ASHRAE Journal - June 2012 - 101
Example 1 Small Box
(8 in. by 8 in. discharge, <300 cfm)
Example 2 Medium Box
(12 in. by 12 in. discharge, 300 – 700 cfm)
Example 3 Large Box
(15 in. by 15 in. discharge, >700 cfm)
Sound Pressure Level Without End Reflection Hz 125 250 500 1000 2000 4000 NC dB 35 30 17 0 –12 2 16
Sound Pressure Level With End Reflection dB 43 33 18 0 –12 2 23
Sound Pressure Level Without End Reflection dB 29 24 14 4 0 3 10
Sound Pressure Level With End Reflection dB 35 27 15 4 0 3 14
Sound Pressure Level Without End Reflection dB 33 38 24 13 12 24 27
Sound Pressure Level With End Reflection dB 37 39 24 13 12 24 27
table 1: Summary of examples showing effect of ERL on discharge sound pressure levels, dB. ensure the data includes end reflection. The sound power levels and resulting NC calculated per Table E1 in AHRI Standard 885-2008 may be different if the data contains end reflection. for a document detailing the change to include ERL. Mike Woodford, AHRI Staff Liaison to the ACDD committee, contributed to this article. David A. John, P.E., is chief engineer; Luis Villegas is development and testing engineer for Metal Industries, Clearwater, Fla.
Acknowledgments
This article is the result of AHRI’s Air Control and Distribution Devices committee (ACDD) determining the need
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June 2012
ASHRAE Journal
101
ASHRAE Journal - June 2012
Table of Contents for the Digital Edition of ASHRAE Journal - June 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Minimum Outdoor Airflow Using the IAQ Procedure
Basics of Atrium Smoke Control
Long-Term Commercial GSHP Performance Part 1: Project Overview and Loop Circuit Types
Optimizing Design & Control of Chilled Water Plants Part 5: Optimized Control Sequences
Technology Award Case Studies:
Retail in Cold Climate
Rethinking Hospital Design
Standing Columns
Refrigeration Applications
Emerging Technologies
Engineering Applications
Washington Report
Products
IAQ Applications
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - June 2012 - Intro
ASHRAE Journal - June 2012 - Cover1
ASHRAE Journal - June 2012 - Cover2
ASHRAE Journal - June 2012 - 1
ASHRAE Journal - June 2012 - 2
ASHRAE Journal - June 2012 - Contents
ASHRAE Journal - June 2012 - Commentary
ASHRAE Journal - June 2012 - 5
ASHRAE Journal - June 2012 - Industry News
ASHRAE Journal - June 2012 - 7
ASHRAE Journal - June 2012 - 8
ASHRAE Journal - June 2012 - 9
ASHRAE Journal - June 2012 - 10
ASHRAE Journal - June 2012 - 11
ASHRAE Journal - June 2012 - 12
ASHRAE Journal - June 2012 - 13
ASHRAE Journal - June 2012 - Letters
ASHRAE Journal - June 2012 - 15
ASHRAE Journal - June 2012 - 16
ASHRAE Journal - June 2012 - 17
ASHRAE Journal - June 2012 - 18
ASHRAE Journal - June 2012 - 19
ASHRAE Journal - June 2012 - 20
ASHRAE Journal - June 2012 - 21
ASHRAE Journal - June 2012 - 22
ASHRAE Journal - June 2012 - 23
ASHRAE Journal - June 2012 - Meetings and Shows
ASHRAE Journal - June 2012 - 25
ASHRAE Journal - June 2012 - Minimum Outdoor Airflow Using the IAQ Procedure
ASHRAE Journal - June 2012 - 27
ASHRAE Journal - June 2012 - 28
ASHRAE Journal - June 2012 - 29
ASHRAE Journal - June 2012 - 30
ASHRAE Journal - June 2012 - 31
ASHRAE Journal - June 2012 - 32
ASHRAE Journal - June 2012 - 33
ASHRAE Journal - June 2012 - 34
ASHRAE Journal - June 2012 - 35
ASHRAE Journal - June 2012 - Basics of Atrium Smoke Control
ASHRAE Journal - June 2012 - 37
ASHRAE Journal - June 2012 - 38
ASHRAE Journal - June 2012 - 39
ASHRAE Journal - June 2012 - 40
ASHRAE Journal - June 2012 - 41
ASHRAE Journal - June 2012 - 42
ASHRAE Journal - June 2012 - 43
ASHRAE Journal - June 2012 - 44
ASHRAE Journal - June 2012 - 45
ASHRAE Journal - June 2012 - 46
ASHRAE Journal - June 2012 - 47
ASHRAE Journal - June 2012 - Long-Term Commercial GSHP Performance Part 1: Project Overview and Loop Circuit Types
ASHRAE Journal - June 2012 - 49
ASHRAE Journal - June 2012 - 50
ASHRAE Journal - June 2012 - 51
ASHRAE Journal - June 2012 - 52
ASHRAE Journal - June 2012 - 53
ASHRAE Journal - June 2012 - 54
ASHRAE Journal - June 2012 - 55
ASHRAE Journal - June 2012 - Optimizing Design & Control of Chilled Water Plants Part 5: Optimized Control Sequences
ASHRAE Journal - June 2012 - 57
ASHRAE Journal - June 2012 - 58
ASHRAE Journal - June 2012 - 59
ASHRAE Journal - June 2012 - 60
ASHRAE Journal - June 2012 - 61
ASHRAE Journal - June 2012 - 62
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ASHRAE Journal - June 2012 - 73
ASHRAE Journal - June 2012 - 74
ASHRAE Journal - June 2012 - 75
ASHRAE Journal - June 2012 - Retail in Cold Climate
ASHRAE Journal - June 2012 - 77
ASHRAE Journal - June 2012 - 78
ASHRAE Journal - June 2012 - 79
ASHRAE Journal - June 2012 - 80
ASHRAE Journal - June 2012 - 81
ASHRAE Journal - June 2012 - 82
ASHRAE Journal - June 2012 - 83
ASHRAE Journal - June 2012 - Rethinking Hospital Design
ASHRAE Journal - June 2012 - 85
ASHRAE Journal - June 2012 - 86
ASHRAE Journal - June 2012 - 87
ASHRAE Journal - June 2012 - 88
ASHRAE Journal - June 2012 - 89
ASHRAE Journal - June 2012 - 90
ASHRAE Journal - June 2012 - 91
ASHRAE Journal - June 2012 - 92
ASHRAE Journal - June 2012 - 93
ASHRAE Journal - June 2012 - Refrigeration Applications
ASHRAE Journal - June 2012 - 95
ASHRAE Journal - June 2012 - Emerging Technologies
ASHRAE Journal - June 2012 - 97
ASHRAE Journal - June 2012 - 98
ASHRAE Journal - June 2012 - 99
ASHRAE Journal - June 2012 - Engineering Applications
ASHRAE Journal - June 2012 - 101
ASHRAE Journal - June 2012 - 102
ASHRAE Journal - June 2012 - Washington Report
ASHRAE Journal - June 2012 - Products
ASHRAE Journal - June 2012 - 105
ASHRAE Journal - June 2012 - IAQ Applications
ASHRAE Journal - June 2012 - 107
ASHRAE Journal - June 2012 - 108
ASHRAE Journal - June 2012 - Special Products
ASHRAE Journal - June 2012 - 110
ASHRAE Journal - June 2012 - Classified Advertising
ASHRAE Journal - June 2012 - Advertisers Index
ASHRAE Journal - June 2012 - Cover3
ASHRAE Journal - June 2012 - Cover4
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