ASHRAE Journal - August 2022 - 24

TECHNICAL FEATURE
FIGURE 3 Algorithm operating cost versus baseline in test building.
Baseline Cost
6.00
5.00
4.00
3.00
2.00
1.00
0.00
Algorithm Cost
and humidities, as well as the
mixed and supply air temperatures.
Providing current utility rates also
allows it to adjust for dynamic pricing,
including demand response.
This data is to be held constant during
the optimization process. The
only variables that will be manipulated
are discharge volumes to each
zone, the supply air temperature,
and the percentage of outdoor air.
Thus, the model consists of these
fi xed parameters, the variables and
the functions and other values that
represents the objective function to minimize. (For more
detail on a similar cost function, see Raftery, et al.9)
Before optimization begins using the model, information
is harvested from the actual system. This includes
each zone's ventilation requirement (adjusted for DCV)
and its calculated sensible load. From the air handler,
the algorithm grabs outside and return air temperatures
relate them all to one another. (This is much simpler
than a full EnergyPlus model, and it can be used across
many systems with little additional effort.)
To optimize the model, the algorithm iteratively selects
a supply air temperature and percentage of outdoor air
to check. These govern the mixed and supply air temperatures
and enthalpies. Next, it sets each of the zone
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ASHRAE JOURNAL ashrae.o rg A U G U S T 2 0 2 2
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ASHRAE Journal - August 2022

Table of Contents for the Digital Edition of ASHRAE Journal - August 2022

Contents
ASHRAE Journal - August 2022 - Intro
ASHRAE Journal - August 2022 - Cover1
ASHRAE Journal - August 2022 - Cover2
ASHRAE Journal - August 2022 - 1
ASHRAE Journal - August 2022 - Contents
ASHRAE Journal - August 2022 - 3
ASHRAE Journal - August 2022 - 4
ASHRAE Journal - August 2022 - 5
ASHRAE Journal - August 2022 - 6
ASHRAE Journal - August 2022 - 7
ASHRAE Journal - August 2022 - 8
ASHRAE Journal - August 2022 - 9
ASHRAE Journal - August 2022 - 10
ASHRAE Journal - August 2022 - 11
ASHRAE Journal - August 2022 - 12
ASHRAE Journal - August 2022 - 13
ASHRAE Journal - August 2022 - 14
ASHRAE Journal - August 2022 - 15
ASHRAE Journal - August 2022 - 16
ASHRAE Journal - August 2022 - 17
ASHRAE Journal - August 2022 - 18
ASHRAE Journal - August 2022 - 19
ASHRAE Journal - August 2022 - 20
ASHRAE Journal - August 2022 - 21
ASHRAE Journal - August 2022 - 22
ASHRAE Journal - August 2022 - 23
ASHRAE Journal - August 2022 - 24
ASHRAE Journal - August 2022 - 25
ASHRAE Journal - August 2022 - 26
ASHRAE Journal - August 2022 - 27
ASHRAE Journal - August 2022 - 28
ASHRAE Journal - August 2022 - 29
ASHRAE Journal - August 2022 - 30
ASHRAE Journal - August 2022 - 31
ASHRAE Journal - August 2022 - 32
ASHRAE Journal - August 2022 - 33
ASHRAE Journal - August 2022 - 34
ASHRAE Journal - August 2022 - 35
ASHRAE Journal - August 2022 - 36
ASHRAE Journal - August 2022 - 37
ASHRAE Journal - August 2022 - 38
ASHRAE Journal - August 2022 - 39
ASHRAE Journal - August 2022 - 40
ASHRAE Journal - August 2022 - 41
ASHRAE Journal - August 2022 - 42
ASHRAE Journal - August 2022 - 43
ASHRAE Journal - August 2022 - 44
ASHRAE Journal - August 2022 - 45
ASHRAE Journal - August 2022 - 46
ASHRAE Journal - August 2022 - 47
ASHRAE Journal - August 2022 - 48
ASHRAE Journal - August 2022 - 49
ASHRAE Journal - August 2022 - 50
ASHRAE Journal - August 2022 - 51
ASHRAE Journal - August 2022 - 52
ASHRAE Journal - August 2022 - 53
ASHRAE Journal - August 2022 - 54
ASHRAE Journal - August 2022 - 55
ASHRAE Journal - August 2022 - 56
ASHRAE Journal - August 2022 - 57
ASHRAE Journal - August 2022 - 58
ASHRAE Journal - August 2022 - 59
ASHRAE Journal - August 2022 - 60
ASHRAE Journal - August 2022 - 61
ASHRAE Journal - August 2022 - 62
ASHRAE Journal - August 2022 - 63
ASHRAE Journal - August 2022 - 64
ASHRAE Journal - August 2022 - Cover3
ASHRAE Journal - August 2022 - Cover4
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