[Trace-users] Multiple Ground source Heatpump in one alternative

[Sturm, Eric]

Catalina,

This is a complex scenario to model in TRACE 700 and I wanted to shed some light on what is possible and not possible.

The limitations you're finding are related to how system coils are assigned to equipment (plants), and ground heat exchangers.  TRACE 700 can only model a single ground heat exchanger per alternative and system coils (e.g. cooling and heating coils) are assigned to a plant, rather than an individual piece of equipment.  In your scenario, you may have one or two ground loops but you'll only be able to model a single loop in the alternative.  This limitation prevents you from modeling the systems independently.

If you create two ground source heat pump pieces of equipment, you'll still need to assign these to a single plant.  Doing so does not allow you to independently operate each plant based upon system coil load because cooling and heating coils are assigned to plants rather than equipment.  The sequencing options will not help you in this instance.

To model this system, you'll need to make a ground source heat pump system as shown in the User's Manual.  You can make a single cooling plant (water source heat pump equipment type) and modify the energy rate and ground loop information as you desire.  You may wish to use a composite energy rate the best represents all heat pumps on the ground loop(s).

I suspect that the information you received from C.D.S. is correct in that you can model two separate heat pump plants, but you cannot model two separate ground loops in a single file.

Regards,
Eric Sturm
Applications Engineer
Trane Commercial Systems
Ingersoll Rand
3600 Pammel Creek Rd
La Crosse, WI 54601

Office:  +1.608.787.3736
Fax:  +1.608.787.3005
Email:  esturm at trane.com<mailto:esturm at trane.com>
Website:  www.trane.com

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Caballero, Catalina
Sent: Tuesday, November 27, 2012 2:57 PM
To: 'trace-users at lists.onebuilding.org'
Subject: [Trace-users] Multiple Ground source Heatpump in one alternative

Good afternoon,

I'm trying to find out a way to model 2 ground source heat pumps in an alternative. One of these systems serves an exhibition spaces, and the other one serves a mechanical room. When I call CDS some representatives say it's possible, others don't think so, making it more confusing. Anybody has experience with this issue?

Regards,

Catalina Caballero, AIA. Assoc., LEED GA.
Johnson, Avedano, Lopez, Rodriguez & Walewski
Engineering Group, Inc.

2510 NW 97th Avenue, Suite 220, Miami, Florida 33172
Tel. (305) 594-0660 Ext. 217 Fax (305) 594-0907

Visit us online: www.jalrw.com<http://www.jalrw.com/>

[JALRW Logo]

HVAC - Electrical - Plumbing - Fire Protection
Sustainable Development - Commissioning


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