[Equest-users] Cogeneration with thermal tracking - anyone?

Osser, Roselin roselin.osser at wspfk.com
Thu Jul 12 08:16:35 PDT 2012

Hi folks,

I thought it might be worth sending this one more time as I know a lot of people in the US were on vacation last week and may have missed this exciting post!


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Osser, Roselin
Sent: Thursday, July 05, 2012 1:16 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Cogeneration with thermal tracking

Hi eQuest users,

Has anyone successfully modeled a cogeneration system in eQuest with a control system preventing the generators from turning on until a certain minimum heating load threshold is reached?

This is my first time using the generators in eQuest.  I am trying to follow "Example 4. Thermal Tracking with Surplus Sale" in the DOE-2 user's manual (available by going to Help, DOE-2 Help, and searching for "Example 4" in eQuest). When I get to the setup for the EQUIP-CTRL, the example indicates that generators can be selected along with boilers when the EQUIP-CTRL is of TYPE = HEATING with the HW loop selected as CIRCULATION-LOOP.  However, only my boilers show up as options in the pull-down menu in the tab "Load Range 1" under "Boiler Name." The generators do not appear as options here unless TYPE = ELECTRICAL is selected. This is not desired because I wish to control the generator operation based on a minimum heating load, not a minimum electrical load.  I am able to set up the rest of the components in Example 4.

I tried editing the input file to manually add the generators to the control system; I was able to run eQuest with this code:

"Generator Control" = EQUIP-CTRL
   TYPE             = HEATING
   CIRCULATION-LOOP = "Hot Water Loop"
   LOADS-THRU-1     = 3.75
   LOADS-THRU-2     = 100
   BOILERS-1        = ( "Boiler 1", "Boiler 2" )
   GENERATORS-2     = ( "Elec Gen 1", "Elec Gen 2" )

After doing more experiments, however, it looks like there might be some additional bugs with the control system algorithm.  For example, if I put in a generator capacity of 1000kW, hourly outputs show that slightly less than 100kW is generated.  If I change the capacity to 10,000 kW, slightly less than 1,000 is generated.  Additionally, the generator doesn’t seem to respond to the  “LOADS-THRU” keyword; it comes on even if the LOADS-THRU-1 value is never reached.

In addition to these issues I’m not sure if I correctly understand how to use the GENERATOR-SEQ keywords used in Example 4; I couldn’t find a good explanation in the help file.  No luck with these issues on the BLDG-SIM list either.

If anyone has any tips or knowledge that these options in eQuest are not currently operational, I would be happy to hear from you.

Thank you,


Roselin Osser, PE, BEMP, LEED AP BD+C
88 Black Falcon Ave
Boston, MA
Direct: 617-210-1730 | Main: 617-210-1600

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