First chilled container
Scottish professor William Cullen designed a small device that was able to remove the heat from a container using gas, leaving the container chilled.
The refrigerator is considered to be an absolute necessity in most homes in the developed world. But still around 25% of people in the world do not have access to fridges. Having access to a fridge allows families to reduce the frequency of their shopping trips, to prepare food at times that fit in with work commitments and allows luxuries such as cold drinks in warm weather.
Key Events
UN Sustainable Development Goals
In the 1970s scientists discovered that the CFC gasses used as coolants in refrigeration were causing a hole in the ozone layer. Governments began regulating the use of CFCs however millions of fridges all over the world already contained them and when the fridges broke down or were scrapped, the CFCs escaped into the atmosphere.
From the 1980s onwards, fridges began being made with gasses such as hydroflurocarbons or HFCs which do not deplete the ozone layer. Unfortunately, HFCs are greenhouse gasses, meaning that they trap heat in our atmosphere and contribute to global warming. The Australian Government is currently phasing out the use of these gasses. Careful capture and disposal of HFCs so that they do not escape into the atmosphere is considered to be one of the biggest challenges in the battle against climate change1.
The other big issue with fridges is that they run 24/7 meaning that they are constantly consuming electricity. That wouldn’t be such a problem if all of our electricity came from sustainable or renewable sources but in Australia only 23% of our energy comes from renewable sources. That means that the electricity our fridges use is very likely harming the environment through mining and through the generation of greenhouse gasses.
The concepts in the show also link to the following UN Sustainable Development Goals
- #5 Gender Equality
Access to refrigeration frees up women who are usually responsible for shopping and meal preparation in developing nations. By enabling a reduced frequency of shopping and food preparation, women are better able to participate in education and the workforce.
- #12 Responsible Consumption and Production
Responsible consumption involves ensuring that you choose a fridge that is the minimum size and uses the least power for the needs of your family.
Responsible production is looking at alternatives to the currently environmentally damaging gasses that are used as cooling agents in fridges.
- #13 Climate Action
Careful management of discarded refrigerators so that the CFC and HFC gasses are not released into the atmosphere are necessary to reduce the impact of fridges on climate change.
Challenge
Design a fridge of the future.
- What features would it have to make it more sustainable and better for the environment?
- Ask yourself whether there are ways of keeping things cold without needing to use electricity or if there are alternative ways of producing electricity to power a fridge at home?
Resources
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