Seasonal energy efficiency in buildings, capacity modulation, greater comfort with air handling units
Air handling units with integrated cooling are used in commercial applications for air conditioning in many different kinds of buildings, from small office buildings, fitness centres and medical institutions to skyscrapers.
A packaged air handling unit with integrated cooling is used to condition and circulate air as part of complete ventilation and air-conditioning system. This packaged system comprises fans, a cooling section, filters, and dampers. The unit connects to ductwork that distributes the conditioned air throughout the building.
The Danfoss inverter compressor solution for commercial HVAC applications enables a system with an integrated cooling unit to modulate the air cooling capacity between 25% and 100% when a single compressor is used, and between 12.5% and 100% with tandem compressors (modulation range for large VZH compressors). The unit adjusts to the varying loads that the building needs during the day.
One of the main benefits of using Danfoss inverter compressors for this application lies in the energy savings obtained. The Danfoss inverter compressor solution provides significant improvements in seasonal energy efficiency. This Danfoss solution can create annual energy savings ranging between 15% and 35% compared to traditional liquid cooling systems, depending on the load profile and the climate. Capacity modulation will accommodate the varying loads in the system.
Another important benefit is the compactness of the unit. The compact unit design reduces both transportation costs and the footprint for the system as a whole. Units like these can be installed inside the building in situations where traditional liquid cooling systems may need to be installed outside the building because of space constraints.
We expect to see these energy-efficient packaged solutions being used for an increasing proportion of air treatment and conditioning installations. Installation is simpler than with traditional cooling systems, which typically combine a water-cooled chiller and water pump connected to a dry cooler and air handling unit. Installation costs can be reduced by 15 to 40%, and installation time is also less than that needed for traditional systems.
To illustrate the energy cost savings: for in an installation in Europe for a 2,000 m² floor space area, and with an energy cost of € 0.10 per kWh, the potential energy savings could range from €340 to €600 per year, depending on the location.
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.
Danfoss reciprocating inverter compressors avoid oversized and short cycling systems. The compressor automatically adapts to the current load. By combining an efficient Danfoss Maneurop® reciprocating compressor with a Danfoss Drive, the company provides an innovative and intelligent package that utilizes variable-speed technology to ensure superior efficiency across the entire operating range for precision cooling.
Danfoss inverter scroll compressor VZH offers effectiveness and reliability. Over 30% energy savings is possible in rooftops, chillers, close controls etc.
Danfoss Turbocor®model TTS oil free compressors are available in four different models ranging from 60 tons to 200 tons / 200 to 700 kW utilizing R134a or low GWP R513A.
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Case on how inverter compressor improves humidity control and energy efficiency in building cooling and resort centres
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