[TRNSYS-users] QTSABS vs QSOLTR

[Karol Bandurski]

Dear Marion,

 

So, if I understand, in my case (lack of internal shading), QSOLTR should be
bigger than QTSABS because it includes also QTSOUT and radiation that is
absorbed by windows but then transferred by convection to outside:

 

QSOLTR=QTSABS+QTSOUT+radiation absorbed by windows and then transferred by
convection to outside.

 

If I am right:

1)      Way QSOLTR < QTSABS in my case?

2)      Solar gain is QTSABS because it represents solar radiation that is
captured inside zone while QSOLTR include also QSTOUT and radiation absorbed
by windows and then transferred by convection to outside.

 

I would be grateful for more clarification!

 

Kind regards,
Karol

 

 

From: hotline [mailto:hotline at Transsolar.com] 
Sent: Thursday, November 29, 2018 2:30 PM
To: Karol Bandurski; 'TRNSYS users mailing list at OneBuilding.org'
Subject: AW: [TRNSYS-users] QTSABS vs QSOLTR

 

Dear Karol,

 

I have to confess that this is a little confusing.

For better understanding of the differences of QSOLTR and QTSABS it is
important to understand the considered "parts".

 

QSOLTR is the total shortwave solar radiation transmitted through all
external windows including shading device into the airnode.

Then in the airnode this radiation is distributed to surfaces (taking into
reflection). (For simplicity reasons we assume that there are no adjacent
windows). 

 

As a results QSOLTR is either  

a) immediately transferred as convective heat gain to the internal air (=
Qsolair, doesn't exist in Trnsys 17) or is

b) absorbed by walls or

b) is absorbed by windows (panes, frame and internal shading devices) as
radiation leaves (!) the airnode to the outside or

c) is transmitted to the outside (= QTSOUT, NType 73)

 

QTSABS (NType 75) consists of 

a.	solar radiation is absorbed by walls and
b.	the secondary heat flux of windows (panes, frame and internal
shading devices) ( = QSEC, NType 56).
In this case the secondary heat flux is the part of solar radiation that is
absorbed by windows when solar radiation is entering and leaving the airnode

and going inside to the airnode.

 

Thus, QSOLTR and QTSABS consider different parts of the solar radiation.

I assume you are looking something like QSOLTR - QTSOUT.

 

I hope this explanation helps.

 

Kind regards,

 

Marion

 

 

Von: Karol Bandurski <karol.bandurski at put.poznan.pl> 
Gesendet: Freitag, 23. November 2018 09:39
An: hotline <hotline at Transsolar.com>; 'TRNSYS users mailing list at
OneBuilding.org' <trnsys-users at lists.onebuilding.org>
Betreff: RE: [TRNSYS-users] QTSABS vs QSOLTR

 

Dear Christoph,

 

Thank you for your response!

 

The problem is that, it seems to me, that I don't have internal shading, so
QSOLTR should equal QTSABS. Am I right?

 

How should I set window type and external devices to get QSOLTR=QTSABS?

 

Kind regards,
Karol

 

From: hotline [ <mailto:hotline at Transsolar.com>
mailto:hotline at Transsolar.com] 
Sent: Thursday, November 22, 2018 4:57 PM
To: TRNSYS users mailing list at OneBuilding.org
Subject: Re: [TRNSYS-users] QTSABS vs QSOLTR

 

Dear Karol,

 

QSOLTR is the total shortwave solar radiation transmitted through external
windows and internal shading.

QTSABS also includes the secondary heat flux which includes the convection
of internal shader.

 

Hope that clarifies your energy balance a bit.

 

Best,

Christoph

 

Von: TRNSYS-users < <mailto:trnsys-users-bounces at lists.onebuilding.org>
trnsys-users-bounces at lists.onebuilding.org> Im Auftrag von Karol Bandurski
via TRNSYS-users
Gesendet: Mittwoch, 21. November 2018 16:42
An:  <mailto:trnsys-users at lists.onebuilding.org>
trnsys-users at lists.onebuilding.org
Cc: Karol Bandurski < <mailto:karol.bandurski at put.poznan.pl>
karol.bandurski at put.poznan.pl>
Betreff: [TRNSYS-users] QTSABS vs QSOLTR

 

Dear All,

 

I am going to find whole solar gain which come to zone throug windows.

There are two outputs that I consider: QTSABS and QSOLTR.

 

It seems to me that bigger should be QSOLTR, because it is shortwave
radiation transmitted through window (but not kept 100% in air node).

The QTSABS is what exactly has been kept - has been absorbed by inside
surfaces.

But it is appear that QTSABS > QSOLTR.

 

Could you write me what is right interpretation of those outputs?

 

Kind regards,
Karol

 

--------------------------------------------------------------------

Karol BANDURSKI M. Sc.

Faculty of Civil and Environemntal Engeneering

Division of Heating, Air Conditioning and Air Protection

Poznan University of Technology

 <https://www.researchgate.net/profile/Karol_Bandurski>
https://www.researchgate.net/profile/Karol_Bandurski

 <http://www.put.poznan.pl/~karol.bandurski>
www.put.poznan.pl/~karol.bandurski

 

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