Chapter hvac engineering Fundamentals: Part 1 Introduction

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Chapter Twenty
TABLE
20.3 Recommended Indoor Design Goals for
Air Conditioning Sound Control
NOTE
: These are for
unoccupied
spaces, with all systems
operating.
SOURCE
: Copyright 1987, American Society of Heating,
Refrigerating and Air Conditioning Engineers, Inc., www.
ashrae.org. Reprinted by permission from ASHRAE Hand-
book,
1987 HVAC Systems and Applications;
subsequent edi-
tions are similar, i.e.,
2001 Fundamentals,
Chap. 7, Table 11.
of the HVAC systems, the HVAC designer is not generally very con-
cerned with sound attenuation in these environments.
20.5.4
A-weighted sound-level criteria
The A-weighted sound level (abbreviated dbA) is a simple, single-
number method of stating a design goal. Its usefulness is limited be-
cause it conveys no information on the sound spectrum—the sound
Engineering Fundamentals: Part 5
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