Re: [TRNSYS-users] Air Cooled Chiller ( Type 655 ) - Major problem

[a8304506@graduate.hku.hk]

Hello, Shahrestani.

In order to figure out the problem, can you attach the project file also?

Best Regards
LEE, Chun Kwong
Division of Building Science and Technology
City University of Hong Kong

Quoting mahdi shahrestani <mahdishahrestani@yahoo.com>:

> Dear Erik
> Many thanks for your reply.
> ?> I have implemented your advice but the problem has not been solved.
> It seems that changing two columns only substitute the cop and capacity
> ratios and could not be able to solve?he problem of disconnection between
> chilled water set point temperature and ambient temperature with outputs
> (like COP).
> ?> With the old data file of COP and capacity ratios I have got result as
below:
> Input Output 
> Chilled water temperature set point Ambient temperature COP 
> 7 20 2.5 
> 7 30 2.5 
> 7 40 2.5 
> 4 20 2.5 
> 4 30 2.5 
> 4 40 2.5 
> ?> Substitution of cop and capacity ratio columns in data file and generating
> the new data file culminates in the following results 
> Input Output 
> Chilled water temperature set point Ambient temperature COP 
> 7 20 2.1 
> 7 30 2.1 
> 7 40 2.1 
> 4 20 2.1 
> 4 30 2.1 
> 4 40 2.1 
> ?> As you see there is no any connection between chilled water set point and
> ambient temperature with outputs.
> Changing those two input parameters have not any effect on output COP?
> ?> I was wondering of any other comment and suggestion to solve the issue.
> ?> ?> Many thanks 
> Mehdi Shahrestani
> 
> 
> 
> 
> ________________________________
> From: "knut.erik.enerstvedt@niva.no" <knut.erik.enerstvedt@niva.no>
> To: mahdishahrestani@yahoo.com
> Cc: trnsys-users@cae.wisc.edu
> Sent: Mon, May 31, 2010 8:20:06 AM
> Subject: Re: [TRNSYS-users] Air Cooled Chiller ( Type 655 ) - Major problem
> 
> 
> Hello, 
> 
> The example datafile for Type 655 is incorrect. The first column in the
> datafile should be COP ratios and the second column should be capacity
> ratios, not the other way round as in the example file. You can check the
> source code for Type 655 to see this. Try switching the two columns and you
> should see a change in COP. 
> 
> Kind regards, 
> Knut Erik Enerstvedt 
> 
> 
> 
> >Hello everybody 
> ?> >I have problem in using type 655 Air cooled chiller. It is strange when I
> change the ambient and chilled >water set point temperature neither COP and
> Power consumption would be changed. 
> >It is clear that the cop and energy consumption should be change by those
> two parameters but it is another >strange element in Trnsys.
> ?> >I was wondering if you could give me a clue to tackle it.
> ?> >Many thanks for your time 
> >Mehdi Shahrestani
>
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