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Daikin Third Generation VRVIII Has Many New And Innovative Features

Daikin Europe N.V. has announced the introduction of a third generation of its much acclaimed VRV range of air conditioning systems with the extensively re engineered and RoHS compliant VRVIII. Available initially in heat pump and cooling only versions, VRVIII incorporates all the best features of earlier VRV systems. However, it also possesses a considerable number of new design, installation and maintenance refinements, particularly as regards capacity, performance and refrigerant leakage control.

Many new design features
First and foremost, system capacity is 12.5% greater at 5 – 54HP (cooling only 5 --18HP), enabling up to 64 indoor units to be connected to a single heat pump system – an increase of 33%. Furthermore, total system piping length is increased from 300m to 1,000m and vertical separation between outdoor and indoor units from 50m to 90m. Additional flexibility is found in the distance from the first refrigerant branch. Here the longest length minus the shortest length from that first branch cannot be greater than 40m. The longest piping length after the first branch however, can be 90m maximum. VRVIII therefore, represents the ideal air conditioning solution for large and multi storey buildings.

The new system allows far more flexibility in unit combinations since, with the exception of the 5HP model, any size unit can be combined with any other size unit. Users therefore, are able to select combinations to match their own requirements precisely – such as high COP or minimum footprint installations. Moreover, VRVIII offers up to 200% overall increase in unit connection ratio for a single outdoor system. For a double system the connection ratio is 160% and for a triple outdoor unit system the connection ratio remains 130%. Also, whereas VRVII 10HP units for example, could only be connected to 16 indoor units, the same capacity VRVIII unit can connect with 25 indoor units. This facility allows cooling to be switched from one side of a building to the other to combat localised heat gains caused by morning or afternoon sunshine.

Overall performance is also substantially enhanced, due primarily to refinements to the system’s purpose designed inverter driven, improved high efficiency ‘G’ type scroll compressor, which operates at a higher speed and reduces the losses due to higher speeds by 2%. Friction losses are also reduced by virtue of its high thrust mechanism, which generates improved efficiency and lower operating noise. Furthermore, the innovative method of supplying oil to the scroll by means of differential pressure improves lubrication and unit reliability. Developments such as these enable VRVIII to return maximum COPs at full load of 3.80 in cooling mode and 4.17 in heating mode.

The use of dual high output DC motor driven fans, complete with specially designed low pressure loss fan guards and super efficient triple wall heat exchanger, provides 10%(max) greater airflow with no increase in operating noise. The application of airflow analysis to these fans has optimised their casing compatibility, reduced pressure losses and an increase in external static pressure from 58.8Pa to 78.4Pa. Outdoor unit footprint is less than earlier similar capacity VRVII models but ducting height remains the same despite the new system’s higher capacities.

The incorporation of an upgraded low noise compressor reduces operating sound by 5dB with a further 3dB reduction due to a 200% increase in sound insulation. This ensures year round quiet operation and at night during which operating noise can be reduced in 2 steps to 50dBA and then 45dBA and also at transitional periods. Furthermore, the supply of power to the inverter is cut off when indoor units are shut down by remote control, resulting in a reduction in standby power consumption of about 30%.

Improved reduced refrigerant leakage control
An important environmental and installation feature inherent in VRVIII is the ability to control the amount of additional refrigerant charging during commissioning. Pressing the ‘start’ button on a printed circuit board within the outdoor unit casing after connecting the refrigerant cylinder to the charging port, initiates charging, which ceases automatically once the appropriate volume of refrigerant has been transferred. Automatic testing of wiring, shut off valves, sensors and refrigerant volume is activated during charging by pressing the ‘test operation’ button on the same circuit board.

Leakage prevention is further supported by the use of brazed joints in place of flanged and flared connections before the shut off valves and also by brazed pressure sensors and electronic pressure gauges instead of sensors and gauge ports.

Installation and maintenance features VRVIII installation is simplified by the absence of oil equalising piping on installations of 2 or more modules – this reduces field piping time and piping insulation. Piping installation is also made easier and more reliable by brazed connections in the liquid and gas shut off valves. Raising the position of the power supply terminal panel in the electrical cupboard box, which is waist high and accessible from the front panel, provides more working space for installers.

VRVIII is supported by a full range of indoor units comprising 2 and 4 way blow ceiling cassettes, special 600 x 600mm low noise multi flow cassettes, ceiling mounted corner, built in ducted, ceiling suspended, wall mounted, floor standing and concealed floor standing models.

Compatible with the complete Daikin suite of advanced air conditioning monitoring and control systems (Intelligent Touch Controller, Intelligent Manager, BACnet Gateway and LONWorks Compatible Gateway), the new VRVIII offers high energy saving, precisely controlled and monitored air conditioning solutions for all medium to large sized commercial building projects.

Email: marketing@spaceair.co.uk