[TRNSYS-users] Incident solar radiation on greenhouse ground

[hotline]

Dear Mario,

if QIDAB = QSIAB, then QSBAB = 0. In this case you are right, all incident radiation is diffuse.
That’s probably because the sum of all GEOSURF in zone is equal to zero. To adjust these parameters please have a look into the manual 5.2.4.2 Input of Walls.

Best,
Christoph

Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> Im Auftrag von Mario González via TRNSYS-users
Gesendet: Dienstag, 24. April 2018 18:49
An: trnsys-users at lists.onebuilding.org
Cc: Mario González <marioglezx at gmail.com>
Betreff: Re: [TRNSYS-users] Incident solar radiation on greenhouse ground

Dear Christoph,

Thanks for the reply, I tried with that output (QSIAB), and also I tried the QIBAB and QIDAB for the same surface (the ground floor), but I get the same value on QIDAB as in QSIAB, meaning that all the incident radiation is diffuse. Am I right? Is there a need to adjust some parameter? I saw something about GEOSURF parameter, but I do not have it clear how to justifiy what number to put there.

The multiplication of the Global Radiation by the Transmisivity of the cover it was just a simplification that crossed my mind, but if one output give me a better result, I will not follow that methodology.

Best,
Mario

2018-04-24 8:03 GMT-05:00 <trnsys-users-request at lists.onebuilding.org<mailto:trnsys-users-request at lists.onebuilding.org>>:


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Date: Tue, 24 Apr 2018 11:44:31 +0000
Subject: Re: [TRNSYS-users] Incident solar radiation on greenhouse ground
Dear Mario,

surface output 79 (QSIAB: solar (direct+diffuse) radiation being absorbed at inside surface) is the one you are looking for.
What do you want to achieve exactly by multipling the Global Radiation by the Transmisivity of the cover?

Best,
Christoph

Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org<mailto:trnsys-users-bounces at lists.onebuilding.org>] Im Auftrag von Mario González via TRNSYS-users
Gesendet: Dienstag, 24. April 2018 00:36
An: trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>
Cc: Mario González <marioglezx at gmail.com<mailto:marioglezx at gmail.com>>
Betreff: [TRNSYS-users] Incident solar radiation on greenhouse ground

Dear TRNSYS users,

I am working on a greenhouse simulation using TRNSYS 17, and I want to know the Incident Radiation on the ground surface.

Is there an output from TRNBuild that gives me this data? I've seen the outputs (or NTYPEs) 12 (QSOLTR), 14 and 15 (QTABS), and the  surface output 79 (QSIAB), but I am not so sure which of these is the correct one.

Also I was thinking to just multiply the Global Radiation by the Transmisivity of the cover (simplifying a lot).

Thanks in advance,
Mario

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