[BLDG-SIM] Greenhouse Curtain Simulation

[Graham & Megan]

Assuming your greenhosue is glazed then you could model this (simplisticly) by adding an internal blind on a time / annual schedule (Equest) that modifies the conductive layer below the glass.  This will give you an indication in the energy savings.

In reality you will have a lot of stratification and a CFD model that accounts for radiant heat transfer would provide the best indication of the change in convective and radiant dynamics ...

Regards,
Graham
  ----- Original Message ----- 
  From: Kirchhoff, Eric 
  To: BLDG-SIM at GARD.COM 
  Sent: Friday, June 16, 2006 1:56 AM
  Subject: [BLDG-SIM] Greenhouse Curtain Simulation


  We are looking at trying to simulate the performance of greenhouses with and without heat curtains.  The concept of the heat curtain is basically to trap the heat inside the greenhouse so that it doesn't radiate back out to the sky at night.  The energy savings will occur by a reduction in the use of heaters to keep the temperature above a preset minimum desired setpoint.



  Someone suggested eQuest may be able to do this, but I recall that there were some solar simulation tools around back when I was in school.  My instinct tells me these are probably better tools for tracking the amount of energy the greenhouse would store throughout a given day then eQuest.  Is this an unfair assumption?  Has anyone performed an eQuest model similar to the one I am describing in eQuest before?



  Thanks,



  Eric Kirchhoff, PE

  EE Engineering Supervisor

  Customer Programs

  Southern California Gas Company

  a Sempra Energy Utility

  555 West Fifth Street, GT28A4, Los Angeles, CA  90013

  tel:  (213) 244-4228   fax: (213) 244-8252




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