Frost-free


Frost-free

:"Certain bibcocks (sillcocks) are also known as frost frees."

A frost free (also called Auto-defrost or no-frost) refrigerator or freezer incorporates technology to keep the unit from icing up.

Mechanism

The mechanism on a refrigerator involves letting the cooling element heat up for a short period, melting any ice that has formed upon it and having it drain through a collecting duct at the back of the unit.

Inside the freezer, dry air is circulated around the cabinet using fans (this is why such kind of appliances are also called "dynamic", whereas non-frost free ones are called "static").Instead of the traditional cooling elements assembled within all the freezer liner, those of a frost-free system are compact and separated from the main cabinet space, allowing them to be heated for short periods to dispose of any ice forming.

Application

While this technique was originally and is mostly applied to freezer compartments, it can also be used for fridge compartments.A combined fridge/freezer which applies the frost free system to the freezer compartment only is usually called "partial" frost free", while one which also applies it to the fridge compartment is called "total" frost free". The latter features an air connection between the two compartments, with the air passage to the fridge compartment regulated by a damper. In such a way, a controlled minor part of the dry and fresh air coming from the dynamic cooling element located within the freezer can reach the refrigerator.

Some newer fridge/freezer models have built-in electronics that monitor how many times each door is opened and could also average the door open time which will automatically adjust defrost scheduling, therefore optimizing power dissipation.

Advantages of frost free

*No need to manually defrost the ice buildup
*Food packaging is easier to see because it's clear of frost
*Most frozen foods don't stick together
*Smells are limited, especially in total frost free appliances, since the air is constantly circulating

Disadvantages of frost free

*The system is more expensive to run due to higher power consumption
*A safety device is required to be connected with the heating element, due to the high instant-power values that can be reached
*The temperature of the freezer contents rises during the defrosting cycles
*On hot humid days condensation will sometimes form around the refrigerator doors

In laboratories, frost-free freezers must not be used to store certain delicate reagents such as enzymes, because the temperature cycling can degrade them. In addition, water can sublimate out of containers that do not have a very tight seal, altering the concentration of the reagents.

External links

* [http://home.howstuffworks.com/question144.htm Frost-free page on howstuffworks]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • frost-free — (frôstʹfrēʹ, frŏstʹ ) adj. Requiring little or no defrosting: a frost free refrigerator. * * * …   Universalium

  • Frost-free — Frost free, a. not accumulating frost; used especially of refrigerators with an automatic defrost cycle such that the freezer compartment remains free of ice without need for a manual defrosting. [PJC] …   The Collaborative International Dictionary of English

  • frost-free — adj. free of a buildup of ice without defrosting a frost free freezer …   Useful english dictionary

  • frost-free — /ˈfrɒst fri/ (say frost free) adjective (of a refrigerator) never needing to be defrosted …   Australian English dictionary

  • Frost-free-Technologie — Die auf unter 18°C gekühlte Luft wird durch Ventilation in den Gefrierraum geleitet. Dabei wird der Luft Feuchtigkeit entzogen, die als Tauwasser außerhalb des Geräts verdunstet. Dadurch bildet sich kein Reif auf Lebensmitteln und im Inneren.… …   Wörterbuch für Hausgeräte

  • frost free refrigerator — Refrigerated cabinet which operates with an automatic defrost during each cycle …   Dictionary of automotive terms

  • Free verse — is a term describing various styles of poetry that are written without using strict meter or rhyme, but that still are recognizable as poetry by virtue of complex patterns of one sort or another that readers will perceive to be part of a coherent …   Wikipedia

  • Frost, Robert — ▪ American poet Introduction in full  Robert Lee Frost  born March 26, 1874, San Francisco, California, U.S. died January 29, 1963, Boston, Massachusetts  American poet who was much admired for his depictions of the rural life of New England, his …   Universalium

  • Frost diagram — A Frost diagram is an Oxidation State Free Energy Diagram (O.S.F.E), also known as an Eh pH diagram, due to its axial labellings, and is used in electrochemistry to illustrate the relative stability of a number of different oxidation states of a… …   Wikipedia

  • Frost Art Museum — Infobox Museum name= Frost Art Museum Florida International University. imagesize= 300x250 map type= latitude= longitude= established= 1977 location= Florida International University Miami, Florida, United States type= Art museum, Sculpture park… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.