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<p>This study explores an enhancement in the thermal management of direct contact membrane distillation (DCMD) systems operating under extreme operating conditions. Traditional DCMD configurations utilizing a single cooling heat exchanger (CHX) for heat recovery have proven inadequate for dissipating the heat build-up within the system’s cold storage tank during closed-loop operations. To address this inefficiency, a double-stage cooling (DSC) design was introduced and assessed through rigorous energetic and exergetic analyses, based on experimental data. The results indicate a substantial improvement in the DCMD system performance, with the DSC-enhanced DCMD system delivering a 2–threefold increase in performance over the conventional single-stage cooling (SSC) setup. However, a marked decrease in exergetic efficiency was noted when the hot flow rate surpassed 300 l/h, primarily due to increased thermal energy loss through heat conduction between juxtaposed hot and cold streams. Notably, exergy destruction was most significant within the central cooling units (CCU) for both SSC and DSC systems, peaking at 72.1% and 78.5%, respectively. This is likely due to the suboptimal utilization of the heat discharged from the CCU.</p>

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Experimental Evaluation of a Direct Contact Membrane Distillation System Efficiency Under Single- and Double-Stage Cooling Modes

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Abdullah Najib,
  • Emad Ali,
  • Hany Al-Ansary,
  • Fahad Awjah Almehmadi

摘要

This study explores an enhancement in the thermal management of direct contact membrane distillation (DCMD) systems operating under extreme operating conditions. Traditional DCMD configurations utilizing a single cooling heat exchanger (CHX) for heat recovery have proven inadequate for dissipating the heat build-up within the system’s cold storage tank during closed-loop operations. To address this inefficiency, a double-stage cooling (DSC) design was introduced and assessed through rigorous energetic and exergetic analyses, based on experimental data. The results indicate a substantial improvement in the DCMD system performance, with the DSC-enhanced DCMD system delivering a 2–threefold increase in performance over the conventional single-stage cooling (SSC) setup. However, a marked decrease in exergetic efficiency was noted when the hot flow rate surpassed 300 l/h, primarily due to increased thermal energy loss through heat conduction between juxtaposed hot and cold streams. Notably, exergy destruction was most significant within the central cooling units (CCU) for both SSC and DSC systems, peaking at 72.1% and 78.5%, respectively. This is likely due to the suboptimal utilization of the heat discharged from the CCU.