-Some discussion on 110v vs 220v power. I have limited knowledge here, and would love a good paragraph or two on advantages, ease of implementation, pitfalls, etc.
-Phase 3 power discussion. A lot of the listings I looked at had this as a feature....I do not want to research this, and would rather pay a bounty for someone to sum it up with common English.
-AC cooling. For those of you working in enclosed spaces....I realize it is almost impossible to cool a sizable farm on AC alone without venting the waste heat. With venting, how much AC power would one need to properly cool a 15-20 GH/s installation? Square footage would be around 800.
THANKS!!!
Hi, heres the info. You requeted. I am a senior level mechanical and electrical engineering student . I can clarify or simplify any part at your request.
#1
Basically the power that comes into your house in an alternating current. This is opposed to a constant (Direct current) current that is found in batteries. This means the voltage found at your wall outlets goes form +120 to -120V at a rate of 60 times per second. \
Generally, to transfer power you need both a negative and a positive wire. But in a very specific situation, due to how power works, it is possible to completly eliminate the negative wires. To accomplish this, it is necessary that power is generated by three sources that a phase angle of 120* apart. After that criteria, if the load of each those generator is the same (balanced), the the negative wires can be completely removed. (If the load on these generators is not perfectly balanced, then another benefit is that the thickness of the negative wire can be greatly reduced.) This allows electircal utility companies to run 3 wires instead of 6 and is a huge cost savings. All of these three phases are available to your house.
To make what I said brief, the advantages of 3 phase power are mainly geared towards the electrical utility company as cost savings from wire reduction.
#2
Each of the three phases are available to a residential/commercial building. A schematic is show below.
Now what is not pictured in the schematic is the negative wire (since it is not needed). In our electrical setups we use the earth as a ground (negative wire).
Here are the mathematical results of the power combinations.
Phase 1 - Ground --> 120V (Also called 110V since it dips down as low as 110V, its not perfect)
Phase 1 - Phase 2 --> 240V (Also called 220V since each phases dips down as low as 110V)
Phase 1 - Phase 3 --> 208V
Basically nothing is designed to work on 208V. It is worthless to your application. It is a possible combination from the utility power transfer setup. **One exception. Some large motors are designed to work on a three phase source. This makes the motor operate smoother, but since this connection is not readily avialable it is restricted to large commercial machines with specialized connections.
Now here is something interesting for you.
Basically Volts * Amps = Power
Transferring more amps heats up the wire. This requires a large wire.
Transferring more volts does not affect the wire.
You can think of volts are pressure, and current as flow.
A larger pressure is nothing. Think of a compressed air tank. It just says constantly compressed.
But a flow of air causes friction. This larger your flow (amp), the more friction shows. This friction is lost as heat and seen as a loss in efficiency.
This means that the same gauge wire can transfer twice as much power on 220V. <-- This is what you want. Its more efficient and has more capacity.
#3
Easiest way to deal with the heat is to vent it to the atmosphere using a fan. Since you are not living in it so even if its on a 100*F summer day, a 100*F is nothing for computers. But if you need this environment has to be livable and do not have access to the atmosphere, this means a large air conditioning setup will be needed. But still a better method would be of transferring heat away (outside). If you cannot use air (simplet and cheapest). Then see if you can find an exit using water transfer. This will allow you the transfer away the heat, which will be stored in the water, before the generared heat has a chance to effect the inside too much greatly reducing the load. This could mean constantly running water down the drain from a heat exchanger, or better yet. Running this hot line outside to an evaporator.
If this helped and the bounty is available please send it too. If you need more help please post or PM me. I need me some bitlotto money. Maybe one day, ill win.
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