  In this paper, we performed four modifications on the solar still, as (A)
adding the graphite nanoparticles, (B) the graphite nanoparticles together with
the phase change material (PCM), (C) the graphite nanoparticles together with
glass film cooling, and (D) graphite nanoparticles with both PCM and glass film
cooling. The effects of modifications are measured and compared with each
other. The productivities of modified (A), (B), (C), and (D) solar stills are
enhanced by about 50.28%, 65.00%, 56.15% and 73.80%, respectively, as compared
with the conventional solar still. The influences of saline water depths on the
performance of modifications (A) and (B) are also considered. Results revealed
that the best output yield is obtained for 0.5cm water depth for all solar
stills.
