Defogger

Defogger

A defogger, demister, or defroster is a system to clear condensation and thaw frost from the windshield, backglass, and/or side windows of a motor vehicle. For primary defogging, heat is generally provided by the vehicle's engine coolant via the heater core; fresh air is blown through the heater core and then ducted to and distributed over the interior surface of the windshield by a blower. This air is in many cases first dehumidified by passing it through the vehicle's operating air conditioning evaporator. Such dehumidification makes the defogger more effective and faster, for the dried air has a greater capacity to absorb water from the glass at which it is directed. Secondary defoggers, such as those used on a vehicle's backglass and/or side view mirrors, often consist of a series of parallel linear resistive conductors in or on the glass. When power is applied, these conductors heat up, thawing ice and evaporating condensation from the glass. These conductors may be composed of a silver-ceramic material printed and baked onto the interior surface of the glass, or may be a series of very fine wires embedded within the glass. The surface-printed variety is prone to damage by abrasion, but can be repaired easily with a conductive paint material. Resistive-heat defoggers are usually equipped with an automatic timer to operate for a set time period of 10 to 15 minutes before switching off. This is because most defogging is achieved within that timeframe, after which the vehicle's heater has usually brought the interior of the vehicle to a warm enough temperature that the fog does not recur. However, if this is not the case, the driver may activate the system again once it has timed out. There is usually a telltale on the vehicle dashboard, often on the defogger switch, to let the driver know the system is active.


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Look at other dictionaries:

  • defogger — 1966, from agent noun from DE (Cf. de ) + FOG (Cf. fog) …   Etymology dictionary

  • defogger — [dē fôg′ər, dēfäg′ər; di fôg′ər, difäg ər] n. an apparatus for clearing condensed moisture, as from a car window defog vt. defogged, defogging …   English World dictionary

  • defogger — noun see defog …   New Collegiate Dictionary

  • defogger — /dee fog euhr, faw geuhr/, n. defroster (def. 2). [DEFOG + ER1] * * * …   Universalium

  • defogger — noun something or someone that defogs …   Wiktionary

  • defogger — de|fog|ger [ di fagər ] noun count or uncount AMERICAN the part of a car that blows air onto the windows to keep them clear ╾ de|fog verb transitive …   Usage of the words and phrases in modern English

  • defogger — n. device which removes fog; someone or something that clarifies …   English contemporary dictionary

  • defogger — de·fog·ger …   English syllables

  • defogger — An electric or hot air device to remove the fog or ice from both the inside and outside of the windshield, backlight (i.e., rear window) or even mirrors. Some are designed to remove fog from the side windows …   Dictionary of automotive terms

  • defogger — noun see defog …   Useful english dictionary

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