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VRF is variable refrigerant flow systems.in simple words its advantage is this system can connect more indoor units in to a single outdoor unit.power effiency is its another advantage.
VRF means VARABLE REFRIGERANT FLOW SYSTEM. This System consists of one Condenser / Condensing Unit with multiple Evaporator / Indoor Units, each evaporator having one expansion valve to control the flow of refrigerant as per the load on the serving room.
Advantages
1.no need to install ducts, cost reduction of installation
2.Power saving
3. mainly useful in public areas
Dis - Advantages
1.System is complicated when compare to Split units
2.this system required qualified / skilled man power
vrf (variable refrigerant flow ) system it's the latest technology for hvac this system consist of one external unit with many internal unit , this system used for variable load i.e. every space can be has own temperature although this connected by one compressor because every unit has own expansion valve
advantage :
1- high effisency
2- low power consumption
disadvantage :
1- more complicated than dx system
2- because this system new , it need qualified technician
Variable Refrigerant flow. saving power because of diversity of the indoor units that connected to the one VRF outdoor unit.
VRF is variable refrigerant flow systems.in this system can connect more indoor units in to a single outdoor unit.
Variable refrigerant flow (VRF) is an HVAC technology invented in Japan by Daikin company in 1982.[1] Like ductless minisplits VRFs use refrigerant as the cooling and heating medium. This refrigerant is conditioned by a single outdoor condensing unit, and is circulated within the building to multiple fan-coil units (FCUs).
VRFs 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 flow rather than simply perform on/off operation. By operating at varying speeds, VRF units work only at the needed rate allowing for substantial energy savings at partial-load conditions. Heat recovery VRF technology allows individual indoor units to heat or cool as required, while the compressor load benefits from the internal heat recovery. Energy savings of up to 55% are predicted over comparable unitary equipment.[1] [2] This also results in greater control of the building's interior temperature by the building's occupants.
VRFs come in two system formats, two pipe and three pipe systems. In a heat pump 2 pipe system all of the zones must either be all in cooling or all in heating. Heat Recovery (HR) systems have the ability to simultaneously heat certain zones while cooling others; this is usually done through a three pipe design, with the exception of Mitsubishi which is able to do this with a 2 pipe system using a BC controller to the individual indoor evaporator zones. In this case the heat extracted from zones requiring cooling is put to use in the zones requiring heating. This is made possible because the heating unit is functioning as a condenser, providing sub-cooled liquid back into the line that is being used for cooling. While the heat recovery system has a greater initial cost, it allows for better zoned thermal control of a building and overall greater efficiencies.[3] Wiki
VRFs 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 flow rather than simply perform on/off operation. By operating at varying speeds, VRF units work only at the needed rate allowing for substantial energy savings at partial-load conditions. Heat recovery VRF technology allows individual indoor units to heat or cool as required, while the compressor load benefits from the internal heat recovery. Energy savings of up to 55% are predicted over comparable unitary equipment. This also results in greater control of the building's interior temperature by the building's occupants.
Advantages
VRF Variable refrigerabr flow System
Single Outdoor with variable speeds DC compressors
Multiple indoor with temperature sensing devices and electronic expansion valves
provides a superior energy efficiency than any other RF system
