Basic Documentation
Table Of Contents
- About this Application Guide
- Chapter 1–Introduction
- Chapter 2–Physics of Sound
- Chapter 3–HVAC Sound Sources
- Chapter 4–HVAC Sound Attenuation
- Introduction to HVAC Sound Attenuation
- Plenums
- Duct Attenuation
- Duct Takeoffs and Divisions
- Duct Silencers
- End Reflection
- Environment Adjustment Factor
- Space Effect
- Radiated Sound Attenuation
- Chapter 5–HVAC System Sound Analysis
- Chapter 6–Minimizing HVAC Sound
- Appendix
- Glossary
- Index
Purpose of this Guide
iv Siemens Building Technologies, Inc.
Chapter 6–Minimizing HVAC Sound 95
Introduction to Minimizing HVAC Sound 95
Basic System Design Criteria 95
Fans 96
Duct Configurations 97
Terminal Equipment 97
Sound Attenuation Devices 100
Passive Sound Attenuation Devices 100
Linings 100
Duct Silencers and Attenuators 100
Ceiling and Wall Absorbers 101
Enclosures 101
Active Sound Attenuation Devices 101
Sound Measurement Instrumentation 103
Sound Measurement Procedure 103
Appendix 105
NC and RC Curves, Tabular Listing 105
NC Curve 106
RC Curve 107
Sound Analysis Worksheet 108
Sound Measurement Worksheet 109
Glossary 111
Index 115