What determines the maximum cooling temperature that is possible from a chiller? My understanding is that if you were using a refrigerant that boiled at 43 degrees C, then theoretically you could cool down close to this temperature regardless of the cooling capacity of the chiller. For example, a 100KW chiller would take longer than a 250KW chiller to get the glycol down to -18 degrees C but it would still eventually get there (on a recycle loop through the chiller). Does it then depend on the size of the compressor? I have to cool down 40,000 L of a 50% solution of Ethylene Glycol from ambient temperatures down to -20 degrees C.
Topic: What determines the maximum cooling temperature that is possible from a chiller?26 January 2012
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Jim Grant Forum Moderator 114 Posts
Re: What determines the maximum cooling temperature that is possible from a chiller?26 January 2012 at 1:29pmIf you are operating on a batch basis then you are correct that it will take longer to chill the batch of glycol. The temperature which the chiller operates at is determined by the suction pressure of the compressor and the vapor pressure curve of the refrigerant. Once you have determined the thermodynamic cycle for the chiller system, the operating temperature of the evaporator determines the minimum temperature achievable.