Transcript The inner workings of old and modern refrigerators

The Inner
Workings of
Old and
Modern
Refrigerators
Eric Abercrombie
Levi Algozino
E-Design 100 Section 9
Pennsylvania State University
http://upload.wikimedia.org/wikipedia/commons/3/36/ExpensiveR
efrigerators.JPG
Refrigeration is the process of removing heat
from an enclosed space generally by evaporating
and condensing a substance (usually a CFC gas).
http://firstcoastac.com/faq/freon/
Several Types of Gases have been used in
refrigeration systems as chemists discover
more efficient systems.
Almost all have
been phased
out due to
harmful effects
to either the
surrounding
area or the
o-zone layer. http://upload.wikimedia.org/wikipedia/common
http://www.gcsescience.com/Ammonia-Molecule.gif
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ns/thumb/3/34/Sulfur_dioxide.svg/467pxSulfur_dioxide.svg.png
s/thumb/3/30/Methyl_Chloride.svg/261pxMethyl_Chloride.svg.png
Cooling both a freezer and a refrigerator
involves the coolant previously mentioned
(usually Freon), getting put through a
short process.
1:
2:
3:
4:
5:
http://www.realsimple.com/food-recipes/toolsproducts/appliances/how-does-refrigeratorwork-00100000087962/index.html
Compression
Release of heat
Expansion
Cooling of unit
Back to compression
The interior refrigeration system
Heat
absorbed
Substance vaporized
Substance
liquefied
http://www.energyquest.ca.gov/how_it_works/refrig
erator.html
If a temperature is
set on a refrigerator,
the cycle just
continues until the
desired temperature
is reached.
http://www.tmchallcrest.com/fridge-freezer-indicators.php
When a special
thermometer
detects that the
fridge has
reached the
proper
temperature, it
simply shuts off
the motor and
the refrigeration
cycle is halted.
Works Cited:
 http://www.energyquest.ca.gov/how_it_works/refrigerator.html
 http://firstcoastac.com/faq/freon/
 http://inventors.about.com/library/inventors/blrefrigerator.htm
 http://www.realsimple.com/food-recipes/tools-products/appliances/howdoes-refrigerator-work-00100000087962/index.html
 http://home.howstuffworks.com/refrigerator4.htm