Re: [TRNSYS-users] efficiency of solar collectors

["Jeff Thornton" <thornton@tess-inc.com>]

TESS will be releasing an updated version of the solar collector library in a few weeks that includes the following changes:

Quadratic efficiency equations for inlet, average, and outlet temperature forms of the efficiency equation

Improved temperature seeking controls

Updated incidence angle modifier algorithms for diffuse radiation

These changes will eliminate your need to convert back to the linear form.  So if you can wait a bit you won't have to do the regression.

Jeff

Jeff Thornton 
 President - TESS, LLC 
 
 22 North Carroll Street - Suite 370
 Madison WI 53703 USA 
 
 Phone: 608-274-2577 
 Fax: 608-278-1475 
 E-mail: thornton@tess-inc.com 
 Web: www.tess-inc.com

----- Or! iginal Message -----
From: "Andrés Montero" <andresmonteroi@gmail.com>
Sent: Wed, June 1, 2011 16:16
Subject: [TRNSYS-users] efficiency of solar collectors

Hello,

 

Does anyone knows how to convert a quadratic efficiency equation (eta=a0-a1*(DT/I)-a2*DT^2/I with DT=0.5*(Tfluid_outlet-Tfluid_inlet)-Tamb) of a parabolic trough collector to a linear efficiency equation (eta=a-b*DT/I)? I need this conversion in order to use Type 536.

 

Thank you

 

Andrés
 

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