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VRV or VRF?
Many people mistakenly believe that VRV and VRF are quite different technologies in the field of air conditioning. In fact, we are talking about the same thing. The difference is only in their name. VRV is abbreviated (Variable Refrigerant Volume), and VRF is shortened by (Variable Refrigerant Flow). Just as inventors of the system, Daikin Industries LTD have patented their name and other brands using the VRF abbreviation. Nowadays, the central air conditioning system is becoming more and more popular, and brands such as Samsung also have their own name for it. This is Samsung's DVM system, which is entering the market with full force.
And so. What is actually VRV / VRF / VRV?
This is a complex system where:
1. By electronic thermoregulating valves integrated into the indoor units (air conditioners), the amount of freon passing through them is precisely regulated. That's exactly why the Variable Refrigerant Volume (VRV) or Variable Refrigerant Volume (VRV) name.
2. Freon only circulates in the installation. The internal bodies are on direct evaporation. This is a great advantage over our well-known Chillers.
3. Compressors are already inverter and allow to reduce electricity consumption when the system is running at a lower load.
4. We have many indoor units (air conditioners) on the same refrigerating circuit. This can also be a minus, but with a well built installation and good maintenance, it will not be a problem.
5. This is a system built of modules that can cover the needs of huge buildings.
6. Nowadays with such a system, the possibilities for monitoring and control of a VRV / VRF system are almost unlimited.
The structure of the VRV / VRF system is as follows:
1. One or more external bodies with one or more compressors.
2. Indoor units (air conditioners), which can be many types: Wall, floor, channel, cassette, etc.
3. Installation of copper pipes with different diameters between the external and internal bodies. For the distribution of the freon to the indoor units, special distributors, called Joints, are used. Joints are used instead of tees, mainly because of the flow of the freon and the circulation of oil in the system.
4. Operational cabling for communication between external and indoor units (air conditioners) and their controls. In most cases, this is a two-wire cable that creates an internal closed network and is a major part of any VRV VRF installation.
But how do VRV / VRF systems work?
The logic of operation of each VRV / VRF system is software-based boards that are built into the indoor and outdoor units. Naturally, every manufacturer keeps this software secret, but the principle of everyone is similar.
By pressing one or more buttons on the control of any indoor unit in the VRV / VRF system, the user signals the machine to start or increase its power. He also says what is the fan's preferred temperature and speed, for example. The system receives the signal and is informed by sensors and its complex electronics for: External and internal temperature, how many bodies are ready for operation, what kind of mode and so on. At any moment, the outdoor body "knows" how many indoor bodies it has on its system. Namely, the VRV / VRF system's ability to "inform" and "adjust" to the surrounding environment makes it very effective. Inverter compressors and fans will operate with the required power of the installation without over cooling or overheating.
There are several types of VRV / VRF systems:
1. Only cooling. These systems are not popular and not suitable for our climate. We will not stop at them.
2. Cooling and Heating (Heat Pumps). These are the most common systems. They have the option of operating the system in "cooling" or "heating" mode. What is special about them is that the whole system works only in one mode that is defined by a control in the system called Master.
3. Thermal recovery systems. They are also not very common, mainly because of their high price, but they are the "cherry on the cake" in the development of VRV / VRF systems. What is special about them is that besides the standard two pipe installation, a third one appears here. Also, electronic distribution valves are removed from the indoor units in distribution boxes. This allows two indoor units from one system to operate simultaneously in different modes (cooling and heating).
As technology advances, each VRV / VRF system can be remotely controlled. It can also be tied up with BMS (Building Management Systems), making it an excellent solution for office buildings, shops or hotels.
If you are looking for a similar system, you can contact us on the phone or e-mail mentioned on the site. We will be glad to help you choose a brand, model and VRV / VRF type.
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