[TRNSYS-users] Changing the role of a standard component

[David Bradley]

Papia,
   Type91 calculates the heat transfer rate across the heat exchanger based 
on the conditions (temperature and flow rate) at the inlets and on the 
effectiveness specified by the user. The place you need to start is with 
the 05-Mathematical Description manual to resolve the equations that Type91 
uses so that the heat exchange rate is known and some other variable 
(outlet temperature of one side of the HX for example) is unknown. As Diego 
and I mentioned in our previous emails, you would then need a Fortran 
compiler in order to write a new component for TRNSYS.
Kind regards,
  David


At 20:32 3/25/2007, papia sultana wrote:
>Dear Diego,
>Thanx for your interest.
>In my problem, I am using 'type 14 h' to read a variable cooling load (let's
>say within 0 to 24 hr). Next, I am linking this to a 'type 91' HE through an
>appropriate equation 'equa' (needed to convert the unit). For the HE of
>'type 91', I would like to link the 'cooling load' in terms of 'heat
>transfer rate' in the input list. So that new input list could be: heat
>transfer rate, hot side flow rate, cold side inlet temp, cold side flow
>rate. The output list may remain same or could cut down one/ two. My point
>is, how could I modify the component 'type 91' to cop with variable load?
>
>best regards
>Papia
>
>
>
>
> >From: "Diego A. Arias" <daarias at wisc.edu>
> >To: papia sultana <papia_s at hotmail.com>
> >CC: trnsys-users at engr.wisc.edu
> >Subject: Re: [TRNSYS-users]  Changing the role of a standard component
> >Date: Fri, 23 Mar 2007 09:35:30 -0500
> >
> >Dear Papia,
> >
> >Changing a component is more than changing the proforma.  You need to
> >change the mathematical formulation, which is done in a Fortran compiler.
> >If you need to modify a standard component, please feel free to send me a
> >more detailed description of what you need and I may be able to help you.
> >Best regards,
> >
> >Diego
> >
> >
> >papia sultana wrote:
> >>Dear TRNSYS users,
> >>
> >>I have just started to use TRNSYS for centralized cooling system and I am
> >>just a novice. I would like to know If I change any of the output variable
> >>to an input variable or vice-versa to a component, do I need to generate
> >>new component?  If not, I am not able to change any of the variable
> >>properties from the Proforma dialogue box even after saving the changes?
> >>
> >>btw I will highly appreciate If any body like to share a basic central
> >>cooling model with me.
> >>
> >>Best regards
> >>Papia
> >>
> >>
> >
> >
> >--
> >Diego A. Arias
> >TRNSYS Coordinator
> >Solar Energy Laboratory
> >University of Wisconsin - Madison
> >1500 Engineering Drive
> >Madison, WI 53706
>
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