Okay so I picked up a 11,000 BTU system for $40 evaporator still gets icy frost came in at 11 degrees Fahrenheit on a non digital prob. I have a 30 gallon res for it. One problem its huge lol. Would it be worth it just to get a much smaller like 10 gallon res with a 5,000 BTU ac? Would the temps be higher? What's the downside of a smaller system? Any insight would be great thanks!
If you got 11 F and frost on the evap with the fan running it has a leak and is under charged.........When a unit leaks, it gets colder,but you loose capacity.
Evap should be ~40+ to ~45+ F. The evap needs to always remain above 32F or a defrost cycle is needed. Ac units don't have a defrost cycle as they keep the temp above freezing all the time. Refer to a P/T chart for corasponding pressure to temperature for each gas.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????I forgot "you must"
No the fan was not running. The air around the evap was still. And I pressed an old temp probe against it and got 11 Fahrenheit. It was around the same temp yesterday though so could I really have a leak? Or do I just need to submerge it in an isolated fluid (antifreeze) to get lowest temp then check fluid temp? Or should I scrap my unit for a newer one
With out the fan temps can go lower,because you removed the heat load,you may be fine. Just go ahead with your plan.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????
So id be better off with my current 11,000 btu system? Or would I be better off with a more compact system? Because I may have to be somewhat mobile. And has anyone gotten cooler temps off evaporator fins? Or should I place in liquid for true temps
I think you need to read some refrigeration 101 books or good web sites.
I don't think you relize heat measured in (btu's,watts,kj/kg) is not the same as temperature (farenheit,celsius,kelvin)
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????
Isn't the btu rating the capacity of the machine? So a higher btu system can cool hotter components and more heat in the loop
Originally Posted by wdrzal
Your right about having more cooling power, but that doesn't mean that the higher btu system runs colder. They could both probably get down to the same low temperature when at idle. I would look at it this way, if you wanted to cool a pc that put out around 300 watts then both units would probably cool down to about the same temp. But, if you wanted to cool a pc that put out something crazy like 2000 watts, then there would probably be a difference in the amount of cooling in the two units. Just how much of a difference I couldn't tell you without any certainty though.
The real difference is going to be in the amount of money paid for the electric bill!!
Hope this helps.
Primary Rig: DFI Lan Party LT x48 (@453 FSB) // e8600 @ 4.3 Ghz (1.3V) // PNY XLR8 DDR2 @ 1088 MHz (2.0V) // X-Fire Sapphire 1Gb 4870 // WD Raptor 160 GB (XP) // Seagate Barracuda 500 GB (Win7) // Creative X-Fi Xtreme Gamer Edition // Thermaltake ToughPower 700W // LG 23" @ 1920x1080
Indeed it does help. Can anyone tell me how to determine the cooling power in watts on my ac unit? Also I was reading that static pressure in the evaporator can vary depending on unit but still have the same btu rating. This means colder temps at the evap the higher the pressure? Could I just have a low pressure unit? It's filled with r22
just put the damn evap into so windshield washer fluid and call it a night
Hey finally put the evaporator in 1 gallon of fluid hit -8 Fahrenheit in an un insulated container. Time to step it up with a good cooler and more fluid now! BTW the condenser fan is sooo loud. It's in an L shape I was wondering could I take out the fan and motor and just make a grid of 120 mm case fans to place over the condenser to pull air through the coils? Or would it be no where near as effective. I'm just trying to quiet this beast down!
you can do that just make sure that they are pulled a little away from the condenser and that you make a good shroud so the sir is forced to come through the condenser . further more it would be best to use some decently high static pressure fans
these should work great and they are crazy cheap:
http://www.jab-tech.com/YATE-LOON-12...d-pr-3771.html
You sir are the man! Quick question though how far off the condenser should I mount them? And why not directly on it?
around 3/4" to 1 1/2"
if you mount the directly you will have dead spots
you need to make a shroud
kinda like this:
http://www.google.com/imgres?imgurl=...t:429,r:11,s:0
Haha if it weren't for forums I wouldnt even have come close to this far thanks man. BTW your chiller project is pretty sick haha
What refrigerant (Freon) is in the system?????
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????
R22
Here's a link with R22 & R12 Pressure/temperature (P/T) charts. If you know the temperature ,you know the pressure and If you know the pressure you know the temperature. Using R22 at -8F the pressre in the evap is 18 psig. See how pressure relates to temperature,look at the chart in the link.
http://www.longviewweb.com/pressure.htm
Ther are pdf files for other refrigerants on that page.....you may want to look over the other gases and save the pdf files.
Last edited by wdrzal; 08-10-2010 at 01:00 PM.
The Laws of Thermodynamics say:
Zeroth Law: "You must play the game."
First Law: "You can't win."
Second Law: "You can't break even."
Third Law: "You can't quit the game."
Do you wanna Play Thermodynamics ????????
thank you, it almost cost me my rig a few days ago...
make sure that you fully insulate several inches around anything you are cooling
I actually plan on submerging in a tank of mineral oil to prevent condensation. Only problem is mineral oil freezes at -30 celsius. But I think the components will throw off enough heat to overcome that if the fluid ever does get that low
well my setup hits -24c after around 3 hours and that is about 6 gallons of coolant.
I would just setup a thermostat to -25c and be happy
I'll be running probs around 16 gallons of coolant. And yea thermostat... how do I rig that up? What unit do I buy?
at the moment I don't that a thermostat, running it wide open, but I plan to scavenger a thermostat from a deep freeze and install it from there. Basically you just take the old one out and install the new one it's only 2 wires
to be honest you most like will not see temps as low as -30c even with no thermostat, but for the sake of saving on your electric bill I would run a thermostat so that the unit can cycle
Last edited by ericFX1984; 08-10-2010 at 07:58 PM.
Aha so could I buy any old thermostat from like lowes and hook up the temp probe from the stock system to it?
Posting Permissions
Reply With Quote
Bookmarks