Dehumidifier

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dehumidifier

[‚dē·yü′mid·ə‚fī·ər]
(mechanical engineering)
Equipment designed to reduce the amount of water vapor in the ambient atmosphere.

Dehumidifier

A mechanical device that removes water vapor in the air inside a building, by lowering it below the dew point.

Dehumidifier

Equipment designed to reduce the amount of water vapor in the atmosphere. There are three methods by which water vapor may be removed: (1) the use of sorbent materials, (2) cooling to the required dew point, and (3) compression with aftercooling.

Sorbents are materials which are hygroscopic to water vapor. Solid sorbents include silica gels, activated alumina, and aluminum bauxite. Liquid sorbents include halogen salts such as lithium chloride, lithium bromide, and calcium chloride, and organic liquids such as ethylene, diethylene, and triethylene glycols and glycol derivatives.

Solid sorbents may be used in static or dynamic dehumidifiers. Bags of solid sorbent materials within packages of machine tools, electronic equipment, and other valuable materials subject to moisture damage constitute static dehumidifiers. A dynamic dehumidifier for solid sorbent consists of a main circulating fan, one or more beds of sorbent material, reactivation air fan, heater, mechanism to change from dehumidifying to reactivation, and aftercooler.

The liquid-sorbent dehumidifier consists of a main circulating fan, sorbent-air contactor, sorbent pump, and reactivator including contactor, fan, heater, and cooler. This unit will control the effluent dew point at a constant level because dehumidification and reactivation are continuous operations with a small part of the sorbent constantly bled off from the main circulating system and reactivated to the concentration required for the desired effluent dew point.

A system employing the use of cooling for dehumidifying consists of a circulating fan and cooling coil. The cooling coil may use cold water obtained from wells or a refrigeration plant, or may be a direct-expansion refrigeration coil. In place of a coil, a spray washer may be used in which the air passes through two or more banks of sprays of cold water or brine, depending upon the dew-point temperature required.

Dehumidifying by compression and aftercooling is used when the reduction of water vapor in a compressed-air system is required. This is particularly important, for example, if the air is used for automatic control instruments or cleaning of delicate machined parts. The power required for compression systems is so high compared to power requirements for dehumidifying by either the sorbent or refrigeration method that the compression system is not an economical one if dehumidifying is the only end result required.

dehumidifier

Any device or apparatus for removing moisture from air.
References in periodicals archive ?
One other point on dehumidifiers was made to PS during a recent visit to Ft Bragg by SPC Bret Pchelka of MATES:
The `smart control' monitors the use of domestic appliances by measuring the humidity and temperature of the home and adjusts the dehumidifier to operate at its optimum level.
The Honeywell DH45W, DH50W and DH70W Dehumidifiers include detachable water tanks with full tank alert and automatic shut-off; smart digital humidistat controls that sense room humidity and activate dehumidification as needed to maintain pre-set humidity levels; full-feature digital controls with electronic display; and an operating temperature as low as 41AF (5AC).
There are 22 basic models in room air and five models in dehumidifiers.
He suggested that we might look at an Aprilaire dehumidifier.
Dehumidifiers grow to 25, 40 and 50 pints in black and white.
The majority of purchases of air cleaners, humidifiers, and dehumidifiers are prompted by health concerns, and for this reason allergy and asthma sufferers, as well as parents of young children, are essential to the market.
This study also includes revenue forecasts, market share information for portable as well as whole-house humidifiers and dehumidifiers.
Affected dehumidifiers have front-mounted water buckets and serial numbers behind the buckets, beginning with QG, QH, QJ, QK or QL.
Consumers should not return the recalled dehumidifiers to the retailer where purchased.
Description: This recall involves 30, 40, 50, 65-pint dehumidifiers with the GE brand name.
In dehumidifiers, Whirlpool has improved its Energy Star Low Temp models with an electronic Ultra Low Temp feature said to function down to 40 degrees.