In addition, it was found that the use of Triton X-100 as
a surfactant had a deleterious effect on efficiency due to
the extensive formation of foam (Fig. 5). It also was concluded
that there was an increase in efficiency by adding
surfactant to the 0.2 wt% MWCNT nanofluid at a specific
range. From this research, it can be concluded that using
the MWCNT nanofluid resulted in a good increase in
FPSC’s performance. But, both the stability of the nanofluid
and the reduction of performance associated with
the use of the surfactant should be considered with equal
emphasis. Also, this research did not present any information
about the effect of the high temperatures of the solar
collectors, which usually are greater than 60 C