Title: Modelling and simulation of a double ejector refrigeration system: thermodynamic perspectives

Authors: Erdem Ersayin; Leyla Ozgener

Addresses: Department of Mechanical Engineering, Engineering and Natural Sciences Faculty, Manisa Celal Bayar University, TR-45140, Muradiye, Manisa, Turkiye ' Department of Mechanical Engineering, Engineering and Natural Sciences Faculty, Manisa Celal Bayar University, TR-45140, Muradiye, Manisa, Turkiye

Abstract: Conventional single-stage ejectors suffer from pressure lift limitations under high temperature lift conditions. This study proposes a serial double ejector configuration to distribute the compression ratio across two stages. Thermodynamic and exergy analyses were conducted for R1234yf, R290, R600, and R717 at generator temperatures of 70-100°C. Results show that serial staging increases the COP by up to 18% and reduces exergy destruction by 45% at temperature lifts above 30 K. Operability maps identify optimal pressure split ratios and feasible regions, demonstrating that serial staging effectively enables high lift cooling driven by waste heat.

Keywords: double ejector refrigeration cycle; thermal performance analysis; refrigerant selection; entrainment ratio; heat driven cooling.

DOI: 10.1504/IJEX.2026.155456

International Journal of Exergy, 2026 Vol.50 No.3, pp.223 - 236

Received: 23 Jul 2025
Accepted: 12 Feb 2026
Published online: 03 Aug 2026 *

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