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A pot-in-pot refrigerator, clay pot cooler [1] or zeer (Arabic: زير) is an evaporative cooling refrigeration device which does not use electricity. It uses a porous outer clay pot (lined with wet sand) containing an inner pot (which can be glazed to prevent penetration by the liquid) within which the food is placed.
Evaporative cooling chambers (ECCs), also known as "zero energy cool chambers" (ZECCs), are a type of evaporative cooler, which are simple and inexpensive ways to keep vegetables fresh without the use of electricity. Evaporation of water from a surface removes heat, creating a cooling effect, which can improve vegetable storage shelf life.
An evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles.
In 1939, Gust also helped his brothers Adam and William Goettl to form IMPCO (International Metal Products Co.), which became a market leader by the 1940s in the evaporative cooler industry. [4] Gust and Adam, as sole stockholders, sold the company in the 1960s to International Metal and sold the building they worked in to McGraw-Edison .
The company was founded in 1947 in Katy and is known for its blue and white coolers. [citation needed] Igloo's product line includes a wide range of coolers and ice chests for various uses, from small personal coolers to large commercial coolers, as well as beverage dispensers, marine coolers, and accessories.
Ice packs are used in coolers to keep perishable foods (especially meats, dairy products, eggs, etc.) below the 5–75 °C (41–167 °F) danger zone when outside a refrigerator or freezer, and to keep drinks pleasantly cool.