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Building subzero Glycol Chiller from 2 ton window AC unit???

 
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post #1 of 3 (permalink) Old 03-19-2019, 08:09 AM - Thread Starter
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Building subzero Glycol Chiller from 2 ton window AC unit???

Im looking to take a 2 ton window AC unit and build a glycol recirculating chiller. Most AC unit evaporators will not get below sub zero temps. is there a refrigerant type change or modification that can be made to a 230v 2600watt 2-ton window ac to get the evap coil temps lower? the colder the better for my needs. this sized unit is typically 40-45oz of R410a refrigerant with 450psig high side and 250psig low side pressures.
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post #2 of 3 (permalink) Old 03-24-2019, 06:01 PM
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The evaporator can get below subzero, it's just that the controls generally don't let it. They can be rewired to run continuously. Glycol does not work well at these temps since it turns into a 7-11 slushee lol. I recommend an ethanol/water half and half mix. Basically cheap Vodka would work well. Alcohols flow much better at low temps. Go with a refrigerant with a low boiling point like R22, if you can find it. My R22 1/2HP chiller (former dehumidifier) can bring the liquid down to -30C.

Adding more capacity will not lower the temp much - a 2HP compressor is more than enough (~1600W)
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post #3 of 3 (permalink) Old 03-24-2019, 06:11 PM
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Quote: Originally Posted by Hydroplane View Post
The evaporator can get below subzero, it's just that the controls generally don't let it. They can be rewired to run continuously. Glycol does not work well at these temps since it turns into a 7-11 slushee lol. I recommend an ethanol/water half and half mix. Basically cheap Vodka would work well. Alcohols flow much better at low temps. Go with a refrigerant with a low boiling point like R22, if you can find it. My R22 1/2HP chiller (former dehumidifier) can bring the liquid down to -30C.

Adding more capacity will not lower the temp much - a 2HP compressor is more than enough (~1600W)
Exactly this.
You need to wire the pump so it's always running or use a different thermostat so it can cool to a desired temp.
As @Hydroplane said antifreeze/glycol aren't good enough, you need something volatile like alcohol because it's freezing to boiling scale is much lower than glycol. Isopropyl alcohol freezes at -89°.

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