![]() The environment affecting a building presents external loads of different kinds on the VB (i.e. loads from weather, city resources supply systems, sunlight access etc.), as does the usage of the building (i.e. change in utilization, user comfort profiles, user services and maintenance demands).
One external load, 'access load', rarely considered, is derived from the fact that digital data has a limited access life time,
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Per Christiansson 14.3.2002 (18.5.1999) [18.5.1999]