Extending low GWP refrigerant to the water-cooled centrifugal chiller range

After launching the DWSC-C centrifugal chiller series in 2021, Daikin is further extending the centrifugal range of products introducing the DWDC-C range from August 2022.

With this release the use of low GWP refrigerant R-1234ze will be extended to the whole centrifugal range, which already offered the possibility to benefit from the advantages offered by R-134A and R-513A refrigerant. The combination of the HFO refrigerant R-1234ze with Daikin’s centrifugal technology, will now help offering increased capacities and expanded applications possibilities, allowing specifiers and end users to stay a step ahead of EU legislation.

The new range has been specifically developed to increase energy efficiency, both at full and partial load, ensuring end users can benefit from reduced operating costs. So, while centrifugal compressor chillers can be a significant investment, Daikin’s new translates into real benefits for the bottom line.

Entirely designed and manufactured by Daikin, this new centrifugal Series has been created to meet the needs of both European and Middle East markets, and offer a suitable solution for a wide range of applications – from commercial cooling, to district energy plants and manufacturing processes.

Read more here about why to choose a centrifugal chiller

Extreme energy efficiency and reduced environmental impact

The new range with R-1234ze provides a long-term solution to the HFC phase down schedule of the F-gas Regulation.

In fact, the use of the HFO refrigerant R-1234ze makes the DWSC and DWDC-C centrifugal range an environmentally friendly solution, combining low Global Warming Potential (7), zero Ozone Depletion Potential and very high energy efficiency.

What is new with this centrifugal chiller range extension

The new centrifugal chiller range is now are available with R-134A, R-513A or R-1234ze refrigerants.

The new Series offers a wide choice of cooling capacities – from 1050kW (300RT) up to 4500kW (1250RT) with both R-134A and R-513A refrigerants, and from 790kW (225RT) up to 3200kW (910RT) with R-1234ze at nominal AHRI conditions for the DWSC. While the DWDC Series can offer a choice of cooling capacities from 2100 kW up to 9000 kW with R-134A and R-513A), and  1500 kW up to 6700 kW with R-1234ze.

All models are developed with a unit-mounted Daikin Inverter, to provide outstanding full-load and part-load performance.

Other than that, the new series offers reduced installation costs, thanks to the flexibility ensured by the infinite combinations of heat exchangers, gears, and semi-hermetic motors, which allow to provide the exact required capacity, minimizing the need for a costly and too large configuration for the actual needs of the building.

Regarding matching the needs of a building, the flexible control logic of the in-house developed inverter, maps exact performance curves at every condition, adjusting speed to deliver the required cooling capacity. This allows both DWSC-C and DWDC-C  chillers to take advantage of off-design conditions and save energy, especially in comfort cooling applications with variable loads, but also in process cooling applications with constant heavy load such as data centres, for instance.

The unique design of Daikin’s Inverter uses fewer internal components to create the optimal balance between cost and performance and ensuring low in-rush currents to the chillers, that reduces the risks of overheating and wiring deterioration and increases reliability.

Also, Daikin’s Inverter is available in a Low Harmonic version, to match <5% THDv and meet or exceed IEEE-519 2014 compliance.

Read more here about the benefits of using inverter technology

The design simplicity of Daikin’s centrifugal compressors, then, provides increased durability and reliable performance. In fact, the centrifugal compressors by Daikin are deigned to reduce the discharge area as load decreases, to maintain gas velocity, greatly reducing the tendency to stall or surge.

Among the other notable features there is the new heat exchanger’s flood-type technology – developed by Daikin to improve heat transfer performance, thanks to the most advanced tube type available – the free cooling option, and the possibility to customize the units to suit marine applications.

The dual compressor DWDC-C chiller, then, offers system redundancy benefits equivalent to two separate chillers. This feature results in a lower total installation costs. The dual compressor DWDC-C chiller, in fact, can provide costs savings up to 35% compared to installing two separate chillers by reducing hardware and rigging costs, and then eliminating second chiller piping and pumps.

Monitoring & control

The new DWSC-C centrifugal range by Daikin, features the Microtech4 controller, which brings in a whole set of new functionalities compared to its predecessor. The integration of the iCM in the unit controller, or the possibility to develop advanced logics and algorithms at unit level, for instance. But also, the performance monitoring functionality, which allows to read the performance of the unit on the controller display or from the cloud, through Daikin’s remote monitoring platform Daikin on Site (DoS). Those are all features included with the new control logic.

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