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<p>This study presents an experimental evaluation of four different materials cooling used in a Direct Evaporative Cooling System (DECS) and their influence on the cooling performance of refrigerant condensers. The experiments were conducted at varying water flow rates with respect to different levels of ambient air temperatures and relative humidity: from 100 to 300&#xa0;ml/min for air at 30&#xa0;°C DBT, from 170 to 500&#xa0;ml/min for air at 35&#xa0;°C DBT, from 300 to 850&#xa0;ml/min for air at 40&#xa0;°C DBT, and from 500 to 1500&#xa0;ml/min for air at 45&#xa0;°C DBT. In this comparative analysis, each pad of equal thicknesses was assessed based on the parameters such as: air flow rate ratio, temperature drop, rate of water evaporation, cooling capacity, pad effectiveness, COP of the system and their impact on refrigerant condenser cooling. The experimental results indicate that at each ambient temperature levels, the temperature drop, rate of water evaporation, cooling capacity, pad effectiveness, COP of the system and heat rejection from the refrigerant condenser increase as the water flow rate increases, However, the airflow rate ratio of the condenser and the energy efficiency decreases simultaneously. Additionally, the present study also shows that the sensible heat loss is greater than the latent heat gain. In terms of sensible heat factor, when water flow rates and ambient air temperature increased, SHF decreased indicating increment in the latent heat gain. In terms of experimental range, the cellulose pad cooling capacity and effectiveness reaches up to 0.607–3.566&#xa0;KW and 43.38–76.58% respectively and up to 40.69% increment of heat rejection from refrigerant condenser. This indicates that the cellulose pad provides the most significant improvement in cooling performance, with the banana fibre pad, jute fibre pad, and cotton thread pad following in terms of cooling capacity, cooling effectiveness, and heat rejection. These findings provide valuable insights into the selection of cooling pads for optimal condenser performance, offering a path toward enhanced energy efficiency in HVAC systems.</p>

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Experimental Assessment of Four different materials Cooling Pads in DECS and Their Impact on Refrigerant Condenser Cooling: A Comparative Analysis

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • R. S. N. Sahai,
  • Umais M. Momin

摘要

This study presents an experimental evaluation of four different materials cooling used in a Direct Evaporative Cooling System (DECS) and their influence on the cooling performance of refrigerant condensers. The experiments were conducted at varying water flow rates with respect to different levels of ambient air temperatures and relative humidity: from 100 to 300 ml/min for air at 30 °C DBT, from 170 to 500 ml/min for air at 35 °C DBT, from 300 to 850 ml/min for air at 40 °C DBT, and from 500 to 1500 ml/min for air at 45 °C DBT. In this comparative analysis, each pad of equal thicknesses was assessed based on the parameters such as: air flow rate ratio, temperature drop, rate of water evaporation, cooling capacity, pad effectiveness, COP of the system and their impact on refrigerant condenser cooling. The experimental results indicate that at each ambient temperature levels, the temperature drop, rate of water evaporation, cooling capacity, pad effectiveness, COP of the system and heat rejection from the refrigerant condenser increase as the water flow rate increases, However, the airflow rate ratio of the condenser and the energy efficiency decreases simultaneously. Additionally, the present study also shows that the sensible heat loss is greater than the latent heat gain. In terms of sensible heat factor, when water flow rates and ambient air temperature increased, SHF decreased indicating increment in the latent heat gain. In terms of experimental range, the cellulose pad cooling capacity and effectiveness reaches up to 0.607–3.566 KW and 43.38–76.58% respectively and up to 40.69% increment of heat rejection from refrigerant condenser. This indicates that the cellulose pad provides the most significant improvement in cooling performance, with the banana fibre pad, jute fibre pad, and cotton thread pad following in terms of cooling capacity, cooling effectiveness, and heat rejection. These findings provide valuable insights into the selection of cooling pads for optimal condenser performance, offering a path toward enhanced energy efficiency in HVAC systems.