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 ?
Dehumidifier market is driven by factors such as increase in technological developments and construction activities worldwide.
Or, if you just want to get started on a possible solution, buy dehumidifiers. Although you already replaced your basement unit, adding one or more upstairs or investing in a whole-house system could make a huge difference.
The temperature of air coming out of the dehumidifier is 2-9degC higher than the temperature of the sucked air.
If vapor compression dehumidifiers are the only technology available, develop a cycle of warming the ice temperature and air temperature to increase the dehumidifier capacity while reducing overnight frosting.
The coefficient of performance--the ratio of heat output to the amount of energy input of the dehumidifier's heat pump--has improved to 1.85 I/kWh, which ultimately eliminates energy costs by one-third from its aforementioned state.
John has used his years of experience to draw up a Damp Britain battle plan for affected homes, offering 10 top tips, in conjunction with Ebac, a leading British manufacturer of dehumidifiers When you are cooking, cover pans as often as possible to keep the steam in.
Product coverage: Air Purifiers, Cooling, Dehumidifiers, Humidifiers, Other Air Treatment Products.
Screwfix's WDH-122H-12R 12ltr Dehumidifier (PS139.99) is a brilliant buy because not only is it compact, affordable and quiet, it also sucks up moisture quickly and efficiently.
D2676 portable dehumidifier PS39.99 (rrp PS49.99) save a further PS10 - buy two for only PS70 d3812 large portable dehumidifier PS49.99 (rrp PS69.99) save a further PS10 - buy two for only PS90
Get a 30- to 60-pint dehumidifier. Industrial supply houses like McMaster-Carr or Grainger and large home supply outlets have a wide selection.
Please send me Qty Price total DEHUM3 - Neostar High Performance Dehumidifier PS149.95 (SAVE PS50) RRP PS199.95 Postage and packing FREE 12-montH GUarantee Grand total Title (Mr/Mrs/Miss/Ms) .............
So simple to operate: just place the dehumidifier in any room affected by damp, plug in and that's it.