[Bldg-sim] EE4: Boiler/Cooling Tower Set Points, and Max Heating COP

[Hayssam Barhoun]

Hi Robert, 
What I heard is the DOE2.1 gets unstable and will crash if you have a high temperature setpoint. EnergyPro and EE4 are both DOE2.1 based. That why this limitation exists. 
Also, I believe that the boiler and the cooling tower (in EE4) are on the same loop, and your boiler set point should be set lower than the cooling tower's.
 
Hayssam Barhoun PEng, LEED AP, PhD, BEMP
Senior Engineer | Mechanical
Arup
2 Bloor Street East, Suite 2400  Toronto  Ontario  M4W 1A8 Canada 
t +1 416 515 0915 x24427  d +1 647 260 3427  
www.arup.com




-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of RobertWichert
Sent: Thursday, April 12, 2012 12:57 PM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] EE4: Boiler/Cooling Tower Set Points, and Max Heating COP

Justin,

Do you have any ideas on how to get around having the cooling tower 
setpoint above the boiler setpoint?  This makes no sense to me with a 
cooling tower cooled condenser  and a boiler heated reheat loop.  They 
aren't even connected!

I agree that the limitation is proper for a heat pump, since you don't 
want the boiler just rejecting heat to the cooling tower, but if the two 
loops are not connected (like a hydronic heating system with a water 
cooled condenser DX system) the limitation doesn't make sense.


Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068


===============================================


On 4/12/2012 12:32 PM, Krauel, Danielle wrote:
> Justin,
>
> You can modify the HEATING-EIR (reciprocal of COP) in the DOE code for all zones to achieve the high COP's of a hybrid heat pump (so that you aren't using electricity (compressors) energy for heating).
>
> Kind regards,
> Danielle Krauel P.Eng., LEED AP
> Halsall Associates
> Tel: 613.907.7540 . Toll Free: 1.877.442.5725 x 286 . www.halsall.com
> Vancouver . Calgary . Sudbury  . Burlington . Toronto . Ottawa . Dubai
> Best Workplaces in Canada, Five Consecutive Years: 2007 - 2011
> __________________________
> A Parsons Brinckerhoff Company
>
>
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of bfountain at greensim.com
> Sent: April 12, 2012 3:22 PM
> To: Justin Elkin; bldg-sim-bounces at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] EE4: Boiler/Cooling Tower Set Points, and Max Heating COP
>
> 2) Yup - 8 is as high as you can go.
>
> 1) The boiler setpoint (for a heat pump condenser loop) must be lower than the cooling tower setpoint which is set on the cooling tower tab.
> Brian Fountain
> bfountain at greensim.com

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