What is a VRF air conditioner

VRF systems: "Variable Refrigerant Flow" simply explained

In Germany one often counts on three-part heating, cooling and ventilation concept. One system ensures that the rooms are heated (heating system), one system for ventilation (ventilation system) and one for cooling (air conditioning).

Especially in modern buildings with z. B. large glass fronts reveal many control problems in practice. Because while it z. B. in the part of the building facing away from the sun is still cold and has to be heated, so there is in the part of the building facing the sun the first cooling requirement. Internal cooling loads for computers, servers, etc. are another application.

Although it is technically possible to transfer more energy (heat) from one room to the other with the heat requirement, this succeeds internal displacement with the separately designed systems rather bad or not at all. This is where VRF technology comes into play: It combines cooling and heating in a technical system.

The acronym VRF stands for "Variable Refrigerant Flow"what to do with "Variable refrigerant flow" translates.

VRF systems can also use the heat transport from one control area or part of a building to another. In hotels z. For example, excess heat from the kitchen can be used for the wellness area and when it closes, the heat is transported into the hotel lobby. In office buildings, with the help of VRF systems, the waste heat from the server room can be used to heat the office space.

VRF systems are so-called direct evaporators that are used for energy transfer without another heat transport medium get along. Since the usual heat transfer via a heat exchanger is associated with heat losses, the resulting heat losses can be saved using direct evaporators.

The refrigerant then flows directly in the associated copper pipes from the outdoor unit to the connected indoor units. It goes less energy lost than with water-bearing systems. In addition, the power consumption of the VRF system can be reduced, as there is no need for an extra pump to drive the heating circuit.