A first suggestion on how to make Climate-Based Daylight Modelling through Radiance simple and available to the Danish building industry and how to validate Climate-Based Daylight Modelling

Bartholdy, Mie Mårup

4. term

Indoor Environmental and Energy Engineering, Master

2023

2023-10-09

65 pages

A method on how to make climate-based daylight modelling (CBDM) accessible to the Danish building industry has been proposed in this thesis. Accessible being twofold: user- friendly without the necessity of expert knowledge and inexpensive. This could enhance the use of CBDM in the industry. The proposed method includes three main investigated aspects supported by a literature study of annual daylight metrics and a thorough investigation of Radiance. Radiance was chosen as a focal point, as it is considered to provide the true results in CBDM, due to its extensive validation showing its ability to provide accurate physically realistic results. Firstly, the Radiance 3- and 4-Phase Methods were chosen for calculation of yearly indoor illuminance estimations based on typical meteorological year (TMY) weather data. The methods were found to be the most agile and fast for the investigation of dynamic solar shading and various fenestration systems. The second aspect in this thesis regarding the proposed method of making CBDM accessible includes the choice of parameter settings. The ambient parameters have a major impact on the accuracy of the simulation results. The suggested settings are based on a literature review of previous studies. The third aspect is the principle of how to incorporate Radiance CBDM with thermal comfort and energy use simulations in BSim. This compilation allowing for integrated design should enhance the accuracy of the estimation of the building performance. Such a compilation makes it possible to take the effect of daylighting including dynamic solar shading into account for the use of artificial lighting and heat loads for thermal simulations. This allows for the potential of lowering energy use and enhancing the indoor climate of building designs. Furthermore, a study to map existing datasets for validation of climate-based daylight modelling tools and parameter settings is included. This is to provide the industry with recommendations for future practice, where no benchmark model or method is well-known or available. The study identifies the difficulties in the acquisition of existing datasets for validation and their uncertainties or deficiencies. The study also guided the process of verifying the proposed method to use for general CBDM. The proposed method has been tested and comparatively verified against two Radiance methods.

CBDM

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