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<p>Transcritical carbon Dioxide refrigeration systems are widely adopted in supermarkets due to their low environmental impact across low ambient temperature regions, yet their efficiency declines sharply in warm climates, limiting adoption beyond cooler regions. This study investigates a novel integration of waste-heat recovery and energy optimization in a multi-evaporator carbon Dioxide refrigeration system supermarket application, combining vapour absorption refrigeration systems or organic Rankine cycles with flash-gas bypass or parallel compression configurations. Six system layouts (two baselines and four advanced integrations) were evaluated across ambient temperatures from 27&#xa0;°C to 45&#xa0;°C using thermodynamic and techno-economic analysis. Results show that integration of a vapour absorption system can repurpose compressor discharge heat to partially meet air-conditioning loads, reducing evaporator cooling demand and improving overall system efficiency. Among all cases, the parallel compression-assisted and vapour absorption-equipped system configuration achieved the highest coefficient of performance and seasonal energy efficiency ratio around 2, with annual energy consumption reduced by 25.2% compared to the baseline. Life cycle cost analysis further identified the parallel compression-assisted and vapour absorption-equipped system as the most cost-effective option. The proposed integration strategy offers a scalable pathway to improve energy performance and reduce operating costs for supermarket refrigeration in warm climates, with significant implications for sustainable food retail infrastructure in regions such as India.</p>

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Enhancing Energy Efficiency of Transcritical Carbon Dioxide System for Supermarket Refrigeration in Warm Climates via Vapour Absorption and Organic Rankine Cycle Integration

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Prosenjit Singha,
  • Sohan Pattanayak,
  • A. M. Guruchethan,
  • Mani Sankar Dasgupta

摘要

Transcritical carbon Dioxide refrigeration systems are widely adopted in supermarkets due to their low environmental impact across low ambient temperature regions, yet their efficiency declines sharply in warm climates, limiting adoption beyond cooler regions. This study investigates a novel integration of waste-heat recovery and energy optimization in a multi-evaporator carbon Dioxide refrigeration system supermarket application, combining vapour absorption refrigeration systems or organic Rankine cycles with flash-gas bypass or parallel compression configurations. Six system layouts (two baselines and four advanced integrations) were evaluated across ambient temperatures from 27 °C to 45 °C using thermodynamic and techno-economic analysis. Results show that integration of a vapour absorption system can repurpose compressor discharge heat to partially meet air-conditioning loads, reducing evaporator cooling demand and improving overall system efficiency. Among all cases, the parallel compression-assisted and vapour absorption-equipped system configuration achieved the highest coefficient of performance and seasonal energy efficiency ratio around 2, with annual energy consumption reduced by 25.2% compared to the baseline. Life cycle cost analysis further identified the parallel compression-assisted and vapour absorption-equipped system as the most cost-effective option. The proposed integration strategy offers a scalable pathway to improve energy performance and reduce operating costs for supermarket refrigeration in warm climates, with significant implications for sustainable food retail infrastructure in regions such as India.