Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Performance Evaluation of Electronic Expansion Valves with Nozzle

노즐이 적용된 전자식 팽창밸브의 성능평가

  • Eui Jeon Jeong (Major of Mechanical Engineering, Jeju National University) ;
  • Gwang Soo Ko (Industry-Academic Cooperation Foundation, Jeju National University) ;
  • Youn Cheol Park (Major of Mechanical Engineering, Jeju National University)
  • Received : 2025.02.26
  • Accepted : 2025.05.22
  • Published : 2025.06.01
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Abstract

Energy efficiency improvements in refrigeration systems are major issues to addressing rising energy consumption and environmental concerns. In this study, the performance of an electronic expansion valve (EEV) system with nozzle were experimentally investigated by evaluating its cooling capacity, power consumption, and coefficient of performance (COP). Three different nozzle diameters (0.8 mm, 1.0 mm, and 1.2 mm) were installed downstream of the EEV, and the system's performance was compared with a conventional EEV only system. Experiments were performed under controlled conditions at ambient temperature, varying the EEV opening rates from 10% to 100%. The results showed that the system with a 1.0 mm nozzle achieved the highest cooling capacity (1456.7W) and coefficient of performance (COP of 2.35), along with an improved minimum COP of 2.00, indicating stable and enhanced efficiency. In the case of the 1.0 mm nozzle, choked flow occurred at an opening ratio of 80%, limiting mass flow rate increases. On the other hand, the 0.8 mm and 1.2 mm nozzles and the EEV only system showed peak mass flow rates at 20~40% valve openings. Overall, the application of nozzles contributed positively to refrigerant flow control and heat exchange efficiency.

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Acknowledgement

이 논문은 2025년도 제주대학교 교원성과지원사업에 의하여 연구되었음.

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