Re: [TRNSYS-users] Transient behavior of the heat exchangers

[Kamyar Tanha <ktanha@ryerson.ca>]

Jeff,

The only variable in the factor is the time, I have daily water draw profile ready, I need to use the starting times of different water draws for this, I don't know how though!!

Kamyar

----- Original Message -----
From: Jeff Thornton <thornton@tess-inc.com>
Date: Friday, March 4, 2011 2:01 pm
Subject: Re: [TRNSYS-users] Transient behavior of the heat exchangers
To: Kamyar Tanha <ktanha@ryerson.ca>, trnsys-users@cae.wisc.edu


> <I want to model a heat recovery unit and I need to get the transient
> behavior of the unit before it reaches it is steady point, which is the
> cast the existing heat exchangers in TRNSYS library are doing. I have 
> the
> scaling factor that should be multiplied by the steady-state effectiveness
> to get the transient one, the only problem is I don't know how I can
> define this in the code. Any suggestions??>
> 
> What are the independent variables in the scaling factor correlation? 
> 
> Time, temperature change, flow rate?  Based on your answer, I would
> suggest re-coding the heat exchanger model to set the heat exchanger
> effectiveness as a function of these independent variables.  On a TRNSYS
> difficulty scale this is probably a 6 out of 10 as you need to be able 
> to
> re-code, re-compile, and re-link TRNSYS.
> 
> 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
>