In the present study, the energy, exergy, economic and environmental (4E) analyses were
performed on basis of a previous experimental study on Pyramid Solar Still (PSS) incorporated with a novel aircooled glass system. This study is an attempt to obtain deep insights into the effect of the air-cooled glass cover
with PSS on the efficacy of energy conversion, economic feasibility and the contribution to mitigating CO2
emissions. The experimental data obtained formerly was used for these analyses. The 4E analyses were done for
two operation modes; PSS without cooled-glass cover (PSS1) and PSS with air-cooled glass cover (PSS2). The
obtained results from the present study revealed that PSS2 improves the daily productivity and energy efficiency
by 19.77 and 19.75%, respectively over the PSS1 with a relatively lower daily exergy efficiency of 10.7%.
However, PSS2 enhances the annual productivity by 19.72% over PSS1 with an approximately equivalent cost
for unit production (~0.0133 $/L/m2
), although the relatively high total annual cost of PSS2. The
exergoeconomic parameter of PSS2 based on exergy has been reduced by 11.92% than PSS1, which means low
costs of exergy losses for PSS2. The total CO2 emission mitigation (1237.25 kg) and the total net CO2
mitigation (8.312 tons) for PSS2 throughout its lifetime (10 years) are higher than PSS1 by 12.30% and 21.31%,
respectively. The earned carbon credit of PSS2 (120.53$) is higher than PSS1 by 21.30% and the energy
payback time (1.295 years) is shorter than PSS1 by 8.80%. Hence, the novel integration of the air-cooling
system with PSS is promised from the technical, economic and environmental aspects taking into consideration
to use of low power for the cooling process in future works for better performance.