[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TRNSYS-users] Geoexchange Field Design

Fred,
  Type557 has a built-in assumption of a cylindrical bore-field configuration. It might be possible to fake the thermal properties in order to model a single line of bores but I am not sure I'd know how to suggest that you accomplish that. There are a few models out there for borefields that allow you to place the bores wherever you want but I've not used any of them.

  As for the run-outs (between the bore field and the heat exchanger), I'd use the simplified buried pipe that is in the TESS Library (basically Type31 but with an embedded ground temperature model) because its quick. Type556, while a more detailed model of the run-out is slower. Both models account for the thermal capacitance of the fluid in the pipe.
Kind Regards,
 David


Fred Betz wrote:
Is there a way of deciding a specific layout of the bore field using type 557a?
 
I have one vertical u-tube field type that is around the perimeter of a building, essentially all the pipes in a single row.
 
The second is a typical vertical u-tube with the bore holes evenly spaced in an array. However that array is not symmetrical.
 
Also, should I use a type 556 buried horizontal pipe between the bore field and the heat exchanger or a normal type 31 pipe? Is type556 meant to be used as a pipe or as another heat exchange method like type557a? Will the model take into account the volume of the pipe in the calculations so the simulation converges?
 
Thanks,
 
Fred
 
 
 
Fred Betz, PhD., LEED AP
Senior Sustainable Design Consultant
Affiliated Engineers, Inc.
608-236-1175
608-444-4857 (c)
 

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
  

-- 
***********************************************************************
Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley@tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

***********************************************************************