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

[David BRADLEY]

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 at 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 at lists.onebuilding.org>
> *Cc:* Michaël Kummert <michael.kummert at 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 at lists.onebuilding.org 
> <mailto:trnsys-users-bounces at lists.onebuilding.org>> *On Behalf Of 
> *K.R. Gunawardena via TRNSYS-users
> *Sent:* April 9, 2021 10:44
> *To:* David BRADLEY <d.bradley at tess-inc.com 
> <mailto:d.bradley at tess-inc.com>>; TRNSYS users mailing list at 
> OneBuilding.org <trnsys-users at lists.onebuilding.org 
> <mailto:trnsys-users at lists.onebuilding.org>>
> *Cc:* K.R. Gunawardena <krag2 at cam.ac.uk <mailto:krag2 at 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 at tess-inc.com 
> <mailto:d.bradley at tess-inc.com>>
> *Sent:* 09 April 2021 15:12
> *To:* TRNSYS users mailing list at OneBuilding.org 
> <trnsys-users at lists.onebuilding.org 
> <mailto:trnsys-users at lists.onebuilding.org>>
> *Cc:* K.R. Gunawardena <krag2 at cam.ac.uk <mailto:krag2 at 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 at tess-inc.com <mailto:d.bradley at tess-inc.com>
> http://www.tess-inc.com <http://www.tess-inc.com>
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>
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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 at tess-inc.com

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

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