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How does a drinks vending machine keep drinks cold?


Vending machines keep drinks cold through the process of refrigeration. Once the desired temperature is set, the machine’s inbuilt sensors maintain a steady temperature by regulating the flow of compressed gas through a condenser and expansion device to cool the air inside the cabinet. Electricity is used in the compression process. However, a new style of vending machine is currently being developed in Asia which may revolutionise the efficiency of cooling vending machines. This model only needs to refrigerate at night (when power is cheapest) and is then turned off for up to 16 hours during the day. The drinks remain cold through a sophisticated process of vacuum insulation.

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