By operating at varying speed, VRF units work only at the needed rate allowing for substantial energy savings at partial load conditions. Variable refrigerant flow also known as variable refrigerant volume. It is an HVAC technology in which refrigerant is conditioned by a single outdoor condensing unit and is circulated within the building to multiple indoor units.
VRF’s are typically installed with an air conditioner inverter which adds a DC inverter to the compressor in order to support variable motor speed and thus variable refrigerant rather than simply performing an on/off operation.
The term VRF refers to the ability of the system to control the amount of refrigerant flowing to each of the evaporators, enabling the use of many evaporators of differing capacities and configurations simultaneous heating and cooling in different zones.
In the older type of VRF the speed of the compressor is controlled by an Inverter which is responsible for modulating the refrigerant flow in the system. In the new type VRF the inverter is replaced by the Digital scroll technology in which the compressor capacity is modulated by having a scroll compressor run unloaded for a specific sequence.
Note the term VRF systems should not be confused with the centralized VAV (variable air volume) systems, which work by varying the air flow to the conditioned space based on variation in room loads.
Enormous saving of electricity up to 55% which is drastically high when compared to other HVAC systems.
Supplies heating or cooling when and where it is required without the change in room temperature.
No power fluctuation since there is no on/off structure.
In a VRF system, since the speed of the compressor can be varied, the compressor does not cycle on and off, but operates continuously for longer periods.
The required refrigerant flow is supplied to the indoor fan coil and once the set point is reached, the refrigerant flow is adjusted to maintain the room temperature smoothly without fluctuation.
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