Benching System (Converted Experimental SS)

[_HL4E_HalfLife_]

I started a new thread for this benching system since i have completely rebuilt it from that experimental SS i tried.

Some of the stuff is the same but ill post it anyways.
If anyone can find some specs on the LG compressor please post it! I looked and couldn't find any even on the LG website.

Main System:
Compressor - 1/2hp 6000Btu Rotary
Cap tube - 3.5m 0.031
Condensor - 8"x4"x2"
Evap - End cap design
Fans - 2 80mm Tt,1 90mm Panaflo@12v
Gas - 290 (Co2 will be added at a later date)
Pressures - 10-20hg vacuum/ 120-150psi Discharge

Secondary Support System (HX Sub)
Compressor - LG MA53LACM
Cap tube - 1.5m 0.031
Condensor - 6.2"x3"x0.5"
Evap - HX 4feet of 3/16 inside of 3/8
Fans - 2 80mm@12v
Gas - 290
Pressures - 5-15psi Suction/Discharge Unknown

I still have a few more tweaks and fine tuning to do to it and i can't take a temp reading untill my new UEI probe comes in but my other thermometers hit the -50c mark pretty quick.

[Skywayman]

Looks very nice, looking forward to seeing some temps

[_HL4E_HalfLife_]

Its been a while since i've updated because im still waiting for my replacement UEI thermometer. I've added some mobo mounting screws and i used soft solder to greatly improve the subcooling from the suction line to the cap tube.

[SexyMF]

Looks great. Electrically speaking have you earthed everything?

[Jort]

solid suction line? mhh hope it will work out ;)

[expansionvalve]

that capacitors bearing its teeth...
insulate...

[_HL4E_HalfLife_]

I finally got my replacement thermometer and i had it upgraded to a DT200 for and extra $20 Cad.

Ok heres the first results of my benching system with 290 and a small amount of Co2. T1 is the Evap temp, T2 was the temp taken from the suction line a few inches away. These temps were taken WITHOUT the 2nd compressor turned on! In the pic it looks like the suction presure is 29"hg but thats just the angle the pic was taken at the real suction pressure was about 25-26"hg

There's still a few thing i need to change that should increase the evap temps further.

[yngndrw]

Cool(Yay pun) temps mate. :D

Just wondering how you've hooked up the second compressor. Is it like a Cascade but with single stage gasses in the second stage ?

[_HL4E_HalfLife_]

Cool(Yay pun) temps mate. :D

Just wondering how you've hooked up the second compressor. Is it like a Cascade but with single stage gasses in the second stage ?

The 2nd compressor chills a 4foot HX that the gas from the 1st stage runs through after the condensor, but for some reason the suction on the main system is lower with the 2nd compressor off than with it on and i dono why :confused: :confused: Can someone enlighten me on why its doing this?

[_HL4E_HalfLife_]

Just finished doing some tweaking to the system and all i can say is :banana: :banana: :eek:

Now these temps are being reached with the main system only no 2nd compressor help of any kind.

Ps. Sry for the bad pic quality this time the flash is to blame lol.

[pythagoras]

My guess would be that as the first stage refrigerant is being cooled by the 2nd compressor its more efficient at removing the heat from a small cpu evap than with the 2nd compressor off so the suction pressure is higher. I'll wager the cpu temp is lower though;)

Regards

John.

[Waus-mod]

great! now lets see what load it could handle :D

[_HL4E_HalfLife_]

Improved again:D :cool:

[yngndrw]

Awesome, now let's see it loaded. ;)

[SunTzu69]

Very sweet. Congrats man.

:toast:

[Ad Rock]

Being a fellow Canadian and knowing that I am also limited to r290 and I guess CO2 I would also REALLY like to see some loaded temps.

[Eradicator]

Shouldnt this be considered borderline cascade and not Single stage? None the less looking forward to seeing some results.. Good luck...

[jinu117]

(chanting) load temp load temp (/chanting)
That is very long cap tubing from what I know of load conditions. But than maybe propane likes longer cap tubing than R404a, R402a, R507 variant. But than if secondary system just subcooling the refrigerant, it might be better suited for this experiment you are doing. Looking forward to end result. Been working on something similar using just one compressor on my end... (waiting for gases this time). Those rotaries do pull deep vacuum for sure.

[_HL4E_HalfLife_]

(chanting) load temp load temp (/chanting)
That is very long cap tubing from what I know of load conditions. But than maybe propane likes longer cap tubing than R404a, R402a, R507 variant. But than if secondary system just subcooling the refrigerant, it might be better suited for this experiment you are doing. Looking forward to end result. Been working on something similar using just one compressor on my end... (waiting for gases this time). Those rotaries do pull deep vacuum for sure.

I havn't been running the 2nd compressor to get these temps, These temps are being made by the 6000btu Rotary alone.

[_HL4E_HalfLife_]

Shouldnt this be considered borderline cascade and not Single stage? None the less looking forward to seeing some results.. Good luck...

Without the 2nd compressor running its the same as a single stage system.

[johann]

My opinion is with 3.5m of 0.031 captube it wont be able to hold much load and will proppably fall over when load is applied. I think propane actually likes it a little shorter than normal so I would say 2.6 -2.8m would be better.

You wont see that wow idle temp but at least it will work. As it is now I dont believe it will hold any kind of load.

