[Bldg-sim] DOE 2.1 / EE4 Modeling of a GSHP with Hybrid Hydronic Heat Pumps combination

[Hayssam Elias Barhoun]

Hi all,
The project is an New construction office building with a 30 tons ground 
source heat pump with a back-up boiler and Hybrid Hydronic Heat Pumps at 
zone level (total cooling capacity is 110 tons).

In EE4, when you model the plant as Combination Ground Source Heat 
Pump/Boiler, you can't choose a hydronic heat pump as system. So I 
modeled HHHPs as 4-pipe fan-coils. In heating mode, this will fairly 
represent the operation of the HHHPs (no condenser/compressor work) but 
in cooling mode it doesn't.

  DOE 2.1 converts the GSHP to an equivalent centrifugal chiller and 
electric boiler (with a modified COP). The problem here is that heat 
rejected by the chiller in cooling mode is not shared with the loop and 
cannot be used for space heating. The other issue is the loop 
temperatures. HHHP operate at a lower temperature than standard HPs.

How can you account for heat sharing in this case?

Anyone has a workaround for this situation?
Thanks

Hayssam Barhoun, LEED AP, Ing.
Chargé de projet - Energy
Montreal, Qc (H1S-1N2)
Tel.: (514)257-9389 ext. 271
Fax : (514)257-6090
email: hebarhoun at ges-int.com


On 16/09/2010 3:01 PM, bldg-sim-request at lists.onebuilding.org wrote:
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> Message: 1
> Date: Wed, 15 Sep 2010 15:07:03 -0400
> From: Shariq_Ali at URSCorp.com
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] CFD w/ Ecotect and Winair4 / NIST FDS
> Message-ID:
> 	<OF5B98D9DE.335945C6-ON8525779F.00683CDE-8525779F.0069020C at urscorp.com>
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> Content-Type: text/plain; charset="us-ascii"
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>
> What does the community think of mechanical / energy engineers running
> airflow studies of air movement around and inside buildings using
> Autodesk's Ecotect and Winair4 or NIST FDS? (If an individual can get the
> programs to play together)
> I touched on CFD and FEA in college and remember there is quite a bit to
> it, epically when it comes to assumptions and boundary conditions.
>
> Can a mechanical / energy engineer adequately analyze air movement in and
> around a building with out training in CFD?
> Or do you feel that this is an analysis that is best left for people who do
> CFD simulations regularly?
>
> Keep in mind that Ecotect and Winair4 and NIST FDS are limited in their
> analysis capabilities, so we can limit the scope of this question to only
> analyzing air movement due to wind / pressure in and around a building.
> NIST FDS uses LES, I am not certain what Winair4 uses.
>
> Regards,
> Shariq
>
> Shariq Ali EIT, LEED AP BD+C
> Mechanical Engineer
> URS Corporation
> 1375 Euclid Ave. Suite 600
> Cleveland, OH 44115
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> Message: 2
> Date: Wed, 15 Sep 2010 14:09:48 -0700
> From: Carol Gardner<cmg750 at gmail.com>
> To: Morgan Heater<morgan at ecotope.com>
> Cc: bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] PLR for PRTU furnaces
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> I'd ask your local rep for data or go online and look for Technical
> Specifications for the manufacturer. You can usually find them there.
>
> Carol
>
> On Wed, Sep 15, 2010 at 11:49 AM, Morgan Heater<morgan at ecotope.com>  wrote:
>
>    
>>   Does anyone have a good source for part load performance curves for the
>> heating section of gas pack RTUs?  Thanks.
>>
>>
>>
>> Morgan Heater, PE, LEED AP
>>
>> Ecotope, Inc
>>
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>>
>> (206) 322-3753 x209
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>> 4056 9th Avenue NE
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