ASHRAE Journal - June 2020 - 38

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

DRY BULB
TEMPERATURE

RELATIVE
HUMIDITY

TEMP & HUMIDITY
CLASSIFICATION

AA+

70°F ±2°F

50% ±3%

Most Critical

AA

70°F ±4°F

50% ±5%

Critical

A

70°F ±4°F

50% ±10%

Critical w/
Seasonal Offsets

B

70°F ±9°F

50% ±10%

Collections
Buffer Zone

B
AA
AA
Human
Comfort

AA+

B

B

AA

FIGURE 9 Environmental control classiﬁcations.

71.5
71.0

Space Temperature (°F)

70.5
70.0
69.5
69.0
68.5
68.0
0

10

20

30
40
Space Humidity

50

60

70

FIGURE 11 Average of January 2019 critical temperature and humidity trends.

Figure 10 Virtual design model vs. as-built.

for energy-efﬁciency measures, with simple paybacks
in fewer than seven years. In early phases, pricing
energy and studies concluded that a water-cooled
chiller was the most effective cooling system, with
a simple payback of 4.6 years over air-cooled chillers, and condensing boilers were established as the
appropriate heating system. Further design reﬁnements were analyzed, such as solar PV, solar hotwater heating, total energy recovery air-handling
38

ASHRAE JOURNAL

ashrae.org

J U N E 2020

pretreatment, and heat-recovery chillers. Each
improved on energy performance, but, ultimately,
the heat-recovery chiller option was identiﬁed as
the most cost-effective strategy to meet the project's
energy-efﬁciency goals, and provided the client with
the desired ﬂexibility/critical systems control, with a
simple payback of 6.2 years. The mechanical systems
make up almost all of the energy reduction, as the
savings associated with the LED lighting system and
high-performance lighting control system savings
were dampened by the climate control system. The
results of the analysis and systems utilized resulted

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ASHRAE Journal - June 2020

Table of Contents for the Digital Edition of ASHRAE Journal - June 2020

Contents
ASHRAE Journal - June 2020 - Intro
ASHRAE Journal - June 2020 - Cover1
ASHRAE Journal - June 2020 - Cover2
ASHRAE Journal - June 2020 - 1
ASHRAE Journal - June 2020 - Contents
ASHRAE Journal - June 2020 - 3
ASHRAE Journal - June 2020 - 4
ASHRAE Journal - June 2020 - 5
ASHRAE Journal - June 2020 - 6
ASHRAE Journal - June 2020 - 7
ASHRAE Journal - June 2020 - 8
ASHRAE Journal - June 2020 - 9
ASHRAE Journal - June 2020 - 10
ASHRAE Journal - June 2020 - 11
ASHRAE Journal - June 2020 - 12
ASHRAE Journal - June 2020 - 13
ASHRAE Journal - June 2020 - 14
ASHRAE Journal - June 2020 - 15
ASHRAE Journal - June 2020 - 16
ASHRAE Journal - June 2020 - 17
ASHRAE Journal - June 2020 - 18
ASHRAE Journal - June 2020 - 19
ASHRAE Journal - June 2020 - 20
ASHRAE Journal - June 2020 - 21
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ASHRAE Journal - June 2020 - 23
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ASHRAE Journal - June 2020 - 27
ASHRAE Journal - June 2020 - 28
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ASHRAE Journal - June 2020 - 37
ASHRAE Journal - June 2020 - 38
ASHRAE Journal - June 2020 - 39
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ASHRAE Journal - June 2020 - 49
ASHRAE Journal - June 2020 - 50
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ASHRAE Journal - June 2020 - Cover3
ASHRAE Journal - June 2020 - Cover4
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