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Turn off a hotplate permanently (Permanently change a variable)
Posted 14.01.2015, 04:15 GMT-5 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.4 1 Reply
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I have a hotplate that I want to turn off permanently when it reaches 230 °C, and I need some help. I have a heat input of 285 W and a Domain Point Probe ppb1 that measure temperature.
I have tried q = 285*(ppb1<=230 [degC]) …. This works fine and turn the hotplate off at 230 °C, BUT as the hotplates cools and gets a temperature below 230 °C the hotplate turns on again.
What I need is an expression saying:
a = 1
if ppb1>230[degC]
a=0
end
q = 285*(ppb1<=230 [degC])*a
Can someone help me? Point me in the right direction?
Best regards
Bjarne
Hello Bjarne Christian Hagen
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You will find the approach outlined here helpful:
www.comsol.com/blogs/implementing-a-thermostat-with-the-events-interface/
Best,