Reduced installation and running costs in chillers

Core component of the HVAC system, a chiller cools the water or brine used to cool and dehumidify air in buildings or industrial processes. It's a factory-assembled unit that cools the water or brine using an evaporator, and has an internal or a remote condenser with appropriate controls. The condenser can be either water-cooled or air-cooled. A chiller based on such a design has a variety of applications, from space cooling to process purposes. 

A typical modular chiller unit uses tandem fixed-speed compressors to provide some part-load capability for the modular system. These units share the same water system to provide cooled or heated water to the building.

Danfoss offers the option of using only one variable speed compressor instead of a fixed-speed tandem in order to better match the capacity requirement of the modular chiller unit.

Why choose Danfoss variable speed compressors for modular chillers?

For the end user:

  • Using the Danfoss inverter compressor solution, the unit will have much better seasonal energy efficiency, providing energy savings all year round. The energy saving potential in both heating and cooling modes is illustrated in the graph below as a function of ambient temperature:

For the OEM:

  • By using one inverter compressor, the design of the unit can be simplified to provide continuous capacity output over the full speed range. The manufacturer can provide flexible options to the end user such as:
    • Full variable speed solution, where all units use variable speed compressors to achieve the best efficiency and modulation.
    • A solution using a combination of variable-speed compressors with other fixed-speed compressor modules, allows a good improvement in energy efficiency whilst remaining cost competitive. 
  • Cost reductions can be achieved because fewer components may be needed, such as multiple fixed-speed compressors, relays, and pressure switches; the amount of piping required will also be less.
  • Modular chiller units using Danfoss variable speed compressor solutions also provide the opportunity for manufacturers to offer an alternative to VRF units.
  • VZH variable speed chiller designs also give manufacturers the opportunity to offer innovative and differentiated solutions which can improve product and brand image, instead of units using traditional on-off compressor technology.

What other benefits are there for your customers when they choose Danfoss inverter compressors?

  • Reduced installation costs: thanks to the more reactive adaptation to cooling demand, the manufacturer or the installer has the possibility of eliminating or downsizing buffer water tanks, with a significant cost saving and reduction in footprint
  • Lower sound level: under part-load conditions, especially during the night, chillers using a variable speed solution will have lower sound levels than traditional on-off compressor systems in both running and start-up periods
  • Short pay-back period: the pay-back period with this innovative technology can also be as little as 2 years for the end customer
  • Lower environmental impact: reduced impact on the environment with R410A refrigerant

The most important benefits for customers

  • Energy savings
  • Reduced installation costs 

Products

  • Turbocor® - TG - Danfoss
    Turbocor® - TG

    Danfoss Turbocor® model TG oil free compressors are available in four different models ranging from 40 tons to 150 tons / 140 kW to 540kW utilizing ultra-low GWP HFO1234ze.

  • Turbocor® - TT - Danfoss
    Turbocor® - TT

    Danfoss Turbocor® model TT oil free compressors are available in four different models ranging from 60 tons to 200 tons / 200 to 700 kW utilizing R134a or non-flammable, low GWP R513A. 

  • Turbocor® - VTT - Danfoss
    Turbocor® - VTT

    Danfoss Turbocor® model VTT oil free compressor is available with a capacity up to 400 tons / 1430 kW using R134a.  This compressor is designed for water and evaporative cooled chiller applications.

  • Inverter scrolls - VZH - Danfoss
    Inverter scrolls - VZH

    Danfoss inverter scroll compressor VZH offers effectiveness and reliability. Over 30% energy savings is possible in rooftops, chillers, close controls etc.

  • Danfoss VRJ inverter scroll compressor
    Inverter scrolls - VRJ

    Danfoss inverter scroll compressor solutions for commercial air conditioning and process-cooling applications. R410A, single units. VSH: first-generation commercial inverter scroll compressors with frequency converter CDS302. VZH: second-generation commercial inverter scroll compressors with frequency converter CDS303. VRJ: first high-tier residential inverter scroll compressors with frequency converter CDS801.

Case studies

  • Danfoss Turbocor® TG
    Oil-free centrifugal compressors: from R134a to R1234ze

    The Danfoss Turbocor® TG310 compressor is the first 60-90TR compressor introduced with R1234ze refrigerant, a refrigerant with an extremely low global warming potential.

  • Satellite danfoss
    Satellite launch towers

    The satellite launch tower is a vital facility. Reliable energy efficient inverter HVAC unit in this critical application was secured with Danfoss solution.

  • Danfoss variable speed technology for shopping mall air conditioning
    Shopping malls

    Inverter technology is improving one of the world's largest home DYI stores and helping gain Brazil’s first sustainability certificate with an innovative air conditioning installation.

  • Wind power danfoss
    Wind power

    Wind turbine producing water cooled by an energy efficient refrigeration system featuring inverter scroll compressor

  • College comfort danfoss
    College comfort

    The benefits of inverter air conditioners include energy efficiency in buildings, lower energy consumption, running costs and impact on power grid, accurate comfort and high quality in process.

  • Cooling resort centers danfoss
    Cooling resort centers

    Case on how inverter compressor improves humidity control and energy efficiency in building cooling and resort centres

Contact us

For further information, please contact us.