Refrigeration is an essential technology in our state-of-the-art society, and plays a key part in almost all areas of life. From keeping foodstuffs cool to air-conditioning in data centres, refrigeration makes it possible to transmit heat from a colder to a warmer area and thus keep conditions ideal. Many things would be impossible without the mostly invisible yet essential technical systems used in refrigeration, such as the supply of foodstuffs and medical products, and advances in digitalization. This technology is constantly growing and has become an indispensable element of our daily lives.