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

Diego A. Arias daarias at wisc.edu
Tue Mar 27 07:43:34 PDT 2007


Dear Papia,

Please find attached the same project created with TRNSYS16.00.0038.
Best regards,

Diego

papia sultana wrote:
> Hi Diego,
> Thank u for your help. The attached file u send previously, probably 
> with the latest version, so I could not open it. Currently I am using 
> TRNSYS 16. Is it possible to send that  problem compatible with 16?
>
>
> 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: Mon, 26 Mar 2007 16:33:48 -0500
>>
>> Hi Papia,
>>
>> I just thought of a way of doing this without a Fortran compiler.  
>> You can use a Type22-Feedback controller, to find the right input 
>> that minimizes the error between a set point and a measured signal.  
>> In this case, your set point is the heat transfer rate that you want 
>> (from Type14), and the measured signal is the result from Type91 
>> (actual heat transfer rate).  The control signal from Type22 can be 
>> used to modulate (for our purposes, calculate) the mass flow rate 
>> that will yield the heat transfer rate that minimizes the error.
>>
>> I am attaching an example project.  The example is very simple. I do 
>> not know if in a more complex simulation it may become more difficult 
>> to follow this strategy.  I will appreciate any comments.
>>
>> Best regards,
>>
>> Diego
>>
>>
>>
>>
>> David Bradley wrote:
>>> 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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>>>
>>> **************************************************************************************** 
>>>
>>>
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>>> David BRADLEY                           2916 Marketplace Drive - 
>>> Suite 104
>>> Partner                                        Madison, WI 53719
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>>>
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>>>
>>>
>>>
>>>
>>
>>
>> -- 
>> Diego A. Arias
>> TRNSYS Coordinator
>> Solar Energy Laboratory
>> University of Wisconsin - Madison
>> 1500 Engineering Drive
>> Madison, WI 53706
>
>
>> << UsingOutputsToCalculateInputs.tpf >>
>
> _________________________________________________________________
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