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Variable Refrigerant Flow (VRF) and Variable Refrigerant Volume (VRV)

VRF is HVAC equipment. VRF’s use refrigerant as the cooling and heating medium. This refrigerant is conditioned by a single outdoor condensing unit, and is dispersed within the building to multiple Indoor fan coils.

VRFs are typically connected with an AC inverter which adds a DC inverter to the compressor in order to maintain variable motor speed and thus variable refrigerant flow rather than just on/off process. By operating at variable speeds, VRF units work only at the desired rate letting for considerable energy savings at partial-load conditions. Heat recovery system UK allows individual indoor units to heat or cool as necessary, while the compressor load benefits from the internal heat recovery. Energy savings of up to 55% are forecasted over similar unitary equipment. This also results in better control of the building's interior temperature by the building's occupiers.

Variable refrigerant flow come in two system plan, 2 pipe and 3 pipe systems. In a Two pipe system all of the regions must either be all in cooling or all in heating. A three pipe Heat Recovery systems has the ability to heat certain zones while others require cooling. In this case the heat removed from the region requiring cooling is put to use in the region requiring heating. This is made achievable because the heating units are operative as a condenser providing sub-cooled liquid back into the line that is used by for cooling. While the Three pipe system has a higher initial cost, it allows for region better-quality thermal control of a premises and overall better efficiencies.

VRV was initially invented by “Daikin” in year 1982; VRV’s are very similar to VRF’s in functioning. The latest version of VRV available in market currently is version four (4) delivering the ultimate in climate comfort, energy efficiency and control. Each indoor unit uses an electronic liquid expansion valve (LEV) to control its refrigerant supply to tie the demand of the space it serves. The external unit also varies its output to match the common demands of the indoor units it serves. Thus, at any point in a system there will be a variable volume of refrigerant flowing. Because Daikin’s VRV systems circulate only the amount of refrigerant volume required at any time (hence the name ‘Variable Refrigerant Volume’), different regions can simultaneously enjoy different climate control settings. This means that VRV offers a flexible solution for an entire building, which minimizes energy consumption while putting building users firmly in control.