[TRNSYS-users] Stratification and Radiation in TRNSYS

[hotline]

Dear Lukasz,

Yes, you can combine the 4 airnodes to one zone like below.

[cid:image001.png at 01D3DD7B.A849EF90]

Then define for every node a coupling between the upper and lower stacked node like in Figure 5.2.4-40: The COUPLING – window.

Christoph

Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] Im Auftrag von Lukasz Watly via TRNSYS-users
Gesendet: Donnerstag, 26. April 2018 11:47
An: TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc: Łukasz Wątły <lukaszwatly92 at gmail.com>
Betreff: Re: [TRNSYS-users] Stratification and Radiation in TRNSYS

Dear Christoph,

Thank you very much for your kind reply.

As I have read the positions recommended by you, I wonder if it is possible, by using only TRNSYS 17, to create two adjacent zones on top of each other in each room? If it is possible, can we have 4 nodes for stratification then?

Best regards,
Lukasz

2018-04-25 18:16 GMT+02:00 hotline via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>>:
Dear Lukasz,

for stratifications you can use coupling. In Trnsys 17 you can only connect two airnodes within a zone. In Trnsys18 up to 6 airnodes can be coupled. The airflow between airnodes is a user input. Please have a look into manual 05-MultizoneBuilding: 5.2.4.10. Coupling between airnodes of same zone (T17) or  5.2.7.10. Coupling between airnodes (T18)

In Radiation Modes of Thermal Zone you can set a Solar to air factor. Please have a look into manual 05-MultizoneBuilding: 5.2.4.12. Radiation Modes (T17) or 5.2.7.12. Zone Radiation Modes (T18)

The solid gets the heat from the source of heat by longwave radiation (Depends on the model you are using. Please have a look int o05-MultizoneBuilding: 5.2.4.12. Radiation Modes (T17) or 5.2.7.12. Zone Radiation Modes (T18)) and indirectly also by convection/heat conduction.

Regards,
Christoph

Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org<mailto:trnsys-users-bounces at lists.onebuilding.org>> Im Auftrag von Lukasz Watly via TRNSYS-users
Gesendet: Montag, 23. April 2018 16:07
An: trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>
Cc: Łukasz Wątły <lukaszwatly92 at gmail.com<mailto:lukaszwatly92 at gmail.com>>
Betreff: [TRNSYS-users] Stratification and Radiation in TRNSYS

Dear All,
I am writing to you with some questions that appeared while working on the model in TRNSYS. I am preparing a model of 3-storey building with low-temperature floor and ceiling heating installed.
I am interested in doing the vertical stratification on each and every floor of this building, meaning that I would like to have at least 4 different nodes on the given floor. Is it possible to do the stratification in this way with TRNSYS? If so, how could I approach it?
Next problem regards the aspect of radiation. As each air node represents each zone, the air normally does not receive any radiation heat, but the solid does. However, in the tutorial it is mentioned that air node receives heat radiation. My question is how does it happen in more details?

Lastly, if I have the solid between two air nodes, how can this solid get the heat from source of heat directly by radiation? How does it influence the air nodes?
I would be grateful if somebody could share his/her knowledge. Thank you in advance for your help.

I look forward to hearing from you.

Kind regards,
Lukasz Watly

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