Daikin Europe N.V. announced last October 2008 the launch of the world’s first CO2-based VRV® system at Chillventa trade fair at Nuremberg. CO2 has one of the lowest GWP (GWP=1) of all existing refrigerants, once again demonstrating Daikin’s leadership in the VRF market and environmental consciousness. Parallel to this development, Daikin is continuing to pursue improvements in its current HFC -based VRV® systems with respect to both energy-efficiency and environmental impact.

Another World First

The launch is one more in a series of world firsts for Daikin. As was the case with the launch of the 1st VRV® generation in the early 1980s, the launch of a CO2-based VRV®-system will mean new installation techniques and certifications. Here again Daikin is fulfilling its pioneering role in this process, paving the way for new technologies and products. The new CO2 VRV is part of Daikin’s strategy to limit the impact of air conditioning on the environment and to stay ahead of environmental legislation. This world first will also be on display at the Climatización (Madrid) trade fair in February 2009.
Daikin is worldwide market leader in VRF systems, and intends to consolidate this leadership by launching and improving new VRV® extensions – such as CO2 VRV – and by perfecting its existing HFC-based VRV® systems, reducing further the TEWI impact of both ranges.

GWP = 1

Daikin has been researching possible alternatives to HFC-based refrigerants for decades. One of these alternative refrigerants is CO2, with a promising GWP value of 1. Daikin’s first product using CO2 was Eco Cute, a CO2-based domestic hot water system available in Japan. CO2 is indeed ideal for domestic hot water systems such as Eco Cute. For direct expansion comfort systems such as VRV® however, use of CO2 as refrigerant is a less obvious choice since many new technologies had to be developed to make the system a viable and safe comfort solution. Daikin applied its advanced engineering and succeeded in developing a VRF system using CO2 as refrigerant. Daikin is also the first VRF manufacturer to bring a CO2 based VRF system to the market. The CO2-based VRV® was displayed for the first time at the Chillventa trade fair at Nuremberg in October 2008. However at this stage Daikin’s current HFC-based VRV® systems still yield better EER and COP values. In the future Daikin will continue its efforts to enhance both systems’ efficiency ratios.

New technologies and features

Since CO2 has a low critical point of 31°C, the CO2 VRV uses the CO2 in a transcritical refrigeration cycle. To optimise performance, Daikin equipped its CO2 VRV with a range of new technologies, such as the unique Daikin dual compression swing compressor. This Daikin compressor was developed to provide optimum performance at high discharge pressures and is able to handle high pressure differences.
CO2 VRV also incorporates new optimised refrigerant circuit technology including the Dual Stage Inter-Cooler circuit - enabling optimum refrigerant control & efficiency - and a gas cooler with three-row heat exchanger for maximum heat exchange between the CO2 gas and the ambient air. Moreover, piping size has been reduced compared to R-410A VRV systems.
An automatic test run function, night quiet mode, and connectivity with all current VRV® control & management systems complete the system’s main features.

Serving specific markets and segments

At this stage the new CO2 VRV system is intended to demonstrate and investigate new environmental technology. Daikin expects that CO2 VRV will be welcomed by customers wishing to install HFC-free systems. Since CO2 VRV has attractive COP levels, Daikin is targeting applications where heating demand is stronger than cooling demand. CO2 VRV will be on display at Climatización (Madrid) trade fair in February 2009.
For more information on the Daikin Europe N.V. product range, visit www.daikin.eu.
1 GWP = Global Warming Potential
2 HFC = HydroFluoroCarbon (e.g.: R-410A, R-407C)
3 TEWI = Total Equivalent Warming Impact: sum of direct (refrigerant) and indirect (energy use) emissions of air conditioning technologies being compared. TEWI confirms the importance of energy efficiency and emissions reduction for air conditioning systems.
Source: www.daikin.eu/