Computation accuracy analysis of indoor lighting simulation software based on BIM technology
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Abstract:
The integration of lighting profession and building information modelling (BIM) technology on the same platform is still in its infancy. DIALux evo 8.2 and ElumTools 2019.07 are currently the only indoor lighting simulation software that participate in BIM technology. The calculation accuracy of them were verified using the cases 5.2 to 5.8 in CIE171:2006-test cases to assess the accuracy of lighting computer programs which published by CIE (Commission Internationale de i'Eclairage). Then the advantages and disadvantages of them were analysed. The results show that 1) both of them have high accuracy in calculating the direct illuminance of point light source and area light source, and luminous flux conservation performance; 2) the accuracy of DIALux evo 8.2 is better than ElumTools 2019.07 when calculating the indirect illuminance of large-area diffuse reflection, occlusion and different reflectivity; 3) ElumTools 2019.07 has higher accuracy when calculating small-area diffuse reflection; 4) both of them have relatively low accuracy when calculating directional transmission performance. Based on the case study, it is further concluded that the core algorithm is the main cause of errors, and both of them have defects in information exchanges. The use of photon mapping algorithms to create a full information exchange interface between buildings and lighting will be the future direction of indoor lighting simulation software development based on BIM technology.
