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  1. Yeti

    seriuos cooling systems

    What you're describing is a vapor compression cycle aka phase-change cooling. It is a method of active cooling (TEC/peltier would be another) that can produce sub-ambient temperatures. Passive cooling methods (heat sink, heat pipe, water cooling) are limited to the ambient air temperature. You...
  2. Yeti

    Finally going for a custom loop

    It is most likely the the difference in fans. You can see from both tests that the fan speed, and hence the flow rate of air, drastically changes the performance in terms of the thermal resistance (C/W). The fan's Martin's Liquid Lab used are rated at 66.6 cfm, the best I can tell. The different...
  3. Yeti

    Finally going for a custom loop

    Yes, 'steady state' - you can look it up in any heat transfer textbook. So to be clear, by saying that "it will have a uniform temperature throughout" and "everything in the loop will be the same temperature," are you implying that the water exiting the cpu block is the same temperature as the...
  4. Yeti

    Finally going for a custom loop

    It is not an isolated system as there is heat being generated. Heat transfer deals with heat flows and temperature differences. As I already said each component will have its steady state (a much better term than equilibrium) entrance and exit temperature given a specific heat load.
  5. Yeti

    Finally going for a custom loop

    Please define it if you think it is such a clear term.
  6. Yeti

    Finally going for a custom loop

    It won't come to thermal equilibrium (which is a fairly murky term to begin with), it will reach steady state at which point each component will have a constant fluid entrance and exit temperature, assuming, of course, that the computer components are generating a constant amount of heat.
  7. Yeti

    Any battery backup for router only ??

    Your options: 1) Buy a normal (e.g. 120V AC APC) UPS - expensive, waste of an inverter 2) Buy a 12V DC UPS - would need to find one that fits your needs (current, socket) 3) Build a 12V DC supply (just google DIY 12V backup*) - requires some thought/skill 4) Generator - overkill, waste of...
  8. Yeti

    Electrical Grounding

    I'm not sure how you are coming to that conclusion. Typically the humidity has the largest effect though dissipation of a static charge because of the increased electrical conductivity of humid air (a similar effect would be realized with high ion concentration in the air). In cold climates the...
  9. Yeti

    Thoughts on freon and liquid cooling ...

    Mismatched thermal expansion coefficients or thermal shock, though very unlikely, could damage a board as well as increased brittleness with any internal stresses. There is also a possibility of a motherboard "cold bug" at very low temperatures. However, the motherboard really shouldn't be...
  10. Yeti

    Thoughts on freon and liquid cooling ...

    Yeah, I've followed that site off-and-on for many years. A lot of incredible systems on there including that 5 stage cascade. Yes, you need to protect against condensation. There are two goals to this: 1) insulating any cold (or potentially cold, e.g. think of conduction paths) to make surface...
  11. Yeti

    Thoughts on freon and liquid cooling ...

    No, I'm an engineer and I work on things much colder than HVAC systems ;).
  12. Yeti

    Thoughts on freon and liquid cooling ...

    Even if that is the case, that doesn't necessarily mean much. And that question has been answered: As with all sub-ambient cooling, condensation must be accounted for. Otherwise, it is doubtful that any other thermal issues would arise. As opposed to the non-cold kind? So him having R134a...
  13. Yeti

    Thoughts on freon and liquid cooling ...

    I would argue that "freon" (still not sure which refrigerant you're referring to) is relatively easy to acquire. What you're planning to do with it is the question. Are you saying that phase change and "freon" cooling are different?
  14. Yeti

    Thoughts on freon and liquid cooling ...

    CFCs such as R12 and R22 haven't been used commercially for a while. Their HFC replacements, such as R134a, are most common now. "Freon" is really a trademark of DuPont and their refrigerants, but people often use it as a synonym for "refrigerant" similar to Kleenex and "facial tissue". What...
  15. Yeti

    Nitrogen cooling

    Yes, I think most people know that it is possible to run an overclocked computer cooled with LN2. Continously cooling the computer to cryogenic temperatures, as the OP wanted (sort of, -80C isn't cryogenic, but proper LN2 cooling should get you well below -80C), would just be horribly...
  16. Yeti

    Nitrogen cooling

    A commercially built system made for a PC? No. A commercially built system that could be fitted to a PC? Yes, with several options. On a budget of $1500? No, none that I know of.
  17. Yeti

    Which liquid is good and efficient for Cooling?

    Is there something better? Sure - a closed cycle Linde-Hampson cooler providing liquid nitrogen, a cascade chiller pumping MultiTherm ULT-170, an electromagnetically pumped loop of Galinstan, or one of the various types of heat pipes. On a cost basis, though, water is an excellent heat transfer...
  18. Yeti

    Painting the Tower

    Was it really that hard to understand? :rolleyes:
  19. Yeti

    Painting the Tower

    First off, as ScottALot alluded to, black absorbs light in the visible spectrum whereas white will reflect visible light. Infrared radiation, on the other had, which I believe you're refering to as heat, is often equally absorbed (and emitted due to Kirchoff's law) by both white and black...
  20. Yeti

    Can someone explain how amps work in a psu?

    It actually is about watts at each given voltage "rail" (12V, 5V, and 3.3V), but it's common to just use the amperage rating for the rail instead. It doesn't matter since power (watts) is amperage times voltage, so saying you need 30 amps on your 12V rail is the same as saying you need 360W on...
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