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Abstract
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The low efficiency of Collectors that absorb energy can be mentioned as one of the drawbacks
in solar cogeneration cycles. In the present study, solar systems have been improved by adding
porous media and Nanofluid to collectors. One advantage of using porous media and nanomaterials is to absorb more energy while the surface area is reduced. In this study, first, solar collectors are enhanced using 90% porosity copper in solar combined cooling, heating and power
systems (SCCHP). Second, different percentages of CuO and Al2O3 nano-fluids are added to
a flat plate and parabolic collectors to enhance thermal properties. Simulations are performed
in different modes (simple parabolic collectors, simple flat plate collectors, improved flat plate
collectors, parabolic collectors with porous media, and flat plate and parabolic collectors with
different density of CuO and Al2O3 nanofluids). A case study is investigated for warm and dry
regions with mean solar radiation Ib = 820 w / m2 in Iran. The maximum energy and exergy
efficiencies are 60.12% and 18.84%, respectively, that is related to enhanced parabolic solar
collectors with porous media and nanofluids. Adding porous media and nano-fluids increases
an average 14.4% collector energy efficiency and 8.08% collector exergy efficiency.
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