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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.
Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by Daikin in 1982. Both were first sold in Japan. [68]
The acquisition was expected to expand Daikin's presence in the United States and in duct-type and split-system air-conditioners, and was expected to make Daikin the world's largest maker of heating, ventilation and air-conditioning systems. [18] [needs update] [19]
AHT Cooling Systems is an Austrian company, active in both branches of industrial refrigeration and deep freezing. [1] Its main areas of business are fridges and deep freezers for supermarkets, ice cream freezers and bottle coolers. [2] [3] Daikin acquired AHT in 2019.
An alternative to packaged systems is the use of separate indoor and outdoor coils in split systems. Split systems are preferred and widely used worldwide except in North America. In North America, split systems are most often seen in residential applications, but they are gaining popularity in small commercial buildings. Split systems are used ...
R-410A was invented and patented by Allied Signal (later Honeywell) in 1991. [5] Other producers around the world have been licensed to manufacture and sell R-410A. [6] R-410A was successfully commercialized in the air conditioning segment by a combined effort of Carrier Corporation, Emerson Climate Technologies, Inc., Copeland Scroll Compressors (a division of Emerson Electric Company), and ...
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