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Next generation water cooled chiller introduced

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Daikin has introduced the new DWDC C series with R-1234ze(E) refrigerant. Image credit: Daikin
Daikin has introduced the new DWDC C series with R-1234ze(E) refrigerant. Image credit: Daikin

Consolidating the competitiveness of the new Centrifugal Compressor Water Cooled Chiller, Daikin has introduced the new DWDC C series with R-1234ze(E) refrigerant.

Offering increased capacities and expanded applications possibilities, the new chillers are the latest in an array of innovative products developed by Daikin to help specifiers and end users stay one step ahead of EU legislation and rising energy costs.

The new DWDC C series is the next generation water cooled chiller and incorporates brand new features in a unique design for every component manufactured by Daikin.

This product relaunches the consolidated fame of the company’s centrifugal chiller series in a brand new design specifically developed to satisfy the European and Middle Eastern markets.

Available in a wide choice of cooling capacities and component combinations, the range has been developed to optimise energy efficiency and reduce operating costs. Maximising performance at both full- and part-loads, the new Dual compressor chillers are available with R-134a or R-513A or R-1234ze, in single refrigerant circuit design.

As part of a building system, centrifugal compressor chillers represent a significant investment. Suitable for new builds or retrofits, the new chiller range delivers real benefits for the bottom line.

The dual compressor DWDC C chillers offer many benefits, including outstanding part-load efficiency and system redundancy similar to two separate chillers, with a lower total installed cost. The DWDC C can be equipped with Variable Speed Drive, for which Daikin has introduced a brand new and enhanced solution with this latest product series.

The company’s DWDC C dual centrifugal compressor chiller range offers a choice of cooling capacity from 2100kW (600RT) up to 9000kW (2500RT) with both R-134a and R-513A & cooling capacity from 1500kW (450RT) up to 6700kW (1900RT) with R-1234ze at nominal AHRI conditions.

All models fitted with single refrigerant circuit

‘Right-sizing’ chiller selection offers reduced installation costs from the outset: DWDC C series allows virtually infinite combinations of heat exchangers, gears, and semi-hermetic motors to provide the exact required capacity, minimising the need for a costly step up to a larger-size chiller package.

Redundancy feature

Daikin DWDC C dual centrifugal compressor chillers have two of everything connected to the evaporator and condenser – two compressors, two lubrication systems, two control systems and two starters.

If any component on a compressor system fails, the component can be removed or repaired without shutting down the other compressor; providing an automatic back-up with at least 60 percent of the chiller design capacity available on DWDC units.

Redundancy is also built into the distributed control system, which consists of a unit controller, a compressor controller for each compressor and an operator interface touch screen. The chiller will operate normally without the touch screen being functional. If a compressor controller is unavailable, the other compressor will operate normally and handle as much of the load as possible.

Lower inrush current

With DWDC C dual compressor chillers, there are two smaller motors (as compared to a single compressor chiller with one larger motor) which produce the same cooling capacity. The microprocessor control logic is built in such a way that when the second compressor is to be started, the first compressor is unloaded further and the second compressor startup is initiated. This starting method reduces the total inrush current of the dual compressor chillers. Additionally, if an emergency power back-up generator is utilised, this method can reduce the size of the generator.

Lower run hours

For chillers operating at 60% and below load for DWDCs, Daikin has programmed the unit controls to allow only one compressor to run, which results in lower run hours. Lower run hours inherently reduce wear and tear of the compressor and increase its overall life as compared to a single compressor chiller.

Single circuit DWDC chillers

These chillers have a single-refrigerant circuit for the evaporator and condenser with two compressors running in parallel and are available in one, two or three-pass configurations. Their salient feature is that at single-compressor, part load operation, the running compressor can utilise the entire chiller’s heat transfer surface, providing outstanding part load performance.