[TRNSYS-users] modelling a differential controller for a variable speed pump

[Hasan baig <mail2baig@gmail.com>]

Hi,

I wish to model a real differential controller for my variable speed pump. The controller works as a standard differential controller. If the switch-on difference is reached, the pump is activated. When the temperature difference falls below the adjusted switch-off temperature difference, the respective relay switches off. When the switch-on temperature difference is reached, the pump is activated at full speed for 10 seconds. Then, the speed is reduced to the minimum pump speed value (factory setting = 30 %). If the temperature difference reaches the adjusted nominal temperature difference, the pump speed increases by one step (10 %). If the difference increases by the adjustable rise value, the pump speed increases by 10 % respectively until the maximum pump speed of 100 % is reached. 

Any suggestions on how to model this pump in TRNSYS ?

regards

Hasan