ASHRAE Journal - May 2022 - 19

TECHNICAL FEATURE
FIGURE 3 Weekly breakdown of EOA sources for an office building in various climates. Values are averaged over the occupied period for each week in one year of operation.
Labeled energy costs are relative to baseline operation averaged over the whole year.
4
3
2
1
4
3
2
1
5
4
3
2
1
4
3
2
1
-8.7% Energy Cost
0.0% Energy Cost
+19.2% Energy Cost
+0.3% Energy Cost
-3.2% Energy Cost
0.5× Minimum Ventilation
-16.5% Energy Cost
ASHRAE Baseline
0.0% Energy Cost
2× Minimum Ventilation
+62.3% Energy Cost
MERV 13 Filter
+0.4% Energy Cost
Higher Supply Temperature
-0.4% Energy Cost
-14.6% Energy Cost
0.0% Energy Cost
+32.5% Energy Cost
+0.3% Energy Cost
-10.0% Energy Cost
-1.7% Energy Cost
0.0% Energy Cost
+53% Energy Cost
+0.7% Energy Cost
-8.2% Energy Cost
J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D
Economizer
Minimum Ventilation
Filtration
returns exist for each strategy, and the associated maximum
EOA delivery is limited by the total supply airfl ow
provided by the HVAC system. Because none of the variables
in the fi rst four columns change supply fl ow, they
all have the same upper bound. By contrast, the higher
supply temperature setpoint in the fi nal column does
increase total supply fl ow and thus also the maximum
possible EOA delivery.
Indeed, we note that combining the higher supply
temperature with a MERV 13 fi lter would provide
considerably more EOA compared to the baseline case
(almost the maximum value indicated by the black line).
However, some care is needed when adjusting supply
Deactivation
Deposition
Maximum EOA
temperature to ensure that occupant comfort is not
sacrifi ced. The primary concern is that a higher supply
temperature will provide inadequate dehumidifi cation.
To assess this possibility, Figure 4 shows the distribution
of zone relative humidity and dew point for the hot
humid climate, which clearly illustrates the increase
in humidity associated with this strategy. Given that
there is not signifi cant time spent above 65°F (18°C)
dew point, the higher supply temperature would almost
always be acceptable in this building under ASHRAE
standards.23 However, spaces with higher occupant
densities and higher moisture loads may not be able to
tolerate 62°F (17°C) supply air. (For this reason, ASHRAE
M AY 2 0 2 2 ashrae.o rg ASHRAE JOURNAL
19
Marine Climate EOA (ACH)
Hot Dry Climate EOA (ACH) Hot Humid Climate EOA (ACH)
Cold Climate EOA (ACH)

http://ashrae.org

ASHRAE Journal - May 2022

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

Contents
ASHRAE Journal - May 2022 - Intro
ASHRAE Journal - May 2022 - Cover1
ASHRAE Journal - May 2022 - Cover2
ASHRAE Journal - May 2022 - 1
ASHRAE Journal - May 2022 - Contents
ASHRAE Journal - May 2022 - 3
ASHRAE Journal - May 2022 - 4
ASHRAE Journal - May 2022 - 5
ASHRAE Journal - May 2022 - 6
ASHRAE Journal - May 2022 - 7
ASHRAE Journal - May 2022 - 8
ASHRAE Journal - May 2022 - 9
ASHRAE Journal - May 2022 - 10
ASHRAE Journal - May 2022 - 11
ASHRAE Journal - May 2022 - 12
ASHRAE Journal - May 2022 - 13
ASHRAE Journal - May 2022 - 14
ASHRAE Journal - May 2022 - 15
ASHRAE Journal - May 2022 - 16
ASHRAE Journal - May 2022 - 17
ASHRAE Journal - May 2022 - 18
ASHRAE Journal - May 2022 - 19
ASHRAE Journal - May 2022 - 20
ASHRAE Journal - May 2022 - 21
ASHRAE Journal - May 2022 - 22
ASHRAE Journal - May 2022 - 23
ASHRAE Journal - May 2022 - 24
ASHRAE Journal - May 2022 - 25
ASHRAE Journal - May 2022 - 26
ASHRAE Journal - May 2022 - 27
ASHRAE Journal - May 2022 - 28
ASHRAE Journal - May 2022 - 29
ASHRAE Journal - May 2022 - 30
ASHRAE Journal - May 2022 - 31
ASHRAE Journal - May 2022 - 32
ASHRAE Journal - May 2022 - 33
ASHRAE Journal - May 2022 - 34
ASHRAE Journal - May 2022 - 35
ASHRAE Journal - May 2022 - 36
ASHRAE Journal - May 2022 - 37
ASHRAE Journal - May 2022 - 38
ASHRAE Journal - May 2022 - 39
ASHRAE Journal - May 2022 - 40
ASHRAE Journal - May 2022 - 41
ASHRAE Journal - May 2022 - 42
ASHRAE Journal - May 2022 - 43
ASHRAE Journal - May 2022 - 44
ASHRAE Journal - May 2022 - 45
ASHRAE Journal - May 2022 - 46
ASHRAE Journal - May 2022 - 47
ASHRAE Journal - May 2022 - 48
ASHRAE Journal - May 2022 - 49
ASHRAE Journal - May 2022 - 50
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ASHRAE Journal - May 2022 - 65
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ASHRAE Journal - May 2022 - 67
ASHRAE Journal - May 2022 - 68
ASHRAE Journal - May 2022 - 69
ASHRAE Journal - May 2022 - 70
ASHRAE Journal - May 2022 - 71
ASHRAE Journal - May 2022 - 72
ASHRAE Journal - May 2022 - Cover3
ASHRAE Journal - May 2022 - Cover4
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