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Numerical analysis of hybrid heat driven ejector system based on the ejector performance map approach.

Number: 2279

Author(s) : YOSHIDA T., ELBEL S.

Summary

Recently, the utilization of low-grade thermal energy has gained increased attention as an attractive opportunity to save energy. Heat driven ejector refrigeration systems are promising solutions for utilizing thermal energy from waste heat. However, the main drawbacks of this system are low efficiency under high ambient temperature conditions and difficult controllability. The hybrid ejector system is a promising solution for overcoming these drawbacks. In this system, a booster compressor is installed in order to improve efficiency under a wide range of conditions. In addition, three valves are used to switch between the three operation modes: ejector mode, hybrid mode, and compression mode. In this study, a numerical analysis of the hybrid ejector system is performed and compared with experimental results. The investigations focus on chilled water supply conditions (evaporation temperature is 5 °C) under various condensation temperature conditions ranging from 15 °C to 35 °C. Low-grade waste heat at 70 °C is used to drive the ejector. R290 (propane), which is a promising natural refrigerant, is used in the system. The Newton-Raphson method implemented in MATLAB is used for iterative calculations. Regarding the ejector model, a novel ejector map approach is proposed in order to make an empirical ejector model. In this modeling, two pressure ratios are used to calculate the ejector entrainment ratio. The numerical analysis results and ejector modeling results show good agreement with the experimental results and these methods are validated.

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  • Original title: Numerical analysis of hybrid heat driven ejector system based on the ejector performance map approach.
  • Record ID : 30030643
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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