ASHRAE Journal - September 2011 - 38

Designing for Comfort
A
By David A. John, P.E., Member ASHRAE

Selecting Air-Distribution Outlets

Cost of Discomfort
A review of existing literature found that the effect of comfort on productivity generally covers ventilation rate and temperature. The literature suggests that the potential annual saving or productivity gain (in 1996 U.S. dollars) can be as much as $20 to $160 billion.1 The financial costs due to reduced productivity associated with occupants’ thermal discomfort are significantly greater than the costs due to the much publicized sick building syndrome.

great deal of time is spent designing a system, including sizing chillers and air handlers and laying out pumps and controls, but

how much time is spent selecting air-distribution devices? In conversations with design engineers, they estimate spending weeks and months laying out chillers, air handlers, controls and ductwork, but estimate they spend only minutes selecting and laying out air-distribution devices. Most of the HVAC consulting engineer’s time is spent designing a system to meet the required ventilation rate and space temperature, but occupant discomfort can still occur if the space air velocity is too high.

Mixed Air-Distribution System
One factor that is commonly overlooked in an air-distribution system design is the resulting room air velocities About the Author
David A. John, P.E., is chief engineer for Metal Industries in Clearwater, Fla. He is an ASHRAE Distinguished Lecturer, a member of ASHRAE TC 5.3, Room Air Distribution, and chair of SPC 129, Measuring Air-Change Effectiveness.

The tendency of designers is to add more air-distribution devices, spaced closely together, as a margin of safety for a project. Using proper air-distribution device selection methods can greatly improve occupant comfort, and reduce the number
38 ASHRAE Journal

of devices. This has the added value of reducing the amount of ductwork required and the associated accessories and labor. These savings can be accomplished by the designer without a significant amount of additional design time.
ashrae.org

