A 1D model to predict ejector performance at critical and sub-critical operational regimes

• A new 1D model to predict ejector performance at critical and sub-critical operational modes.
• The model is verified against four experimental data with different fluids and geometries.
• The proposed model accurately predicts ejector performance over all ranges of operation.

This paper proposes a new 1D model to predict ejector performance at critical and sub-critical operational modes, while most previous 1D models have only predicted ejector performance at critical mode operation. Constant pressure mixing is assumed to occur inside the constant area section of the ejector at critical and sub-critical mode operation, and the effectiveness of the model is verified against four sets of experimental data that include different working fluids and geometries. The results show that the proposed model accurately predicts ejector performance over all ranges of operation, and is a useful tool for predicting ejector performance within larger refrigeration cycle models.