1/13/2024 0 Comments Best airflow case 2020A refrigerator set at 40 ☏ or below will protect most foods. Bacteria grow most rapidly in the range of temperatures between 40 and 140 ☏, the "Danger Zone," some doubling in number in as little as 20 minutes. When they have nutrients (food), moisture, and favorable temperatures, they grow rapidly, increasing in numbers to the point where some types of bacteria can cause illness. ![]() They are in the soil, air, water, and the foods we eat. As consumers, we should notice no difference. The old refrigerant known to most people as "freon," a tradename, was replaced with HFC 134a, a new refrigerant less injurious to the ozone and still just as effective in keeping food cold. In 1996, there was a change made in the type of refrigerant used to comply with the Regulatory Clean Air Act, Title 6. The science of refrigeration continues to evolve. Cooling wine via this method was recorded in 1550, as were the words "to refrigerate." The evolution to mechanical refrigeration, a compressor with refrigerant, was a long, slow process and was introduced in the last quarter of the 19th century. The intermediate stage in the history of cooling foods was to add chemicals like sodium nitrate or potassium nitrate to water causing the temperature to fall. Even today, ice is still manufactured for this purpose. As man became more industrialized and mechanized, ice was harvested from lakes and rivers or manufactured, stored, and transported to many countries. Later, ice was harvested in the winter to be used in the summer. He realized the cold temperatures would keep game for times when food was not available. In prehistoric times, man found that his game would last longer if stored in the coolness of a cave or packed in snow. ![]() But we are instantly reminded of its importance to our daily lives when the power goes off or the unit fails, putting our food's safety in jeopardy. These electric units are so commonplace today, we forget a refrigerator was once little more than a box with a block of ice used to supply a rather undependable source of cold air. Food Safety While Manually Defrosting a Refrigerator-FreezerĪ refrigerator is one of the most important pieces of equipment in the kitchen for keeping foods safe.Safe Handling of Foods for Refrigerating.Types of Bacteria in Refrigerated Foods.
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