Re: [TRNSYS-users] type 108 on off control

[David BRADLEY <d.bradley@tess-inc.com>]

Safwan,
  I am not sure I understand your problem statement. Is your monitored temperature always 26C, your cooling set point 20.5C and the deadband 0.5 and yet the controller is turning on and off? If that is the case then you should send your project file (*.tpf) and any other files needed to run the project to your distributor for debugging.
  If the temperature you are monitoring is holding between 20C and 21C then the controller appears to be functioning properly.
regards,
 David

On 12/16/2014 20:17, Safwan Kanan wrote:

Dear All,

I am simulating solar cooling absorption chiller and I am using type 108 on/off thermostat to control room temperature with all pumps ,fans ..etc.

with this information:

monitoring temp=26 C

1st stage cooling set point=20.5 C

2nd stage =35C

No heat.

dead band =0.5 C

I got most of the time on and off for all system types controlled.

for example on for 5 min then off 10 min and on 5 min.as shown in attached photo.

any idea to solve this issue please?

Regards,

Safwan Kanan

Manchester University

Manchester

M13 9PL

UK

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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
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d.bradley@tess-inc.com

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