ASHRAE Journal - December 2022 - 57
TECHNICAL FEATURE
FIGURE 10 Two ways of decomposing a space.
FIGURE 11 An example table of the maximum allowable cfm.
have been addressed, we can formulate a streamlined
and consistent process:
1. Select a diffuser manufacturer and model based on
performance, material, aesthetics, cost, availability and
local support.
2. Determine an acceptable noise criteria (NC) rating
for the space and use the catalog to build a table of maximum
allowable cfm for each neck size at the acceptable
NC, such as the example in Figure 11.
3. Break complex spaces into rectangular subspaces
leaving the largest continuous area intact.
4. Assign subspace airfl ow, cfmSS, to each subspace in
proportion to the subspace's area, SSA, to the total space
area, SA.
5. Decrease the characteristic length by increasing
the number of diffusers, following the procedure in the
Characteristic Length section of this article.
6. Stop when the cfm/diffuser is below the allowable
cfm of the largest neck size, cfmMax. Assign the smallest
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ASHRAE Journal - December 2022
Table of Contents for the Digital Edition of ASHRAE Journal - December 2022
Contents
ASHRAE Journal - December 2022 - BB1
ASHRAE Journal - December 2022 - BB2
ASHRAE Journal - December 2022 - Cover1
ASHRAE Journal - December 2022 - Cover2
ASHRAE Journal - December 2022 - 1
ASHRAE Journal - December 2022 - Contents
ASHRAE Journal - December 2022 - 3
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