Variable resistor in AC chiller

[FrogBite]

I would like to know whether it is possible to use a variable resistor in a chiller circuit in order to change the cooling capacity of the chiller? Also, is there a minimum voltage which should not be passed or does the compressor just stop working at a certain point?

[august123]

you can not change speed of an AC Compressor motor by different voltage. When you have 3 phase motor, use an frequency modifier, if its single phase motor its really difficould.
Resistor will not work at all!
You can build in a sort of valve that lets you change refrigerant flow in the chiller, that means temperature and cooling capacity can be changed.

[FrogBite]

ok, thx for the reply but how does then the temperature input in an air conditioner work? As in an air conditioner you have a temperature delta of 1C so you can increase/lower the exhaust air temperature by 1C.

[Xeon th MG Pony]

It's called a thermistate it cycles the compressor on or off as needed. Best way to control load on a chiller is hot gas bypase to simulate load to bring temps up, or in other words re reduce the capacity of the compressor.