lennox vrf outdoor unit
Benefits Of Using Lennox VRF System
October 26, 2021

How Does A VRF (Variable Refrigerant Flow) System Work?

VRF working explained

VRF systems use a refrigerant as the hotness conveying medium rather than water, as suggested by their name. A pump is constrained by a variable-speed drive to change the progression of refrigerant, contingent upon current load. These systems are not difficult to install once contractors get acclimated, giving adaptable operation and noteworthy energy effectiveness. One more benefit of VRF systems is their modular design, making them an incredible choice for projects built in stages.

]The basic version of a VRF system uses an external condenser unit that is used for one or the other heating or cooling. There are two refrigerant lines for supply and return, and different indoor fan-curls share them. Albeit this basic VRF setup doesn’t permit concurrent heating and cooling for various form areas, there are two manners by which the system can be adjusted to achieve this.

Two-Pipe System

When VRF systems use one storage line and one return line, sending a branch controller for synchronous heating and cooling of various structure regions is feasible. The branch controller is installed between the condenser unit and the piping network delivering refrigerant to the indoor fan-coil units. Areas that require cooling are provided with refrigerant in liquid forms (subcooled), and areas that need heating are supplied with refrigerant in gas form (superheated). Essentially, the heat extricated from cooled areas is delivered to heated areas, and the condenser gives the yield contrast needed to adjust heating and cooling.

Two-pipe VRF systems with a branch controller are suggested when the limit will be extended later on. Since the controller gives center to which all indoor unit interface, there is no compelling reason to adjust existing refrigerant lines during a development. Concurrent heating and cooling are just conceivable in a two-pipe system if a branch controller is sent. Then again, a three-pipe system can be used for buildings with synchronous heating and cooling needs.

Three-Pipe System

This VRF system setup uses three lines associated with the condenser unit: warming, cooling, and a typical bring the line back. The fundamental working guideline of a three-pipe VRF system is the accompanying:

• This capacity is incorporated into the outdoor condenser unit rather than using a branch controller to deliver either fluid or vaporous refrigerant.
• The three lines (fluid, gas, and return) are associated with all indoor fan coils. Every unit is furnished with a branch selector that switches the supply contingent upon the predetermined working mode – heating or cooling.
• The return is standard for all fan-loops, paying little heed to their working mode.

A three-pipe system, by and large, gives a higher heat recuperation proficiency than a two-pipe system with a branch controller. However, the system provides decreased adaptability to future extensions – the current refrigerant lines should be changed to add more fan-loops.

 

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