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Now that I have almost all parts for my first direct die, it's time to start realy thinking about the rigth length for cap tube.
I'm gona use R290 and 1/5 HP compressor(If I cant find anything better). Cap tube that I have is 0.031 inch and I calculated that I would need 3.8m of it for roughly 165w of heat. Does this seem correct? I'm pretty sure that my CPU won't produce that much heat but I used that wattage just as a some starting point for my calculations.
I calculate 153.6" for 165w with 0.031 cap. That is 3.9m. Using Gary's instructions here So sounds like you got it down.
you using BBQ R290
Well either BBQ grade or the one used in fork lifts as fuel...Not sure yet wich one. What kind of connector does a r134a botles have? Is it like a shraeder valve or is it like in normal gas botles? Im pretty sure I can braze an adapter if I need to tough...
Quote:
Originally posted by hatemi
Well either BBQ grade or the one used in fork lifts as fuel...Not sure yet wich one. What kind of connector does a r134a botles have? Is it like a shraeder valve or is it like in normal gas botles? Im pretty sure I can braze an adapter if I need to tough...
I think you have the same bottles in Finland as we have here? Do you BBQ grade Propane have the name Gasol there? I took a brass connection and brazed a schrader into it, works really great :). I have pic if you want. Btw, the BBQ and the ones used in fork lifts, i think they are the same.
The BBQ gases has inpurities in them. The odor, some butane( les than 2% acording to AGA) and there might be some other inpurities aswell. The fuel propane does not have the odor in them but the botles also have slightly different connectors:( I was also planing on brazing a shraeder valve on a gas botle valve to connect it to the gauges.
Here is a picture of the differnt connectors in torch botles that I can get ahold of and in BBQ botles:
The Pic of the valve you used would be nice to see tough:)
Both will have a certain amount of impurities. I don't know how much, it would depend on how well they refine it in your area. I know in Canada where I am BBQ propane has methane, butane, isobutane, propene and all kinds of other crap in it. Other than the methane, I wouldn't be worried too much about the other impurities, although they do add to the overall flamability of the gas. I'm sure they are trace amounts anyhow. You should check into getting some refrigerant grade propane, it may be possible without a licsence. I don't know for sure, I've never come across R290 down here. I know that in the northern part of my province they use propane almost exclusively for a refrigerant. In the cottages and stuff.
Looking at the pictures you showed, it looks like the torch valve would be easier to modify anyway.
I think the torch botles are the ones that I'm going to use as I can get ahold of it easily (Im pretty sure I can borrow some at my dads firm) and I can get the valves there too... butane(R600) doesn't consern me in the system even tough it might slightly affect the overall preformace of the system. Now I need to go to the AC guy and ask him if I could borrow his servicing station( not sure if it's the correct term) for maybe next weekend and try to get the system filled:) I still need another 2m of cap tube, litle oil and a shreder valve but other than that my system seems to be rady for assemby... And I need to borrow a propper A/O torch too. I actually found one shop that sells very small A/O torc and botles kits for 200€ but with 20€ that I have for the end of this month I just can't afford one:(
Here's a list of the impurities in Gasol (bbq grade propane in sweden) : http://www.airliquide.se/en/business...blad/gasol.pdf
(Hope you know some swedish, if not just look at "2", there it says :))
hatemi: im going to take som pics of my connection in a few mins (when it stops raining).
im using bbq grade R290 and i god to -43 C using it at just under 0PSI LOW for a chillier
i think that i can get good temps better that r134a by far maybe equal to r22 which i think is ok for a refrigerant that doenst require a license and is cheap as chips.
in about a month i will have completed my first direct die phase system
Thanks Pandrone.Im going to look for the same table from AGA site but if memory serves it said it was 98% pure propane. My swedish is not that good( barely passing the courses has been good enough for me;) ) even tough it is demanditory subject in finnish schools from seventh grade, but I got the main points from the PDF nonetheless:)
Just to let you know:165 watts is alot less than a high clocked A64 or preshott puts out...
Yup. But it will be enough for my northwood tough:) And I'm still planing my system so I can still easily change the captube length.
I found out that the AGA liquidgas ie. propane contains aprox 98% of pure propane and 2% of butane so it is pure enough for me:)
PS. Pandrone, it rains (more like poors)here too. Few hours ago the thunder was right above me but I cant her the banging anymore tough.maybe if I turned the volume down;)...
Northwood puts out a lot more then any of the A64/FX chips though. How do people come up with these heat estimates anyway? Take the manufactor's numbers and double them ? :)
Damn, this took a long time (didn't find any upload service). Anyway, here's the pics :
The schradervalve is brazed onto a gas-connection that you can buy at your local a/c shop:
http://upl.silentwhisper.net/uplfold...n_schrader.JPG
This is the propanebottle i use with it's regulator (that gives out 30mbar) :
http://upl.silentwhisper.net/uplfold...opane_tank.JPG
Just a pic to show where i connect those two (i'm lazy so you get a pic showing the bbq grill too :D):
http://upl.silentwhisper.net/uplfold...ll_fitting.JPG
And the last pic is showing the thingy in use (poor quality pic) :
http://upl.silentwhisper.net/uplfold...oad6/ready.JPG
Thanks Pandrone:) Now I get the idea on how to connect the botle to the gauges.
BTW i noticed your grill has warnings in finnish too;)
Pandrone what percent solder did you use to braze copper to brass
I think it was 40% silver the one used there. (the rods wasnt labeled in the store, more than the name silversolder).Quote:
Originally posted by kayl
Pandrone what percent solder did you use to braze copper to brass
Did you have to remove the regulator on the propane, or can you just feed into the low side and have the compressor pressurize it?
Vacuum the system that's getting filled, let the system fill itself to 1bar. And then start the compressor and let it suck the gas from the lowside acess port. So the answer is yes, i have the regulator left when filling :).Quote:
Originally posted by saratoga
Did you have to remove the regulator on the propane, or can you just feed into the low side and have the compressor pressurize it?
Thats what i assumed, just don't want to make mistakes with propane :)
Plans tend to change and this is my curent :
Got Danfoss sc10d compressor(R22 HBP) so the 1/5hp Aspera got ditched:) 1/2 vs 1/5hp so easy desicion. I needed a flashlight and some serious stealth skills to get this compressor;)
The whole system is mounted on a fiberboard and brazed together. All I need to braze now is drier and evap/hose and it's ready for some R290. Im not pleased on my evap tough...Melted the cap when brazing so I made hole on the top of my evap and brazed the cap there, but now I can't run it inside the suctionhose (automotive hose made from rubber so wrapping it around it won't help that much). I might still change the evap so I can run it inside the suctionhose for better effiency, but for now I cant do so because My neighbours O/A torch run out of oxygen:( The service tech that is going to help me fill the system has small A/O setup so I can change the captube before putting all together.
I decided to go for 2.4m of 0.031 for 210w load. I will post pics as soon I get everything ready:)
You do that mate, really looking forward to seeing this (making a propane system myself) :)Quote:
Originally posted by hatemi
I decided to go for 2.4m of 0.031 for 210w load. I will post pics as soon I get everything ready:)
I can post some pics of the system on the back of my ex(yes she is so grate!) GF's car, but they aren't so grate... I take care of her dog and I can drive her car for 5 days! Tomorrow I will discuss the proper way of filling the comp with my AC tech...I sure hope he borrows me the gauges and vacume pump for a couple of days since I know he can't get the charge right...CPU does have a different load as a refridgerator! and you can't charge one from a PDF from Danfoss or Electrolux! trial and error...All It really takes...and more trial