[Equest-users] Hourly space temperatura after cooling

Wed Apr 3 07:48:00 PDT 2019

Hi Paul,

If you want to drill down into better understanding the temperature behavior for a given zone, try the following framework:

  1.  Set up a custom hourly report & block for a zone of concern, and track at minimum the "Current hour zone temp (deg F)" and "Current hour zone thermostat setting (deg F).  There are many other helpful options for zones, spaces, systems, and weather data as well to consider for troubleshooting, but we're going to first just focus on observing the temperatures to see where that leads us next:

[cid:image003.png at 01D4E9FE.EB3C4E70]

  1.  Then simulate, File --> Export --> Hourly Results (CSV)
  2.  Presuming you're now in Excel, Highlight the column off to the right of the spreadsheet, and generate a line chart (F11 will automate a few steps) - you'll end up with 8,760 temperature reads in sequence:
[cid:image004.png at 01D4EA00.03D61B90]

  1.  This is a compressed view with dense data, but at this juncture you may pick up an immediate sense of the frequency, magnitude, and seasonal timing of your unmet hours, based on your *understanding* of the thermostat inputs (be mindful human input error is an ever-present possibility for your diagnosis). If nothing seems obvious, you may want to further overlay the hourly thermostat setpoints we exported next (this involved right clicking the chart to add a new series, making it a scatterplot, and adjusting the y-axis bounds:

[cid:image005.png at 01D4EA01.9FECF340]

Recall than "An unmet hour is reported when a zone's hourly temperature diverges from the thermostat setpoint/setback temperature by at least the throttling range + 1°F."

Then based on your observations, you can return to your custom hourly reports to pick up any number of other useful data columns.  Commonly useful things to consider include hourly:

  *   system operations (fan state, active heating/cooling/economizer, airflow, etc).
  *   airflow to the zone
  *   space loads
  *   weather drybulb

It's kind of like you're a doctor diagnosing a patient.  At some juncture you'll hopefully arrive at an "ah-ha" moment and be able to conjecture what specific behavior is the source of your troubles, then go take action in your model to resolve the problem.  The same framework/skillset can be leveraged to visualize and verify the intended results after applying one or more fixes to your model.

Hope this helps!
~Nick

[cid:image001.png at 01D4E9FE.84109030]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Energy Performance Contracting

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913 . 564 . 6361
785 . 410 . 3317
913 . 564 . 6380
nicholas.caton at se.com<mailto:nicholas.caton at se.com>

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Integral Mechanical Engineering Designs via Equest-users
Sent: Tuesday, April 02, 2019 5:37 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Hourly space temperatura after cooling

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Hi all,

If I open the BEPS Building Energy Performance, there are 155 unmet hours. I would like to get the temperatura values throughout the year after cooling, but the only related option that I can see is the SS-O Space Temperature Summary where the temperatures above the set point are much more than the unmet hours. It seems that is the report of the space before cooling.

How could I get the space temperature after cooling to have relation with the unmet hours?

Kind Regards,
Paul Caicedo
IntegralMECH

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