[Equest-users] System crash when attempting to add energy recovery

[Fred Betz]

I've had a similar experience with 3.64 when I have a lot of zones assigned to a system, and then adding heating recovery.

If you let the model sit long enough, 5-10 minutes, it should recover and issue a warning about making too many changes. The changes go through, I just don't think it lets you undo them, or something like that.

This does become annoying if you have multiple systems with energy recovery. I would use the approach of copying the ER code in the .inp file and pasting it appropriately to the other AHU's to save time.

I've had the 6F error come up in VAV systems when I have a very high flow rate, and relatively little load. For example, maintaining 20 air changes per hour in a hospital operating room when the schedule has reduced loads while there is no surgery being performed. Also, if you have an elevated chilled water temp, ~58F, this may be the problem.

Hope that helps,

Fred


Fred Betz  PhD., LEED AP
Sustainable Systems Analyst



AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com<mailto:fbetz at aeieng.com>  |  www.aeieng.com<http://www.aeieng.com/>



From: Otto Schwieterman [mailto:oschwieterman at fhai.com]
Sent: Wednesday, September 19, 2012 3:06 PM
To: Maria Ramos; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] System crash when attempting to add energy recovery

I am assuming that you are in the detailed edit mode. I would try to add the energy recovery in the .inp file. If you don't have a different project that you can copy the energy recovery from, create a new project in the wizard and add energy recovery to the HVAC system and copy and paste from that .inp file. Once you copy the energy recovery to the system, you should be able to open eQUEST and make any necessary changes.

 I have had eQUEST lock on me in the past (especially on version 3.64) with no explanation but this process has worked.

From: Maria Ramos [mailto:mramos at innovaengineers.com]
Sent: Wednesday, September 19, 2012 3:33 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] System crash when attempting to add energy recovery

All, I am attempting to add energy recovery (heat pipe) to my system, which is VAV reheat, one system per site.  The file locks up.  Before I attempted to add this, the building was compiling just fine, but I had attempted to run the baseline and it had given me an error that the cooling coil leaving temperature needed to be 6 F higher than entering water temp.  I had tried lowering the entering chw temp, but it still wasn't converging.  So I was attempting to add energy recovery (which the system will have, though I was trying not to add it in the baseline to simulate App G baseline).  The system is high percent outdoor air (0.81).  Does anyone have any ideas as to what might be causing the file to lock when trying to add the ER?  Thanks.

Maria

Maria T. Ramos, PE, CxA, LEED B+DC

Innova Engineering, Inc.

2360 Fairview Ave
Cincinnati, OH  45219
T:  (513) 419-4235
C:  (513) 237-5604

www.innovaengineers.com<http://www.innovaengineers.com/>
mramos at innovaengineers.com<mailto:mramos at innovaengineers.com>


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