From where does Cool Gas Defrost deliver gas to the evaporator?

In a Cool Gas Defrost system, the gas delivered to the evaporator comes from the High-Pressure Receiver (HPR). This process involves using refrigerant vapor from the HPR, which is at a higher pressure compared to other components. The rationale for utilizing gas from the HPR is that it contains sufficient thermal energy to effectively warm the evaporator coils, facilitating the defrosting of any accumulated ice or frost.

The HPR collects refrigerant that has already been condensed and separated from the liquid, ensuring that only vapor is utilized in the defrost process. This approach effectively raises the temperature of the evaporator, which is essential for maintaining efficiency and performance in refrigeration systems.

In contrast, other sources like the discharge header of high-stage compressors, the Low-Pressure Receiver (LPR), and the accumulator do not provide the optimal conditions or thermal properties required for the defrost process, making the High-Pressure Receiver the appropriate choice for delivering gas in this context.