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Direct Analytical Modeling for Optimal, On-Design Performance of Ejector for Simulating Heat-Driven Systems

Author

Listed:
  • Fahid Riaz

    (Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
    Department of Mechanical Engineering, University of Engineering and Technology Lahore, Lahore 54000, Pakistan)

  • Fu Zhi Yam

    (Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore)

  • Muhammad Abdul Qyyum

    (School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Korea)

  • Muhammad Wakil Shahzad

    (Department of Mechanical and Construction Engineering, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK)

  • Muhammad Farooq

    (Department of Mechanical Engineering, University of Engineering and Technology Lahore, Lahore 54000, Pakistan)

  • Poh Seng Lee

    (Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore)

  • Moonyong Lee

    (School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Korea)

Abstract

This paper describes an ejector model for the prediction of on-design performance under available conditions. This is a direct method of calculating the optimal ejector performance (entrainment ratio or ER) without the need for iterative methods, which have been conventionally used. The values of three ejector efficiencies used to account for losses in the ejector are calculated by using a systematic approach (by employing CFD analysis) rather than the hit and trial method. Both experimental and analytical data from literature are used to validate the presented analytical model with good agreement for on-design performance. R245fa working fluid has been used for low-grade heat applications, and Engineering Equation Solver (EES) has been employed for simulating the proposed model. The presented model is suitable for integration with any thermal system model and its optimization because of its direct, non-iterative methodology. This model is a non-dimensional model and therefore requires no geometrical dimensions to be able to calculate ejector performance. The model has been validated against various experimental results, and the model is employed to generate the ejector performance curves for R245fa working fluid. In addition, system simulation results of the ejector refrigeration system (ERS) and combined cooling and power (CCP) system have been produced by using the proposed analytical model.

Suggested Citation

  • Fahid Riaz & Fu Zhi Yam & Muhammad Abdul Qyyum & Muhammad Wakil Shahzad & Muhammad Farooq & Poh Seng Lee & Moonyong Lee, 2021. "Direct Analytical Modeling for Optimal, On-Design Performance of Ejector for Simulating Heat-Driven Systems," Energies, MDPI, vol. 14(10), pages 1-21, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2819-:d:554526
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    References listed on IDEAS

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    1. Fahid Riaz & Kah Hoe Tan & Muhammad Farooq & Muhammad Imran & Poh Seng Lee, 2020. "Energy Analysis of a Novel Ejector-Compressor Cooling Cycle Driven by Electricity and Heat (Waste Heat or Solar Energy)," Sustainability, MDPI, vol. 12(19), pages 1-21, October.
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    1. Tauseef Aized & Muhammad Rashid & Fahid Riaz & Ameer Hamza & Hafiz Zahid Nabi & Muhammad Sultan & Waqar Muhammad Ashraf & Jaroslaw Krzywanski, 2022. "Energy and Exergy Analysis of Vapor Compression Refrigeration System with Low-GWP Refrigerants," Energies, MDPI, vol. 15(19), pages 1-22, October.

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