The Importance of Air Conditioning and Refrigeration

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One of the greatest engineering achievements of the 20th century was the development of air conditioning and refrigeration. Air conditioning is the heating, cooling, dehumidification, humidification, ventilation, and sterilization of air. The refrigeration process removes heat from an enclosed space to reduce and maintain the temperature for the contents of that space. While air conditioning regulates the air in a large building, refrigeration solely cools and is generally used in a smaller space. Both innovations make the human population, including myself, significantly more comfortable and happy. The most common, and probably most important, use for refrigeration is food preservation. It used to be that people had to go to a market every day and buy fresh groceries before they perished. Early methods of food preservation such as cold cellars and salting were expensive, difficult to regulate, and didn’t maintain the same quality as what we are used to today. After the discovery of bacteria the importance of refrigeration became clear. Low temperatures slow chemical and biological processes including bacterial growth which spoils food. Modern refrigeration provides an environment too cold for harmful bacteria to flourish, keeping people healthy. With contemporary refrigeration units I can buy lunch meat on Sunday and have it last all week long. A reliable method for keeping foods cold means I have to shop less frequently. It also allows for foods to be frozen and eaten out of season. Even if I ran out of my frozen fruits and vegetables, I could also buy out-of-season edibles from a place where they are in-season. Foods can be refrigerated and transported across the country and across the world. This means that I can now have a more diverse diet than what is grown in my area. Current refrigeration technology has changed our diets and lifestyles to be

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