Daikin Europe NV has introduced two new EWAD model air cooled inverter controlled chillers designated AJYNN(S) and AJYNN(X) and featuring both high full load and maximum partial load efficiencies.
Daikin Europe NV has introduced two new EWAD model air cooled inverter controlled chillers designated AJYNN(S) and AJYNN(X) and featuring both high full load and maximum partial load efficiencies.
Available in capacities from 329 to 515kW in standard seasonal efficiency ‘S’ versions and high seasonal efficiency ‘X’ versions, as well as reduced and low noise options, the chillers utilise two fully independent R-134a refrigerant circuits, ensuring continuous operation during maintenance periods.
Stepped chillers can apply too much or too little energy for a given load, reducing efficiency and causing fluctuations in comfort levels. The new units however, provide maximum comfort and efficiency at all loadings, their use of stepless inverter technology also maintaining outlet water at a constant temperature, irrespective of load.
Chillers of course, operate for most of time under partial load conditions and these units have the highest European Seasonal Energy Efficiency Ratio in their class (up to 5.01 for the ‘X’ version) keeping annual operating costs down to an absolute minimum. They also offer 20% and 30% greater energy savings respectively than earlier Daikin high efficiency AJYNN(A) and standard AJYNN chillers.
Power when it’s needed
Inverter control of the new units not only plays a role in overall efficiency and quiet operation, it also varies the output power in relation to cooling demand by increasing compressor frequency, making it possible to achieve comfortable building conditions much more quickly on start up. Chillers are often specified for ambient operating temperatures of up to 35º C but when the ambient temperature exceeds this cooling capacity falls off dramatically. These units however, follow building demand, even when outdoor temperatures rise above the specified limits.
Low starting current and guaranteed high power factor
Unlike units that use so-called Y-delta or soft-start technology, the new chillers are designed such that start up current never exceeds that needed for maximum operating conditions. This eliminates the need for larger electrical systems to handle start up, thereby reducing installation costs and time. Furthermore, inverter control guarantees a power factor of .95 or greater in all operating conditions thus ensuring users receive the double benefit of a much lower initial running cost without the electrical surcharges that can be imposed by suppliers on less efficient equipment when the power factor drops below a given threshold (typically 0.90).
Low sound levels
Attention has also been paid to sound levels during partial load conditions, the combination of variable fan velocity and compressor frequency combined with structural vibration damping low noise levels at partial loads.
|
|
