Annual Performance Assessment of Complex Fenestration Systems in Sunny Climates Using Advanced Computer Simulations

Basurto, Chantal; Kämpf, Jérôme Henri; Scartezzini, Jean-Louis

doi:10.15627/jd.2015.6

Cited by 12 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beside reflective gratings as shown in Figure 2, refractive prismatic systems can be applied, e.g., as micro-structures, which originally were developed to improve the daylighting of deep rooms. Application and production-related variations are described in [4,5,6,7,8]. These micro-structures can also be used for the redirection of direct and diffuse solar radiation in the visible and infrared spectrum onto the rear surface of bifacial PV modules as shown in Figure 1.…”

Section: Micro-structured Redirection Of Solar Radiationmentioning

confidence: 99%

Optimization of Bifacial Photovoltaics by Optical Systems Feasibility Study

Mueller¹

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Bifacial PV cells allow light to reach the cell from the rear, achieving rear side efficiencies from 60% to over 95%. The predicted annual bifacial gain in irradiance (rear / front) can be 5% to 30% depending mainly on the reflectivity of the ground (albedo). It can be increased by optical systems redirecting diffuse and direct solar radiation to the rear of the solar cell without solar tracking. The optical systems can work by the physical effects of refraction or reflection. Beside reflective gratings refractive prismatic systems can be applied, e.g., as micro-structures, which originally were developed to improve daylighting of deep rooms. Applications and production related variations are described. The arrangement of the optical system and PV module can vary according to the orientation and setup of the module, which may be in open spaces or integrated into buildings. The advantage of bifacial over monofacial cells is expressed by the “bifacial gain”. This is the additional part of the total energy that a bifacial PV system produces in comparison to a monofacial system with the same orientation and size. This additional yield is given in the literature as 5% to 30%, depending on the reflectivity of the ground and the cell type. For the redirection of solar radiation by micro-structured systems on HIT bifacial solar cells a bifacial gain of 51% to 68% can be assumed. These preliminary results have to be confirmed by tests.

show abstract

Section: Micro-structured Redirection Of Solar Radiationmentioning

confidence: 99%

Optimization of Bifacial Photovoltaics by Optical Systems Feasibility Study

Mueller¹

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…The illumination of rooms by redirected sunlight can be calculated for defined solar positions at a specific time of the year and day [20]. Simulation tools like DIALux or RELUX use bidirectionally measured data [18] of sunlight redirecting systems.…”

Section: Illuminance and Energy Saving In Sunlit Roomsmentioning

confidence: 99%

“…Moreover, the new international standard for daylighting, CEN EN 17037, Daylight of Buildings [15], defines recommendations of daylight provision as well as calculation methods of their assessment. Target illuminances of 300, 500, and 750 lx can be calculated by validated software for Daylight factors [16,17] or for illuminance levels using climate data for a given site and an adequate time step [18][19][20]. As the Daylight factor is based on covered sky conditions, the method using climate data is applied for daylighting by direct sunlight (clear sky conditions).…”

Section: Introductionmentioning

confidence: 99%

Application of Micro-structured Sunlighting Systems in Different Climatic Zones

Mueller¹

2019

Journal of Daylighting

View full text Add to dashboard Cite

Two-sided micro-structures on windowpanes have been developed for redirecting sunlight into the depth of rooms in order to improve daylighting. In a joint research project comprehensive sunlighting-systems for windows are developed, integrating micro-structures in triple-glass units. The fixed units redirect sunlight to the ceiling and the depth of the room, avoiding glare. The system works for all solar altitudes and therefore can be applied in locations of all latitudes and climate zones. The study compares the energy efficiency of the sunlighting system in different locations. The performance of the sunlighting system has been simulated by tools like DiaLux and tested by measurements. Based on these validated data, a simplified design tool for early design stages is developed. It uses sun-path diagrams to define the annual hours of direct sunlight on windows in the main orientations (N, E, S, and W). This theoretical figure is corrected by the realistic percentage of sunshine hours taking into account the annual time of covered sky of typical climatic regions. Resulting actual hours of insolation (and light redirection) for the main window orientations are defined for a variation of latitudes and climates. Examples of typical office rooms located in latitudes between 0° and 60° and climates with varying cloudiness are used to demonstrate the sunlighting potential. The annual hours of sufficient lighting under clear sky conditions range between 700 and 1900. Resulting savings in lighting energy allow for the return of an investment of 50 to 100 €/m² glazing within 2 years for certain assumptions. The additional costs for the light redirecting micro-structures in the glass are not likely to exceed this range.

show abstract

Evaluation of PV integrated sliding-rotating overhangs for US apartment buildings

Krarti

2021

Applied Energy

View full text Add to dashboard Cite

Annual Performance Assessment of Complex Fenestration Systems in Sunny Climates Using Advanced Computer Simulations

Cited by 12 publications

References 13 publications

Optimization of Bifacial Photovoltaics by Optical Systems Feasibility Study

Optimization of Bifacial Photovoltaics by Optical Systems Feasibility Study

Application of Micro-structured Sunlighting Systems in Different Climatic Zones

Evaluation of PV integrated sliding-rotating overhangs for US apartment buildings

Contact Info

Product

Resources

About