[Equest-users] Output of Space cool consumption comes innegative

[Nicholas.Caton at schneider-electric.com]

Hi Nitin,

 

I suspect there are inadvertent changes beyond those you’ve described moving CFM’s around.  Comparing a before/after save file case could prove enlightening if that’s available.

 

I searched the archives a bit – past instances of  “negative cooling” have reportedly involved:

-          Misapplied CHW loop reset scheduling

-          Drastically undersized chiller capacities (review units, try auto-sizing)

-          Drastically undersized heat rejection / towers, in a similar vein

-          Custom chiller curves gone awry

 

Some other observations, beyond the negative cooling:

-          Electric heating is more than doubling

-          Electric fan energies are altogether slightly higher

-          Gas heating is a full magnitude larger

 

From the above I’d suspect one or more edits to inputs on the hydronic side are playing a role…

 

Best regards,

 

~Nick

 

---------------------------------------------------------------------------------------------------------------------------------------------

Nick Caton, P.E.

  Senior Energy Engineer
  Energy and Sustainability Services
  North America Operations
  Schneider Electric

D  913.564.6361 
M  785.410.3317 
E  nicholas.caton at schneider-electric.com <mailto:nicholas.caton at schneider-electric.com> 
F  913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

  <http://www.schneider-electric.com/ww/en/> 

 

 

*Please consider the environment before printing this e-mail

 

 

 

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Javed Iqbal
Sent: Monday, March 28, 2016 11:45 AM
To: Nitin Harjai
Cc: equest-users
Subject: Re: [Equest-users] Output of Space cool consumption comes innegative

 

Would you mind sharing your INP and PD files?

 

On Mon, Mar 28, 2016 at 10:13 PM, Nitin Harjai <nitin.harjai28 at gmail.com> wrote:

Hi...

 

I have a problem regarding the equest output & I need your help so that I can complete the project on time.

 

At the first step to remove the proposed case unmet hours,i have increased the cfm of same zone by diverting the cfm of other zone which is having zero unmet hour, in order to maintain the design CFM of particular system throughout the model.

 

After simulate the model, the unmet hour of same zone has been reduced without affecting the zone from where the CFM was diverted, but the output of space cool consumption comes in negative. I have attached the pics of before & after the simulation of monthly energy consumption graph.

I just want to know that why is this space cool output consumption showing in negative and how to make it correct?

 

For your information, this is the hospital project consist of  ground+7 floors+3 basements and for cooling & heating, there are two water cooled screw chiller, two hot water generator are used on site.

 

 

Regards,

Nitin Harjai

Sustainability Engg.


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-- 

 

 

Javed Iqbal, LEED AP, CEA

Sr. Energy Analyst 

 

 

 

 

 

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