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

[Michaël Kummert]

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> On Behalf Of
K.R. Gunawardena via TRNSYS-users
Sent: April 9, 2021 10:44
To: David BRADLEY <d.bradley at tess-inc.com>; TRNSYS users mailing list at
OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc: K.R. Gunawardena <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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Thermal Energy Systems Specialists, LLC
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