Half a croissant, on a plate, with a sign in front of it saying '50c'
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freezer defroster

dessicants solve one of life's problems
  [vote for,

I have a large freezer, and despite the fact that it is supposedly unnecessary to defrost it, it develops thick frost at the coldest parts. The solution to this could be very simple. The frost is just moisture in the air condensing (well, desublimating actually) out and freezing. The moisture probably mostly comes from opening and closing the door, if it were removed from the air in the freezer quickly before it desublimated there would be no frost. So, the air in the freezer should be constantly circulated through silica gel, calcium chloride or lithium bromid dessicant. The dessicant could be regenerated.
brewer, May 25 2004

Freezer Defroster http://www.veggiefu...m/images/burner.jpg
[DrCurry, Oct 05 2004]


       "The dessicant could be regenerated" during the defrost cycle.   

       Shouldn't the majority of moisture in the air be condensed when the air circulates through the evaporator?
Gromit, May 25 2004

       not quite sure what you mean by "circulating through the evaporator". My freezer is cooled inside, and I don't think any significant amount of air is circulated anywhere. The frost forms where the evaporator plates/tubes whatever are closest. Furthermore as for regenerating the dessicant I was more thinking that the cold air would stop circulating through it for a short time during which the dessicant would be heated to high temperature and air from the outside circulated through it. After that, it would cool for a while, and then cold air could be circulated through it again.
brewer, May 25 2004

       A quick Google search reveals that commercial freezers use desiccants and dehumidifiers of various kinds, so it seems reasonable enough to extend the technology to home use.
DrCurry, May 25 2004

       Why not use bags of desiccant to keep moisture out of your freezer? You don't need to circulate the air and you won't be using potentially harmful materials like calcium chloride & lithium bromide. Just place the food-grade bags on the freezer shelves and replace them every month or so. Contact me at ibuckley@silgel.co.uk for more info
buckley, Jul 05 2004


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