Emerson 80-150kW White Paper download pdf (Page 11)

Regardless of the system used, an intelligent control system

that evaluates room load, room temperature (or supply air

temperature) and outdoor temperature must be employed

to determine the most optimal operation of system.

When considering total cost of ownership, the Liebert

DSE™ with Liebert EconoPhase™ system also compares

very favorably to alternative cooling systems. In order to

compare systems, a complete picture of system costs must

be known and compared. As shown in Figure 8, the Liebert

DSE can deliver a payback in less than three years compared

to traditional air-cooled DX systems, but without the

hassles and risks of other types of economizer systems.

Conclusion

As this brief has demonstrated, the Liebert DSE cooling

system from Emerson Network Power represents the

industry’s most exible, reliable and efcient DX solution.

The Liebert DSE achieves industry-leading efciency by

offering a modular, end-to-end cooling infrastructure,

complete with a high-efciency indoor CRAC unit, a

hassle-free pumped-refrigerant economizer, micro-channel

outdoor condensers with variable-speed fan technology

and a comprehensive data center intelligence and

management system built-in.

Collectively, these components make up a cooling

infrastructure capable of delivering the lowest possible

total cost of ownership and the highest levels of reliability

compared to competitive solutions – all backed by the

largest and most experienced sales and support team in the

data center industry.

Traditional

Air-Cooled DX

Chilled Water Chilled Water

Liebert DSE with

EconoPhase

Economizer None None Air Economizer Pumped Refrigerant

Energy Cost $416,000 $276,000 $251,000 $231,000

Water Cost $0 $32,000 $21,000 $0

Total Utility $416,000 $308,000 $272,000 $231,000

Annual Cooling PUE 1.32 1.21 1.19 1.16

Capital Cost $1,900,000

$2,200,000

$3,100,000 $2,500,000

Payback Base 4.9 years 5.6 years 2.7 years

15-Year PV $5,200,000 $4,900,000 $5,600,000 $4,100,000

Figure 8: Analysis of total cost of ownership across cooling system options, taking into consideration capital expenditure and operating

expenditure for a data center with a 1,500 kW load, $0.10/kWh utility cost and 40 degree dew point limit, based on Columbus, Ohio

weather data. The chilled water systems assume an entering water temperature of 50°F, with a water temperature difference of 12°F.

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Emerson 80-150kW White Paper Page 11

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