Mechanical Ventilation and Equipment
نویسنده
چکیده
Mechanical ventilation systems for controlling conditions in individual zones can move a constant or variable supply of conditioned air to handle all or some of the heating and cooling loads. They are classified as all-air, air-water, and all-water systems. All-air systems include single-duct, dual-duct and multizone. The systems can be designed to operate at Constant Air Volume (CAV) or Variable Air Volume (VAV). Air-water and all-water systems are categorized as two-, threeand four-pipe. The Air Handling Unit (AHU) is the main air conditioning and treatment equipment. A typical AHU consists of a single volume unit with a supply fan, heating coil, cooling coil, humidifier where necessary, filters, mixed air economizer dampers, and sound attenuator. The air distribution is a key element for the successful operation of central systems to deliver the air to the conditioned spaces in an efficient way, satisfying the indoor environmental conditions as economically as possible. The air is then distributed by the ductwork and is delivered by the air-diffusion outlets. Proper circulation and exhaust must satisfy the indoor environmental quality. Mechanical ventilation systems provide great flexibility for controlling the indoor conditions, if properly designed, installed, commissioned, operated, and maintained. Proper controls can optimize their use, enhance flexibility, and improve energy efficiency. On the other hand, poor design, installation, and performance can lead to serious Indoor Air Quality (IAQ) problems, and cause thermal and acoustical discomfort, with a high energy cost.
منابع مشابه
[Noninvasive ventilation in pediatrics].
OBJECTIVE To introduce the notion of noninvasive mechanical ventilation as an alternative for invasive ventilation in children, describing advantages and disadvantages, indications, and the process of equipment installation. SOURCE OF DATA Literature review through PubMed/Medline, using as source articles focusing on noninvasive ventilation in pediatric populations, as well as consensus state...
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