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

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@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@lists.onebuilding.org>
Do:        "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>
DW:        Jeff Thornton <thornton@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@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@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@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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