Chiller Project: So far dissapointing

[jjjc_93]

Hey guys,

I'm trying to get a decent water chilling going to use on my 775 benching rig, but I'm so far not getting anywhere near the results I was hoping for.

I bought myself a cheap portable aircon unit from somebody who had moved and no longer needed it. It's the Dimplex GDC-AC9RW 2.6kw airconditioner.

I stripped down the unit, leaving all wiring the same. Took the fan off the evap, dunked the evap in an esky and found it's only getting down to about -5c while liquid in the immediate area is sitting at 7c. Ambient = 18c.

I was expecting and hoping for -10c+ at the evap and into subzeros in the liquid, but it's just not happening

I have put the thermostat in the hot air exhaust so nothing is cutting out, and I have left all the controllers and wiring the same. I just set the A/C to it's lowest temperature settings and let it go at it. Would it help at all if I looked at removing the temperature controller?

Thanks in advance for help, I hope to have some pics up soon, just need to get myself organised.

[n00b 0f l337]

What liquid are you using, and it sounds like you dis-wired it correctly so no not much else to do. Is it a 2.6kw unit, or a 2600btuh unit?

[jjjc_93]

What liquid are you using, and it sounds like you dis-wired it correctly so no not much else to do. Is it a 2.6kw unit, or a 2600btuh unit?

2.6kw, which I believe equates to roughly 8000btu if we convert from kilowatt hours.

I haven't rewired anything, but I'm thinking that isn't the problem aswell, since the aircon is bound to run at 100% until it needs to cut out via thermostat, which isn't happening. Pictures coming in the next couple of hours, need to setup a work space for myself.

[wdrzal]

A 2.6kw (2600watts X 3.412btu/per watt= 88711.2 BTU) Ac unit is designed to have a evap temperature of ~45F with with ~300cfm of air flow through it.

To get lower temperatures you will need to adjust the charge and most likely the cap tube to get the lowest temperature possible.

[jjjc_93]

Sorry for not getting back to anyone or updating anything, but I did follow through and finish making the chiller. Got -20c at CPU with no load.

Here's the finished product for any interested: