[Equest-users] Modeling an Existing Building - Calibrating to Utility Bills
Michael Campbell
mike at sustainablesolutionscorporation.com
Wed Jul 9 10:04:13 PDT 2014
I’ve made some changes to the model, so the updated model is attached.
Also, below are the consumption tables for electric, steam, and chilled
water. The electric usage will not be accurate because I have not
accounted for plug loads yet, I’ve just used some arbitrary values.
*Start Date*
*End Date*
*Actual Electric Use (kWh)*
1/1/2013
1/31/2013
798,339
2/1/2013
2/28/2013
732,154
3/1/2013
3/31/2013
788,630
4/1/2013
4/30/2013
779,291
5/1/2013
5/31/2013
797,537
6/1/2013
6/30/2013
807,812
7/1/2013
7/31/2013
804,808
8/1/2013
8/31/2013
827,355
9/1/2013
9/30/2013
801,354
10/1/2013
10/31/2013
806,670
11/1/2013
11/30/2013
729,731
12/1/2013
12/31/2013
725,604
*Start Date*
*End Date*
*Actual Steam (klb)*
*Modeled Steam (klb)*
1/1/2013
1/31/2013
7,526
9,371
2/1/2013
2/28/2013
7,861
7,995
3/1/2013
3/31/2013
6,897
7,725
4/1/2013
4/30/2013
3,757
6,167
5/1/2013
5/31/2013
1,534
4,787
6/1/2013
6/30/2013
127
4,042
7/1/2013
7/31/2013
1,800
3,926
8/1/2013
8/31/2013
258
3,863
9/1/2013
9/30/2013
197
4,126
10/1/2013
10/31/2013
1,364
5,277
11/1/2013
11/30/2013
5,622
6,224
12/1/2013
12/31/2013
7,503
8,630
*Start Date*
*End Date*
*Actual Chilled Water (KTH)*
*Modeled Chilled Water (KTH)*
1/1/2013
1/31/2013
55.8
55.9
2/1/2013
2/28/2013
62.4
52.3
3/1/2013
3/31/2013
63.3
76.7
4/1/2013
4/30/2013
140.5
130.3
5/1/2013
5/31/2013
395.5
366.4
6/1/2013
6/30/2013
721.3
521.1
7/1/2013
7/31/2013
1,277.7
729.3
8/1/2013
8/31/2013
850.5
715.7
9/1/2013
9/30/2013
448.6
389.3
10/1/2013
10/31/2013
266.4
217.7
11/1/2013
11/30/2013
65.4
136.3
12/1/2013
12/31/2013
52.5
61.6
*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047
Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*
*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
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*From:* David Eldridge [mailto:DEldridge at grummanbutkus.com]
*Sent:* Wednesday, July 09, 2014 12:07 PM
*To:* Michael Campbell
*Cc:* equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Modeling an Existing Building - Calibrating
toUtility Bills
Mike, the below comments assume that you have electricity and steam matched
up fairly well. Otherwise you should present all of the discrepancies
together as these may provide clues to each other.
1) What are your calibration metrics now, and what are the targets?
2) When you look at the actual building there should be large lab AHUs that
will have cool enough air from OA to meet most cooling loads in the winter.
Are there any FCU or other single-zone cooling sources that might be
causing the cooling use in the model?
If not, can you run an hourly report showing the AHU cooling demand to
verify that these are the source?
3) Verify the range of the client's CHW meters. You may be calibrating to
data that has reduced accuracy at low flows.
DSE Mobile
On Jul 9, 2014, at 10:20 AM, "Kathryn Kerns" <kathryn.kerns at bceengineers.com>
wrote:
Michael, I suggest you take the written sequence of operation with a grain
of salt. Many years of experience has proved that just because a sequence
is written down, doesn’t mean the actual controls follow it. Chilled water
operation trend logs such as, supply and return loop temperatures, pump
status/speed, etc. would be very helpful diagnosing your problem. It is
possible that there is an OSA temperature cut off where the chilled water
system stops running completely or stops running to a non-critical area
that does not show up in the written sequence. Another problem could be
that the 100% OSA heat exchanger doesn’t work the same in the winter as it
does in the summer. Sometimes, if you are use VAV cooling control, raising
the upper temperature limit from 65 F to 70 F on the WARMEST control will
lower winter cooling consumption. Then there is the variable infiltration
rate due to changing OSA temperature problem. In the end, you may just have
to fake something to get the cooling consumption to match. There are just
too many unknown variables. One of the reasons I avoid the LEED measurement
verification credit.
------------------------------
*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
<equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Michael
Campbell
*Sent:* Wednesday, July 09, 2014 7:41 AM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Modeling an Existing Building - Calibrating
toUtility Bills
Hi,
I’m having some trouble calibrating my model to match the utility bills.
The issue I am trying to resolve right now is with the cooling energy.
Below is a table showing the metered chilled water usage for 2013. As you
can see, the usage is minimal in the winter months and much higher in the
summer months. This is a 100% OA laboratory building with fairly high
interior loads due to lab equipment. It is a VAV system with district
chilled water cooling and district steam preheat, and hot water reheat
coils in the VAV boxes. The problem I am having is that my modeled
chilled water usage is much higher in the winter than expected. I have
tried just about everything I can think of without great results. I have
attached the sequence of operations for the HVAC as well as the modeling
files. If someone can take a look, that would be very helpful.
Thanks,
*Start Date*
*End Date*
*Chilled Water (KTH)*
1/1/2013
1/31/2013
55.8
2/1/2013
2/28/2013
62.4
3/1/2013
3/31/2013
63.3
4/1/2013
4/30/2013
140.5
5/1/2013
5/31/2013
395.5
6/1/2013
6/30/2013
721.3
7/1/2013
7/31/2013
1,277.7
8/1/2013
8/31/2013
850.5
9/1/2013
9/30/2013
448.6
10/1/2013
10/31/2013
266.4
11/1/2013
11/30/2013
65.4
12/1/2013
12/31/2013
52.5
*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047
Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*
*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*
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