ASHRAE Journal - May 2014 - 86

2014 ASHRAE TEcHnology AwARd cASE STudiES

HVAC Energy Use (kWh in Thousands)

relative to the corridors for contamiTable 1 2012 actual energy consumption and 2013 actual energy consumption with 12 month total.
nant control.
2012
Category
The control system uses anticipa(Submetered)
Aug.
Sept.
Oct.
Nov.
Dec.
tory predictive algorithms for the
LightS (kWh)
6,033
6,841
7,732
7,180
6,691
geothermal heat exchanger (GHX)
reCeptaCLeS (kWh)
2,096
1,487
2,933
3,107
2,451
seasonal and daily preconditioning.
hVaC (kWh)
49,796
51,979
50,666
50,934
50,988
This can minimize heat rejection
totaL kWh
57,925
61,307
61,331
61,221
60,130
and compressor energy use as com2013
Category
12 Month
pared to traditional "real-time" con(Submetered)
Total
Jan.
Feb.
Mar.
Apr.
May
June
July
trol that would initiate closed-circuit
LightS (kWh)
7,411
7,482
7,516
7,369
4,837
4,209
5,903
79,204
cooling tower (CCCT) operation
reCeptaCLeS
3,098
3,013
3,337
2,999
2,501
2,522
3,783
34,326
when the GHX temperature simply
(kWh)
exceeds a setpoint. This means that
hVaC (kWh) 59,852
51,756
58,504
59,215
59,266
52,446
79,184
674,585
the CCCT may operate during the
totaL kWh 70,361
62,251
69,356
69,582
66,604
59,177
88,870
788,114
night or during winter to precondition the GHX for summer cooling
Figure 3 HVAC electrical use; Standard 90.1-2007 energy model vs. design energy model vs. actual.
and to minimize summer daytime CCCT
operation. Significant reductions in CCCT
160
energy use and water use can be achieved by
140
operating in winter instead of summer due
120
to lower ambient temperatures.
100
The control system measures and "learns"
80
the actual building thermal load imposed
60
on the GHX and adjusts the preconditioning algorithms in relation to this intelligent
40
model.
20
The cooling (chilled water) system energy
0
Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May Jun. Jul.
efficiency ratio (EER or Btus transferred
per watt of energy consumed) when using
Base Standard 90.1 Building
As-Designed Estimate
Actual Energy Consumption
GHX water directly for sensible cooling can
approach 150 to 200 EER of pumping energy
versus a typical chiller EER of 15 to 20. The GHX predicmodel well, with the overall actual energy consumption
tive control system also allows for an annual reset of the
being 7% less or a total of 57% than the adjusted energy
GHX mean earth temperature to prevent temperature
model. Current site energy use intensity (EUI) is 64
"creep" in this cooling-dominant application.
kBtu/ft2 (202 kWh/m2); quite low for a science building
with many fume hoods.
Submetered electrical use by HVAC system, lightThe application of thermally massive radiant cooling
ing and receptacle loads allows the university to track
energy consumption and know specifically where all the and heating increases the thermal comfort by addressing the mean radiant temperature of the space directly
energy is going.
through a reset of the radiant surface temperature. To
Design phase energy modeling indicated an approxidate, no thermal comfort-related complaints have been
mately 50% reduction in energy cost from a baseline
relayed to the engineer. The control system looks at
Standard 90.1-2007 building modeled per Appendix
conditions from the previous day in addition to the curG. Following system commissioning, the energy model
rent conditions, then predicts when a peak cooling load
was modified to reflect the actual fan and pump heads
might occur and then preconditions the radiant cooling
as well as current temperature setpoints and occupancy schedules. Since the building has come on-line in slab in anticipation of the cooling event. This allows the
floor slab to absorb some of the peak cooling load and
August 2012, the energy consumption has tracked this
86

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ASHRAE Journal - May 2014

Table of Contents for the Digital Edition of ASHRAE Journal - May 2014

Contents
ASHRAE Journal - May 2014 - BB1
ASHRAE Journal - May 2014 - BB2
ASHRAE Journal - May 2014 - Cover1
ASHRAE Journal - May 2014 - Cover2
ASHRAE Journal - May 2014 - 1
ASHRAE Journal - May 2014 - 2
ASHRAE Journal - May 2014 - Contents
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ASHRAE Journal - May 2014 - Cover3
ASHRAE Journal - May 2014 - Cover4
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