[Equest-users] Fw: Mitsubishi Curves for eQuest

[Travis Miller]

Thanks Bill, I noticed that by decreasing the OSA I could get the error to go away. Thanks for shedding some additional light on why this error was occurring. Much Appreciated.

Travis

From: Bishop, Bill [mailto:bbishop at pathfinder-ea.com]
Sent: Friday, October 18, 2013 8:49 AM
To: Travis Miller; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Fw: Mitsubishi Curves for eQuest

Travis,

By searching through the SS-H reports, I identified system 3 FC-3.10 (G.C4) as the culprit. This is the only system causing the errors. The "VRF Heating Capacity Curve" curve you are using gives negative values for the multiplier on heating capacity, at 25°F Ewb or lower. The system giving the error has OA ratio of 57%, causing errors in January and December due to low entering air temperatures, as shown in this custom hourly report:

[cid:image003.jpg at 01CECBE2.FE3A3CC0]

(Heating capacity values in the reports are normally negative numbers, not positive.)
There are different things you can do to get rid of the error.

·         Increase heating capacity

·         Decrease OA cfm

·         Outside air MIN-AIR-SCH

·         Increase MIN-HP-T

·         Etc.

Regards,
Bill

William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114            F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>           www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
P   Sustainability - the forest AND the trees. P

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org]<mailto:[mailto:equest-users-bounces at lists.onebuilding.org]> On Behalf Of Travis Miller
Sent: Thursday, October 17, 2013 4:58 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Fw: Mitsubishi Curves for eQuest

Below are a couple of screenshots describing what is happening with the model when I select the VRF Heating Capacity Curve. Has anybody seen something like this happen before? Do the curves not like my weather file which is for Pocatello, ID?

[Description: C:\Users\tmiller\Desktop\VRF 1.PNG]



[Description: C:\Users\tmiller\Desktop\Capture.PNG]


From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Travis Miller
Sent: Thursday, October 10, 2013 4:51 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Fw: Mitsubishi Curves for eQuest

I am looking for some help in troubleshooting a VRF model I created by following the attached Mitsubishi documents.

I followed all of the steps with no problems up to the point of selecting the VRF heating capacity curve. As soon as I selected VRF Heating Capacity Curve under the Cap Curve/Waste Heat tab, the space heating kWh disappears (in addition to a massive negative utility bill for the month of January).

There is an additional twist - I was able to select the VRF Heating Capacity Curve for all basement zones and assign it without the model going bonkers, it just goes off the rails when selecting this curve for any of the above grade zones. I have been combing through the model trying to figure out what is causing this but with no luck so far.

I have attached my project file in the zip file titled Bank as well as the original Mitsubishi info. Thanks again in advance for any help.

Travis

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org]<mailto:[mailto:equest-users-bounces at lists.onebuilding.org]> On Behalf Of Paul Diglio
Sent: Tuesday, November 27, 2012 1:09 PM
To: Gastón Michaud F.; Rodrigo Cerqueira; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Fw: Mitsubishi Curves for eQuest

Gaston & Rodrigo:

Some good information from Mitsubishi attached.

Paul Diglio, CEM, CBCP
87 Fairmont Avenue
New Haven, CT 06513
203-415-0082

www.pdigliollc.com<http://www.pdigliollc.com>


----- Forwarded Message ----<jcefaly at hvac.mea.com<mailto:jcefaly at hvac.mea.com>>
To: paul at 4elementsgroup.com<mailto:paul at 4elementsgroup.com>
Sent: Tue, November 27, 2012 11:33:34 AM
Subject: RE: Mitsubishi Curves
Paul,

I just noticed our earlier dialogue and realized that you are doing energy modeling in eQUEST.  Mitsubishi recently put together the attached application note for guidance in modeling VRF in this software (also attached is a .inp file and a .pd2 file with the heating/cooling partload curves already entered).


Joe Cefaly | Mechanical Engineer - LEED AP
MITSUBISHI ELECTRIC COOLING & HEATING
Direct: 508.281.4122 | Fax: 508.449.3811 | Cell: 508.330.0694
From: paul at 4elementsgroup.com<mailto:paul at 4elementsgroup.com> [mailto:paul at 4elementsgroup.com]<mailto:[mailto:paul at 4elementsgroup.com]>
Sent: Monday, November 26, 2012 8:16 PM
To: Cefaly, Joseph
Subject: RE: Mitsubishi Curves

Joe:

I wonder if you can help me out.  I am looking for the performance data for a PUHY-P1500-YSHM-A.  I want to write the custom curves for this unit.  I guess it is not sold in the USA?  This is a project in another country.

Thank you,

Paul Diglio CEM, CBCP

4 Elements Group
89 Taylor Avenue
Norwalk, CT 06854
Cell 203-415-0082




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