ASHRAE Journal - February 2015 - 68
TECHNICAL FEATURE
TABLE 1 Three building annual energy impact.
FIGURE 4 Month-by-month science center gas usage.
BEFORE
PROJECT
2011 - 2012
700
2011 - 2012
2012 - 2013
600
AFTER
PROJECT
2012 - 2013
PERCENT
CHANGE
Gas Use
Gas Used at Science Center, Decatherms
2,803
2,182
Down 22%
500
Gas used at University, Decatherms
37,376
36,641
Down 2%
400
Steam Used at Cordier, lbs/Year
433,696
0
Steam Used at H-K, lbs/Year
883,935
0
300
June
0
May
Up 3%
April
4,689
March
4,546
February
Heating Degree Days/Year
January
100
December
Up 93%
November
164,316
October
85,000
September
0
August
474,100
Area Heated from Science Center, ft2
July
Steam Main Line Loss, lbs/Year
200
Metering was not installed to isolate the impact of these
shared features. The study year also showed many hours
when the heat recovery chiller was running to meet
campus CHW demand, due to outages at the main chillers. Again, there was no metering available to isolate this
impact on Science Center electric usage.
It is a fair observation that, on the campus level, there
may have been a minimal (or no) increase in electric use.
Heating pumps for the Academic Center and Cordier
would have been on as required by those buildings irrespective of their location; and an air-cooled chiller (1.2
kW/ton [0.34 kW/kW], stand-alone approach) would have
been operating all of the hours that the HRC was running
(1.4 kW/ton [0.40 kW/kW] with air-cooled condenser).
Figure 4 shows the month-by-month gas change. The
HRC started in mid-June of 2012, hence the low gas usage
that month. As can be seen, the largest percent reductions
are in the months when the HRC was running to keep the
boilers off. January showed increased gas usage but the
Science Center was now supplying all of the heat for three
buildings.
Conclusion
www.info.hotims.com/54425-30
68
ASHRAE JOURNAL
ashrae.org
FEBRUARY 2015
There were multiple benefits to the synergistic approach:
* Less energy to heat three buildings than it used to
take to heat one;
* Significant operating cost savings on purchased gas;
* Accelerated the Cordier conversion from steam to
low temperature hot water;
* Saved capital cost when including the Cordier conversion;
* Less mechanical space required in the Academic
Center, resulting in more assignable space for academic
functions;
* Availability of chilled water 12 months of the year
for any campus needs; and
* Benefit of a single heating control system rather
than three separate ones.
Two larger conclusions for a campus situation with
shared heating and cooling systems are that the synergistic approach should be evaluated; and a heat recovery
chiller will almost always be a wise investment.
ASHRAE Journal - February 2015
Table of Contents for the Digital Edition of ASHRAE Journal - February 2015
Contents
ASHRAE Journal - February 2015 - Cover1
ASHRAE Journal - February 2015 - Cover2
ASHRAE Journal - February 2015 - 1
ASHRAE Journal - February 2015 - 2
ASHRAE Journal - February 2015 - Contents
ASHRAE Journal - February 2015 - 4
ASHRAE Journal - February 2015 - 5
ASHRAE Journal - February 2015 - 6
ASHRAE Journal - February 2015 - 7
ASHRAE Journal - February 2015 - 8
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ASHRAE Journal - February 2015 - 15
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ASHRAE Journal - February 2015 - 17
ASHRAE Journal - February 2015 - 18
ASHRAE Journal - February 2015 - 19
ASHRAE Journal - February 2015 - 20
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ASHRAE Journal - February 2015 - 22
ASHRAE Journal - February 2015 - 23
ASHRAE Journal - February 2015 - 24
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ASHRAE Journal - February 2015 - 48
ASHRAE Journal - February 2015 - S1
ASHRAE Journal - February 2015 - S2
ASHRAE Journal - February 2015 - S3
ASHRAE Journal - February 2015 - S4
ASHRAE Journal - February 2015 - S5
ASHRAE Journal - February 2015 - S6
ASHRAE Journal - February 2015 - S7
ASHRAE Journal - February 2015 - S8
ASHRAE Journal - February 2015 - S9
ASHRAE Journal - February 2015 - S10
ASHRAE Journal - February 2015 - S11
ASHRAE Journal - February 2015 - S12
ASHRAE Journal - February 2015 - S13
ASHRAE Journal - February 2015 - S14
ASHRAE Journal - February 2015 - S15
ASHRAE Journal - February 2015 - S16
ASHRAE Journal - February 2015 - 49
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ASHRAE Journal - February 2015 - Cover4
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