Air conditioning system that allows for individual control of spaces
Not to be confused with chiller.
"VRV" redirects here. For the media streaming service, see VRV (streaming service). For the station code VRV, see Viravada railway station.
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. This refrigerant is conditioned by one or more condensing units (which may be outdoors or indoors, water or air cooled), and is circulated within the building to multiple indoor units.[2] VRF systems, unlike conventional chiller-based systems, allow for varying degrees of cooling in more specific areas (because there are no large air handlers, only smaller indoor units), may supply hot water in a heat recovery configuration without affecting efficiency,[3] and switch to heating mode (heat pump) during winter without additional equipment, all of which may allow for reduced energy consumption. Also, air handlers and large ducts are not used which can reduce the height above a dropped ceiling as well as structural impact as VRF uses smaller penetrations for refrigerant pipes instead of ducts.[4]
^Cite error: The named reference thornton201212 was invoked but never defined (see the help page).
^"Introduction of Heat Recovery Chiller Control and Water System Design" (PDF). Retrieved 2024-01-13.
^Felt, Justin (2017-12-21). "The Emergence of VRF as a Viable HVAC Option". Buildings. Endeavor Business Media. Archived from the original on 2023-02-10.
and 23 Related for: Variable refrigerant flow information
Variablerefrigerantflow (VRF), also known as variablerefrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. Similar...
helps to secure the process while providing greater efficiency. Variablerefrigerantflow (VRF) VRF units are very popular cooling or reversible systems...
product line for HVAC controls, from the operator's workstation to small variable air volume (VAV) controllers. Automated Logic Corporation and Delta Controls...
surface gradients are small. Darcy's law is used for flow in porous media, and works with variables averaged over several pore-widths. In rotating systems...
be used to control the speed of the compressor motor to drive variablerefrigerantflow in a refrigeration or air conditioning system to regulate system...
A refrigerant is a working fluid used in the refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated...
also invented by Daikin in 1982. Both were first sold in Japan. Variablerefrigerantflow systems when compared with central plant cooling from an air handler...
nonflammable, low toxicity gases or liquids which have generally been used as refrigerants and as aerosol propellants. These include chlorofluorocarbons and hydrofluorocarbons...
home. A gaseous refrigerant is compressed so its temperature rises. When operating as a heater in cold weather, the warmed gas flows to a heat exchanger...
scroll pump and scroll vacuum pump) is a device for compressing air or refrigerant. It is used in air conditioning equipment, as an automobile supercharger...
or refrigerant metering device (RMD) restricts the flow of the liquid refrigerant causing a pressure drop that vaporizes some of the refrigerant; this...
control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the...
over-cooling. 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...
flow of air over the radiator's surface. Common types of heat exchanger flows include parallel flow, counter flow, and cross flow. In parallel flow,...
humidity control; a ground-source heat pump system (GSHP); and variablerefrigerantflow systems with heat recovery. The building also serves as a live...
used to achieve below-ambient temperature, is more commonly known as refrigerant. Air is a common form of a coolant. Air cooling uses either convective...
This type of compressor can compress a wide range of gases, including refrigerant, hydrogen, and natural gas. Because of this, it finds use in a wide range...
component in a heat pump, that changes the direction of refrigerantflow. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from...
panels A parallel all air variable-air-volume (VAV) systems Packaged unitary water source heat pumps VariableRefrigerantFlow (VRF) systems Fan coil units...
hoods can affect well-being, and may even contribute to hearing loss. Variable speed fans are generally noisier at higher speeds and different models...
combination of refrigerant and absorbent is used. The most common combinations are ammonia (refrigerant) and water (absorbent), and water (refrigerant) and lithium...
describing the "process" of refrigerantflow through an HVACR unit, whether it is a packaged or split system. Heat naturally flows from hot to cold. Work is...
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