Abstract: This study presents experimental results focused on a performance comparison of a transcritical CO₂ ejector system without an internal heat exchanger (IHX) (EJE-S) to a transcritical CO₂ ejector system with an IHX (EJE-IHX-S). The comparison includes the effects of changes in operating conditions such as cooling water flow rate and inlet temperature. Experiments are conducted to assess the influence of the IHX on the heating coefficient of performance (COP_r), heating capacity, entrainment ratio, pressure lift, and other parameters. The primary flow rate of the EJE-IHX-S is higher than that of the EJE-S. The pressure lift and actual ejector work recovery are reduced when the IHX is added to the transcritical CO₂ ejector system. Using a more practical performance calculation, the compression ratio in the EJE-S is reduced by 10.0%–12.1%, while that of EJE-IHX-S is reduced only by 5.6%–6.7% compared to that of a conventional transcritical CO₂ system. Experimental results are used to validate the findings that the IHX weakens the contribution of the ejector to the system performance.

Key words: CO₂ ejector system, Transcritical cycle, Heating coefficient of performance (COP_r)

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