[TRNSYS-users] operative temperature

[leen peeters]

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 at 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 at 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 at 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 <http://www.ee.put.poznan.pl/>
>
> Poznan University of Technology
>
> www.put.poznan.pl/~karol.bandurski
>
> www.ee.put.poznan.pl
>
>
>
>
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