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What's the difference
between VRV and VRF?

VRV and VRF: Understanding the Differences and Benefits

An Overview of VRV and VRF Technologies

A common misconception is that VRV and VRF represent separate HVAC technologies. However, they are actually two different names for the same technology. Inverter technology compressors form the basis of these systems, and Daikin introduced the first VRV HVAC systems in the early 1980s.

Daikin established the term VRV, representing Variable Refrigerant Volume, as their proprietary trademark. Alternative manufacturers employ the term VRF (Variable Refrigerant Flow) for their corresponding HVAC systems. Gradually, VRF has become the more prevalent term for these systems.


VRV vs. VRF: What's the Difference?

The terms VRV and VRF both refer to the same technology, with VRV being a copyrighted term by Daikin, while VRF is used by other manufacturers such as Fujitsu. These systems provide enhanced comfort at lower operating costs due to their ability to modulate refrigerant flow to meet the unique needs of each specific area in a building.

What is VRF HVAC Technology?

VRF can be considered the "the creme de la creme" of air conditioning systems.

It is a highly sophisticated air conditioning system based on several principles:


• Refrigerant-only systems, where refrigerant is the sole coolant material (unlike chilled water systems that use refrigerant to cool or heat water circulated throughout the entire system)

• Inverter compressors that reduce power consumption with partial cooling or heating loads

• Multiple air handlers (indoor units) on the same refrigerant loop/circuit

• Modular expansion capabilities, particularly suitable for large projects that can be developed in stages

Typical VRF System Structure

A standard system includes an outdoor unit (with one or more compressors), several indoor units (often incorrectly referred to as "fan coils"), refrigerant piping running from the outdoor to the indoor units, Refnet Joints (copper pipe distributors), and communication wiring.

Communication wiring consists of a two-wire cable chained from the outdoor unit to all indoor units, creating an internal closed-loop network. This is a crucial component of any VRF installation.

Each indoor unit is controlled by its own wired control panel, with options for wireless remotes (IR) and centralised controllers, allowing control of all indoor units from a single location.

How Does VRF HVAC Technology Work?

The VRF system's operational logic is built-in and proprietary to each manufacturer. The system takes input from the user (e.g., desired temperature) and the environment (external ambient temperature). Based on this data, it applies its logic to achieve the desired comfort conditions while optimising power consumption.

The system's ability to adapt to outdoor conditions is one of the main factors contributing to its efficiency compared to traditional water-cooled systems based on chillers and fan coils.

Contact JC Watson

Don't hesitate, ensure your business benefits from cutting-edge VRF and VRV air conditioning solutions with JC Watson. Reach out to us today on 020 3733 3050 or email us at info@jcwatson.co.uk to arrange a complimentary site survey and obtain a comprehensive report on the most suitable air conditioning options for your business.

Types of VRF HVAC Systems

• Cooling Only systems (less popular) – these systems can only cool, with no heating available. Fan and Dry modes are available for each indoor unit independently based on your requirements.

• Heat Pump systems (most popular) – all indoor units can either heat or cool (not simultaneously). Fan and Dry modes are available for each indoor unit independently based on your requirements.

• Heat Recovery systems (less popular) – these systems are the most advanced, allowing each indoor unit to provide cooling and heating independently and simultaneously.

A Common Scenario

Initially, the system is at a standstill (everything is switched off).

As soon as a user activates an indoor unit using its local remote, the outdoor unit takes notice and begins to operate. At this stage, it assesses the outdoor conditions (temperature) and the indoor unit's operational requirements (operation mode, set point temperature), and adjusts the compressor accordingly to meet the indoor demands.

When additional indoor units are activated, the outdoor unit recalculates the combined requirements and adjusts the compressor's output to match the necessary level of demand.

This dynamic process continuously occurs with any changes made within the HVAC system. As explained, the system is entirely automatic and adjusts its power consumption based on the demand from the indoor units and external conditions.

Users can influence their desired indoor comfort by modifying settings such as the operation mode (On/Off), operation state (Cool/Heat/Fan/Dry/Auto), setpoint temperature, and fan speed (High/Medium/Low/Auto). Managing these parameters is essential for proper operation and seamless integration with the VRF system.

The Advantages of Investing in VRF/VRV Technology

To understand the benefits of VRF/VRV technology, let's examine how a conventional split central air conditioner cools a home. The refrigerant evaporates in the indoor evaporator coil, drawing heat from the air passing through it. The heated refrigerant then moves outside, where it is compressed and releases its heat. Simultaneously, the air handler distributes the cooled air throughout the house.

However, most homes are not a single, open space. Although ductless AC systems and zone-controlled central systems address the challenges of uneven temperatures throughout homes, VRF/VRV systems elevate the solution. These systems employ multiple indoor units installed in various locations and modulate the refrigerant flow to cater to the specific needs of each area.

Conclusion:

We take pride in delivering dependable and high-performance VRF and VRV air conditioning systems for businesses. Our team of skilled engineers boast decades of industry experience and are committed to providing the optimal air conditioning solutions tailored to your business's specific requirements. Our extensive range of services includes a free site survey, competitive pricing, end-to-end project design and execution, dedicated project engineers, and customised services to fulfil any unique demands.

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