[TRNSYS-users] OUTPUT Transmission losses through windows

hotline hotline at Transsolar.com
Mon Feb 1 08:19:17 PST 2021

Hi Toni,

as the modelling in TRNSYS is more detailed than just a transmission based on a U-Value, there is no single NType for transmission. You can calculate the transmission losses from a zone through a surface (window/ opaque) by subtracting the surface's absorption from the total heat transfer from the zone to the surface

QTrans_Sx = QCOMI_Sx - QABSI_Sx (+ into zone, - from zone to outside)

NType 19 - QCOMI - energy from inside surf. incl. conv. to air and longwave radiation to other surfaces
NType 21 - QABSI - absorbed (or transmitted) at inside surf (includes solar gains, radiative heat, internal radiative gains and wallgains, except longwave radiation exchange with other walls) [kJ/hr]

Best regards,

Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> im Auftrag von Toni Calabrese via TRNSYS-users <trnsys-users at lists.onebuilding.org>
Gesendet: Montag, 25. Januar 2021 10:10
An: David BRADLEY <d.bradley at tess-inc.com>; TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc: Toni Calabrese <toni.calabrese at ost.ch>
Betreff: [TRNSYS-users] OUTPUT Transmission losses through windows

Hi all,

for a comparison between two tools I would need to split the total transmission losses in order to have the two contributes (i.e. transmission losses through opaques and windows). Is there an output / a way to have ONLY the transmission losses through windows?

Thanks in advance


Toni Calabrese, MSc.

Wissenschaftlicher Projektmitarbeiter

toni.calabrese at spf.ch<mailto:toni.calabrese at spf.ch> | toni.calabrese at ost.ch<mailto:toni.calabrese at ost.ch>

T +41 58 257 4827

SPF Institut für Solartechnik

OST – Ostschweizer Fachhochschule

Oberseestr. 10 | CH-8640 Rapperswil | Switzerland | www.spf.ch<http://www.spf.ch> | www.ost.ch<http://www.ost.ch>

OST – Ostschweizer Fachhochschule ist der Zusammenschluss aus FHS St.Gallen, HSR Rapperswil und NTB Buchs.

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