[TRNSYS-users] Type 2b controller dead band problem.

[Michael Bissett <mikebiscuit@gmail.com>]

Dear Trnsys

I am experiencing problems with a simple type 2b controller.

I am using a solar collector type 564b

I am trying to compare the temperature of the output of the collector with output of the tank, getting a temperature difference. I have set the dead band from 4-10 degrees C.

In the simulation as the temperature rises to 10degrees difference, the control signal is 1 switching the pump on correctly. but after this the controller only switches every time step. I have tried shortening the time step... and changing other parameters.. still with no success.

I have attached the file.

Yours Sincerely

Mike Bissett

Department of Electrical Engineering

University of Cape Town 

South Africa

Attachment: test 18.TPF
Description: Binary data