[Bldg-sim] Modeling Centralized Water-to-Water HPs with Geothermal HPs using EE4

Brian Fountain bfountain at greensim.com
Fri Jun 22 12:42:53 PDT 2012


You could do that.  Given the interaction between the systems through the
OA, I would be inclined to keep them as 1 system.  Put the capacities for
the corridor system at the "system level" of your HP system type and then
the distributed heat pumps go at the zone level.   Set the system level
heating to hot water and the system level cooling to hydronic - this will be
your corridor system.

 

At the plant level, I would use an electric boiler to model the
water-to-water heat pump (which is what EE4 does behind the scene anyways
only it uses a EIR < 1 = 1/COP) - you are forced to set the efficiency to 1.
Outside of EE4, simply divide the electrical heating load by a reasonable
heating seasonal COP.  Central cooling will be a chiller representing the
cooling from your water-to-water heat pump.  

 

I'm not sure if that is clear - it is Friday afternoon after all.

 

BF

 

 

 

From: Ahmed Azhari [mailto:a2_azhari at hotmail.com] 
Sent: Friday, June 22, 2012 3:22 PM
To: Brian Fountain; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Modeling Centralized Water-to-Water HPs with
Geothermal HPs using EE4

 

Hi Brian, 

Thanks for your reply.

 

This is the scenario; two make up air units provide fresh air into
condominium corridors. The heating and cooling coils are fed from
water-to-water heat pumps. In each suite, there is a ground source heat
pump. 

 

If i follow your suggestion, I create a CombinationGSHP plant with MAU
system (perhaps i should choose 2-pipe FCU system) and assign only the zones
with the corridors (since fresh air is dumped into corridors). 

 

The second plant would be Geothermal system with a dummy MAU system and
assign suite zones under that system. I should set the fresh air quantities
to zero in the suites since fresh air has been taken care off in the first
plant? 

 

Do you think this is a good presentation of the system?

 

Regards,

Ahmed 

  _____  

From: bfountain at greensim.com
To: a2_azhari at hotmail.com; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Modeling Centralized Water-to-Water HPs with
Geothermal HPs using EE4
Date: Fri, 22 Jun 2012 14:14:09 -0400

Hi Ahmed,

 

You can define multiple plants in EE4 - what if you created one plant for
your centralized water-to-water heat pumps and a second plant for your
distributed heat pumps?

 

Brian

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Ahmed Azhari
Sent: Friday, June 22, 2012 1:04 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Modeling Centralized Water-to-Water HPs with Geothermal
HPs using EE4

 

I'm using EE4 (Canadian Energy Modeling Software) to model centralized
water-to-water heat pumps system which provides hot/chilled water to make up
air unit heating and cooling coils respectively, there are also distributed
ground source heat pumps in the spaces which are connected to the ground to
extract/reject heat. This combination of systems are not supported in EE4,
does anyone know of a work-around to model such system?

 

I appreciate any input on this ...

 

Thanks,

Ahmed

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