September 2011



ASHRAE Journal - September 2011

Table of Contents for the Digital Edition of ASHRAE Journal - September 2011

Contents
Commentary
Industry News
Meetings and Shows
Feature Articles
Adsorption Refrigeration: New Opportunities for Solar
Optimizing Design & Control of Chilled Water Plants—Part 2: Condenser Water System Design
Designing for Comfort: Selecting Air-Distribution Outlets
Technology Award Case Studies
Library Sets Example
Sustainable Campus
Standing Columns
Building Sciences
IAQ Applications
Emerging Technologies
Products
Classified Advertising
Advertisers Index
Special Supplement: AMCA International inmotion Magazine
ASHRAE Journal - September 2011 - Intro
ASHRAE Journal - September 2011 - Cover1
ASHRAE Journal - September 2011 - Cover2
ASHRAE Journal - September 2011 - 1
ASHRAE Journal - September 2011 - 2
ASHRAE Journal - September 2011 - Contents
ASHRAE Journal - September 2011 - Commentary
ASHRAE Journal - September 2011 - 5
ASHRAE Journal - September 2011 - Industry News
ASHRAE Journal - September 2011 - 7
ASHRAE Journal - September 2011 - 8
ASHRAE Journal - September 2011 - 9
ASHRAE Journal - September 2011 - Meetings and Shows
ASHRAE Journal - September 2011 - 11
ASHRAE Journal - September 2011 - 12
ASHRAE Journal - September 2011 - 13
ASHRAE Journal - September 2011 - Adsorption Refrigeration: New Opportunities for Solar
ASHRAE Journal - September 2011 - 15
ASHRAE Journal - September 2011 - 16
ASHRAE Journal - September 2011 - 17
ASHRAE Journal - September 2011 - 18
ASHRAE Journal - September 2011 - 19
ASHRAE Journal - September 2011 - 20
ASHRAE Journal - September 2011 - 21
ASHRAE Journal - September 2011 - 22
ASHRAE Journal - September 2011 - 23
ASHRAE Journal - September 2011 - 24
ASHRAE Journal - September 2011 - 25
ASHRAE Journal - September 2011 - Optimizing Design & Control of Chilled Water Plants—Part 2: Condenser Water System Design
ASHRAE Journal - September 2011 - 27
ASHRAE Journal - September 2011 - 28
ASHRAE Journal - September 2011 - 29
ASHRAE Journal - September 2011 - 30
ASHRAE Journal - September 2011 - 31
ASHRAE Journal - September 2011 - 32
ASHRAE Journal - September 2011 - 32A
ASHRAE Journal - September 2011 - 32B
ASHRAE Journal - September 2011 - 33
ASHRAE Journal - September 2011 - 34
ASHRAE Journal - September 2011 - 35
ASHRAE Journal - September 2011 - 36
ASHRAE Journal - September 2011 - 37
ASHRAE Journal - September 2011 - Designing for Comfort: Selecting Air-Distribution Outlets
ASHRAE Journal - September 2011 - 39
ASHRAE Journal - September 2011 - 40
ASHRAE Journal - September 2011 - 41
ASHRAE Journal - September 2011 - 42
ASHRAE Journal - September 2011 - 43
ASHRAE Journal - September 2011 - 44
ASHRAE Journal - September 2011 - 45
ASHRAE Journal - September 2011 - 46
ASHRAE Journal - September 2011 - 47
ASHRAE Journal - September 2011 - Library Sets Example
ASHRAE Journal - September 2011 - 49
ASHRAE Journal - September 2011 - 50
ASHRAE Journal - September 2011 - 51
ASHRAE Journal - September 2011 - 52
ASHRAE Journal - September 2011 - 53
ASHRAE Journal - September 2011 - Sustainable Campus
ASHRAE Journal - September 2011 - 55
ASHRAE Journal - September 2011 - 56
ASHRAE Journal - September 2011 - 57
ASHRAE Journal - September 2011 - 58
ASHRAE Journal - September 2011 - 59
ASHRAE Journal - September 2011 - 60
ASHRAE Journal - September 2011 - 61
ASHRAE Journal - September 2011 - 62
ASHRAE Journal - September 2011 - 63
ASHRAE Journal - September 2011 - Building Sciences
ASHRAE Journal - September 2011 - 65
ASHRAE Journal - September 2011 - 66
ASHRAE Journal - September 2011 - 67
ASHRAE Journal - September 2011 - 68
ASHRAE Journal - September 2011 - 69
ASHRAE Journal - September 2011 - 70
ASHRAE Journal - September 2011 - 71
ASHRAE Journal - September 2011 - 72
ASHRAE Journal - September 2011 - 73
ASHRAE Journal - September 2011 - 74
ASHRAE Journal - September 2011 - 75
ASHRAE Journal - September 2011 - IAQ Applications
ASHRAE Journal - September 2011 - 77
ASHRAE Journal - September 2011 - 78
ASHRAE Journal - September 2011 - 79
ASHRAE Journal - September 2011 - 80
ASHRAE Journal - September 2011 - Special Supplement: AMCA International inmotion Magazine
ASHRAE Journal - September 2011 - AMCACover2
ASHRAE Journal - September 2011 - AMCA3
ASHRAE Journal - September 2011 - AMCA4
ASHRAE Journal - September 2011 - AMCA5
ASHRAE Journal - September 2011 - AMCA6
ASHRAE Journal - September 2011 - AMCA7
ASHRAE Journal - September 2011 - AMCA8
ASHRAE Journal - September 2011 - AMCA9
ASHRAE Journal - September 2011 - AMCA10
ASHRAE Journal - September 2011 - AMCA11
ASHRAE Journal - September 2011 - AMCA12
ASHRAE Journal - September 2011 - AMCA13
ASHRAE Journal - September 2011 - AMCA14
ASHRAE Journal - September 2011 - AMCA15
ASHRAE Journal - September 2011 - AMCA16
ASHRAE Journal - September 2011 - AMCA17
ASHRAE Journal - September 2011 - AMCA18
ASHRAE Journal - September 2011 - AMCA19
ASHRAE Journal - September 2011 - AMCA20
ASHRAE Journal - September 2011 - AMCA21
ASHRAE Journal - September 2011 - AMCA22
ASHRAE Journal - September 2011 - AMCA23
ASHRAE Journal - September 2011 - AMCA24
ASHRAE Journal - September 2011 - AMCA25
ASHRAE Journal - September 2011 - AMCA26
ASHRAE Journal - September 2011 - AMCACover3
ASHRAE Journal - September 2011 - AMCACover4
ASHRAE Journal - September 2011 - Emerging Technologies
ASHRAE Journal - September 2011 - 82
ASHRAE Journal - September 2011 - 83
ASHRAE Journal - September 2011 - 84
ASHRAE Journal - September 2011 - 85
ASHRAE Journal - September 2011 - 86
ASHRAE Journal - September 2011 - 87
ASHRAE Journal - September 2011 - 88
ASHRAE Journal - September 2011 - Products
ASHRAE Journal - September 2011 - 90
ASHRAE Journal - September 2011 - 91
ASHRAE Journal - September 2011 - 92
ASHRAE Journal - September 2011 - 93
ASHRAE Journal - September 2011 - Classified Advertising
ASHRAE Journal - September 2011 - 95
ASHRAE Journal - September 2011 - Advertisers Index
ASHRAE Journal - September 2011 - Cover3
ASHRAE Journal - September 2011 - Cover4
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