Next Generation Daikin VRV II is World's First Variable Flow System on R410A Refrigerant |
Daikin Europe NV has achieved a quantum leap forward in commercial air conditioning technology by the introduction of its VRV II, the worlds first R410A operated variable refrigerant flow system. Available in both heat pump and heat recovery versions, the new systems, which represents a considerable advance over earlier VRV systems, demonstrates Daikin’s innovative application of new technology and the latest HFC refrigerants to its VRV product programmes. Deliveries to the European Market are expected to commence mid 2003.
Loaded with new features
Many new features and installation benefits are incorporated in VRV II. Its operating range for example – 5Hp to 48Hp increment steps (22 system combinations), is wider than any of its contemporaries. Furthermore, its ability to run no less than 40 indoor fan coil units in heat recovery as well as heat pump cannot at present be matched by other comparable systems.
Technically advanced
The use of purpose designed dc reluctance inverter controller scroll compressors throughout the range is an important factor and results in high COPs. The dc motor of course, maintains high efficiency levels in the most frequently used ‘mid’ to ‘low’ settings, thereby reducing electricity consumption and costs. Powerful neodymium magnets (7 times more powerful than ferrite types) within the motor, increase torque and produced much higher power output to electrical input than can be generated by conventional motors. Optimising the sine wave curve of the motor also results in smoother rotation and enhanced motor efficiency. A significant improvement in heating mode is also realised with the extension of the operation range down to –20oC.
Continuous system operation
Continuous operation is ensured by the provision of double back up for compressors and outdoor units in order to maintain minimum emergency capacity. The new system also offers high reliability by balancing compressor duty by varying the starting sequence of multiple outdoor unit systems.
Improved outdoor unit fan efficiency
Additional ‘state of the art’ technology applied to VRV II outdoor units includes the industry’s first dc fan motor to be used in this manner, resulting in an improvement in fan efficiency of over 45%, particularly at lower speeds. Also, the use of new aerodynamically designed low noise, large airflow fans and discharge grilles reduces turbulence and pressure losses. Lower noise and savings in input power are also achieved by stacking the inverter and printed circuit boards within a new and more compact ‘aero’ box. Further important technical features include an e-Bridge circuit, which results in additional sub cooling and an e-Pass heat exchanger. This ensures more effective heat transfer across the heat exchanger and reduces the risk of ‘cold spots’ thereby improving efficiency.
Many installation advantages
Significant installation advantages inherent in VRV II include a 50% reduction in footprint (from 3.56m2 to 1.88m2 for a typical 16Hp system.) Maximum refrigerant piping length is increased to 150m and the standard 6mm H2O external static pressure specification meets the requirements for the ducted indoor installation of outdoor units. Finally, all outdoor units are equal height and depth and can be transported on site by a normal commercial lift.
Environmentally Friendly
The use of zero ODP R410A refrigerant in the VRV II system offers further environmental benefits including the use of smaller refrigerant charge, lead free PC boards and recyclable galbarium bottom plates.
Indoor fan coil units
VRV II is supported by a full range of indoor units comprising 2 and 4 way blow ceiling cassettes, ceiling mounted corner, built in ducted, ceiling suspended, wall mounted, floor standing and concealed floor standing models. A new 600 x 600mm multi-flow ceiling cassette has been introduced to satisfy changing requirements and fit into standard ceiling tile spaces. This unit has a very low operating noise levels of 29dBA at low speeds and a modified airflow discharge angle to reduce down draughts. A new wall mounted model (1.6 to 2.5Hp capacity) has also been introduced. Stylish and compact with a drastically reduced weight from 24 to 14kg and an occupied wall space some 22% less should endear this unit to the growing residential sector.
VRV II is compatible with the current Daikin suite (intelligent touch controller, intelligent Manager, BACnet Gateway and LONWorks) of advanced air conditioning monitoring and control systems.
