From: David Bradley <bradley@tess-inc.com>
To: "papia sultana" <papia_s@hotmail.com>,daarias@wisc.edu
CC: trnsys-users@engr.wisc.edu
Subject: Re: [TRNSYS-users] Changing the role of a standard component
Date: Mon, 26 Mar 2007 16:19:46 -0500
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@wisc.edu>
>To: papia sultana <papia_s@hotmail.com>
>CC: trnsys-users@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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