IEVref:845-29-073ID:
Language:enStatus: Standard
Term: ceiling cavity index
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Symbol: Kc
K
Definition: quotient of the sum of the areas of the ceiling and the plane of the luminaires and the sum of the area of the walls bounded by the ceiling and the plane of the luminaires, used in the calculation of the utilization factor or utilance

Note 1 to entry: The ceiling cavity index is given by the formula

K c = ab h c (a+b) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadUeadaWgaaWcbaGaae4yaaqabaGccqGH9aqpdaWcaaqaaiaadgga caaMc8UaamOyaaqaaiaadIgadaWgaaWcbaGaae4yaaqabaGccaaMe8 UaaiikaiaadggacqGHRaWkcaWGIbGaaiykaaaaaaa@4511@

where a and b are the dimensions of the sides of the room and hc is the distance from the ceiling to the plane of the luminaires.

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

Note 3 to entry: The ceiling cavity index has unit one.


Publication date:2020-12
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