In an NH3 system, what pressure is associated with the low side?

In an NH3 (ammonia) refrigeration system, the low side of the system is associated with the evaporation process. This occurs within the evaporator, where the refrigerant absorbs heat from the surrounding environment and changes from a liquid to a vapor. The pressure in the evaporator is significantly lower than that in the high side, which typically includes the condenser and discharge line.

The evaporator's function is to facilitate the cooling effect, and it operates at low pressure to allow the refrigerant to evaporate at a lower temperature. The relationship between pressure and temperature in refrigeration systems is crucial; as pressure decreases, the boiling point of the refrigerant also decreases, enabling effective heat absorption from the environment.

Understanding the pressures involved in different components of an NH3 system is essential for proper system design, troubleshooting, and maintenance. Recognizing that the low side is reliant on the evaporator helps in identifying potential issues related to temperature control and system efficiency.