VRV/VRF part 2/Cooling type VRF/VRV

Cooling type VRF/VRV:

  • It is the simplest version of VRF.
  • It is designed for cooling purposes only.
  • It has the ability to cool more than one room as per the requirement of the rooms.
Block diagram of cooling type VRV/VRF:
Block diagram of cooling type VRF

  • In this system, multiple indoors are connected with single outdoor. But it is not necessary that indoors should be same. It can be different like floor mounted, ceiling mounted, cassette unit, etc.
  • It is also known as the two-pipe system because outdoor has two pipelines - one is the liquid line and another is the suction line.
  • The line in which liquid refrigerant flows from the condenser to evaporator, that line is known as a liquid line.
  • The line in which vapor refrigerant flows from the evaporator to compressor, that line is known as a suction line.
  • In this system, a separation tube and inverter compressors are used.
  1. A separation tube helps to joint more than one indoors in a single liquid line/suction line.
  2. While the inverter compressor controls its rpm as per load, hence power consumption is less.

Refrigeration cycle of Cooling type VRF/VRV:

Refrigeration cycle of cooling type VRF

Let's start with the compressor. It compresses the low-temperature vapor refrigerant which comes from the evaporator and converts into high-temperature vapor refrigerant. This high-temperature vapor refrigerant flows into the condenser and rejects the heat to the atmosphere, hence high-temperature vapor refrigerant gets converted into a hot liquid refrigerant. These hot liquid refrigerants first go to the first expansion valve. EEV will pass refrigerant to the evaporator as per load and the remaining refrigerant will flow to the next expansion valve. When hot liquid refrigerant pass-through expansion valve, it changes its property and converts into the low-temperature liquid refrigerant and flows to the evaporator. The evaporator absorbs heat from the room and converts into vapor refrigerant and flows to the compressor and the cycle continues.

Click here to know the basic refrigeration cycle working.

VRV Part 1-Click here

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