Energy and exergy analysis of an enhanced solar CCHP system with a collector embedded by porous media and nano fluid

Abstract

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 Al 2 O 3 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 Al 2 O 3 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.

Evaluation of the thermal efficiency of nanofluid flows in flat plate solar collector

“…Furthermore, an experimental study explores silver/water nanofluid in a solar collector, revealing improved convective heat transfer and efficiency [27]. The combinations of porous media and nanofluids would enhance solar collector efficiency by 60.12% [28].…”

Thermodynamic Modeling and Analysis of a Solar and Geothermal-driven Multigeneration System Using TiO2 and SiO2 Nanoparticles

“…After a mathematical analysis, they could achieve up to 220°C in a parabolic trough solar collector coupled with a thermal storage system. Tonekaboni et al [19] studied the amount of enhancement of the solar collectors by adding porous media and nanofluid. They applied 90% porosity copper, CuO, and Al2O3 nanofluids to investigate the changing in the thermal properties of different types of solar collectors.…”