Steam ejectors and injectors present a structurally simple alternative to electric compressors and pumps. In this degree paper we focused on the field of cooling technology. We used a thermodynamic model to investigate a constant pressure mixing ejector and iteratively calculated its entrainment ratio at selected working conditions. By modifying the ejector model, we decreased the error of the results and subsequently performed exergy analysis on the given ejector. The working fluid used was R600a. With thermodynamic and thermoeconomic analysis we evaluated steam ejectors and injectors in comparison with compressors and pumps. For latter we calculated the total exergy efficiency considering the average exergy efficiencies of generation and transportation of electricity in Slovenia. We found that in certain instances steam ejectors and injectors can exergetically outperform compressors and pumps. However, thermoeconomic calculations revealed that steam ejectors and injectors are more expensive than compressors and pumps in selected cooling systems.
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