Re: [TRNSYS-users] TRNSYS-users Digest, Vol 182, Issue 22

On Fri, Feb 14, 2020 at 12:56 AM <trnsys-users-request@lists.onebuilding.org> wrote:

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Today's Topics:

1. Re: direct and diffuse solar radiation through glazing
(Marion Hiller)
2. Radiators with type 56 (mohamed sarmouk)

---------- Forwarded message ----------
From: Marion Hiller <Hiller@transsolar.com>
To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>
Cc:
Bcc:
Date: Thu, 13 Feb 2020 10:01:05 +0000
Subject: Re: [TRNSYS-users] direct and diffuse solar radiation through glazing

Dear Wirich Freppel,

I wonder if this question is still open.

For an external window the incident total radiation has definitely to be less than the transmitted one and I’m sure that this is the case.

According to the results, at day time, so when there is solar radiation, Total tilted surface is below the others.

At which output are you looking for “Total tilted surface” ? Note: The comparison “Total tilted surface” to “QSOLTR” makes sense if the zone has on external window only!!! (QSOLTR is for all windows of a zone!)

If you have one window only you even can calculate back from QSOLTR the split between direct and diffuse radiation by an equation because the solar diffuse transmittance is time independent. This solar diffuse transmittance is given by the glazing definition.

I have the feeling that an output QSOLTR as a surface output might be helpful in the futur.

Kind regards,

Marion

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

Dipl.-Ing. Marion Hiller
TRANSSOLAR Energietechnik GmbH
Stuttgart - Munich - New York - Paris

t: +49.711.67976.0 f: +49.711.67976.11

www.transsolar.com/

KlimaEngineering - Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden
Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart

Amtsgericht Stuttgart - HRB 23347 / Steuernummer: 99073/00911 / USt-IdNr.: DE 152272639
Geschäftsführer: Matthias Schuler, Thomas Auer, Stefan Holst, Dieter Schnelle

Von: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> Im Auftrag von Freppel, Wirich via TRNSYS-users
Gesendet: Freitag, 7. Februar 2020 10:09
An: TRNSYS USERS (trnsys-users@lists.onebuilding.org) <trnsys-users@lists.onebuilding.org>
Cc: Freppel, Wirich <Wirich.Freppel@saint-gobain.com>
Betreff: [TRNSYS-users] direct and diffuse solar radiation through glazing

Dear TRNsys users,

I apologize in advance as this subject was already discussed one year ago, but I think some more explanation could help me to go further in my study. (http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2018-November/030610.html)

I’m trying to calculate the Effective Radiant Field of an occupant, based on TRNsys outputs. To complete the calculation, I need the total diffuse solar radiation entering the airnode through glazing, as well as the total direct radiation. Not being sure of what output I should choose, I compared :

Total tilted surface radiation (which I assumed to be the total direct and diffuse solar radiation arriving on the window)

QSOLTR (which I assumed to be the total shortwave solar radiation transmitted through the window to the airnode)

QTABSI (which I assumed to be the total radiation transmitted to the airnode)

QTSGL (which I assumed to be the total solar radiation passing from outside surface of the window to the airnode)

According to the results, at day time, so when there is solar radiation, Total tilted surface is below the others. So it means, according to what I see, that solar radiation is bigger after going through the window. After those results, it’s difficult to say I understood well what I am doing…

Could you help me to understand those outputs and advise me on the output to choose for “total diffuse solar radiation entering the airnode” and “total direct solar radiation entering the airnode”?

Marion mentioned to use “QSOLTR-QTSOUT”. That would be ok for me, but why is QSOLTR bigger than total tilted surface radiation?

Again, I’m really sorry for digging out that topic again but I do think my interpretation is very bad at the moment.

Thank you in advance for your help.

Wirich FREPPEL
Development engineer, PhD

COSMOS - Buildings Energy Performance & Daylighting Group

Cell: +33 637 053 174

Saint-Gobain Research Compiègne

---------- Forwarded message ----------
From: mohamed sarmouk <sarmouk@gmail.com>
To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>
Cc:
Bcc:
Date: Thu, 13 Feb 2020 15:01:12 +0100
Subject: [TRNSYS-users] Radiators with type 56

Hello,

I want to use radiators to heat my building, i already designed the thermal zones on sketchup Trnsys 3d, then in simulation studio, i did not know how to link radiators to the type 56 building.

Would you please informe me how to do that,

Thank you.

M.SARMOUK

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