This document provides information about food storage and refrigeration. It discusses how people preserved food before refrigerators were invented and how food is stored on both small and large scales today. It also addresses how refrigerators work, their environmental impact, and more efficient refrigerator designs like solar powered models. The document aims to educate students on these topics and has discussion questions and learning objectives. It also provides several links for further reading and details how to submit an entry for a related contest by May 7th, 2013.

1. Food storage and refrigeration
4th - 8th grade Most homes in the world today have refrigerators. Can you
figure what people did before refrigerators were invented?
Learn and explain how food storage is done at homes and in
large scale storage facilities.
Time required: 4-8 hours Last date for contest submission: May 7, 2013.
(power point or word document or create a Google site page
Refrigerator uses maximum power in the typical household. If you have the model of early 1990s, chances
are it's using two to three times as much energy as current models. In fact, the fridge may account for as
much as one-fifth of your annual electricity costs, according to Consumer Reports where 2 billion people
around the globe have no access to electricity in the first place [NASA]
 Can you relate availability of food storage in developed countries and
Learning Objectives compare it with developing world?
•Working principle of conventional  How does refrigerator keep it cool inside and why do we need it to be cool?
refrigerator and purpose of
refrigeration.  Do you know how much power your home refrigerator uses?
•Which other appliance do you
think works on the same  How do you reduce energy usage?
principle? Why do you think so?
Which other appliance can you
use instead of refrigerator ?
•If you do not have refrigerator,
how will you keep the food fresh?
•How does a conventional
refrigerator affect the
environment? Suggest some ways
to reduce the problem.
•Explain how eco-fridge and solar
powered refrigerators work.
http://home.howstuffworks.com/refrigerator2.htm
https://www.youtube.com/watch?v=DhqBH1uxtRk
http://www.ck12.org/physics/Cooling-Systems/lesson/Cooling-
Systems/
http://www.buzzle.com/articles/solar-powered-refrigerators.html
http://www.thedailygreen.com/going-green/tips/refrigerator-door-
wastes-energy
http://home.howstuffworks.com/solar-powered-refrigerator1.htm
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