Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an air conditioning system consisting of outdoor units connected via refrigerant piping to multiple indoor units. It allows individualized comfort control by adjusting the amount of refrigerant flowing to each indoor unit. Key components include inverter compressors, electronic expansion valves, and a centralized or wireless remote controller. VRF systems can provide both cooling and heating simultaneously via three-pipe heat recovery systems or in alternating modes with two-pipe heat pump systems. Advantages include energy savings, higher efficiency, individual zone control, and reduced operating costs compared to other DX or chilled water systems.

1. VRF System
VRV System

2. Introduction
• Variable Refrigerant Flow (VRF), also known as Variable
Refrigerant Volume (VRV)
• Invented in Japan, by DAIKIN in 1982
• Daikin had patented this technology and registered the term VRV
as an official trademark, so other companies called this technology
as VRF
• Daikin, Bluestar, Samsung, LG, Carrier, Mitsubishi, Midea,
Toshiba, York

3. SYSTEM
• It is a multi split air conditioning unit working on DX
principle with Single OUTDOOR UNIT(ODU) and Multiple
INDOOR UNITS(IDU)
• Interconnected with Refrigerant piping
• COOLING/HEATING can be controlled by adjusting the
amount of refrigerant flowing to each of the IDUs,
enabling the use of different capacities and configurations
• Individualized comfort control

4. OUTDOOR UNITS
INDOOR UNITS (Wall mounted, Ductable, Cassette,
Floor Standing)
Refrigerant Piping and Accessories (Refnets & Headers)
Inverter Compressor and EEV
Remote Controller - Wired and Wireless (Centralized
Controller for BMS)
COMPONENTS

6. TYPES OF VRF
SYSTEMS
Cooling Only
Only Cooling is possible
2 Pipe System
Heat Pump
Cooling and Heating
possible, but one at a time
2 Pipe system with a
reversible solenoid valve
Heat Recovery
Cooling and Heating
possible at same time
3 pipe System with
reversible solenoid valve
and branch selectors

7. ADVANTAGES
• Energy Saving claimed upto 30 %
• Higher COP compared to other DX systems
• Space Saving
• Lesser Noise
• Precise Temperature Control
• Zoned Comfort
• Reduced Operating Cost
• No seperate Control System required

8. LIMITATIONS
• Initial Cost is high
• Environmental Concerns (GWP of refrigerants)
• Refrigerant piping
• Limitation of height b/w and IDU and ODU in high rise buildings
• Seperate system for fresh air/ventilation required

9. CHILLER
VS
VRF SYSTEM

10. Design
VRF is very simplified refrigerant piping system.
More flexible than a chilled water piping sysetm

11. Control System
Easy network wiring for VRF

12. Control System
Easy control system compared to Chiller system.

13. Operation
Precise Temp Control for VRF

14. Installation/Operation
Less Space required. Sfaht space requirement is also less.

15. Commissioning
Less commissioning points required for VRF

16. Maintanence

17. Maintanence

18. THANK
YOU