Tev

[water_cooler 20]

I'm thinking of buying a TEV for my water chiller but i'm not sure if i should get the TEV or a cap tube.Also if i buy a R12 TEV but think about going R22 later will i have to buy a new TEV or use the same one.Also can a 1/6 R12 compressor work with R22.

And would a OX Orifice work for my setup.

[DaBit]

Originally posted by water_cooler 20
[B]I'm thinking of buying a TEV for my water chiller but i'm not sure if i should get the TEV or a cap tube.

TEV's cope better with load variation, and are easier to setup. With a captube you can reach a slightly lower temperature when setup correctly (and that is where the problem is).

Personally I love the Danfoss TUA range valves, much better than the T2 series. I don't have experience with any valves besides Danfoss. Sporlan seems to be quite good too.

Also if i buy a R12 TEV but think about going R22 later will i have to buy a new TEV or use the same one.

Then you will have to buy a new valve, or at least a new thermostatic element, if that is possible with the valve of your choice.

Also can a 1/6 R12 compressor work with R22.

Officially not. There is no guarantee that it won't blow. But in reality it usually works fine.

And would a OX Orifice work for my setup.

Orifice numbering differs from manufacturer to manufacturer, but you must get the smallest orifice available for that valve. Even that orifice is WAY oversized, but at least with the Danfoss TUA valve it works fine. With the Danfoss T2 valve I encountered slightly instable behaviour at really low loads.

[captaincascade]

tev? more often its called a txv

[DaBit]

Depends to whom you talk. TEV makes more sense IMHO; those things are still called Thermostatic Expansion Valves.

But who cares. TEV or TXV, either way I know what device is adressed.

[water_cooler 20]

i think i might just go with the cap tube this way i have more freon upgrade paths and save some money

Would this work good for a water chiller cap tube 026" ID x .072" OD x 12' from rparts

[water_cooler 20]

or would 031" ID x .083" OD x 10' be a better size

[DaBit]

That depends on refrigerant and load...
The capillary tube's length / I.D. must be matched to these two variables

[water_cooler 20]

the freon would be R12 and would cool water that will cool 1 226w tec and 2 80w tecs

[captaincascade]

im just bein a :banana::banana::banana::banana::banana: ,,,lol. sorry

[DaBit]

Originally posted by water_cooler 20
the freon would be R12 and would cool water that will cool 1 226w tec and 2 80w tecs

First of all, are you sure that you can obtain R12? It's banned since 1995 or so.

The load you are talking about is pretty high for a 1/6hp compressor. We are talking about 500W+ of heat.

With that compressor I hope you can keep water temperature at 20C .....

[DaBit]

Originally posted by captaincascade
im just bein a :banana::banana::banana::banana::banana: ,,,lol. sorry

Heheh, nevermind :)

[Gary Lloyd]

Cooling tecs with a phase change system is extremely inefficient. You will need a much larger system if you want to do it this way.

[water_cooler 20]

so i'm i better off just using one 226w tec for my cpu and using chilled water on the rest

[DaBit]

I even think that you are better off using no TEC at all. At if you definitely want to use a TEC, use it to subcool the refrigerant going to the evaporator.

[water_cooler 20]

would that give a big performance increse compard to it being on the cpu

[DaBit]

I guess so. It removes heat from the refrigerant, increasing the effectiveness of the evaporator and the amount of work done per mass unit of circulating refrigerant.

When put on the CPU, the compressor must get rid of the CPU heat, and the TEC heat.

[water_cooler 20]

i think i may just go with the TEC on the cpu alone and chilled water everywere else

[Gary Lloyd]

Another strategy might be to cool the returning water with an air cooled tec. The returning water would then go to the reservoir and be further cooled by the phase change system.

[water_cooler 20]

what would be a good size one to do that job.

[DaBit]

Personally I would leave the TEC altogether, or use it to subcool the refrigerant out of the condenser. This is definitely the best place for the TEC in a vapour compression based cooler.

When you are facing secondary coolant temperatures of -20C and lower, the TEC does hardly any work, so chilling the secondary coolant with the TEC is basically useless.

[water_cooler 20]

so i would lose temps my tecing my cpu

so to subcool it can i use a fan cooled tec look a 34w tec

[DaBit]

It all adds up. Use a heavier TEC, and see extra gain.

[water_cooler 20]

what if i just toss the whole tec idea and try to water cool my condenser would a DD heatercore beable to take out the heat

[DaBit]

An average air cooled condenser does a way better job than a heater core/radiator+watercooled condenser. It is simply the sum of the heat resistances, and with water as intermediate step, you have more heat resistances.

Now, a bong cooler + watercooled condenser would probably give you a small gain over an aircooled condenser.

[water_cooler 20]

ok then i just need a cap tube size i'm thinking about buying 13 feet of .26 captube and then trim it down

[water_cooler 20]

would 10 feet of .26 cap tube work as a base line for my cap tube sizing on my sys

[captaincascade]

guys this is a tev


lol no link! woops.

http://www.parker.com/cls/catalogs/625.pdf

[water_cooler 20]

in the begaining i wanted a TEV but i changed my mind and went for the cheaper soultion so i ordered a roll of 10 feet of .26 cap tube and wanted to know if this is a enoght it should be here on monday

[nyTroX]

Nice, Ive been meaning to try one or two out, thanks

[herefishy]

10' of .026" should be enough. I find that 12' of .028 suits me fine, for a single evap 150watt applciation.

[chris4521]

im gonna sound like an idiot here, and im sure someone's explained this before, but what the hell is a "tev"
lol
sorry :P