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Re: [TRNSYS-users] operative temperature

Karol,
 
in TRNBUILD, when you defined a zone, you can define a comfort type.  When you do so, you see that there are 2 ways to define it. One is based on surface averaged temperatures, when takes into account your geoposition.
Even if the position of your object is known, TRNSYS will not calculate its impact on view factors.
If you want to do that, you can demand surface temperatures as output as well as the air temperature, and perform the comfort calculation in TRNSYS using an equation writer. You will be one timestep late, but if you chose them small enough, you should be OK.
 
leen


On Mon, Dec 2, 2013 at 11:42 AM, Karol Bandurski <karol.bandurski@put.poznan.pl> wrote:

Leen,

 

Thanks for this tips, your PhD is helpful.

 

But now I would like what is TRNSYS code – which way does TRNSYS calculate operative temperature?

Does program take into account also heat gain in the zone or only surfaces and air temperature?

 

Karol

 

From: leen peeters [mailto:l.f.r.peeters@gmail.com]
Sent: Friday, November 29, 2013 9:43 PM
To: TRNSYS users mailing list at the Solar Energy Lab, UW-Madison
Subject: Re: [TRNSYS-users] operative temperature

 

Karol,

 

that depends on the viewfactors. the operative temperature sensed by a person depends on his/her location in a room.

If you check the book of Ole Fanger, you will be able to find that explanation. A part of it, specifically applied to a radiator case is also in my PhD.

 

If the 'radiating object' is close to a person and the location of the person in the zone is thus clearly defined, his/her actual thermal sensation will be influenced by the radiating object in case it is large enough or the temperature is high enough.

 

However, the added value of a detailed calculation is limited in case the real life scenario would be one where furniture is blocking the viewfactors between radiating object and person.

 

 

Leen

 

 

 

 

 

On Fri, Nov 29, 2013 at 5:25 PM, Karol Bandurski <karol.bandurski@put.poznan.pl> wrote:

Dear All,

 

Do you know which objects are taken into account in operative temperature calculation?

 

Air, walls, floor, ceiling for sure, but for example radiative heat gain that is modeled in zone?

 

I will be grateful for any comments!

 

Regards,

Karol

 

------------------------------------------------

Karol Bandurski MSc.

Institute of Environmental Engineering

Poznan University of Technology

www.put.poznan.pl/~karol.bandurski

www.ee.put.poznan.pl

 


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