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| + | scales as its needs grow. Oversized power supplies, power distribution units (PDU) and uninterruptible power supplies (UPS) tie up capital funds,cheap retro jordans, are inefficient and generate excess heat. Time Warner Cable has started using Liebert Corp.'s new NX modular UPS system, which scales in 20-kilowatt increments, to replace some of its older units. < p> | ||
| + | <p> "The question was how to go forward and rebuild your infrastructures when you have a limited amount of space," Azzaro says. < p> | ||
| + | <p> With the NX units, instead of setting up two large UPSs, he set up five modules -- three live and the other two on hot standby. That way, any two of the five modules could fail or be shut down for service and the system would still operate at 100% load. < p> | ||
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| + | <p> <b>Other approaches< b>< p> | ||
| + | <p> Some users are trying innovative approaches. One new way of approaching the power issue is a technique called combined heat and power, or cogeneration, which combines a generator with a specialized chiller that turns the exhausted waste heat into a source of chilled water. (See <b>related story< b>,cheap air jordan shoes.) < p> | ||
| + | <p> Another new approach is to build data centers that operate off DC rather than AC power. In a typical data center,cheap jordans for sale, the UPSs convert the AC power coming from the utility's main power supply into DC power,cheap-jordan, then back into AC again. Then the server power supplies again convert the power to DC for use within the server. < p> | ||
| + | <p> Each time the electricity is switched between AC and DC,cheap jordan shoes, some of that power is converted into heat. Converting the AC power to DC power just once,cheap jordans online, as it comes into the data center, eliminates that waste. Rackable Systems Inc. in<ul> | ||
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