Re: [TRNSYS-users] Solar Cooling

["Mario Leroy Ortiz" <ortizm@unm.edu>]

Nikoleta Delatola,

I have forwarded you some type 107 absorption chiller data 
files
valid for a heat medium temperature range between, 71.1 
and 93.3 C,
cooling water temperature range of 26.7-31 C and a chilled 
water set
point of 7 C.  This data is for a Yazaki SH20 water fired 
absorption chiller.
You can see the manufacturer performance data the that the 
data files
were derived from if you google Yazaki SH20.

Also attached is a spreadsheet that I used to calculate 
the numbers
in the data files along with a TRNSYS project that I used 
to test
the numbers.  In the TRNSYS project you will have to edit 
the heat
medium temperature, heat medium flow rate, cooling water 
temperature
and chilled water inlet temperature to duplicate the test 
results in
the spreadsheet.  If you want to run at a flow rate 
different than
the rated flow rate of 17284kg/hr you will also have to 
configure the
type 107 absorption chiller to read the correct data file.

There are further explanations of these files on the 
TRNSYS mail
list under my name.

https://www-old.cae.wisc.edu/pipermail/trnsys-users/2008/thread.html

Thank you,

Mario Leroy Ortiz



The file that I have sent you is configured to produce
the first row of data in the spreadsheet with heat medium 
at 71.1 C
cooling water at 26.7 C.

On Thu, 11 Sep 2008 01:50:34 +0300
 Nikoleta Delatola <nikoleta_del@hotmail.com> wrote:
> Hello,
> I am trying to simulate a solar cooling system using 
> type 71 (evacuated tube collectors), type 107 (absorption 
> chiller) and type 51b (cooling tower) in order to cool a 
> 100m2 building (type 56) in Athens. I also use a storage 
> tank (type 60c). I have two problems running the program, 
> so i would be thankful for any help/ advice.
> 1) I use the external file given at the example data 
> files for type 107 and i wonder if it is possible to 
> change the range of the inlet hot water temperature since 
> the given one is too short and the values are too high 
> (108C-116C). I noticed that the model doesn't work 
> properly when using temperatures out of the range given 
> in the data file. If this is not possible is there any 
> other that i can use?
> 2)The main problem of my simulation is to keep the 
> temperature in the tank at the above range. I tried to 
> use the tank's auxiliary heater but the energy required 
> is too high and it also remains the same regardless the 
> total collectors' area. In addition when i use a smaller 
> tank (in order to achieve higher temperatures) i get the 
> following error: "A convergence problem was encountered. 
> Modification of the tolerances control card may cure the 
> problem" and also too many warning messages: ''The inputs 
> to the listed units have not converged at this time step. 
> The values at the last iteration will be used and the 
> simulation will proceed. Reported information: UNITS: 13 
> 17 26 27 12".
>
> Thanks in advance, 
> Nikoleta
>
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