[Equest-users] Beginner Question on Fan schedule

[Busman, Michael R]

Reduced outdoor ventilation air would have been my first guess.  I've seen a lot of portable classroom buildings that have a wall-mounted heat pump.  Unless they're on a DDC system, they usually come equipped with either a programmable or just a plain vanilla wall thermostat, that's typically set to Auto (intermittent) instead of Fan On (continuous).  Same thing for regular classrooms with a roof top package unit.  Modeling the two different fan modes can show a significant different in heating consumption

Once the classrooms are up to temperature, there often isn't a lot of heat load as the result of internal lighting and occupant heat gains.  On a similar note, where the fan is set to Auto/intermittent, I often measure CO2 levels over 3000 ppm, where a good target is 750-800 and the ASHRAE max limit is 1000 ppm.  Not the best indoor air quality to promote the learning environment for the kids.

Mike

Michael R. Busman, CEM
Lead Project Engineer II

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of RobertWichert
Sent: Sunday, January 27, 2013 4:30 PM
To: Chris Jones
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Beginner Question on Fan schedule

Thanks Chris!  I'll try to figure it out.  Adding those reports within EnergyPro may be trivial though.

Thanks again.





Robert Wichert P.Eng. LEED AP BD&C

+1 916 966 9060

FAX +1 916 966 9068















===============================================
On 1/27/2013 2:10 PM, Chris Jones wrote:
I don't think the behavior of INTERMITTENT changed from DOE2.1e to DOE2.2.  The DOE2.1e Supplement has the same wording as the DOE2.2 manual.

I would add some hourly reports - supply cfm, OA ratio, heating energy and cooling energy.   Run for both CONTINUOUS and INTERMITTENT.  There may be some differences in the amount of outdoor air that is being introduced.

At 11:20 AM 27/01/2013, RobertWichert wrote:

Thanks for the link to the manuals and such, Chris.

I am also investigating "intermittent" as it affects EnergyPro, which claims to use "DOE-2.1E* v119".

The issue involves using "INTERMITTENT" and how that affects heating energy.  Heating energy drops dramatically when "INTERMITTENT" is invoked.  It drops so far that it does not seem realistic, although no errors or flags result that I can find.

I have found some references to "INTERMITTENT" causing negative CFM:  http://doe2.com/download/DOE-22/Bugfixes-047h.pdf

Question - Do you (or anybody on the list) have any ideas why invoking "INTERMITTENT" in a program that uses DOE-2.1E*V119 would show such effects on heating energy (very, very, very low)?????


Thanks for thinking about this!





Robert Wichert P.Eng. LEED AP BD&C

+1 916 966 9060

FAX +1 916 966 9068















===============================================
On 1/27/2013 7:47 AM, Chris Jones wrote:

Hello Jay,
Do you have the DOE2.2 Reference manuals?  DOE2.2Vol2-Dictionary.pdf explains what the INTERMITTENT keyword means.

See page 361 under INDOOR-FAN-MODE.

The reference manuals are available for download at
http://doe2.com/download/doe-22/

Download the latest edition of each manual and enjoy!


At 05:29 PM 26/01/2013, Jay M wrote:

Hi all,

I tried searching for an answer on archives but unable to find an answer.

I in Schematic Mode I set fan to "intermittent"  meaning HVAC fan is only on when heating/cooling is needed...

1) if I set it a value of "1" fan is on alwayst on
2) Set 0 Fan is "off"

Since it is in intermittent mode, when i set to 0.... there is never any cooling.  what am I doing wrong?  Because if i set fan schedule in Detailed edit mod to 1 the fan is always on and I don't want that.

I want intermittment fan schedule  but it's either 1 or 0 in the fan schedule...


Thanks!
_______________________________________________

>>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca<mailto:cj at enersave.ca>



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Christopher Jones, P.Eng.
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Fax. 416-946-1005
email cj at enersave.ca<mailto:cj at enersave.ca>

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