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Re: [TRNSYS-users] FW: Net radiation received on a specific internal surface - Type 56



Michaël and Marion,

  Might it be possible for that diagram to work its way (with a nice big reference to the generosity of its author of course!!) into the Type56 manual? We get this question a lot on the hotlines.

db

On 04/12/2021 05:11, hotline via TRNSYS-users wrote:

Michaël,

 

your overview  explains the balance of an external opaque surface very well.

The only “missing” feature is the surface gain on the “outside face”.

This gain is included in QABSO (NTYPE 22 ). Therefore, QABSO isn’t  “short wave radiation” only if a surface gain on the “outside face” is defined.

 

Marion

 

 

Transsolar Energietechnik GmbH | Curiestrasse 2 | 70563 Stuttgart | Germany

CEO: Matthias Schuler, Thomas Auer, Stefan Holst, Dieter Schnelle

Registered at Amtsgericht Stuttgart HRB 23347 | USt-IdNr.: DE 152272639

 

Von: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> Im Auftrag von Michaël Kummert via TRNSYS-users
Gesendet: Samstag, 10. April 2021 19:04
An: 'TRNSYS users mailing list at OneBuilding.org' <trnsys-users@lists.onebuilding.org>
Cc: Michaël Kummert <michael.kummert@gmail.com>
Betreff: Re: [TRNSYS-users] FW: Net radiation received on a specific internal surface - Type 56

 

Kan,

 

I struggled with those Type 56 outputs recently and I came up with the attached interpretation.

I hope this helps, and I hope someone from Transsolar will correct me if I misinterpreted some outputs.

 

Michaël Kummert

Polytechnique Montréal

 

From: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> On Behalf Of K.R. Gunawardena via TRNSYS-users
Sent: April 9, 2021 10:44
To: David BRADLEY <d.bradley@tess-inc.com>; TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>
Cc: K.R. Gunawardena <krag2@cam.ac.uk>
Subject: Re: [TRNSYS-users] FW: Net radiation received on a specific internal surface - Type 56

 

Many thanks David for your response and clarification!

 

QIBAB and QIDAB would address shortwave absorption. What about the longwave exchange?

 

I am currently working under the following assumptions:

 

To get the radiative gains for the internal/indoor wall’s surface  =  radiative airnode internal gains received by wall (assumed to be given by QRGAB)  +  solar gains through zone windows received by walls ( assumed as QIBAB + QIDAB or QSIAB as a total?)  +  longwave radiation exchange between this wall and all other walls and windows (QABSILW? not sure about this one).

 

Your clarification is greatly appreciated!

 

Best regrads,

Kan

 

From: David BRADLEY <d.bradley@tess-inc.com>
Sent: 09 April 2021 15:12
To: TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>
Cc: K.R. Gunawardena <krag2@cam.ac.uk>
Subject: Re: [TRNSYS-users] FW: Net radiation received on a specific internal surface - Type 56

 

Kan,

  I often use QIBAB and QIDAB (NTypes 80 and 81). Those are the quantities of radiation absorbed (as opposed to incident) on the inside surface, however.

  Wall gains are specified as totals, not per square metre.

kind regards,

 David

 

On 04/09/2021 05:15, K.R. Gunawardena via TRNSYS-users wrote:

Hi,

 

I am trying to get clarification on a couple of issues.

 

I am trying to couple a bespoke component with Type 56 to calculate surface evaporative flux. I want to input the net radiation received on a specific internal surface as an input to this component. Which trnsys output best represents the net radiation energy received by an internal surface?

 

Second, when specifying a wall gain, do we provide the value for the entire wall or m^2?

 

Answers are greatly appreciated,

Best regards,

Kan

 

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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com