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Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller -based systems.
Variable refrigerant flow (VRF) VRF units are very popular cooling or reversible systems (heating and cooling). They combine the flexibility for building owners and occupants alike, with energy efficiency, high comfort, and ease of installation, without compromising on reliability. VRF systems already extensively use inverter technology. [3]
Carbon12 uses an electric LG Variable Refrigerant Flow system (VRF), an interconnected system that shares the load, making it efficient. [15] The waste produced during the construction process was less due to the modular construction but still recycled and used as biofuel. [22]
The air blower's flow rate is variable. For a single VAV air handler that serves multiple thermal zones, the flow rate to each zone must be varied as well. Simple VAV terminal unit. A VAV terminal unit, [9] often called a VAV box, is the zone-level flow control device.
A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.
VRF may refer to: Variable refrigerant flow, for heating and cooling; Verifiable random function, in cryptography; Virtual routing and forwarding; Vitiligo Research ...
The thermostat controls the fan speed and/or the flow of water or refrigerant to the heat exchanger using a control valve. Due to their simplicity, flexibility, and easy maintenance, fan coil units can be more economical to install than ducted 100% fresh air systems (VAV) or central heating systems with air handling units or chilled beams. FCUs ...
Air conditioning systems Room air conditioners (marketed as Mitsubishi Mr. Slim Room Air Conditioner and Mitsubishi Kirigamine) Package air conditioners (Marketed as Mitsubishi Mr. Slim Packaged Air Conditioner) Variable refrigerant flow (VRF) systems (marketed as Mitsubishi CITY MULTI) EcoCute (marketed as Ecodan or DIAHOT) Ventilators; Air ...