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  1. Thread: My computer

    by star882
    Replies
    6
    Views
    642

    Does your kernel support SMP? You might be using...

    Does your kernel support SMP? You might be using only one of your two CPUs if it doesn't. Also type "free" into the terminal (on both PCs) and tell me what it reports. If it's using lots of swap, it...
  2. Replies
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    2,054

    Also try drinking cold water. It takes *about*...

    Also try drinking cold water. It takes *about* one calorie to raise one gram of water one degree C.
    If you want, you could even make a water cooler that uses an open drive compressor driven from an...
  3. Let's start a boycott... Let's use wireless cards...

    Let's start a boycott... Let's use wireless cards with high gain antennas attached to them...
  4. Replies
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    2,913

    http://www.xtremesystems.org/forums/member.php?u=3...

    http://www.xtremesystems.org/forums/member.php?u=3031
  5. Replies
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    427

    Hasn't satellite internet existed for a long...

    Hasn't satellite internet existed for a long time? You can get satellite internet as long as there's a view of the sky. There's even an electronic dish that will automatically realign in a moving...
  6. Replies
    30
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    2,344

    I just came across that information while...

    I just came across that information while researching how to build a phase change CPU cooler.
    BTW, putting refrigerant into a metal block attached to the CPU is called DD (Direct Die). When a liquid...
  7. Replies
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    2,344

    I actually work on Britney "mini supercomputers"....

    I actually work on Britney "mini supercomputers". If you haven't experienced it, 15GigaFLOPS is very fast. (To give you an idea, that's about 2 to 4 times the speed of an Athlon 64 at the same clock...
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    2,344

    I don't know the exact figures but a 3.6GHz...

    I don't know the exact figures but a 3.6GHz Britney is more than powerful enough to emulate an earthworm brain. (Earthworms have very simple brains, as do spiders. I recall a figure that a spider...
  9. Replies
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    2,344

    Used properly, 15GigaFLOPS (up to 3TeraFLOPS if...

    Used properly, 15GigaFLOPS (up to 3TeraFLOPS if internal FPGA can optimally coprocess the data) is some pretty serious power for audio DSP. In fact, 15GFLOPS is actually very fast for video DSP......
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    857

    You could have a pro rewire the controls so the...

    You could have a pro rewire the controls so the heat strips will not turn on unless the thermostat is turned to emergency heat or if the room temperature is very low.
  11. Replies
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    652

    Trinitrons that can do 1080p have been around for...

    Trinitrons that can do 1080p have been around for a long time. I have a 5 year old HP p1130 that could do 1440p (that's right - 1920x1440 progressive at 80Hz) without a problem. I still prefer a pair...
  12. Replies
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    4,286

    What are the operating pressures when fully...

    What are the operating pressures when fully warmed up? The LG unit I talked about has design high side pressure in excess of 500PSI. (I think it listed 630PSI but I'm not sure.) I'm pretty sure it...
  13. Replies
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    2,228

    Do you have a good torch? Beware that if you have...

    Do you have a good torch? Beware that if you have a high end brazing torch, it will probably be too hot for easy soldering, so try moving it to distribute the heat. Don't worry all that much if you...
  14. Replies
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    2,225

    Can you replace the amplifiers with digital ones...

    Can you replace the amplifiers with digital ones to reduce the load? Keep in mind that a digital amplifier is about 2 or 3 times as efficient as an analog amplifier.
  15. Replies
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    2,913

    No. You can make an account on that forum (or...

    No. You can make an account on that forum (or http://www.xtremesystems.org/forums/forumdisplay.php?f=80 ) and PM him for proof.
  16. Replies
    38
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    2,913

    Well, it doesn't take much to get 28" of vacuum....

    Well, it doesn't take much to get 28" of vacuum. (I'm sure the diaphragm vacuum pump used for automobile controls can do it.) Even an air compressor working in reverse can do it. But a humble...
  17. Replies
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    2,913

    Actually, you can buy a ball valve that has about...

