Advanced chiller technology

Available as a single or dual circuit unit, the EWAD-TZ B offers cooling capacities from 170 to 700kW. The special screw compressor design with integrated inverter technology, has been combined with Variable Volume Ratio technology (VVR), which allows compressors to modify their own geometry, varying the condenser pressure charge to maintain high compression efficiency.

Daikin’s compressor motors have been optimised to operate at different speeds, with selection of the most efficient motor according to the nominal frequency of the chiller, to ensure the highest unit performance. Improved control logic for the economiser cycle control offers even further advantages and greater reliability.

The advanced design of the heat exchangers uses the latest available technology to deliver a high heat transfer coefficient while minimizing pressure drops. With three available levels of efficiency to choose from, customers can choose the best compromise between efficiency and price to suit their needs.

The EWAD-TZ B chiller incorporates a new microchannel condenser coil, designed for high thermal efficiency which uses 30% less refrigerant charge. With a new epoxy coated protective layer, the Microchannel coil is light and durable. However, R-134a, operates at slightly higher condensing pressures putting more pressure on the two manifolds that facilitate a two-pass process. In the first pass, the high-pressure superheated refrigerant is de-superheated and condensed into a liquid. The second pass sub-cools the liquid refrigerant below its saturation temperature prior to entering an expansion device.

Daikin says this construction provides a coil that is typically 50% lighter and uses, on average, 50% less refrigerant when compared to a traditional copper-tube/aluminum-fin coil design. Heat transfer is also enhanced, leading to smaller, more-efficient Micro-channel condensing coils Additionally, the all-aluminum uniform design provides a structurally robust coil that is hardy to formicary corrosion. 

All components are sealed in an insulated housing with compact electrical panel. The refrigerant system cooling system is designed to maintain the electrical circuits at a constant temperature extending the life and reliability of the system, while offering a wide speed modulation range.