RE: detailed flat plate collector model

["Yoshinaga Mika" <yoshi@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Dear Christophe,

I don't have the full-code, which you just want.
however, this may be your help.

as Michaël said, TYPE 73 has the groval heat loss factor as UL.
see the following code in TYPE73.
STF1 is the coefficient of topside convection heat losses,
STF2 is the coefficient of topside radiation heat losses,
UBE is the edge and back loss coefficient (set as PARAMETER #5).
If you'd like to know UB(backside loss) and UE(edge loss) separately, you
should estimate them beforehand.

In TYPE73, top loss coefficient is calculate twice in order to inprove the
accuracy.
If you set them as outputs, pay attention please.

you can know the detailed informations on a famouse reference book "SOLAE
ENGINEERING OF THERMAL PROCESSES Second Edition, by Duffie and Beckman".

C       USE KLEIN'S TOP LOSS CORRELATION
         TMC=TM+273.15
         TAC=TAMB+273.15
         IF (TMC.LE.TAC) TMC=TAC+1.0
         F=(1.0-0.04*HWIND+5.0E-04*HWIND*HWIND)*(1.0+0.091*XNG)
         C=365.9*(1.0-0.00883*SLOPE+0.0001298*SLOPE*SLOPE)
         STF1=C/TMC*((TMC-TAC)/(XNG+F))**0.33
         STF1=XNG/STF1+1.0/HWIND
         STF1=1.0/STF1
         STF2=1.0/(EP+0.05*XNG*(1.0-EP))+(2.*XNG+F-1.)/EG-XNG
         STF2=SIGMA*(TMC*TMC+TAC*TAC)*(TMC+TAC)/STF2
         UL=(STF1+STF2)*3.6+UBE
         OUT(10)=UL
         GO TO 210

also TYPE73 calculates the product of the cover transparent factor and the
absorber absorptance as TALN*XKAT.
you can obtain GT(1-TALN*XKAT) as optical reflexion from the cover to the
surrounding.

Regards,
Mika

================================
Mika Yoshinaga, Nagoya Univ, Japan
yoshi@davinci.nuac.nagoya-u.ac.jp
================================

-----Original Message-----
From: owner-trnsys@relay.doit.wisc.edu
[mailto:owner-trnsys@relay.doit.wisc.edu]On Behalf Of Plantier
Christophe
Sent: Tuesday, June 04, 2002 07:09
To: trnsys@relay.doit.wisc.edu
Subject: detailed flat plate collector model

Dear trnsys users,

I'm looking for a detailed flat plate collector model. The aim is to obtain,
as OUTPUT, the different collector losses :

- backside heat losses (conduction through insulating material) ;
- topside convection heat losses ;
- topside radiation heat losses ;
- optical reflexion from the cover to the surrounding.

If somebody knows such a model, I'm very interrested to get the detailed
description (mathematical description, inputs, parameters, outputs,...) and
the source code perhaps.

Thanks for your help,
Christophe.