[TRNSYS-users] Geoexchange Field Design

[David Bradley]

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)
> fbetz at aeieng.com <mailto:fbetz at aeieng.com>
> www.aeieng.com <http://www.aeieng.com/>
>  
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>
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