[TRNSYS-users] Need helps to solve the absorption chiller (Type 677) issue

[Billy Chen <coolbilly1999@gmail.com>]

Hi TRNSYS users,

 

I am building an absorption chiller model for a medium office, and I used the similar components from the TESS example (Restaurant with absorption chiller). However, when I ran the simulation, I got tons of warnings (from SYS Message 441), and the simulation terminated because it exceeded the limit of warnings. The warning said as below:

 

*** Warning at time       :      3717.000000
    Generated by Unit     : Not applicable or not available
    Generated by Type     : Not applicable or not available
    TRNSYS Message    441 : The inputs to the listed units have not converged at this timestep. The values at the last iteration will be used and the simulation will proceed.
    Reported information  : UNITS: 12  13  18

 

UNIT 12 is Type 677 double effect chiller

UNIT 13 is Type 144 pump

UNIT 18 is Type 697b cooling coil

 

I checked the input units and I can't figure out the problem. Could someone give me some advice?

 

And I also found out a problem when I ran the TESS Restaurant example, the chilled water outlet temperature is always going up over 100 degree C. But the temperature from the air temperature  from cooling coil looks reasonable. It confuses me a lot. Does anyone find this problem before and have any suggestion on that?

 

I attached the LST file and the plot for the chiller water temp. I really appreciate any help.

 

Best regards,

 

Billy

Attachment: Medium Office Building.lst
Description: Binary data

Attachment: ChillerWaterOut.jpg
Description: JPEG image