[Equest-users] Hourly space temperature after cooling

Bishop, Bill bbishop at pathfinder-ea.com
Tue Mar 26 09:36:43 PDT 2019


The DOE-2 help file for BEPS plant report provides context on unmet hours (similar language for HEATING):
HOURS ANY ZONE ABOVE COOLING THROTTLING RANGE is the percentage of hours when the temperature in any conditioned zone is above the zone thermostat’s cooling throttling range by more than 1°F. This is a measure of the HVAC systems’ ability to hold zone thermostat set points. Note that, in a given hour, it does not matter how many zones are above the cooling throttling range; as long as at least one zone is above the throttling range, the hour is counted. For this reason, the value may or may not match the total shown in report(s) SS-F and SS-R.
Additional background provided by Steve Gates on 21-Jan-2010:

Throttling range is the temperature band between no output and full output,
with the setpoint in the middle of the range.  If the VAV cooling setpoint
is 76F with a throttling range of 2F, then the VAV box is at minimum position
at75F, and at maximum at 77F.

The BEPS and BEPU reports count hours as outside the throttling range if the
zone temperature is more than 1F outside the temperature band.  In the above
example, a zone greater than 78F or less than 74F would be considered out of
control.

~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005
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From: The Energy Simulation Academy <info at simulate.energy>
Sent: Tuesday, March 26, 2019 11:38 AM
To: Integral Mechanical Engineering Designs <integralmech at outlook.com>
Cc: Bishop, Bill <bbishop at pathfinder-ea.com>; David Eldridge <DEldridge at grummanbutkus.com>; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Hourly space temperature after cooling

Good for you! But now my OCD is triggered.

To repeat the question if anyone is just looking at this email:

Does anyone happen to know the computational definition of an unmet hour for eQUEST? Especially as stated:
i.e DOE2 will mark an Unmet hour if a zone is: Outside the throttling range? How many degrees outside range (.1, 1 etc)? Plus Occupied? Plus Coil capacities are exceeded? Plus Any other conditions?

I guess I can dig for it, but it's likely one of you knows this officially,

Bob
Energy-models.com
Simulate.Energy
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On Tue, Mar 26, 2019 at 10:28 AM Integral Mechanical Engineering Designs via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:
Hello,

Thank you for all your answers. There have been really helpful, and the problem was that I had 90 °F in the day schedules within the S1 Sys1 (PSZ) Cool SCH (different value as mentioned by Bill). The solution was to correct the value to 75 °F, and now the unmet hours match with the SS-O report.

Kind Regards,

Paul Caicedo

Mechanical Engineering Consultant



IntegralMECH

________________________________
From: Bishop, Bill <bbishop at pathfinder-ea.com<mailto:bbishop at pathfinder-ea.com>>
Sent: March 25, 2019 7:27 AM
To: Integral Mechanical Engineering Designs; David Eldridge
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: Hourly space temperature after cooling


Hi Paul,

The 75 °F input that you shared below for “Indoor Design Temperature” is the DESIGN-COOL-T which is used for sizing calculations (and is optional when using DOE-2.3). The hourly thermostat setpoint is part of the thermostat schedule so you need to look at the day schedules within the S1 Sys1 (PSZ) Cool Sch.

Regards,

~Bill



William Bishop, PE, BEMP, BEAP, CEM, LEED AP

Senior Energy Engineer



[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005

bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>        www.pathfinder-ea.com<http://www.pathfinder-ea.com/>

134 South Fitzhugh Street

Rochester, NY 14608               [cid:image005.png at 01D4E3D0.0DE63380]         Ask me why Carbon Fee & Dividend may be right for you.



From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Integral Mechanical Engineering Designs via Equest-users
Sent: Saturday, March 23, 2019 2:34 PM
To: David Eldridge <DEldridge at grummanbutkus.com<mailto:DEldridge at grummanbutkus.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Hourly space temperature after cooling



Hi David,



Thanks for the answer. I don´t think that explain the data because the system is working most of the time during the year, and a note in the SS-O report shows that the temperature counts are made only for the hours when the fans are on. The cooling schedule matches with the  occupancy schedule.

[cid:image007.png at 01D4E3D0.0DE63380]

The set point is 75 °F and the throttle range is 2 °R.

[cid:image008.png at 01D4E3D0.0DE63380]

The BEPS report shows that are 155 unmet hours, but the SS-O report gives a value of at least 2505 (adding from 80-85 and above 85).



Kind Regards,

Paul Caicedo

Mechanical Engineering Consultant



IntegralMECH





From: David Eldridge <DEldridge at grummanbutkus.com<mailto:DEldridge at grummanbutkus.com>>
Sent: March 22, 2019 9:29 AM
To: Integral Mechanical Engineering Designs
Subject: RE: Hourly space temperatura after cooling



That SS-O report should be after cooling (it’s a “system” report), but it may include some hours when the control system is in setback – it’s not only for occupied hours, would that explain your data?



There is a separate module for report variables that you can specify to document any number of internal calculations, including one or more space temperatures – it’s been a while since I set one of those up but if you search this community for “report variables” some instructions should pop up.



These can then also be exported to excel, or printed in the *.sim report.



David





David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP

Associate



Direct: (847) 316-9224 | Mobile: (773) 490-5038



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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Integral Mechanical Engineering Designs via Equest-users
Sent: Friday, March 22, 2019 8:51 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Hourly space temperatura after cooling



Hi all,



If I open the BEPS Building Energy Performance, there are 155 unmet hours. I would like to get the temperature 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

Mechanical Engineering Consultant



IntegralMECH
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