What is cold? There’s is a common misconception as to how the heating and cooling processes actually work. Many people believe that temperature control is essentially pumping either hot air or cold air into an area. However, in regard to refrigeration, cold is actually the removal or transfer of heat. In essence, the cooling process actually removes or absorbs the heat from inside a refrigeration unit, such as a walk-in cooler or walk-in freezer.
According to the book Modern Refrigeration and Air Conditioning, “cold is the result of removing heat. A refrigerator produces “cold” by drawing heat from the inside of the refrigerator cabinet.”
In other words, in the refrigeration process, the heat is physically removed from the inside of the unit.
How does a Cooler Trailer get cool?
Once the internal temperature of your walk-in cooler or freezer has risen to the set point, the thermostat closes and signals the compressor and condenser fan to turn on.
During the cooling cycle, the evaporator pulls warmer air from the inside of the unit. As the air passes through the evaporator it is cooled and blown back into the unit via the condenser fan. Once the thermostat reaches the desired temperature, the thermostat shuts and the compressor and condenser fan are signaled to shut off.