[escepticos] alguien mas se ha preocupado por los frigorificos

[ungil@...>]

Hola, hola.

Acerca del tema aquel de los frigoríficos/neveras/freezers,
he encontrado una única referencia en la red, que ofrece la misma 
explicacion que propuso inicialmente Borja.

Saludos dominicales,
			Carlitos

http://www.last-word.com/lastword/answers/lwa211physical.html

s t i c k i n g     d o o r s

q. My fridge door is kept shut by a magnetic strip in a
flexible plastic seal. If I attempt to open the door soon after
closing it, it seems to be held shut by a vacuum for a few
seconds. Why is this? 

                                          CHRISTOPHER NUNN 
                                          East Grinstead
                                          West Sussex

_______________________________________________________

a. Fridge doors stick in this way because opening the door allows
some of the cold air to flow out of the bottom of the fridge. If you
stand in bare feet at the door of an open fridge you will feel this cold,
dense air. This allows warmer air at room temperature into the top
of the fridge.

When the fridge is closed again, this new air cools and contracts,
creating a partial vacuum and making the door seem to stick. The
effect is most noticeable with a freezer compartment, because the
lower temperature of the freezer creates an even greater partial
vacuum than a fridge does when air at room temperature is
introduced as the air undergoes even more contraction.
                                          
I have often wondered if the freezing of the water vapour contained
in this introduced air adds to the effect inside the freezer
compartment. Notice how ice gradually builds up in the
compartment of non-defrosting freezers.

To open the freezer door when the temperature contrast between
room temperature and freezer temperature is large (on, say a
particularly hot day), it is sometimes necessary to prize open the
plastic seal a little to allow some air in to equalise the partial
vacuum in the freezer compartment.

The partial vacuum created by opening the door soon passes,
however, because the door seals are not airtight and the air
pressures inside and outside the fridge are equalised by outside air
leaking into the fridge compartments. 
                  
This means that if you had no idea what the original question was
referring to, you should check the quality of the seals on your fridge
door--they may be leaking a lot of cold air and consequently
making the fridge work harder than it should have to. 

                                          PAUL BISHOP
                                          Monash University
                                          Victoria