    Actually, you can buy a ball valve that has about 6" of hose already attached. (Check your local supply shop. I know ACR sells those.) Attach that hose to the vacuum pump. And you can get a T fitting...
  18. Replies
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    2,913

    Pretty simple. The outer two gauge hoses connect...

    Pretty simple. The outer two gauge hoses connect to the system as usual. The middle hose, however, connects to an end of a T fitting. The other end of the T fitting attaches to the ball valve than to...
  19. Replies
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    2,913

    There will still be a small amount of air left in...

    There will still be a small amount of air left in the section where the nipple connects to the valves. In refrigeration, even a tiny amount is significant.
    Besides, with the T fitting and ball valve...
  20. Replies
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    2,913

    I usually pull a vacuum for about 4 hours three...

    I usually pull a vacuum for about 4 hours three times, so a total of 12 hours. The following link explains triple evacuation:...
  21. To be precise, they also use PAG and PAO for...

    To be precise, they also use PAG and PAO for R134a, but Ester oil (POE) is the most common for low temperature applications. PAG absorbs moisture extremely well (and breaks down with exposure to...
  22. Replies
    38
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    2,913

    Do they triple evacuate? How long do they pull a...

    Do they triple evacuate? How long do they pull a vacuum? What compressor do they use?
    Keep in mind that a compressor often works better than a typical aspirator (air powered) vacuum pump. Therefore,...
  23. Replies
    5
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    725

    Just a wild guess but maybe the mercury is used...

    Just a wild guess but maybe the mercury is used to protect the plumbing? I'm thinking the mercury might coat the pipes and form a protective layer and/or work as part of an electrochemical cell to...
  24. Replies
    16
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    4,286

    And I guess there's a condensing unit underneath...

    And I guess there's a condensing unit underneath just so you can say it's a heat pump.

    LG already makes one that uses a heat pump, and it does take a while to start up on a cold day. On average,...
  25. Replies
    10
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    1,149

    An inverter certainly is a great idea, but it's...

    An inverter certainly is a great idea, but it's not the only solution. You'll need some very careful design to make it vary as extreme as 1 to 4 tons. IIRC, an inverter can reduce capacity down to...
  26. Replies
    12
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    1,055

    But if there's a thermostat controlling the...

    But if there's a thermostat controlling the recirculator pump, the pump will initially pump cold water into the first tank, then sense the water heating up in the return pipe, at which point it...
  27. Replies
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    3,037

    No. The other person is Nikki, an embedded...

    No. The other person is Nikki, an embedded systems programmer.

    BTW, if anyone is curious about what happens if a refrigeration system breaks down in one of the Britney units while none of the...
  28. Replies
    41
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    3,037

    Since the club is only open to T.E.C. (technical...

    Since the club is only open to T.E.C. (technical education center) members, I'll be your messenger, so you can get information from the club (unless prohibited by NDA or club rules) and ask...
  29. Replies
    12
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    1,055

    If you're using a recirculator, connect the...

    If you're using a recirculator, connect the return between the tanks unless you're using an elaborate system with a return water temperature sensor, in which case it should connect to the first...
  30. Replies
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    3,037

    Looks can be deceiving... And my idea of fun is...

    Looks can be deceiving... And my idea of fun is to build/design/reverse engineer something... (But I know a lot more about electronics and computers than I know about mechanical and refrigeration...)...
  31. Replies
    41
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    3,037

    I'm still working on the CPU cooler (still...

    I'm still working on the CPU cooler (still working on control circuit). I got the condenser fan power supply working correctly, though. I'll see just how high I can get the clock speed...
    Well, it...
  32. Replies
    41
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    3,037

    That's why there's an oil separator (to catch...

    That's why there's an oil separator (to catch most oil at the compressor) and a firmware routine to ramp the compressor up to full speed every once in a while (to push trapped oil back into the...
  33. Replies
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    940

    I use IPCop (dedicated implementation of...

    I use IPCop (dedicated implementation of iptables) as a firewall. It runs on dedicated hardware, making it faster.
  34. Replies
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    3,037

    Actually, MOSFET-based (and IGBT-based) inverters...

