ASHRAE Journal - November 2014 - 30
TECHNICAL FEATURE
be tracked and assessed are still appropriate, and determine what metrics will be used to track performance
over time.
Verify Achievement of Current Facility Requirements
Initially, the OCx process will verify that the acceptable performance defined in the OCx plan is being
achieved. That process can range from manual viewing of trend data, to FDD systems, reviewing comfort complaint/trouble calls and internal surveys of
building occupants. Based on the results from the
verification process, building operators will discover
issues and investigate changes to get back on track to
achieve the CFR, while often further improving the
level of building performance.
When energy monitoring and
tracking is part of the OCx plan,
then a formal measurement and
verification (M&V) plan should be
part of the OCx plan.
Investigate Unacceptable Performance
or Outcome
When unacceptable performance
is identified, such as temperature
or relative humidity setpoints that
are not maintained, the cause of the
performance degradation must be
determined so that a resolution to
the problem can be established. It is
important to identify the root cause
of unacceptable performance so
that the true issue is identified and
resolved. Symptoms can lead the
commissioning professional to the
root cause; however, it is critically
important not to get sidetracked
by treating symptoms, but to focus
on identifying the root cause of the
problem.
Three examples using trends
to investigate unacceptable performance are shown in Figures
1 through 3. Figure 1 shows that
a change was made to a control
system that disabled a condenser
water reset control sequence for
a water cooled chiller. Instead of
the condenser water supply (leaving the cooling tower) resetting
based on the ambient air wet-bulb
temperature, a fixed setpoint of
65°F (18°C) was overridden, thus
eliminating the potential energy
www.info.hotims.com/49810-9
30
ASHRAE JOURNAL
ashrae.org
N OVEM BER 2014
ASHRAE Journal - November 2014
Table of Contents for the Digital Edition of ASHRAE Journal - November 2014
Contents
ASHRAE Journal - November 2014 - Cover1
ASHRAE Journal - November 2014 - Cover2
ASHRAE Journal - November 2014 - 1
ASHRAE Journal - November 2014 - 2
ASHRAE Journal - November 2014 - Contents
ASHRAE Journal - November 2014 - 4
ASHRAE Journal - November 2014 - 5
ASHRAE Journal - November 2014 - 6
ASHRAE Journal - November 2014 - 7
ASHRAE Journal - November 2014 - 8
ASHRAE Journal - November 2014 - 9
ASHRAE Journal - November 2014 - 10
ASHRAE Journal - November 2014 - 11
ASHRAE Journal - November 2014 - 12
ASHRAE Journal - November 2014 - 13
ASHRAE Journal - November 2014 - 14
ASHRAE Journal - November 2014 - 15
ASHRAE Journal - November 2014 - 16
ASHRAE Journal - November 2014 - 17
ASHRAE Journal - November 2014 - 18
ASHRAE Journal - November 2014 - 19
ASHRAE Journal - November 2014 - 20
ASHRAE Journal - November 2014 - 21
ASHRAE Journal - November 2014 - 22
ASHRAE Journal - November 2014 - 23
ASHRAE Journal - November 2014 - 24
ASHRAE Journal - November 2014 - 25
ASHRAE Journal - November 2014 - 26
ASHRAE Journal - November 2014 - 27
ASHRAE Journal - November 2014 - 28
ASHRAE Journal - November 2014 - 29
ASHRAE Journal - November 2014 - 30
ASHRAE Journal - November 2014 - 31
ASHRAE Journal - November 2014 - 32
ASHRAE Journal - November 2014 - 33
ASHRAE Journal - November 2014 - 34
ASHRAE Journal - November 2014 - 35
ASHRAE Journal - November 2014 - 36
ASHRAE Journal - November 2014 - 37
ASHRAE Journal - November 2014 - 38
ASHRAE Journal - November 2014 - 39
ASHRAE Journal - November 2014 - 40
ASHRAE Journal - November 2014 - 41
ASHRAE Journal - November 2014 - 42
ASHRAE Journal - November 2014 - 43
ASHRAE Journal - November 2014 - 44
ASHRAE Journal - November 2014 - 45
ASHRAE Journal - November 2014 - 46
ASHRAE Journal - November 2014 - 47
ASHRAE Journal - November 2014 - 48
ASHRAE Journal - November 2014 - 49
ASHRAE Journal - November 2014 - 50
ASHRAE Journal - November 2014 - 51
ASHRAE Journal - November 2014 - 52
ASHRAE Journal - November 2014 - 53
ASHRAE Journal - November 2014 - 54
ASHRAE Journal - November 2014 - 55
ASHRAE Journal - November 2014 - 56
ASHRAE Journal - November 2014 - 57
ASHRAE Journal - November 2014 - 58
ASHRAE Journal - November 2014 - 59
ASHRAE Journal - November 2014 - 60
ASHRAE Journal - November 2014 - 61
ASHRAE Journal - November 2014 - 62
ASHRAE Journal - November 2014 - 63
ASHRAE Journal - November 2014 - 64
ASHRAE Journal - November 2014 - 65
ASHRAE Journal - November 2014 - 66
ASHRAE Journal - November 2014 - 67
ASHRAE Journal - November 2014 - 68
ASHRAE Journal - November 2014 - 69
ASHRAE Journal - November 2014 - 70
ASHRAE Journal - November 2014 - 71
ASHRAE Journal - November 2014 - 72
ASHRAE Journal - November 2014 - 73
ASHRAE Journal - November 2014 - 74
ASHRAE Journal - November 2014 - 75
ASHRAE Journal - November 2014 - 76
ASHRAE Journal - November 2014 - 77
ASHRAE Journal - November 2014 - 78
ASHRAE Journal - November 2014 - 79
ASHRAE Journal - November 2014 - 80
ASHRAE Journal - November 2014 - 81
ASHRAE Journal - November 2014 - 82
ASHRAE Journal - November 2014 - 83
ASHRAE Journal - November 2014 - 84
ASHRAE Journal - November 2014 - 85
ASHRAE Journal - November 2014 - 86
ASHRAE Journal - November 2014 - 87
ASHRAE Journal - November 2014 - 88
ASHRAE Journal - November 2014 - 89
ASHRAE Journal - November 2014 - 90
ASHRAE Journal - November 2014 - 91
ASHRAE Journal - November 2014 - 92
ASHRAE Journal - November 2014 - 93
ASHRAE Journal - November 2014 - 94
ASHRAE Journal - November 2014 - 95
ASHRAE Journal - November 2014 - 96
ASHRAE Journal - November 2014 - Cover3
ASHRAE Journal - November 2014 - Cover4
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