ASHRAE Journal - June 2013 - 70

engineer’s notebook
Figure 2 (left): Poorly adjusted/selected diffuser.
Figure 3 (right): Properly adjusted/selected
diffuser.

Failure to adjust slots in interior spaces
results in cold air being directed down on
occupants. This is always unacceptable.
I can’t begin to number the times I have
suffered in an ASHRAE technical meeting in a fancy hotel where there was a slot
overhead blowing cold air directly on me.
I have learned to wear a sport jacket in
all ASHRAE meetings. I am tempted to
take gloves and a scarf.
Adjusting a linear slot requires that the
design engineer state clearly in the design
documents that the slots must be adjusted,
per instructions, prior to balancing. When
adjusted from vertical to horizontal, the
pressure drop almost always increases
significantly, and must be accounted for
in the system balance.
While some may argue that a balancer
won’t do this even if required to, it is assured that if the engineer does not state
this requirement, it won’t happen. In
reality, the adjustment should probably
be done by the installing contractor. I
found one contractor who always adds
10 minutes per linear to his estimates to
allow for adjustment of the slots. Sadly,
he is in the minority. Failure to adjust
linear slots will almost always result in
stratification in the space, poor thermostat response (because the space is no
longer well mixed) and likely occupant
dissatisfaction.
The ball is in the court of the design
engineer who must specify the proper
adjustment and has responsibility for that
adjustment.
Dan Int-Hout is a chief engineer at
Krueger in Richardson, Texas. He is a
member of SSPC 55, SPC 129 and consultant to SSPC 62.1.

www.info.hotims.com/44633-65

70

ASHRAE Journal

June 2013



ASHRAE Journal - June 2013

Table of Contents for the Digital Edition of ASHRAE Journal - June 2013

ASHRAE Journal - June 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Standardizing Data for VFD Efficiency
Technical vs. Process Commissioning
Technology Award Case Studies:
Low EUI Community Hospital
Reheat for Medical Center
Standing Columns
Building Sciences
Data Centers
Emerging Technologies
Engineer's Notebook
IAQ Applications
Special Products
Refrigeration Applications
Energy Modeling
People
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - June 2013 - ASHRAE Journal - June 2013
ASHRAE Journal - June 2013 - Cover2
ASHRAE Journal - June 2013 - 1
ASHRAE Journal - June 2013 - 2
ASHRAE Journal - June 2013 - Contents
ASHRAE Journal - June 2013 - Commentary
ASHRAE Journal - June 2013 - 5
ASHRAE Journal - June 2013 - Industry News
ASHRAE Journal - June 2013 - 7
ASHRAE Journal - June 2013 - 8
ASHRAE Journal - June 2013 - 9
ASHRAE Journal - June 2013 - Letters
ASHRAE Journal - June 2013 - 11
ASHRAE Journal - June 2013 - Meetings and Shows
ASHRAE Journal - June 2013 - 13
ASHRAE Journal - June 2013 - 14
ASHRAE Journal - June 2013 - 15
ASHRAE Journal - June 2013 - Standardizing Data for VFD Efficiency
ASHRAE Journal - June 2013 - 17
ASHRAE Journal - June 2013 - 18
ASHRAE Journal - June 2013 - 19
ASHRAE Journal - June 2013 - 20
ASHRAE Journal - June 2013 - 21
ASHRAE Journal - June 2013 - 22
ASHRAE Journal - June 2013 - 23
ASHRAE Journal - June 2013 - 24
ASHRAE Journal - June 2013 - 25
ASHRAE Journal - June 2013 - 26
ASHRAE Journal - June 2013 - 27
ASHRAE Journal - June 2013 - Technical vs. Process Commissioning
ASHRAE Journal - June 2013 - 29
ASHRAE Journal - June 2013 - 30
ASHRAE Journal - June 2013 - 31
ASHRAE Journal - June 2013 - 32
ASHRAE Journal - June 2013 - 33
ASHRAE Journal - June 2013 - 34
ASHRAE Journal - June 2013 - 35
ASHRAE Journal - June 2013 - Low EUI Community Hospital
ASHRAE Journal - June 2013 - 37
ASHRAE Journal - June 2013 - 38
ASHRAE Journal - June 2013 - 39
ASHRAE Journal - June 2013 - 40
ASHRAE Journal - June 2013 - 41
ASHRAE Journal - June 2013 - 42
ASHRAE Journal - June 2013 - 43
ASHRAE Journal - June 2013 - 44
ASHRAE Journal - June 2013 - 45
ASHRAE Journal - June 2013 - Reheat for Medical Center
ASHRAE Journal - June 2013 - 47
ASHRAE Journal - June 2013 - 48
ASHRAE Journal - June 2013 - 49
ASHRAE Journal - June 2013 - 50
ASHRAE Journal - June 2013 - 51
ASHRAE Journal - June 2013 - Building Sciences
ASHRAE Journal - June 2013 - 53
ASHRAE Journal - June 2013 - 54
ASHRAE Journal - June 2013 - 55
ASHRAE Journal - June 2013 - 56
ASHRAE Journal - June 2013 - 57
ASHRAE Journal - June 2013 - Data Centers
ASHRAE Journal - June 2013 - 59
ASHRAE Journal - June 2013 - 60
ASHRAE Journal - June 2013 - 61
ASHRAE Journal - June 2013 - Emerging Technologies
ASHRAE Journal - June 2013 - 63
ASHRAE Journal - June 2013 - 64
ASHRAE Journal - June 2013 - 65
ASHRAE Journal - June 2013 - 66
ASHRAE Journal - June 2013 - 67
ASHRAE Journal - June 2013 - Engineer's Notebook
ASHRAE Journal - June 2013 - 69
ASHRAE Journal - June 2013 - 70
ASHRAE Journal - June 2013 - 71
ASHRAE Journal - June 2013 - IAQ Applications
ASHRAE Journal - June 2013 - 73
ASHRAE Journal - June 2013 - 74
ASHRAE Journal - June 2013 - 75
ASHRAE Journal - June 2013 - Special Products
ASHRAE Journal - June 2013 - 77
ASHRAE Journal - June 2013 - Refrigeration Applications
ASHRAE Journal - June 2013 - 79
ASHRAE Journal - June 2013 - Energy Modeling
ASHRAE Journal - June 2013 - 81
ASHRAE Journal - June 2013 - People
ASHRAE Journal - June 2013 - 83
ASHRAE Journal - June 2013 - Products
ASHRAE Journal - June 2013 - 85
ASHRAE Journal - June 2013 - 86
ASHRAE Journal - June 2013 - Classified Advertising
ASHRAE Journal - June 2013 - Advertisers Index
ASHRAE Journal - June 2013 - Cover3
ASHRAE Journal - June 2013 - Cover4
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