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<p>This study presents a novel hybrid system integrating (1) a supercritical CO<sub>2</sub> (sCO<sub>2</sub>) recompression Brayton cycle, (2) high-temperature latent heat storage (LHS) with Cu–Si–Mg phase change material (PCM), and (3) a direct contact membrane distillation (DCMD) unit for sustainable cogeneration of power and freshwater. The system utilizes waste heat from the sCO<sub>2</sub> cycle (70&#xa0;°C) to drive desalination via DCMD, while the LHS ensures stable thermal input to the cycle. For the LHS system, two different conduits (i.e., horizontal and vertical) filled with PCM were examined to demonstrate the faster charging for a vertically oriented conduit than a horizontal conduit. A 2.7 times increase in the melting fraction is observed with a 1.67 times increase in the input heat flux, demonstrating the establishment of a nonlinear melting with input heat. The sCO<sub>2</sub> cycle indicates that there exists an optimum split ratio (i.e., 0.7) to get an approximately favorable input temperature for DCMD (i.e., 68.7&#xa0;°C) operation. Also, we observed that the thermal efficiency of sCO<sub>2</sub> cycle remains unaltered by altering its mass flow rate. For a DCMD system working with fixed operating and geometric parameters, a 46.2% decrease in the feedwater (FW) temperature (<i>T</i><sub>f</sub>) results in a 115.6% increase in the permeate temperature (<i>T</i><sub>p</sub>). Furthermore, the work reports a permeate flux of 113 kgh<sup>−1</sup> at the feedwater and permeate temperature of 80&#xa0;°C, and 10&#xa0;°C, respectively.</p>

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Sustainable thermal distillation: investigation of supercritical carbon dioxide cycle coupled with direct contact membrane distillation system

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Alok Kumar Ray

摘要

This study presents a novel hybrid system integrating (1) a supercritical CO2 (sCO2) recompression Brayton cycle, (2) high-temperature latent heat storage (LHS) with Cu–Si–Mg phase change material (PCM), and (3) a direct contact membrane distillation (DCMD) unit for sustainable cogeneration of power and freshwater. The system utilizes waste heat from the sCO2 cycle (70 °C) to drive desalination via DCMD, while the LHS ensures stable thermal input to the cycle. For the LHS system, two different conduits (i.e., horizontal and vertical) filled with PCM were examined to demonstrate the faster charging for a vertically oriented conduit than a horizontal conduit. A 2.7 times increase in the melting fraction is observed with a 1.67 times increase in the input heat flux, demonstrating the establishment of a nonlinear melting with input heat. The sCO2 cycle indicates that there exists an optimum split ratio (i.e., 0.7) to get an approximately favorable input temperature for DCMD (i.e., 68.7 °C) operation. Also, we observed that the thermal efficiency of sCO2 cycle remains unaltered by altering its mass flow rate. For a DCMD system working with fixed operating and geometric parameters, a 46.2% decrease in the feedwater (FW) temperature (Tf) results in a 115.6% increase in the permeate temperature (Tp). Furthermore, the work reports a permeate flux of 113 kgh−1 at the feedwater and permeate temperature of 80 °C, and 10 °C, respectively.