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

[hotline]

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


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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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