Bowmans Mod Shop

ok well been busy tonight.

this is what is going on tonight.

first i am checking the new triple manifold for leaks,running vacuum for 12 hours and them pressurize for 12 more.

i cannt stress how important it is to take the time to test every componant you can seperatly before you put the unit together.so many of my friends online rush to get it togther without taking the time to check every section.everyone should notice i build my stuff in sections to check it this way.any thats why i dont have near the trouble as some.

hees the manifold capped off and under vacuum

next i am working on a cover for the new evaperator i am putting on TheDudes prommie.
this pic you can see i have the basic cover done and installed 4 feet inside of the cover (this is to place even and strong pressure to the cpu without crushing the foam that the block will have to be filled with).

this is the cover as i start to make a mold of it.once the bottom mold is complete i will make a inside mold and then i should be able to pour the new covers quickly and more easily.

You are loving this just way too much Bowman. :D

Rock.

last but not least i have a small unit i am going to start on for a man who is building a custom pc from stratch.;)

Once again!.....I'm speechless!....:worship: :worship: :)

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Originally posted by bowman1964
last but not least i have a small unit i am going to start on for a man who is building a custom pc from stratch.;)

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are dents like that in the compressor ok?

mine has dents on the bottom right behind the screws that hold the compressor the the metal bottom plate. there not all the same shape so i was curious?

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Originally posted by Dissolved
are dents like that in the compressor ok?

mine has dents on the bottom right behind the screws that hold the compressor the the metal bottom plate. there not all the same shape so i was curious?

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mine is made that way from the factory,it is fine.most compressors have dimples or dents for a reason.

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Originally posted by bowman1964
mine is made that way from the factory,it is fine.most compressors have dimples or dents for a reason.

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ok thanks :)

Nice job btw on all your stuff its very interesting to see the pictures of your workshop, hope you can get some free time to relax soon :)

Uhhhh... in the new manifold, the large capillary needs to tie into the suction line above the liquid level or it defeats the purpose. The liquid refrigerant will drain out into the suction line while the system is off.

I wouldn't want to discourage you for anything, Bowman. Let's just say that it is not patentable (obsolete actually), but clever of you to come up with it. :D

Got a position for a retired service technician/author in the new Chipcon?

Bowman....

Awesome job on the new evap cover mold! I like the feet idea....should work great! :D

I love it here :D

It would be great if we could use one of those really big stainless steel coffee cup that is insulated by a vacuum and use it as an evap cover. I'm not sure how to get the suction line through it without breaking the vacuum.

It would look really good as well :D

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Originally posted by Gary Lloyd
Uhhhh... in the new manifold, the large capillary needs to tie into the suction line above the liquid level or it defeats the purpose. The liquid refrigerant will drain out into the suction line while the system is off.

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well i havent drilled the cap tube because of that.
2 things i am running though my head.
one if i run the large cap tube above the liquid line there is a possablity that oil will collect there and not drain.
if i run it like in the picture i will have to use a very well selected piece of cap tube that will not drain very well while running to allow it to fill with refrigerant and oil.then when unit it off the oil will drain out slowly.at startup the oil will go straight back to the compressor.i will try and post a small pic of what i am talking about later.

I haven't been able to find a picture of an accumulator online, but I will try to describe it for you:

The refrigerant coming back from the evap dumps into a large shell. Inside the shell is a U shaped tube. One end of the tube is open. The tube goes down to the bottom of the shell, then up to the top where the non-open end attaches to the suction line back to the compressor. In other words, the compressor is pulling vapor from the inside top of the shell through the U-shaped tube. At the bottom of the U is a small hole. When the compressor is running, liquid feeds very slowly into the vapor stream through that hole.

I hope that made sense.

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Originally posted by Gary Lloyd
I haven't been able to find a picture of an accumulator online, but I will try to describe it for you:

The refrigerant coming back from the evap dumps into a large shell. Inside the shell is a U shaped tube. One end of the tube is open. The tube goes down to the bottom of the shell, then up to the top where the non-open end attaches to the suction line back to the compressor. In other words, the compressor is pulling vapor from the inside top of the shell through the U-shaped tube. At the bottom of the U is a small hole. When the compressor is running, liquid feeds very slowly into the vapor stream through that hole.

