[Equest-users] Modeling an Existing Building - Calibrating to Utility Bills

[Michael Campbell]

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.*

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