Results Viewer - Daylit Area/Spatial Daylight Autonomy

The IES Daylight Metrics Committee recently published a new metric that describes very well “How much of “of a certain” space or building is adequately daylit?” [IES] Spatial Daylight Autonomy [THRESHOLD/50%] has been selected as the metric for analysis of daylight sufficiency. This metric means that a certain illuminance threshold has to be achieved at least 50% of the occupied hours to consider a space adequately daylit. This can then be reported as daylit area or a percentage of floor area that is daylight. The procedure has two advantages: On one hand it can provide significant information even if condensed to one number; e.g.”70% of the design variant’s area is daylit”. On the other hand it can also be used pointwise to directly highlight areas that are underperforming. This relates more directly to the built geometry.

Daylit Area Meshes

Daylit Area Tab

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In Short

Umi is a Rhino-based design environment for architects and urban planners interested in modeling the environmental performance of neighborhoods and cities with respect to operational and embodied energy use, walkability and daylighting potential. Since 2012, Umi has been  developed by the Sustainable Design Lab at the Massachusetts Institute of Technology with support from a National Science Foundation EFRI_SEED project, the MIT Energy Initiative, the Kuwait-MIT Center, the Center for Complex Engineering Systems (CCES) at KACST and MIT, Transsolar Climate Engineering and United Technologies Corporation. Further tool developed is now also being conducted at the Environmental Systems Lab at Cornell University.

A first public version of Umi was released during a public symposium on Sustainable Urban Design on May 6th 2013 at the Massachusetts Institute of Technology. Version 2.0, which also includes an embodied energy module, was released on November 7th 2014.

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