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<p>The ingress of air into the vapor compression refrigeration system is a frequent occurrence, typically occurring during installation, maintenance, or charging. Air, being a non-condensable gas relative to the refrigerant gas within the system, leads to system degradation mostly due to elevated condensing pressure. This experimental study investigates the impact of non-condensable gas (air) contamination on the performance of a vapor compression refrigeration system using R134a refrigerant. A chest freezer was tested under steady-state conditions with air fractions of 0%, 1.7%, 2.5%, and 3.3% at an ambient temperature of 32&#xa0;°C. Energy, exergy, and environmental analyses were conducted to evaluate system efficiency, power consumption, and sustainability. Results revealed that increasing air fractions significantly degraded performance: at 3.3% air, power consumption rose by 37.1%, while the coefficient of performance dropped by 42.8% compared to the air-free system. Also, exergy destruction rate increased by 189%, and exergy efficiency decreased by 119.1%, indicating severe thermodynamic inefficiencies. Additionally, higher air fractions led to elevated compressor temperatures, increased noise, and greater environmental impact due to higher energy-related emissions. The study highlights the critical need for rigorous system evacuation and leak prevention in refrigeration systems to maintain optimal efficiency and reduce operational costs.</p>

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Exploring the influence of air fractions on the performance of a vapor compression refrigeration system: an energy, exergy, and environmental analysis

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月30日

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  • Hayder Mohsin Ali,
  • Saif Ali Kadhim,
  • Karrar A. Hammoodi,
  • Ali M. Ashour,
  • Ahmed M. Hassan,
  • Mohammed Azeez Alomari,
  • Ali Habeeb Askar

摘要

The ingress of air into the vapor compression refrigeration system is a frequent occurrence, typically occurring during installation, maintenance, or charging. Air, being a non-condensable gas relative to the refrigerant gas within the system, leads to system degradation mostly due to elevated condensing pressure. This experimental study investigates the impact of non-condensable gas (air) contamination on the performance of a vapor compression refrigeration system using R134a refrigerant. A chest freezer was tested under steady-state conditions with air fractions of 0%, 1.7%, 2.5%, and 3.3% at an ambient temperature of 32 °C. Energy, exergy, and environmental analyses were conducted to evaluate system efficiency, power consumption, and sustainability. Results revealed that increasing air fractions significantly degraded performance: at 3.3% air, power consumption rose by 37.1%, while the coefficient of performance dropped by 42.8% compared to the air-free system. Also, exergy destruction rate increased by 189%, and exergy efficiency decreased by 119.1%, indicating severe thermodynamic inefficiencies. Additionally, higher air fractions led to elevated compressor temperatures, increased noise, and greater environmental impact due to higher energy-related emissions. The study highlights the critical need for rigorous system evacuation and leak prevention in refrigeration systems to maintain optimal efficiency and reduce operational costs.