[TRNSYS-users] mean radiant and operative temperature

[Marion Hiller]

Dear Karol,

 

just a brief answer:

 

1.)     The parameters of Type are defined in the Trnsys Studio at the
Tab parameter

 

2.)     The two NTYPEs are the same if 
- the thermal zone has one airnode only and
- longwave radiation mode = STANDARD

 

NTYPE 24: For being backwards compatible it is always calculated by

 

           DO NS=N1,N2 ! all surfaces of airnode

            OUT(IOUT)=OUT(IOUT)+AREA(NS)*TSI(NS)

            TOTAREA=TOTAREA+AREA(NS)

           ENDDO

      OUT(IOUT)=OUT(IOUT)/TOTAREA

 

 

         NTYPE 120: 

                     a) Longwave radiation mode = STANDARD:
           DO NS=N1,N2 !all surface of zone to which airnode belongs

             TMSURF=TMSURF+AREA(NS)*TSI(NS)

             TOTAREA=TOTAREA+AREA(NS)

           ENDDO

           OUT(IOUT)=TMSURF/TOTAREA !area weighted mean surface
temperature

 

          b) Longwave radiation mode = DETAILED:
                          caluclation based Gebhart factors. The Gebhart
method  involves the view factor from the comfort point to the surfaces 

                          and the therewith the position in the room
with respect to the surrounding surfaces.

 

Best,

 

Marion

 

 

  _____  

Von: Karol Bandurski [mailto:karol.bandurski at put.poznan.pl] 
Gesendet: Freitag, 30. März 2012 17:20
An: trnsys-users at cae.wisc.edu
Betreff: [TRNSYS-users] mean radiant and operative temperature

 

Dear All,

 

I have 2 question:

 

1)      In manual vol. 5 (introduction) I have read:

 

The third parameter gives the WEIGHTING FACTOR between air and mean
surface temperature for the calculation of an operative room
temperature. The inputs and outputs of TYPE 56 depend upon the building
description and options within the TRNBUILD program. TRNBUILD generates
an information file describing the outputs and required inputs of TYPE
56.

 

Where can I found/ set this factor?

 

2)      What is the exactly difference between:

NTYPE 24 

TMSURF 

weighted mean surface temperature of airnode 

[°C] 

and

NTYPE 120 

TMRLW 

Mean radiant temperature (longwave only) 

[!C] 

 

The first is calculate according to surface area, and second is
calculate according to surface area and distance from person?

 

Kind regards,

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

Karol Bandurski MSc.

Institute of Environmental Engineering

Poznan University of Technology

www.ee.put.poznan.pl

www.put.poznan.pl

 


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