ASHRAE Journal - March 2021 - 60

TECHNICAL FEATURE

FIGURE 2 Three scenarios of plug load schedules for school buildings on a) weekdays and b) weekends. (B1 - B8 refer to average daily plug load profiles for each of the eight
buildings monitored in Srinivasan, et al.15)

1.0
0.8

0.6
0.4

B1 - B8
Low
Medium
High
NECB Baseline

0.6
0.4

0.2

0.2

0.0

0.0

00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00

Diversity Factor

0.8

B.

B1 - B8
Low
Medium
High
NECB Baseline

Diversity Factor

1.0

00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00

A.

Time

Time

FIGURE 3 Three scenarios of plug load schedules for MURBs on a) weekdays and b) weekends. (B1 - B22 refer to average daily plug load profiles for each of the 22 buildings
monitored in Saldanha and Beausoleil-Morrison.18)

0.6

0.8

0.4

0.6

B1 - B22
Low
Medium
High
NECB Baseline

0.4

0.2

0.2

0.0

0.0
00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00

Diversity Factor

0.8

B. 1.0

B1 - B22
Low
Medium
High
NECB Baseline

Diversity Factor

1.0

00:00
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00

A.

Time

Time

Across all of the considered archetypes, the median
TABLE 4 Equipment power density under
TABLE 5 Equipment power density under
three scenarios for school buildings.
three scenarios for MURBs.
and range of variations in EUI was highest in
2)
EPD
(W/FT
EPD (W/FT 2)
Climate Zone 4 (warmest climate: <3,000 heating
Low
Medium
High
Low Medium
High
degree days) and lowest in Climate Zone 8 (coldest
0.95
1.45
1.96
0.41
0.52
0.74
climate: >7,000 heating degree days).
To further analyze simulation results, Figure 5
shows the range of percentage variations in EUI relative
significantly larger in large office buildings (>70%). EUI
to the baseline of the three different versions of NECB,
in these buildings was also found to be less sensitive to
across the considered plug load use scenarios and cliweather conditions relative to plug loads since they have
mate zones. Results indicate the median and range of
a lower surface area to volume ratio.
variations in EUI was relatively larger in simulations
Irrespective of the approach used to evaluate the impact
using NECB 2017 as the baseline across the different
of plug load assumptions on simulated EUI, results indiarchetypes. These findings suggest that more stringent
cate these assumptions have a significant effect, particuefficiency requirements increased the impact of plug
larly in milder climates and for newer (more stringent)
loads on energy use. Since EPD was assigned based
code versions. Since compliance with NECB can be based
on floor area, their impact on overall energy use was
on dynamic performance simulation, inappropriate plug
60

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ASHRAE Journal - March 2021

Table of Contents for the Digital Edition of ASHRAE Journal - March 2021

Contents
ASHRAE Journal - March 2021 - Intro
ASHRAE Journal - March 2021 - Cover1
ASHRAE Journal - March 2021 - Cover2
ASHRAE Journal - March 2021 - 1
ASHRAE Journal - March 2021 - Contents
ASHRAE Journal - March 2021 - 3
ASHRAE Journal - March 2021 - 4
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