Re: [EnergyPlus_Support] Cooling coil connected to radiant cooling slab

[Zhen Tian <tianzhen9@xxxxxxxxx>]

Hi, Mike,
   
  I am sorry I did not explain my plan very clearly.  The chilled water from chillers will first pass through main cooling coil.  After leaving the cooling coil, it will enter radiant slab, which is constant flow with its own circulation pump. The cooling coil will determine the chilled water flow. There should be a bypass pipe.  When chilled water temperature out of cooling coil is lower than the water temperature required by the constant flow low temp radiant system, part of the chilled water out of cooling coil will be bypassed. 
   
  In reality, the chilled water is also connected to the radiant slab.  The water supplied to radiant slab is from three aspects 1) water out of cooling coil, 2) chilled water from chillers, and 3) recirculated water from chilled slab.   When chilled water temperature out of cooling coil is higher than the water temperature required by the constant flow low temp radiant cooling system, the chilled wate from chiller will provide additional low-temperature water and mix with the water from cooling coil.
   
   I think this configuration maybe too complicated to configure in EnergyPlus, so I just  ignore the chilled water flow from chiller directly to the radiant slab cooling.
   
  Thank you very much.
   
  Regards,
   
  Zhen 

"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
          I do not know how this could be done in EnergyPlus. The cooling coil 
controller and the radiant slab controls will both want to set the chilled 
water flow rate. If the coil and slab are in series then which controller will 
set the flow? Perhaps you can explain the connections and control strategy in 
more detail.

Mike

On 21 Nov 2006 at 22:40, Zhen Tian wrote:

> Dear all,
> 
> I am trying to make the radiant slab cooling system connecting to the air
> system main cooling coil in a E+ simulation model. The chilled water will
> pass the cooling coil first and then go to the radiant slab. As both cooling
> coil and radiant slab will be in the cooling demand group, could someone tell
> me how to arrange this configuration in EnergyPlus?
> 
> Thank you very much.
> 
> Regards,
> 
> Zhen
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support 
EnergyPlus-Support@xxxxxxxx



         

 
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