Auto-Cascade plan

These systems have only about 2 ozs in them and when we mod them, we have no real idea where the charge will land so the only way to charge is superheat, temperature and subcolling, The refrence to temperature at a specific ambient is to base line an unknown system to get you near the desired performance. Weight when measure into these systems is less than your hoses connected hold so it is nearly impossiable to weigh it in unless you have a pressure graduated cylinder and then temperature needs to be taken into account. As to pulling a vacume in 60 seconds that is impossiable with the portable equipment we use and a 60 second vacume on a system that has been previosly charged it will take a lot more time than 60 seconds.

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Originally posted by chilly1
As to pulling a vacume in 60 seconds that is impossiable with the portable equipment we use and a 60 second vacume on a system that has been previosly charged it will take a lot more time than 60 seconds.

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oh i know that. i just mentioned it because i thought it was amazing how quickly they could vacume and charge a system. its not a small group of people doing it. a multimillion dollar company does it.

Condensing unit is done just waiting for my stainless steel hoses to arrive.

http://www.vr-zone.com.sg/Shamino/dualevap/pics/3.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/4.JPG

Planning to put it behind a case:

http://www.vr-zone.com.sg/Shamino/dualevap/pics/12.JPG

Here's the evaporaotr for the GPU. I would have wanted to dimple the base but its only 3mm thick, from a spare copper plate I have.

http://www.vr-zone.com.sg/Shamino/dualevap/pics/5.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/6.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/7.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/8.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/9.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/10.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/11.JPG

Stainless Steel; hoses finally arrived.

http://www.vr-zone.com.sg/Shamino/dualevap/pics/14.JPG

GPU evap

http://www.vr-zone.com.sg/Shamino/dualevap/pics/15.JPG

CPU Evap:

http://www.vr-zone.com.sg/Shamino/dualevap/pics/16.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/17.JPG

Original cap tube that ran through suction hose is brazed shut somewhere in the brazing process so I had to drill a hole to fit in another cap tube. Not so sure how the refrigerant will flow now, hope it works ok.

http://www.vr-zone.com.sg/Shamino/dualevap/pics/18.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/19.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/20.JPG

http://www.vr-zone.com.sg/Shamino/dualevap/pics/21.JPG

Time to vaccuum :)

i love it

WOW!!

Lardarse you have really got the hang of this. Your mind picked it up so quickly. I just wish I could get a handle on it like you have.

Truely amazing!!:D

Heheh thx guys :D
I hope it works well, should at least give me -30+C loaded I hope :)
Problem is I ain't got heatload nor the hardware to test it out yet. :(

Congrats LardArse!!!

Can't wait to see the first resultts ... :D

well done love the evap design's too

Love the setup. I'm wondering how you finally decided to calculate the cap tube lenght for each evaperator?

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Originally posted by zabomb4163
oh i know that. i just mentioned it because i thought it was amazing how quickly they could vacume and charge a system. its not a small group of people doing it. a multimillion dollar company does it.

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Probably had huge vacume tanks with chilled percititors and cold traps.... like four or five 100hp vacume pumps.

GOOD JOB... cool design can't wait to see the loaded temps...

Hey Chilly,
Am dropping off a 190# toy at Overnite Freight dock tommorrow :D

C

cool... may be a few days till I can look at it.... I almost cut my finger clean off... it is also broke... cut 3/4 the way through my ring finger and broke th bone under the nail.... 10 days off....

wow chilly....
that's immensely SCARY!
Take Care!!!

C

Woah Chilly careful there! Don't lose your fingers before you get --150C :)

Need to shorten the CPU cap tube or lengthen the GPU cap tube it seems the GPU evap is getting the lion's share. I followed Chilly's cap tube reccomendation roughly but I've cut the cap tubes a few times so my tube length is a lil off.

http://www.vr-zone.com.sg/Shamino/dualevap/pics/22.JPG

Niow I do not know whether to shorten CPU cap tube or lengthen GPU cap tube, floodback occurs pretty fast from the GPU side. The CPU takes about a minute + longer to frost back.

Ouch... Having almost lost a finger to an ice machine auger, I know what you are going through, Chilly1. Take care of those fingers. You are going to need them. Be careful, take it easy, and get well soon.

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Niow I do not know whether to shorten CPU cap tube or lengthen GPU cap tube, floodback occurs pretty fast from the GPU side. The CPU takes about a minute + longer to frost back.

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Cap tubes are sized for a specific heat load. You can't tell if they are right or not until the evaps are fully loaded, not to mention insulated.

You do have the longer cap tube on the GPU evap, right?

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Originally posted by zabomb4163
I dont know if this sounds dumb. But do many people in your trade measure refrigerant using weight? My dad was a heat transfer engineer for 20 years and according to him in the industry the system is set on a system of precise scales and the refrigerant is filled according to weight.

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Someone at the factory has gone to a great deal of trouble to tweak a typical system using subcooling and superheat, etc., under tightly controlled conditions, in order to determine the ideal refrigerant charge (by weight). It is then printed on the label, so that all systems of that model can be easily and quickly charged, the assumption being that they are all identical. Of course, no two systems are exactly alike, but this gets the (mass produced) system in the ballpark, and it works, saving a great deal of time and money.

Tweaking is more accurate. :D

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Originally posted by Gary Lloyd
Cap tubes are sized for a specific heat load. You can't tell if they are right or not until the evaps are fully loaded, not to mention insulated.

You do have the longer cap tube on the GPU evap, right?

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Yes I do think so, but I've cut bits when testing after brazing so now its a bit of a ?. I've put in a bit extra to account for the cutting, I intended the GPU to have 0.2M of 0.026 longer, but I think now they're quite close in lengths. Think I'll shorten the CPU cap length.

im finishing my high school exams next week so soon ill be back in buisness

very nice system

i think the floodback occurs faster on the gpou evap as it works upside down

I went through a good deal of trouble to find the ideal static charge of the MachI and machII and this still only gets me in the ball park to where I can measure and tweak ...

Thats a very nice Cascade you have there Lardarse, and its a wee bit smaller than your other :D

Infact, that other cascade of yours is so bulky, huge, and takes alot of juice, you should probably just freight it to me overnight, i dont mind :D

The second system is not a cascade setup, it's a single stage dual evaperator system

Nice system. I didn't understand how a dual evap would work before this.

Anyone done a triple evap?