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Re: [TRNSYS-users] A Multi-zone slab-on-great heat transfer model withzone air temperature as an input variable?




Dear Simge Andolsun,

The Type49 Multizone slab-on-grade model instead uses the heat flux through the surface as an input (the QCOMO output of the Type56 building model) and calculates the surface temperatures that are passed back to Type56. Type56 uses this surface temperature for the calculation of the zone air temperature with either the internal surface automatic or user-defined convection coefficient. That is essentially how the BOUNDARY walls in Type56/TRNBuild function. If you would indeed like to pass a zone air temperature to a slab-on-grade model, please consider using Type1255 from the TESS Ground Coupling Library as it does an energy balance at the surface. However, this model is not intended to function with the Type56 building. Please see the attached comparison sheet for more information about the different slab-on-grade models. Also, please contact your local TRNSYS distributor to obtain the lastest TESS Component Libraries for TRNSYS17. It appears that you may have an outdated ve! rsion as the new models replaced Type704.

Best regards,

Matt Duffy

----- Original Message -----
From: "simge andolsun" <simgeandolsun@gmail.com>
Sent: Thu, March 22, 2012 13:30
Subject: [TRNSYS-users] A Multi-zone slab-on-great heat transfer model withzone air temperature as an input variable?

Dear TRNSYS users,

I need to enter the zone air temperatures of a zone (zone A) to
calculate the slab-soil interface temperatures. This zone is attached
to two other zones (B and C) which have different zone air
temperatures from each other and from zone A throughout the year. So,
I need a multi-zone slab-on-grade model that accepts "zone air
temperatures" as an input variable.

As far as I know, Type 704 has zone air temperatures as an input
variable; however this model is not a multi-zone slab-on-grade model.
The multi-zone slab-on-grade model (Type 49), on the other hand, needs
to iterate with Type 56 and Type 56 does not allow the zone air
temperatures to be entered as an input variable. In Type 56, the zone
air temperatures are rather a result of the calculations.

Would you please let me know how may I solve this issue? Is there a
way to connect the Type 704 models to each other to model a multi-zone
slab-on-grade heat transfer? .. or is there any other model in TRNSYS
that allows the zone air temperatures to be entered as an input
variable and does multi-zone slab-on-grade heat transfer calculations?

I look forward to hearing from you,

Best Regards,
Simge Andolsun
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Attachment: TESS Ground Coupling Comparisons.pdf
Description: Adobe PDF document