For me I dont charge without load, its a waste of time as charging for the best idle temps is useless really.



Thats my 2 cents, I may be wrong! :D . Good luck I hope it works out, seems a great experiment.

[_HL4E_HalfLife_]

I know its been a while since i updated this thread but i've been doing other things lately.

I know no load temps arn't very important but its still eye candy to see how low a single stage can go so heres an updated eye candy pic of a new low temp :D :D :banana: :banana:

[jinu117]

We will see about cap tubing length... shortening is hell lot easier than lengthening anyways :)

[boardy]

Load it up dammit :D I wanna see if it works, then decide whether to use 1 of my rotaries for a bench S/S lol.

Boardy

[_HL4E_HalfLife_]

Load it up dammit :D I wanna see if it works, then decide whether to use 1 of my rotaries for a bench S/S lol.

Boardy

I would if i had something to load it with but the only thing i have is my p4 3.2NW but thats currently under several layers of insulation and is in use all the time, So unless someone can think of something else to use to load up the evap with? load temps will have to wait:( Sorry.

Ps. I don't have any power resistors either.

[_HL4E_HalfLife_]

Well no load temps are even better this time.:D

As for putting a load on it i.ve been looking around seeing if theres anything i can modify or build into a load tester and i thought of something that would work but lol i had thrown it out last spring cleanup :(

[the_new_guy]

try using a cloth iron as a load tester.

cool temps,

[Slayer2k3]

Sick benching rig man, but, I think you should run to your local home improvement store, and pick up some more......heavy duty casters. :p

And I like the idea of using a household wall switch to turn it on and off. :banana:

[Sub zero]

Come on stop teasing us we need to see some loaded temps:stick:

[GuuZ]

idd... I'm also wondering what it'll do loaded. The slight amount of CO2 causes the low temps but I'm wondering if that's able to hold some load

[aasmaukr]

Get a 172W TEC to load test it, you can get it @ ebay.

[krullet]

nice temps

[_HL4E_HalfLife_]

try using a cloth iron as a load tester.

cool temps,

Just how would i do that? An iron has a large heating surface much larger than the evap and im sure it puts out way more than 150w. It wouldn't be very reliable i don't think. Also how the heck would you mount it to the evap lol???

[the_new_guy]

i iron puts out about 1000 watts at highest setting,

use a variac or a fan regulator to reduce voltage to the iron

eg my iron is 1000w at 240v
so resistance is= v^2/p=240*240/1000=57.6 ohm

v=(p*r)^(1/2)

so put your desired value of p and we have calculated r = 57 .6

v=(200*57.6)^(1/2)=107v

so with the variac or regulator give the iron 107v and you have got ur self a heat load.

[jinu117]

Yeah... calculations are always nice... but only trust what you read really :)
resistance itself changes with temperature. I suggest grabbing small copper block like I did, put heat cartridge in it and just insulate around and use variacs to control heat output and be done with it. You can even drill small hole for probe to push in which gives pretty good idea how effective is your block at heat removal. One thing... never leave it on unattended... I've burnt through several enclosures when tuning wasn't done properly... firehazard...

[_HL4E_HalfLife_]

Yeah... calculations are always nice... but only trust what you read really :)
resistance itself changes with temperature. I suggest grabbing small copper block like I did, put heat cartridge in it and just insulate around and use variacs to control heat output and be done with it. You can even drill small hole for probe to push in which gives pretty good idea how effective is your block at heat removal. One thing... never leave it on unattended... I've burnt through several enclosures when tuning wasn't done properly... firehazard...

What the heck is a heat cartridge???:confused: :confused:

[jinu117]

http://www.sisweb.com/ms/sis/cartheat.htm
something like this. Basically circular heater that is small can put out quite a bit of heat :P
I use 250w or 200w one myself and use variacs to turn it down.
Basically I use copper block (2x2x1/2") drill hole for size of heat cartridge. use some artic cermaique over it, shove it in, drill small hole between cartridge and surface to put probe in (again ceramique), insulate the whole thing other than one surface, and mount it just like I would on computer. Gives very accurate reading of what you can expect in heatspreader layer and how well evap actually is cooling other than evap temp.

There should be a pic of my load tester... somewhere... if not... I could post one up.

[lma01]

There should be a pic of my load tester... somewhere... if not... I could post one up.

In your sig...
Btw, nice job, very good idea

[epion2985]

what can I buy to regulate the voltage to the heater core?

[jinu117]

what can I buy to regulate the voltage to the heater core?

http://www.allelectronics.com/cgi-bin/category/805/Variacs.html

probably cheapest you can find. 3 amp obviously more than suffice.

place has nice stuff for cheap (surplus electronic store). used to have local store mile away from my home until they closed it down... -_-; I hate paying shipping to these guys now lol.

[epion2985]

thanks

[the_new_guy]

you can also use a 600w light dimmer,

they use mosfets to regulate the mean voltage, might be a little bit cheaper.

[epion2985]

good point. I will drop by the hardware store later today and pick one up

[_HL4E_HalfLife_]

you can also use a 600w light dimmer,

they use mosfets to regulate the mean voltage, might be a little bit cheaper.

Thats what i use to vary the speed on motors. I'd post a pic of it but im not at home at the moment.