Can you explain the technical differences between a fridge....and what Disney supposedly has? For those of us who don't design ice-boxes for a living.
A true
refrigerator (that we all are familiar with) uses a refrigerant gas and a compressor in a closed system. The refrigerant gas is passed through a compressor.(the heavy thing in the fridge that you hear when it cycles on and off). Then, the gas is compressed and thus the pressure on it increases. The temperature of this gas in turn increases as a result of the increased pressure and it takes the form of superheated vapor. The refrigerant passes through the heat exchanging pipes and releases its heat to the surroundings (air). Therefore, the refrigerant cools down due to the loss of heat to the surroundings (air).
As the refrigerant passes through a condenser, its temperature is reduced. BUT, the pressure on the refrigerant remains the same. Due to the reduction in its temperature, the refrigerant gets converted into its liquid form. Then, an expansion valve causes a sudden reduction in the pressure on the refrigerant. Some of the refrigerant evaporates and expands. This expansion results in the lowering of the temperature of the refrigerant. During the evaporation of the liquid refrigerant, it is present in the evaporator, which absorbs the heat from the food, beer, soda, or whatever you put in the refrigerator and basically.... cools them.
The refrigerant again heats up to form a gas. This refrigerant, which is now back in its gaseous form, again enters the compressor and the cycle starts all over again........
The
"coolers" that were in WDW work using thermoelectric cooling with something called a Peltier Device / Peltier Effect or Principle. This is where there is a heat flux (transfer) between the junction of two different types of materials. A Peltier cooler is a solid-state (transistors, etc ...no moving parts) heat pump that transfers heat from one side of the device to the other, (using the electrical energy). The device has two sides, and when DC current flows through the device, it brings heat from one side to the other, so that one side gets cooler while the other gets hotter. The "hot" side is attached to a heat sink so that it remains at ambient temperature, while the cool side goes below room temperature. Then there are fans to move the air in the cooler and to remove heat. The main advantages of this type cooler (
compared to a vapor-compression refrigerator as described above) is the lack of moving parts or circulating liquid, and its small size (due to lack of the bulky compressor and all the other components mentioned above). Its main disadvantage is high cost and poor power efficiency. The moving parts in a cooler such as this are basically the circulation / ventilation fans (very low voltage) that are used to move the heat away from the unit. The advantage of the "cooler" and technology used is that it's smaller (or can be), lighter ...and has no really important (expensive) moving parts. The disadvantage is that only a limited amount of heat flux (transfer) is able to be dissipated, and is not as efficient, in terms of performance ("Delta-T" or change in temperature), as vapor-compression systems [meaning ...they don't cool as efficiently or quickly]
.....as a side note ...I don't design these things for a living ...I'm a civil engineer by training and current practice ...but I did take Thermo-Dynamics in college ...and some of the basic laws of heat transfer are at play with refrigeration.
...hope this wasn't too complicated? I tend to be too technical sometimes ...but I tried to simplify as best as I could.