[TRNSYS-users] ODP: Re: [TRNSYS users] Type 997 modification (Horizontal Field Ground Heat Exchanger)

Mon Nov 13 03:15:36 PST 2017

Jeff,

It's great to hear from the creator of the component! I have taken this 
wrong assumption because the mathematical reference says that: "... For 
the sake of simulation speed, the model breaks the ground along two axes 
of symmetry (in the x and y directions) and simulates only one quarter of 
the field, multiplying energy transfer results to arrive at the total 
effect."
What I would like to simulate is something like:

38 pipes of 55m length in the ground buried on average 2.5m (centerline of 
middle row). All pipes are connected at inlets and outlets with 
collectors, and the same mass flow rate is assumed.
The HX is close to the building wall: 1.5m, which is insulated from the 
outside. At the end I want also combine building thermal simulation with 
the 997 type in simulation studio, but I dont' have building geometry yet. 

The shift in the middle row can be neglected if the tool is not capable of 
including that. 
My goal is to simulate 25 years of HX and get outlet temperatures and 
ground temperatures. I read that there's GroundTemperatureViewer tool 
capable to see the .soil file, but it cannot find it yet. 

Best regards,
Jakub Winiarski
R&D Specialist / Energy Simulations 

kom. +48 882 341 596
e-mail: j.winiarski at mostostal.waw.pl
mostostal.waw.pl 
        BUDUJEMY PRZYSZŁOŚĆ.
        Mostostal Warszawa SA, ul. Konstruktorska 12A, 02-673 Warszawa, 
tel.: +48 22 250 70 00, fax: +48 22 250 70 01 
        Sąd Rejonowy dla m. st. Warszawy w Warszawie, XIII Wydział 
Gospodarczy Krajowego Rejestru Sądowego
        Nr KRS 0000008820, NIP: 526-020-49-95, Regon: 012059053 

Jesteśmy jednym z sygnatariuszy Porozumienia dla Bezpieczeństwa w 
Budownictwie – inicjatywy utworzonej w sierpniu 2010 r. przez siedmiu 
największych generalnych wykonawców w naszym kraju. Misją Porozumienia 
jest prowadzenie działań na rzecz podniesienia poziomu kultury 
bezpieczeństwa pracy w branży budowlanej, a celem wyeliminowanie wypadków 
śmiertelnych na polskich budowach. 

Od:     Jeff Thornton via TRNSYS-users 
<trnsys-users at lists.onebuilding.org>
Do:     "TRNSYS users mailing list at OneBuilding.org" 
<trnsys-users at lists.onebuilding.org>
DW:     Jeff Thornton <thornton at tess-inc.com>
Data:   10.11.2017 17:34
Temat:  Re: [TRNSYS-users] [TRNSYS users] Type 997 modification 
(Horizontal Field Ground Heat Exchanger)
Wysłane przez:  "TRNSYS-users" 
<trnsys-users-bounces at lists.onebuilding.org>

Jakub,
As the author of Type997, I can tell you that the model most certainly 
does NOT use 1/4 symmetry.  There's no way to apply the symmetry as the 
fluid changes temperature along the entire length axis and across the 
entire width and depth of the piping array.  That's why Type997 takes both 
the left and right, and both the front and back, parameters (insulation 
extension, far-field boundary etc.).  If it was 1/4 symmetry it would need 
only one of front/back or left/right.  Why don't you send a sketch showing 
what you'd like to model and we can see if 997 is the right model.  We 
have other more generic models that can handle a wider range of 
geometries.

Jeff

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577  Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 11/10/2017 4:15 am, Jakub Winiarski via TRNSYS-users wrote:
Dear Users,

Have anybody tried to modify the Type 997 component: Horizontal Field 
Ground Heat Exchanger, so that the insulation on Near Field surface can be 
set on just one side of HX domain? By deafult in order to reduce 
calculation cost the model is symmetrical in both x and y axis so that 
only quarter of domain is calculated. That is why the user can provide 
insulation on all four bounding surfaces or none. If there is a way to 
'turn off' the symmetry in FORTRAN code and apply the boundary conditions 
on particular bounding surfaces it will be all I need. 
Perhaps someone already have done such modification?

Best regards,
Jakub Winiarski
R&D Specialist / Energy Simulations 

kom. +48 882 341 596
e-mail: j.winiarski at mostostal.waw.pl
mostostal.waw.pl
        BUDUJEMY PRZYSZŁOŚĆ.
       Mostostal Warszawa SA, ul. Konstruktorska 12A, 02-673 Warszawa, 
tel.: +48 22 250 70 00, fax: +48 22 250 70 01 
       Sąd Rejonowy dla m. st. Warszawy w Warszawie, XIII Wydział 
Gospodarczy Krajowego Rejestru Sądowego
       Nr KRS 0000008820, NIP: 526-020-49-95, Regon: 012059053 

Jesteśmy jednym z sygnatariuszy Porozumienia dla Bezpieczeństwa w 
Budownictwie – inicjatywy utworzonej w sierpniu 2010 r. przez siedmiu 
największych generalnych wykonawców w naszym kraju. Misją Porozumienia 
jest prowadzenie działań na rzecz podniesienia poziomu kultury 
bezpieczeństwa pracy w branży budowlanej, a celem wyeliminowanie wypadków 
śmiertelnych na polskich budowach. 

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