Since the humble beginnings of the earliest cool box produced by Francis Malley in 1884, cooler boxes have been developed to suit. They now have a wide range of shapes and sizes, often with specific functions. One thing that most of them have is that they are almost completely insulated with CFC-free polyurethane foam. It is introduced under pressure between the inner and outer facing of the ice chamber. The use of injection with high compression means that the entire polyurethane foam falls even into the smallest corners and cracks inside the hollow body, ensuring uniformity and complete insulation.
A particularly interesting innovation is the use of thermoelectric coolers. These are really cooler boxes that are a motorist's best friend! These thermoelectric ice boxes are connected to the cigarette lighter in your car and run on your 12-volt battery. The scientific concept of preserving cold in food, using a current of electricity to remove warm air from food, is known as the Peltier effect. In accordance with the Peltier effect, if you want to reverse the flow, you can also keep the food hot. However, they are usually used to keep food cool and not hot. There are flaws in these thermoelectric ice boxes. First, coolers are much smaller than most families consider appropriate. Secondly, these ice crates are usually drained on your car battery.
The most suitable size of a cool box for an average Australian family that enjoys plenty of outdoor living and dining outdoors is one with a capacity of 50 liters. If for any reason you do not need to use all the space in the ice box, you must fill the empty spaces in the cooler with small bottles of water that you have previously frozen. The reason for this is that coolers work much more efficiently when they remain in full. Half empty coolers have too much circulating air, which will cause much colder temperatures from food to try and create a common temperature inside the box. This leads to thawing of any frozen food that you can store in your ice box, and to heat any food that is colder than the ambient temperature in an ice box. So that your food is kept as cold as you want, always keep your ice box full. In any case, it is best to fill at least half the volume of the box with ice.
Of course, the cooler boxes have come a long way since their more modest beginnings. Now the choice is so varied that it would be hard for the average client to decide which of the best boxes for their needs. This is where the combo cool box comes into its own. This is a product consisting of a 45-liter cooler, as well as a 5-quart "flip-cap", as well as an insulated box with a volume of 1.15 liters. All of them are insulated with polyurethane foam without CFC. The 45-liter cooler is 64 cm long, 37 cm high and 34 cm wide. As a starter kit, this set of three is perfect, allowing you to use each size ice box and learn first-hand what is perfect for cooling.
