IEVref:845-29-071ID:
Language:enStatus: Standard
Term: room index
Synonym1: installation index
Synonym2:
Synonym3:
Symbol: K
Definition: quotient of the sum of the areas of the working plane and the plane of the luminaires and the sum of the area of the walls bounded by the working plane and the plane of the luminaires, used in the calculation of the utilization factor or utilance

Note 1 to entry: The room index is expressed by the formula

K= ab h( a+b ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadUeacqGH9aqpdaWcaaqaaiaadggacaaMc8UaamOyaaqaaiaadIga daqadaqaaiaadggacqGHRaWkcaWGIbaacaGLOaGaayzkaaaaaaaa@417C@

where a and b are the dimensions of the sides of the room and h the mounting height, that is the distance between the working plane and the plane of the luminaires.

Note 2 to entry: See also "ceiling cavity index" and "floor cavity index".

Note 3 to entry: The room index has unit one.

Note 4 to entry: This entry was numbered 845-09-55 in IEC 60050-845:1987.


Publication date:2020-12
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