[Equest-users] Bug with Secondary Loops?

[Ömer Moltay]

Dear James,

Just tried it both ways, yes we do get the same error with both 2-way as 
well 2-way valves.

Please note that while we have something like 40 chilled beam systems, 
we only get this error for secondary loops connected to a certain group 
of these chilled beam systems.

Thank you,


On 1/6/2015 3:37 PM, James Hansen wrote:
> Do you get the same error regardless of whether you do a 2-way or 3-way blending from the primary to secondary loop?
>
> GHT Limited
> James Hansen, PE, LEED AP, BEMP
> Senior Associate
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>
> -----Original Message-----
> From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ömer Moltay
> Sent: Tuesday, January 06, 2015 5:24 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Bug with Secondary Loops?
>
> Dear All,
>
> We have created a fairly complex model of a building with chilled beams.
> When we connect the chilled beams to secondary CHW loops, we get the following error:
>
> Loop: secondaryCHW_CB40                has a coil curve generating
>                a negative capacity ratio.  Check the loop supply
>                temperature,   71.F, for consistency with the coil curves
>
> OR
>
> Loop: secondaryCHW_CB41                has a coil curve generating
>                a negative capacity ratio.  Check the loop supply
>                temperature,  181.F, for consistency with the coil curves
>
> Two observations:
> (1) The CHW loops obviously have lower supply setpoints, 60F in this case.
> (2) When we connect the chilled beams to the primary loop, then this error disappeares.
>
> I would appreciate some feedback on what could be causing this.
>
> Best regards,
>
> Ömer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP, BREEAM Assessor Mimta EcoYapi Hekimsuyu Cad. 559. Sk. No:39 34255 Kucukkoy Istanbul Turkey
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