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Comparison Between VRF and VRV Systems

Variable refrigerant flow & Variable refrigerant volume VRF & VRV

Variable refrigerant flow & Variable refrigerant volume VRF & VRV

Q: What is the VRF SYSTEM?

A: Variable refrigerant flow system consists of one condensing unit outdoor unit and several indoor units (evaporator)The Compressor controls the amount of flow and volume of the liquid depending on the number of internal units that operate, saving energy.This type is used in green buildings and desert places where it is difficult to provide water as a cooling medium.This type is characterized by variable load, not fixed load, as in the case of direct expansion - a system that has one external unit with one internal unit and the load is fixed.This system allows thermostat in each room to control the temperature of each room individually. In other words, in a Variable Refrigerant Flow (VRF), a room, eg, a temperature of 23 ° C, a room next to it and connected to it in the same external unit, It has a temperature of 25 ° C because each thermostat has its own expansion valve in the external unit.

Q: What types of VRF system?

1- Air Cooled VRF
2- Water Cooled VRF

Q: What is the difference between VRV SYSTEM & VRF SYSTEM?

A: The VRF system is the same as the VRV system. It is a two-way system, but the VRV system is adopted and registered by a Japanese company called DAIKIN company. The VRF system is adopted by FUJITSU company

Q: What are the advantages of the VRF SYSTEM or VRV SYSTEM?

1- High efficiency
2 - Lower consumption of energy in the case of the use of part of the internal air conditioners and the closure of another part, which is the system part load Faisal energy saving to about 55% of energy.

Q: What are the disadvantages of the VRF SYSTEM or VRV SYSTEM?
1 - more complex than the system of direct expansion
2 - needs a trained and experienced labor.

Note :
  • The greater the distance between internal and external units, the greater the cost of installation and operation.
  • The vertical height permitted between internal units and external units is 46 meters vertical distance and the non-vertical distance between indoor and outdoor units is 220 meters.
  • Can be installed with the external unit outdoor unit varied internal units either wall mounted or ceiling mounted or cassette or any type of separate air conditioning Split AC
  • The VRF SYSTEM or VRV SYSTEM can also be designed to give cooling and heating at the same time. It will not be used in some applications. It is usually used in large applications exceeding 6 tons, but higher than using the VRF SYSTEM or VRV SYSTEM to cool all internal units or to heat all internal units.
  • In case all interior units are working, either heating all or cooling, this system is called two pipes system.
  • In the case of some of the internal units are heating the place and some of the cooling works this system is called  three pipes system
  • The VRF SYSTEM or VRV SYSTEM is designed at the atomic point and maximum consumption when all internal units work at the same time.