In the DALEC research project, an online concept analysis tool is being developed for architects, civil engineers, lighting designers and building owners, which, despite its ease of use and short calculation times, maps the complex lighting and thermal processes in a building and clearly evaluates heating, cooling and artificial lighting requirements. In addition, user behaviour (e.g. glare protection) is taken into account and visual and thermal comfort criteria are analysed. This new and innovative, holistic approach enables sustainable and energy-efficient design planning for new builds and refurbishments.
In the early planning phases, concept variants can be quickly checked for general functionality and compared with each other in terms of monthly and annual artificial lighting requirements. In addition, the effects of the daylight artificial lighting system on the heating and cooling loads of the room configuration are determined using a dynamic building model. The system is partly based on simplified algorithms and calculation methods. The parameters simulated and calculated in advance are available in tabular form.
For the daylight input, simulation results for typical room and window situations are stored in a matrix. For each measuring point, the results are combined with location-based climate data in order to make statements about the hourly daylight input. The calculation of the artificial lighting requirement in relation to a user-specific target illuminance for typical room situations is carried out for representative radiation characteristics. The simulated lighting efficiencies are stored in a matrix. Different weightings of the direct and indirect components can be selected, as well as dimming characteristics for common lamp types. The hour-based daylight input for a measuring range near and far from the window is taken into account when determining the artificial lighting requirement and the resulting connected load. The heating and cooling requirements are calculated from the solar input and artificial light loads using a dynamic building model and specifying the selected indoor temperature limits. By specifying the orientation and insulation properties of the façades with the corresponding window area and the storage capacity of the building, it is possible to draw conclusions about the expected total energy requirement.
Simple handling and low input effort allow the planner a time-saving plausibility verification of early design variants, which increases planning reliability in the integrated daylight and artificial lighting concept.
Publications (University of Innsbruck)
Werner, M. (2014). Lighting: Tool for the evaluation of daylight utilisation. In 51st meeting of the working group on cost-effective passive houses. Darmstadt.
Werner, M., Geisler-Moroder, D., Ebert, O., Bauer, C., Müller, R., Junghans, B., & Weitlaner, R. (2014). DALEC - Day- and Artificial Light with Energy Calculation - Concept analysis tool for holistic lighting design. In Light 2014. The Hague.
Werner, M., Geisler-Moroder, D., Junghans, B., & Ebert, O. (2015). DALEC - Calculation of the daylight input including the influence of occupant behaviour. In BauZ! Vienna Congress for Future Building. Vienna.
Werner, M., Gopp, S., Geisler-Moroder, D., Junghans, B., & Ebert, O. (2015). Simplified façade planning with regard to artificial lighting, heating and cooling requirements. In 19th International Passive House Conference. Leipzig.
