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The Mitsubishi model was the first air conditioner with a cross-flow fan. [64] [65] [66] In 1969, the first mini-split air conditioner was sold in the US. [67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which
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.
Split systems are used where ductwork is not feasible or where the space conditioning efficiency is of prime concern. [33] The benefits of ductless air conditioning systems include easy installation, no ductwork, greater zonal control, flexibility of control, and quiet operation. [34]
Super Shift transmission levers in a Mitsubishi Cordia. The Super Shift transmission, also marketed as Twin-Stick, was a manual transaxle transmission developed by Mitsubishi Motors in the late 1970s and used in a limited number of the company's road cars, most of which were manufactured in the 1980s. It was unusual in that it had 8 forward ...