1. How is cargo chilled?
2. How is cold generated?
3. What is the energy source?
4. What happens in the load?

PRODUCTION OF REFRIGERATION

HOW DOES THE REFRIGERATION CIRCUIT WORK?
The simple refrigeration circuit consists of 2 heat exchangers (condenser and evaporator), a compressor and an expansion valve.

1. COMPRESSION PROCESS
The compressor takes in the refrigerant gas at low temperature and low pressure. After compression, the superheated compressed refrigerant exits the compressor at higher temperature.

2. CONDENSATION PROCESS
The compression work is stored in the refrigerator in the form of pressure and temperature increases. The air flow or rotating fans dissipate the stored heat of the refrigerant into the environment via the condenser surface. The refrigerant cools down and condenses at relatively the same pressure.

3. EXPANSION PROCESS
Liquid refrigerant enters the expansion valve at high pressure and expands to evaporation pressure. The expansion causes the temperature of the refrigerant to drop. Expansion produces a two-phase mixture of liquid and gaseous refrigerant.

4. EVAPORATION PROCESS
The evaporator is the component with the lowest temperature in the process. The fans cause the ”warm“ air in the loading space to move to the evaporator surface. Because the evaporator is colder than the air, heat flows into the evaporator and the physical state of the refrigerant changes from liquid to gas. Pressure and temperature hardly change.
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