[TRNSYS-users] trnsys-ees connection

[David Bradley]

Dapeng,
   I am not sure whether your email got answered 
or not so I apologize if this is a repeat reply. 
I don't think the initial value will matter very 
much to your simulation because as soon as the 
simulation starts, the initial value specified 
for each component will be replaced with the 
output values of the component from which they 
are connected. Simply make sure that you choose a 
reasonable enough value that will allow both your 
EES model and Type557 to solve without generating an error.

   As a side note, you might consider placing a 
pipe and pump component between the Type66 model 
and the Type557 model. The pump model will allow 
you to turn ON and OFF the flow between the heat 
pump and the ground field and the pipe model will 
ensure that there is thermal capacitance in the 
piping loop. It may be that your bore field 
(Type557) provides enough thermal capacitance to 
ensure that the loop is numerically stable but it 
is best to add the lrunout pipes as well.

Kind regards,
  David



At 06:43 12/22/2007, LiDapeng wrote:
>dear trnsys users:
>
>   I want to use type66 and type557a to simulate 
> a heat pump cycle, and a simple heat pump cycle 
> including evaporator, compressor, condenser and 
> throttle valve is modeled with EES. The outlet 
> fluid temperature of type557a is as the import 
> parameter(ie. enter water temperature of 
> condenser) of EES, and the export parameter of 
> EES is as the inlet fluid temperature of 
> type557a, so these both form a cycle. But i 
> don't know how to determine this cycle's 
> initial value, such as enter water temperature at time=0.
>
>   Doed anyone help me? Thank you very much!
>
>   Best regards!
>
>Dapeng
>
>
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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
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