When and who invented the refrigerator?

In 1748 William Cullen demostrated artificial refrigeration for the first time, at Glasgow university. This discovery was however not put to pratical use.In 1823, Michael Faraday learned how to change ammonia vapor to a liquid by compressing it ad the liquid is allowed to evaporate this process we have our modern fridges.
Carlinde a Swiss inventor invented the first refridgerating machine in 1874. He used it to cool beer. In 1877 Linde used ammonia as the liquid in the machine. Modern fridges are based on the method. Frezzers work in the same way, but are more powerful and give a greater cooling effect. IN a frezzer food stays frozen at-18 degree centigrade.