Daikin has launched a new generation of inverter driven air-cooled and water-cooled screw chiller series with refrigerant R-1234ze(E).
The air-cooled chiller range (TZ series) will be available from 130 kW up to 830 kW cooling capacity. The water-cooled chiller range (VZ series) will be available from 340 kW up to 1600 kW cooling capacity.
The selection of R-1234ze(E) minimises the global warming impact of screw compressor chillers thanks to low Global Warming Potential in combination with high energy efficiency.
R-1234ze(E) is an HFO refrigerant (Hydro Fluoro Olefins). Its Ozone Depletion Potential (ODP) is equal to zero (0) and the Global Warming Potential (GWP) is 7 (according to the EU F-gas Regulation based on IPCC Fourth Assessment Report). The GWP value is less than 1 according to the IPCC Fifth Assessment Report.
The new range of screw compressor chillers will be equipped with a Daikin designed inverter driven single screw compressor with Variable Volume Ratio (VVR) technology.
An inverter drive modulates chiller capacity at part load in the most efficient way, while VVR (Variable Volume Ratio) adjusts compressor operation at any temperature conditions. A sliding valve fine-tunes refrigerant discharge pressure to match the operating condensing pressure. In this way, a refrigerant is compressed to just the right pressure level thus minimizing the energy losses typical of standard compressors designed with fixed volume ratio. Both inverter drive for capacity control and VVR for discharge pressure fine-tuning, work synergistically in order to optimize unit efficiency at any operating condition.
Thanks to this superior technology, the current Daikin R-134a, and new R-1234ze(E) series are already compliant with 2021 Ecodesign efficiency requirements. The R-134a ranges will be maintained in the Daikin product portfolio allowing for a smooth market transition. The introduction of the new R-1234ze(E) range will provide a long-term solution that supports the HFC phase-down schedule of the F-gas Regulation.
Daikin's Refrigerant Policy
Daikin has a long history of continually reducing the environmental impact of cooling, heating and refrigeration products, as well as having a unique expertise that comes from manufacturing both refrigerants and equipment. This position is a result of the company's corporate philosophy to "Be a Company that Leads in Applying Environmentally Friendly Practices".
Regarding refrigerant choice, Daikin has expertise in using fluorinated (HFC, HFO) as well as non-fluorinated gases (ammonia, carbon dioxide, hydrocarbons), because the company believes in diversity of refrigerant choice to allow the best-suited solution to be used in each application.
For a complete overview, please access “Daikin’s Policy and Comprehensive Actions on the Environmental Impact of Refrigerants”.