Energy Efficiency Reference/Refrigeration/Recommendations/Install Economizer

Refrigeration Recommendation: Summary Summary Install an economizer in a simple refrigeration cycle to increase the cycle efficiency by increasing the refrigeration effect at a given suction temperature. Economizers only apply to screw compressors with an unused secondary suction port. When to Apply: When a secondary section port is available on screw compressor and suction temperature is <-15 degrees F. Key Engineering Concepts: Refrigeration system is determined by the mass flow rate of the refrigerant and the refrigeration effect at a given suction temperature. The refrigeration effect is the enthalpy change between the expansion device exit and the compressor inlet (suction). During the isenthalpic expansion process, refrigerant evaporates to cool the liquid-gas mixture to the saturation temperature at lower pressure. The remaining vaporization is the refrigeration effect. An economizer vessel at an intermediate pressure is used to separate the saturated liquid and gas after the refrigerant is partially expanded to lower temperature. Less refrigerant mass flows through the evaporator for the same load or system capacity is higher at full flow. Preparation: