[BLDG-SIM] GSHP and radiant panel/baseboard questions

["Jeff Hirsch" <Jeff.Hirsch@xxxxxxxx>]

First, make sure you are up-to-date by downloading and installing

the latest freeware eQUEST; eQUEST version 3.52 was released

last week.  This version was also submitted to the California Energy

Commission for Certification as a non-residential Title 24 Alternate

Calculation Method (ACM)   The eQUEST information page is at

       http://DOE2.com/eQUEST/

 

You can try using a well-water heat-pump chiller; it can be connected

to a two pipe loop and provide heat to that loop when the loop is

scheduled to be in the heating mode.  You can then use zone

baseboards connected to the two-pipe loop to do heating.

 

JJH

 

PS- Actually, D2comply version 3.52, the DOE-2.2 Title 24 compliance

?engine? within eQUEST, was submitted for certification along with

eQUEST 3.52; eQUEST was submitted as the first D2comply ?derivative"

program for certification as an ACM.  Once eQUEST/D2comply 3.52 is

certified, other applications can use the certified version of D2comply

for compliance analysis and then be submitted for "fast-track" certification

since they will perform compliance analysis with an already certified tool. 

n a way, since eQUEST 3.52 contains D2comply 3.52, will be the first tool

to undergo this ?fast-track? certification (although in parallel with D2comply

3.52.)  Other vendors can build DOE-2 analysis tools based on D2comply

and then go through the same process; they will, however, need to meet

all other requirements for becoming a certified ACM (such as documentation,

upport, etc.)  For more information of DOE-2 (including end-user and/or

developer/distribution licensing) see the information page at

       http://DOE2.com/DOE2/

---
Jeff Hirsch
James J. Hirsch & Associates
Building Performance Analysis Software & Consulting
12185 Presilla Road
Camarillo, CA 93012-9243 USA
phone: (805) 553-9000
fax: (805) 532-2401
email: Jeff.Hirsch@xxxxxxxx
web: http://DOE2.com

 

 

----- Original Message -----

From: Pat Dolan

To: BLDG-SIM@xxxxxxxx

Sent: Monday, October 18, 2004 4:51 PM

Subject: [BLDG-SIM] GSHP and radiant panel/baseboard questions

I am simulating a Ground Source Heat Pump system which will provide tempered water to a radiant slab system using eQUEST v3-5.  I know that I can not use the SYSTEM TYPE HP for a radiant slab, but I am looking for reasonable work around to capture the yearly electric power consumption for this system.  I have tried dozens of different options, but I did not want to give up until I heard from the experts.  The building otherwise has typical air-to-water HP systems for ventilation and cooling (the radiant heating is intended to be disconnected from the ventilation source for comfort since this project is an elementary school) with a ground loop for heat rejection/heat.

 

So far, I have not been able to attach either an FPH system (or baseboards) to the WLHP circulation loop since the WLHP loop is a condenser water loop and the FPH system (and baseboards also) can only be attached to either a hot water loop or 2-pipe loop.  Is there anyway to use or simulate a radiant exchanger on the demand side, if the plan is not to use the air-to water exchanger on the HP?   I believe that baseboards would be an acceptable substitute for a floor panel system if I could only find a way to integrate them with the condenser water circulation loop.   Is there any way to define a HW loop which is connected to the WLHP circulation loop?  I have tried to define a secondary loop, but apparently the loop type WLHP cannot have secondary loops attached. Also, would there be a way to define the length of the WLHP loop to accurately simulate heat loss from the loop? 

 

Otherwise, my guess is I would have to determine the overall heat loss from the radiant loop given its physical properties and expected EWT and account for power used for the HP pump primarily and condenser operation (if at all). That would be easy to do, but I would like to know the effect that the loss would have on the rest of the WLHP circulation loop.  Is there a way to define or schedule (either within the eQUEST model or post-processing) the effect that the radiant heat loss would have on the loop temperature, especially the leaving water temperature (LWT) of the loop?  I could then determine the electric power associated with the pump (and condenser I guess) operating on the radiant system based on occupancy and some approximation of outdoor temperature reset control.  

 

Any suggestions?  I could also switch to Doe2.1E v.+100 if there's a better work around there.

 

Patrick Dolan

Serena Sturm Architects, Ltd.

3351 Commercial Ave.

Northbrook, IL  60062

847-564-0370, ext. 24 voice

847-205-5089, fax

 

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