How Does A Refrigerator Work?

13th of July, 2020

Parts Of A FridgeParts Of A Fridge

We all have a fridge at home, it is one of the essential appliances in our homes, but few know how it works. Have you ever stopped to think about how a fridge works? Probably not. And now that you do, you assume it's an appliance that generates cold. Nothing could be further from the truth: a refrigerator works by absorbing heat.

The operation of a refrigerator is based on the Carnot Cycle, a cycle conceived by the engineer Nicolas Carnot in the 19th century which is defined as a cyclical process in which a perfect gas is used and in which two isothermal transformations (in which the temperature is maintained) and two adiabatic transformations (in which there is no heat exchange) take place. Do you still not understand how a refrigerator works? It is much simpler than it seems, let's see. A refrigerator consists of several parts joined together to form a circuit that allows us to keep the food we keep in it cold:

Technology Of  «No Frost» RefrigeratorsCompressor: it consists of an electric motor connected to a compressor that is placed inside a hermetically sealed piece. Condensing coil: it is a radiator formed by two U-shaped tubes with pieces that accelerate the cooling process. Filter-dryer: it is used to eliminate humidity and impurities. Capillary tube: it is a long and thin tube in the shape of a coil that allows the refrigerant to cool down and decrease its pressure.

Evaporator coil: spiral-shaped pipe located inside the refrigerator that extracts the heat from the food. Expansion valve: a throttling mechanism that lowers the temperature and pressure. Thermostat: determines the temperature. Refrigerant liquid/gas: circulates inside in order to absorb heat and release it to the outside. The idea is that the operation of these elements serves to bring the heat out, i.e. to cool the appliance by removing the heat. Surprising, isn't it?

Refrigerator Appliance RepairTechnology Of  «No Frost» Refrigerators 

The refrigerant gas passes through the compressor and undergoes a pressure increase, which allows it to circulate in the circuit in a fluid manner. This high-pressure gas passes to the condenser coil, giving off heat to the outside. Thanks to the cooling fins, the gas cools down and, as it is at very high pressure, it becomes a liquid.

This cooling liquid enters the expansion valve, where its temperature and pressure are reduced. The filter-dryer then cleans the impurities and reduces the humidity of the liquid. When the liquid, with low temperature and low pressure, circulates through the evaporating coil, it is transformed into gas and evaporates absorbing the heat from the food stored in the refrigerator and enters the compressor again starting the cycle. When the thermostat detects that the selected temperature has been reached, the motor, or compressor, stops working and the circuit remains stopped until the temperature increases.

Freezer Appliance Repair«No Frost» refrigerators have been the breakthrough in refrigeration in recent years. The «No Frost» technology, which basically works through a defrosting system, allows the refrigerator to be cooled evenly. In addition to the usual components of any refrigerator, which with the help of a motor cool the inside of the appliance, «No Frost» refrigerators have a fan that distributes the air evenly. What does this fan achieve?

«No frost» is generated because the humidity does not condense. The nutritional properties and taste of the food are better preserved. Thanks to its multiple air outlets, the cold air is distributed more quickly inside and controls the degree of humidity. The main advantages of «No Frost» refrigerator technology are:

  • it prevents the formation of ice and frost inside the refrigerator;
  • it prevents the accumulation of mold and bad odours;
  • the food is kept in good condition for longer, although care must be taken to cover it well to prevent it from dehydrating as a result of the cold.

As you can see, the operation of a refrigerator is simpler than it seems at first, but its internal system can become complex. Dismantling it, recognizing each part, knowing where the gas is introduced, identifying each of the coils and discovering where a breakdown has occurred is a task that must be left to specialized refrigerator technicians.

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