Packaged Unit

  • For safe and efficient data centre cooling

    Application description

    Cooling of IT equipment in data centres is an increasing challenge for operators and design engineers. Power management is the major challenge, with energy consumption and heat loads increasing in step with the server density. Meeting these challenges is essential for ensuring the safety and availability of the data. 

    Other important factors are:

    • Cost optimization: cooling can be up to 50% of the overall energy cost in a data centre 
    • Precise humidity control and better control of static electricity
    • Minimum start-up current for situations where the power grid is sensitive to load, reduced downtime, and increased lifetime of the overall system

    Why choose our variable speed compressors for process cooling?
    The first major benefit is the overall energy saving. 

    Other benefits include:

    • Flexibility with combined compressor and free cooling 
    • Quick and smooth adaptation to varying loads; Danfoss inverter technology modulates cooling between 25 and 100%, saving substantial amounts of energy, especially in part-load operation. Experience shows that savings of up to 50% can be achieved in energy consumption. This significantly reduces the PUE values (ratio of power supplied to the data centre divided by power consumed by the IT infrastructure) (see Figure 1).

     

  • Energy saving potential with variable speed
  • Figure 1: Potential energy saving in a packaged unit equipped with a single inverter compressor compared with a unit equipped with a fixed-speed compressor.

     

    • Actual energy efficiency improvements will vary depending on the data centre design and the configuration of the cooling systems. However, recent experience has shown that installing a VSH variable speed compressor solution into a unit previously using traditional On-Off compressors can reduce the annual energy consumption of the cooling unit by as much as 50%. Danfoss inverter scroll compressors are the most energy-efficient solutions available on the market today.
    • Stable and precise temperature control, with very consistent and stepless adaptation to required cooling load. Whatever the variation in ambient temperature or outside temperature, the system can maintain a set point temperature to within ±0.2°C thanks to the capacity modulation system (see below figures).
    • Reduced noise under partial load conditions facilitates the integration of the unit in the surrounding.
    • Reduced start-up current is an additional benefit with variable speed technologies, since the compressor rarely needs to start at full load, and since the Danfoss inverter has a very soft start with very low in-rush current. This benefit solves the problems that arise in areas where electric power is unstable, avoiding a peak in demand.

     

  • Temperature set point without variable speed
  • Temperature control with variable speed

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