidence: 99%

Galloping instabilities of Z-shaped shading louvers

Alonso

Pérez-Grande

Meseguer

2014

Indoor and Built Environment

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Modern design of civil constructions such as office blocks, airport terminal buildings, factories, etc. incorporates more and more environmental considerations that lead to, amongst other elements, the use of glazed fagades with shading devices to optimize energy consumption. These shading devices, normally slats or louvers, are very flexible structures exposed to the action of wind, and therefore aeroelastic effects such as galloping must be taken into account in their design. A typical cross-section for such elements is a Z-shaped profile made out of a central web and two side wings. The results of a parametric analysis based on static wind tunnel tests and performed on different Z-shaped louvers to determine translational galloping instability regions are presented in this paper.

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

Cited by 36 publications

References 18 publications

Evaluation of Impact of Shading Devices on Energy Consumption of Buildings in Tropical Regions

Evaluation of Impact of Shading Devices on Energy Consumption of Buildings in Tropical Regions

Efficient modeling of optically-complex, non-coplanar exterior shading: Validation of matrix algebraic methods

Galloping instabilities of Z-shaped shading louvers

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