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DOAS air handling unit with heat recovery wheel and passive dehumidification. A dedicated outdoor air system (DOAS) is a type of heating, ventilation and air-conditioning system that consists of two parallel systems: a dedicated system for delivering outdoor air ventilation that handles both the latent and sensible loads of conditioning the ventilation air, and a parallel system to handle the ...
An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning system. [1] An air handler is usually a large metal box containing a blower , furnace or A/C elements, filter racks or chambers, sound attenuators , and dampers . [ 2 ]
The five counties of Hawaii on the Hawaiian Islands enjoy somewhat greater status than many counties on the United States mainland. Counties in Hawaii are the only legally constituted government bodies below that of the state. No formal level of government (such as city governments) exists below that of the county in Hawaii.
Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). [2] Standard mixing ventilation may be better suited for smaller spaces where air quality is not as great a concern, such as single-occupant offices, and where the room height is not tall (e.g., lower than 2.3 meters [7.5 feet]).
Ahupuaʻa is derived from Hawaiian language ahu, meaning “heap” or “cairn,” and puaʻa, pig. The boundary markers for ahupuaʻa were traditionally heaps of stones used to put offers, often a pig, to the island chief. Each ahupuaʻa was divided into smaller sections called ʻili, and the ʻili were divided into kuleana.
Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...
UFAD systems rely on air handling units to filter and condition air to the appropriate supply conditions so it can be delivered to the occupied zone. While overhead systems typically use ducts to distribute the air, UFAD systems use the underfloor plenum formed by installation of a raised floor.
Aerial view of Oahu with freeways and highways; 3D computer-generated image Fly-around tour of the island Oahu (/ oʊ ˈ ɑː h uː / oh-AH-hoo; Hawaiian: Oʻahu pronounced) is the third-largest and most populated island of the Hawaiian Islands and of the U.S. state of Hawaii. [1]