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

[David Bradley]

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 at 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 at 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 at 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 
>> F: +1.608.278.1475
>> E-mail: bradley at tess-inc.com 
>> Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com
>>
>> ***********************************************************************
>>
>>
>>     
>
>
>
>
>
>
>
>   

-- 
***********************************************************************
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 at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

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

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