Re: [TRNSYS-users] Simulation of solar cooling system with solar collectors mounted on external wall

[David Bradley <bradley@tess-inc.com>]

The part of the wall that has the window needs to be defined as an EXTERNAL wall. The part of the wall that has the solar collectors on it is a BOUNDARY wall. As for the solar collectors themselves, there aren't any such models in the standard library. The model to which I was referring is Type563, a building integrated PVT (photovoltaics and thermal) collector. You'll need to review the mathematical description carefully in order to do it correctly but if you set the parameters so that the PV efficiency is 0, the device is simply a thermal building integrated collector that calculates the back-side surface temperature that needs to be passed to the BOUNDARY wall.
Kind regards,
 David


a8304506@graduate.hku.hk wrote:

Hello, David.

Thank you for your reply, but I find two problems.  The first one is that for a
BOUNDARY wall, no window can be added.  The second one is that I can't find any
suitable proformas for the solar collectors which have the input and output
variables as mentioned.  Do you have other suggestions?

Best Regards
LEE, Chun Kwong
Research assistant
Division of Building Science and Technology
City University of Hong Kong


Quoting David Bradley <bradley@tess-inc.com>:

  

Chun Kwong,
If you have solar collectors that are truly integrated with the facade
of your building then you will need to define the building wall on which
the collectors are mounted as a BOUNDARY wall with a user defined
outside surface temperature and you will need to define a Type56 output
for either the inside surface temperature or for the energy transfered
out through the outside surface of that wall (QCOMO); which output you
need depends on your collector model. You then need a collector model
that takes either the energy conducted through its back side or the
inside surface temp of the wall and which calculates the temperature of
the interface between the wall and the collector. I believe that there
are some models like that in the TESS Green Building Library.
Kind regards,
david


a8304506@graduate.hku.hk wrote:
    

Hello, Trnsys users.

I want to simulate a solar cooling system with the solar collectors mounted
      

on
    

the external wall of a building.  I suppose that I add an active layer on
      

the
    

external of the wall with an input equivalent heat transfer coefficient for
      

the
    

solar collectors.  However, I don't konw how I can output that value from
      

the
    

solar collector models (say Type71, Type73).  Can anyone advise how I can
      

make
    

it?  Thank you!

Best Regards
LEE, Chun Kwong
Research assistant
Division of Building Science and Technology
City University of Hong Kong




  
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
P: +1.608.274.2577 
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-- 
***********************************************************************
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

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