    Actually, MOSFET-based (and IGBT-based) inverters are not that expensive. A typical high power MOSFET is only a few dollars each (6 needed for a 3 phase motor). Controller chips are also only a few...
  35. Replies
    6
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    1,331

    On something that old, it's about time to...

    On something that old, it's about time to upgrade. Just check for loose bolts and simple-to-fix problems, then just use it until it breaks.
  36. Replies
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    2,489

    Could it be the spark plug firing even after the...

    Could it be the spark plug firing even after the flame is lit? Maybe your furnace uses an old style high voltage transformer.
  37. Replies
    12
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    1,055

    It should be connected to circulate water through...

    It should be connected to circulate water through the first heater (heat pump w/ electric backup). The second heater (gas) only makes up for
    insufficient capacity.
  38. Replies
    41
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    3,037

    inverter drive compressor?

    Out of curiosity, why don't modern A/C units use inverter drive compressors? AFAIK, I'm only aware of one A/C unit (a high end Carrier Infinity?) that uses an inverter drive compressor. Many of the...
  39. Replies
    6
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    1,331

    I have seen this happen on a Brysch scroll...

    I have seen this happen on a Brysch scroll compressor used in a CPU cooler. What happens is that the magnet inside the compressor is shaking as it tries to "lock" onto the moving magnetic field from...
  40. Thread: Comcast sucks.

    by star882
    Replies
    14
    Views
    1,087

    Get DSL - satellite connections work anywhere...

    Get DSL - satellite connections work anywhere there is a view of the sky but have bad latency...
  41. Replies
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    996

    Have you thought about adding a unit that adds...

    Have you thought about adding a unit that adds some colloidal zinc/zinc dust to the water to coat the condenser with? The zinc will protect the copper. (They bolt zinc blocks to boats to protect the...
  42. Replies
    27
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    1,825

    Go to the bottom (or top, depending on setup) of...

    Go to the bottom (or top, depending on setup) of the screen. To the left should be an icon that looks like a K over a gear. That's the K menu.
    Once you have opened the Konsole, type "su" and enter...
  43. Replies
    9
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    2,051

    It can be done anywhere on the plumbing, but it's...

    It can be done anywhere on the plumbing, but it's usually done at the compressor. It generally takes at least an hour. A good company will let it run for 4 hours or more, maybe even overnight. The...
  44. Replies
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    4,286

    Maybe it's time for more manufacturers to make...

    Maybe it's time for more manufacturers to make ventless heat pump clothes dryers.
  45. Thread: What is TXV

    by star882
    Replies
    27
    Views
    3,002

    Actually, they would have to cut off the...

    Actually, they would have to cut off the capillary tubes and install a distributor, then braze it all together. But that shouldn't raise the price very much, if at all.
  46. Replies
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    1,349

    After recently losing a mechanical engineer to...

    After recently losing a mechanical engineer to breast cancer, I understand how sad it is to hear about the death of a person, even a person I did not know about until after her death. In honor of...
  47. Thread: Snake oil!

    by star882
    Replies
    22
    Views
    8,756

    Have you ever suggested to replace the existing...

    Have you ever suggested to replace the existing filter drier with an oversized one? I've heard that the ones that look like a bulge in the copper tube are not very good, but the ones that look like a...
  48. Replies
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    9,865

    Well, if Intel decides to use refrigerants to...

    [/quote]
    Well, if Intel decides to use refrigerants to keep the CPUs cool, they'll be up to 5GHz pretty easily. And keep in mind that with CPUs running as hot as they are, refrigerants might soon be...
  49. Replies
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    1,825

    You use a "terminal emulator", such as Konsole...

    You use a "terminal emulator", such as Konsole (start at the "K Menu", then the "System" submenu, and it should be there). You must run the commands as root for it to work.
    BTW, if you run "emerge...
  50. Thread: What is TXV

    by star882
    Replies
    27
    Views
    3,002

    Then show a picture above so I can see what, if...

    Then show a picture above so I can see what, if anything, is hiding behind that piece of sheet metal.
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