I hope that made sense.

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although i did know that and they are easy to build but.....the problem with running the tube like that on my manifold is...

for that to work properly you need a certain amount of flow moving by the tube so it will pull a very slight vacuum though the tube,that is how a normal accumulor works.the fast moving gas creates a low pressure area at the mouth of the feed tube creating the small vacuum needed to pull the liquid up and out.but on the manifold i have it will not have enough flow because of the size of the tube,not giving it enough flow to create a usable vacuum.
this is why i am leaning towards a small piece of cap tubing in the bottom that will constantly drain small amounts of oil and refrigerant while it is running and completly drain when unit it off.

o and for everyone who would like to see a accumulator here is a small pic of a accumulator with a cooler built in.

Okay then, using your design allows liquid to drain by gravity into the suction line during the off cycle. If the suction line then goes back upwards that liquid will be trapped, much like the suction line dip in the prommie.

One more U turn and you've got it. :D

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Originally posted by Gary Lloyd
Okay then, using your design allows liquid to drain by gravity into the suction line during the off cycle. If the suction line then goes back upwards that liquid will be trapped, much like the suction line dip in the prommie.

One more U turn and you've got it. :D

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Yes you are right.:D
but i have reduced the return hose leaving the manifold to a size i think will not cause a restriction but keep the gas speed up enough to pull the oil in the hose back like normal....I hope.

What's the ID on the hose?

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Originally posted by Gary Lloyd
What's the ID on the hose?

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Flex hose is 1/2"id but it wont make alot of differance since the compressor i will be testing it on is only setup for 3/8 id tube.so the smallest opening in the return line will determain the amount of flow.it will be faster than straight 3/8" all the way but not by much.

Amount of mass flow is equal at all points in the system, and is determined by the system's choke point (the cap tubes).

Velocity of flow varies with the ID at any given point.

Based on experience, I would go with 3/8 ID, especially if it is going uphill. The 1/2 ID may not have enough velocity to carry the oil upwards.

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Originally posted by Gary Lloyd
Amount of mass flow is equal at all points in the system, and is determined by the system's choke point (the cap tubes).

Velocity of flow varies with the ID at any given point.

Based on experience, I would go with 3/8 ID, especially if it is going uphill. The 1/2 ID may not have enough velocity to carry the oil upwards.

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Funny you should say that......
i was worried about a possablity of that happening.so i am making the system with the 1/2 hose runnning from the manifold which will be 2 ft above the compressor running down to the connection which is 3/8 id tube at the condersor assem.so in any case it should be fine i hope.
thats another reason for the upper accumalor is the evaperators will be above the condensor assm and i knew everything would run down to the compressor too fast for my liking.
so i sat down and came up with the manifold with accumulator to help stop that problem..

Sounds like you have the situation well under control. :D

Hey Bowman, I still dont understand how you run three capillaries off one compressor. I thought it was only safe to run one??

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Originally posted by JToolz
Hey Bowman, I still dont understand how you run three capillaries off one compressor. I thought it was only safe to run one??

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you can run as many as you like as long as you can tune it to work.it just makes it more complicated to make work by a factor of 5...

for every cap tube you run you increase the load on the compressor.and increase the tuning needed.

all you are doing it increasing the refrigerant flow to the evap and increasing the load to the compressor and condensor.it is not to be tried by anyone unless you are pretty good with a single cap tube and have worked on quite a few,because i dont think it is possable to put one together without having to trouble shoot it.

it isnt like a single cap tube where you can follow a book and put it together,multiples act like a family.today thay get along tommorow they are fighting.there is constant tunning needed sometimes.lot of trouble,

i am mad right now....:mad:

another new unit( a brand new MACH II )is broken from shipping.i am not going to say much but show a pic where they all are breaking at so far,that i have personally seen.