Re: [TRNSYS-users] Theoretical flat-plate collector

["Matt Duffy" <duffy@tess-inc.com>]

Dear TRNSYS Li Mei and Stefania Agosta,

Try setting the constant input values: your inlet temperature of your
Typ73 collector equal to the ambient temperature. Assuming that you are
familiar with the efficiency curve (eqn 5.10.5-1), efficiciency vs.
(Tin-Tamb)/It, you may determine the efficiency intercept by setting the
ambient temperature equal the inlet temperature - essentially dropping the
loss cofficient, U_L. Set your inlet temperature (Tin) equal to your
ambient temperature (Tamb as constant input values in the Type73 proforma,
and you should see some high efficiencies.

Best regards,

Matt



----- Original Message -----
From: "L.Mei@lboro.ac.uk" <l.mei@lboro.ac.uk>
Sent: Fri, October 9, 2009 5:49
Subject:Re: [TRNSYS-users] Theoretical flat-plate collector

Hi, I also met this problem.

Thanks!

Li Mei

-----Original Message-----
From: Stefania Agosta [mailto:stefania.agosta@dttn.it]
Sent: 09 October 2009 11:06
To: trnsys-users@cae.wisc.edu
Subject: [TRNSYS-users] Theoretical flat-plate collector

Hallo,

I'm using Type 73 to model a flat plate solar cllector for domestic
hot water. What mostly surprise me is that the efficiency of the
panel, which is calculated as (useful energy) / (incident solar
radiation),  is lower than expected (30%-40% as a maximum, instead of
80%-90%) even if I maximise all the parametres that affect the
efficiency. is it a common

Best regards

Stefania Agosta
student at the University of Trento
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----- End of original message -----