A refrigerator is a thermal machine that operates on a thermodynamic cycle that transports a refrigerant through a closed circuit. The goal is to extract heat to a cold environment (the compartment to be cooled or cold source), and to restore it to a warm environment (ambient air or hot source). Above all, it is important to note that the refrigerant must meet the following criteria in particular:
1#: The fluid can easily change state, from the vapor state to the liquid state, or from the liquid state to the vapor state, at reasonable temperatures and pressures.
2#: The latent heats produced during the two changes of state must be important, especially in the cold compartment.
3#: The fluid must meet, in addition, safety standards (non-flammable, non-toxic, not harmful to the environment).
4#: The machine circuit consists of four main components: the compressor, the condenser, the expander and the evaporator.
The operating principle of the refrigerator is based on the heat transfer that takes place between the circulating fluid in a closed circuit with the ambiences of the two cold and hot sources. The air-cooled condensing unit really gets the best offers there.
The different elements of the machine work as follows:
The compressor: It contains the electric motor that compresses the coolant, initially gaseous and cold, which raises its temperature and pressure. At the outlet of the compressor, the fluid is a hot gas and high pressure. It is then routed to the condenser.
The condenser: This is the grid coil, located outside and behind the refrigerator. It receives the fluid coming from the compressor. Through the condenser, the gas gives up heat by diffusion towards the ambient medium, it cools and undergoes a change of state which brings it back to the liquid state. The perfect cold room compressor unit for your help is now here.
The regulator: this element makes it possible to drop the pressure and the temperature of the fluid which arrive in the evaporator. A cold gas-liquid mixture is obtained.
1#: Contrary to popular belief, a fridge does not “make” cold.
2#: But it captures the heat that circulates in the fridge and evacuates it to the outside.
3#: For this you must regularly defrost because the ice that is formed prevents heat exchange.
4#: The ice forms on the closed circuit of a refrigerant which changes from liquid to gaseous then again liquid and very cold, from about 60 ° C to -20 ° C.
5#: The refrigerant circulates in the cooling circuit: the evaporator.
6#: The evaporator absorbs heat from food.
7#: By heating, it evaporates and goes into a gaseous state.
The gas resulting from the evaporation of the refrigerant then passes into the compressor.
It compresses the gas and pushes it into the condenser. By going through the compressor, the temperature increases. In the condenser on the outside of the fridge the gas becomes liquid again. It evacuates its heat to the outside. The Bitzer refrigeration condensing unit is right there for you.
Then the refrigerant passes into the regulator. A kind of fairly wide pipe where the liquid relaxes. At this moment, the temperature of the liquid falls suddenly.
The evaporator: it is located in the cold room of the refrigerator. Fluid circulating in this element begins to evaporate by absorbing the heat transferred by food placed inside the refrigerator. At the outlet of the evaporator, the fluid is, in the gaseous state, very cold and at low pressure. It goes back to the compressor for a new thermal cycle.
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