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Tubular solar still (TSS) is drawing more attention from researchers due to its compact design with many advantages. This study developed a 3-dimensional, 2-phase numerical model tubular for solar still with a parabolic concentrator solar tracking system (PCST-TSS) to study its performance with a negative static pressure caused by a static water column. The developed model can calculate the amount of freshwater production and the gas mixture phase’s temperature. The model was validated by comparing the simulation results, e.g. for water temperature, vapor temperature, and distillate output, with real-field experimental results. Results showed a significant enhancement of the PCST-TSS performance under negative static pressures. Reducing the operating pressure from 100 to 40 kPa enhanced the productivity and thermal efficiency of the PCST-TSS by 53.2% and 57.4%, respectively. Moreover, the CPL was decreased to a very competitive cost of $0.00557 at 40 kPa. The device productivity reached 7.2 L/m 2 day, which is suitable for the essential water needs of one person in small communities and remote areas without infrastructure.

Numerical study on improving the performance of a parabolic concentrator solar tracking-tubular solar still (PCST-TSS) using negative static pressure