ASHRAE Journal - November 2020 - 44
2020
ASHRAE TECHNOLOGY AWARD CASE STUDIES
FIGURE 1 Simplified preheat coil hydronic heating loop.
BAS
Flow Meter
T
M
T
BAS
T
BAS
NC
M NO
C
VSD
Preheat Coil
Circulation Loop
M
NC NO
M
C
VSD
GHR
GHS
T
BAS
M M
PHC
X
M
BAS
VSD
T
DP
BAS
HE
M
Chiller
VSD
DP
Recovery Heat from Building
Heat-Producing Equipment
(Stage 1 Heat)
Recovery Heat from
Campus Waste Heat
(Stage 2 Heat)
Innovation
44
ASHRAE JOURNAL
ashrae.org
N OVEM BER 2020
AHU-1 Thru
AHU-5 (Typical)
Main Heating from Campus Heating
System, Steam to Glycol Heat
Exchanger (Stage 3 Heat)
PHOTO 1 High bay structural testing lab.
©KENGRAHAMPHOTOGRAPHY.COM
The hydronic heating system is specifically designed
to capture the buildings internal equipment heat gain,
as well as the central power plant's unlimited supply
of low-quality waste heat (90°F-100°F [32°C-38°C])
to preheat building intake air (up to 60,000 cfm
[102,000 m3/h]). As outside air temperature often dips
below -20°F (-29°C) in Fairbanks, Alaska, this low-quality energy source can be fully utilized as an outside air
preheat source.
Waste heat from the building's heat-producing equipment is removed either through the campus chilledwater system or the roof-mounted modular chiller
during the summer. During the heating season, this
waste heat is redirected to provide first-stage preheat
to the AHU preheat coils (essentially acting as dry coolers). Data rooms with recirculating fan-coil units, low/
ultra-low temperature walk-in freezers, cold rooms, and
larger lab testing equipment are all hydronically cooled,
contributing to this first-stage preheat source.
After all available first-stage heat has been used, and
if AHU preheat coil discharge temperature setpoint has
not been reached, central plant waste heat (90°F-100°F
[32°C-38°C]) is added as the second-stage preheat
coil heat source. Preheat coil area and fin spacing are
GHR
GHS
PCR
PCS
VSD
PCS
Free Cooling
Section
PCR
Mechanical
Cooling Section
CC
X
M
optimized to pull as much waste heat as possible from
this "free," essentially unlimited, energy source.
When outside air temperature becomes too extreme,
central plant low-pressure steam (which is converted
to hydronic heat through a shell-and-tube heat
exchanger [50% EG]), is used as the third and final
heating source to meet preheat coil discharge temperature setpoint. This methodology minimizes the use
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ASHRAE Journal - November 2020
Table of Contents for the Digital Edition of ASHRAE Journal - November 2020
Contents
ASHRAE Journal - November 2020 - Intro
ASHRAE Journal - November 2020 - Cover1
ASHRAE Journal - November 2020 - Cover2
ASHRAE Journal - November 2020 - 1
ASHRAE Journal - November 2020 - Contents
ASHRAE Journal - November 2020 - 3
ASHRAE Journal - November 2020 - 4
ASHRAE Journal - November 2020 - 5
ASHRAE Journal - November 2020 - 6
ASHRAE Journal - November 2020 - 7
ASHRAE Journal - November 2020 - 8
ASHRAE Journal - November 2020 - 9
ASHRAE Journal - November 2020 - 10
ASHRAE Journal - November 2020 - 11
ASHRAE Journal - November 2020 - 12
ASHRAE Journal - November 2020 - 13
ASHRAE Journal - November 2020 - 14
ASHRAE Journal - November 2020 - 15
ASHRAE Journal - November 2020 - 16
ASHRAE Journal - November 2020 - 17
ASHRAE Journal - November 2020 - 18
ASHRAE Journal - November 2020 - 19
ASHRAE Journal - November 2020 - 20
ASHRAE Journal - November 2020 - 21
ASHRAE Journal - November 2020 - 22
ASHRAE Journal - November 2020 - 23
ASHRAE Journal - November 2020 - 24
ASHRAE Journal - November 2020 - 25
ASHRAE Journal - November 2020 - 26
ASHRAE Journal - November 2020 - 27
ASHRAE Journal - November 2020 - 28
ASHRAE Journal - November 2020 - 29
ASHRAE Journal - November 2020 - 30
ASHRAE Journal - November 2020 - 31
ASHRAE Journal - November 2020 - 32
ASHRAE Journal - November 2020 - 33
ASHRAE Journal - November 2020 - 34
ASHRAE Journal - November 2020 - 35
ASHRAE Journal - November 2020 - 36
ASHRAE Journal - November 2020 - 37
ASHRAE Journal - November 2020 - 38
ASHRAE Journal - November 2020 - 39
ASHRAE Journal - November 2020 - 40
ASHRAE Journal - November 2020 - 41
ASHRAE Journal - November 2020 - 42
ASHRAE Journal - November 2020 - 43
ASHRAE Journal - November 2020 - 44
ASHRAE Journal - November 2020 - 45
ASHRAE Journal - November 2020 - 46
ASHRAE Journal - November 2020 - 47
ASHRAE Journal - November 2020 - 48
ASHRAE Journal - November 2020 - 49
ASHRAE Journal - November 2020 - 50
ASHRAE Journal - November 2020 - 51
ASHRAE Journal - November 2020 - 52
ASHRAE Journal - November 2020 - 53
ASHRAE Journal - November 2020 - 54
ASHRAE Journal - November 2020 - 55
ASHRAE Journal - November 2020 - 56
ASHRAE Journal - November 2020 - 57
ASHRAE Journal - November 2020 - 58
ASHRAE Journal - November 2020 - 59
ASHRAE Journal - November 2020 - 60
ASHRAE Journal - November 2020 - 61
ASHRAE Journal - November 2020 - 62
ASHRAE Journal - November 2020 - 63
ASHRAE Journal - November 2020 - 64
ASHRAE Journal - November 2020 - 65
ASHRAE Journal - November 2020 - 66
ASHRAE Journal - November 2020 - 67
ASHRAE Journal - November 2020 - 68
ASHRAE Journal - November 2020 - 69
ASHRAE Journal - November 2020 - 70
ASHRAE Journal - November 2020 - 71
ASHRAE Journal - November 2020 - 72
ASHRAE Journal - November 2020 - 73
ASHRAE Journal - November 2020 - 74
ASHRAE Journal - November 2020 - 75
ASHRAE Journal - November 2020 - 76
ASHRAE Journal - November 2020 - 77
ASHRAE Journal - November 2020 - 78
ASHRAE Journal - November 2020 - 79
ASHRAE Journal - November 2020 - 80
ASHRAE Journal - November 2020 - Cover3
ASHRAE Journal - November 2020 - Cover4
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