Comment Power managment (Score 1) 371
i think most people are missing the point of this
AC is good for long runs as you can step up and down the voltage very easily (with a transformer). doing this with DC involves turning it back into AC, changing the voltage with somthing like a transformer, then rectifing it back to DC
so of course a power company is going to use AC for long runs, by bieng able to change the voltage they can keep down the losses by going High voltage for country wide distrabution then switch it to somthing lower for suburb then lower and more useful for home usage
the reason to use DC in data centers is quite simple, you can deal with less power supplies and focus more on each one. i assume they would still use AC to get power to each rack then regulate it to DC for the entire rack. that way you can keep everything cooler (only one or two power supplies to keep cool, if placed at the top then you could use a 120mm fan or two to keep things a bit quiter) and each rack mount PC benifits because sudennly there isnt an AC power supply being cooled by a 40mm fan in the case so the CPU can run cooler.
in the enda PC needs DC. i would say this is more about power and heat managment than a AC vs DC slug fest. by reducing the amoun of power supplies and shuffling around of where the heat is generated you could reduce noise and heat.
AC is good for long runs as you can step up and down the voltage very easily (with a transformer). doing this with DC involves turning it back into AC, changing the voltage with somthing like a transformer, then rectifing it back to DC
so of course a power company is going to use AC for long runs, by bieng able to change the voltage they can keep down the losses by going High voltage for country wide distrabution then switch it to somthing lower for suburb then lower and more useful for home usage
the reason to use DC in data centers is quite simple, you can deal with less power supplies and focus more on each one. i assume they would still use AC to get power to each rack then regulate it to DC for the entire rack. that way you can keep everything cooler (only one or two power supplies to keep cool, if placed at the top then you could use a 120mm fan or two to keep things a bit quiter) and each rack mount PC benifits because sudennly there isnt an AC power supply being cooled by a 40mm fan in the case so the CPU can run cooler.
in the enda PC needs DC. i would say this is more about power and heat managment than a AC vs DC slug fest. by reducing the amoun of power supplies and shuffling around of where the heat is generated you could reduce noise and heat.
