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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]
The first mini-split system was sold in 1961 by Toshiba in Japan, ... The lower start-up power of VRF's DC inverter compressors ... Commercial and central systems, VRF:
Midea Group (Chinese: 美的集团; pinyin: Měidì Jítuán; Jyutping: mei5 dik1 zaap6 tyun4) is a Chinese electrical appliance manufacturer, headquartered in Beijiao town, Shunde District, Foshan, Guangdong and listed on Shenzhen Stock Exchange since 2013.
Carrier was founded in 1915 as an independent company manufacturing and distributing HVAC systems, and has since expanded to include manufacturing commercial refrigeration and food service equipment, and fire and security technologies.
Toshiba has had a range of products and services, including air conditioners, [118] consumer electronics (including televisions and DVD and Blu-ray players), [119] control systems (including air-traffic control systems, railway systems, security systems and traffic control systems), [120] electronic point of sale equipment, [121] elevators and ...
Air volume regulator. Variable air volume (VAV) is a type of heating, ventilating, and/or air-conditioning system.Unlike constant air volume (CAV) systems, which supply a constant airflow at a variable temperature, VAV systems vary the airflow at a constant or varying temperature.
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.