Aqueous nanofluids containing paraffin-filled MWCNTs for improving effective specific heat and extinction coefficient

Experimental Study on a Superstable Nano-TiO2 Deep Eutectic Solvent Nanofluid for Solar Energy Harvesting

“…As demonstrated in Figure 5b,c, the method for determining specific heat capacity was referred a literature reported elsewhere by using DSC after correcting with sapphire standard sample. 42 It is revealed in Figure 5d that the specific heat capacity shows a positive correlation with the testing temperature at 300−320 K and reaches a vertex value at 320 K with a 19.2% enhancement rate compared with that of pristine DES, while the patterns tend to decrease after the testing temperature went across 320 K and gradually became steady after 340 K. This result is quite in line with our previously reported data which is recorded by a homemade specific heat capacity analysis platform and might be attributed to an intermolecular hydrogen bond association between DES so that the motion of glycerol molecules was restrained due to the hydrogen bond association between them and the nanoparticle which thus results in the thermal energy input increasing at this temperature. Meanwhile, with the testing temperature raising, this bonding effect is weakened to some extent and thus displays the specific heat capacity dropping from the viewpoint of macro behavior of testing fluids.…”

Stability, Thermophysical, Optical and Photothermal Properties of ZnO Nanofluids with Added Anionic/Cationic Mixed Surfactants

“…10,11 Unlike previous solar collectors, the working fluid can directly absorb solar radiation and convert it into thermal energy, which effectively reduce heat loss and improve solar thermal conversion performance. 12 Black liquid, gas-solid, liquid-solid suspension, molten salt, and its mixture are common working fluids in DASC. But they have drawbacks such as insufficient stability, inferior thermal conductivity, and a lack of optical performance, which limit the popularity and application of DASC.…”