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[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 can be thought of as larger multi-split systems) were also invented by
Zone control (single zone or multi zone air handlers) Fan location (draw-through or blow-through) Direction of outlet air flow (front, up, or down) Package model (horizontal or vertical) But, the first method is very usual in HVAC market. In fact, most of the company advertise their products by air handling unit applications: Normal; Hygienic
While single-zone constant air volume systems typically do not have these, multi-zone systems often have terminal units in the branch ducts. Usually there is one terminal unit per thermal zone . Some types of terminal units are VAV boxes (single or dual duct), fan-powered mixing boxes (in parallel or series arrangement), and induction terminal ...
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 where ductwork is not feasible or where the space conditioning efficiency is of prime concern. [33]
split system A split system is the combination of an outdoor unit and an indoor unit. This is the most common type of system. superheat The number of degrees a vapor is above its boiling point at a specific pressure. subcooling
A central vacuum cleaner (also known as built-in or ducted) is a type of vacuum cleaner appliance installed into a building as a semi-permanent fixture. Central vacuum systems are designed to remove dirt and debris from homes and buildings by sending dirt particles through piping installed inside the walls to a collection container inside a ...
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