Cooling Revolution? Introducing Solid State Refrigerators

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Solid state refrigerators look set to replace typical units that rely on compressors, refrigerants and evaporators to run. In fact, they’re more environmentally friendly – using less energy, producing less noise pollution, and reducing carbon footprint!  But what is a solid state refrigerator and how does it work? Let’s take a look…

solid state refrigerators

What is solid state cooling?

Thermoelectric cooling was first discovered in 1834 by French physicist Jean-Charles Peltier, whose experiments determined that when a current is made to flow through an electrified junction between two conductors, heat can be generated or removed at the junction.  Termed the Peltier Effect, this method of cooling has been used for many years in small devices and components – CPU coolers are one such example, as these disperse heat away from computer processors and prevent them from running at extreme temperatures, thereby cooling both the processing chip and the cooler. As more applications began integrating thermoelectric cooling, it was only a matter of time before this technology was applied to refrigeration.

How does solid state cooling work in refrigerators?

Refrigeration manufacturers have begun integrating solid state cooling into their units – eliminating the need for compressors and evaporators.  Instead, next-generation fridges are equipped with compact thermoelectric semi-conductors to actively move heat energy. Natural refrigerants in the unit absorb this heat energy, and transfer it into specialised tubing which is cleverly dispersed away from the fridge through a solid state heat pump.  There’s also the development of solid state fridges that use magnets for cooling.  Materials such as gadolinium, a silver white metal, heat up when placed in a magnetic field. When the heat energy and magnetic field are removed by fluid in the fridge, the gadolinium automatically cools to below its starting temperature.

What will solid state technology mean for the future of refrigeration?

Until now, solid state refrigeration has been used in smaller fridge units with a minimum temperature of 4°C, and small freezers running at -20°C. Going forwards, however, we can expect technological advancements in this area to pick up pace, and to be applied to both home and supermarket refrigeration equipment. Solid state refrigerators offer numerous benefits, including:

  • They’re more energy efficient as there’s no need for power-hungry coolers or pumps to squeeze refrigerant gas and convert it into liquid. Some manufacturers are already claiming up to 40% reduced power consumption!
  • Less noise pollution and vibration which is common in current compressor-dependent models
  • Although most current refrigeration units are designed to be sensitive to the environment with improved lighting, gases, coils and fans, no compressor means less harmful refrigerants and a reduced carbon footprint.
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