Abstract
The objective of the study was to evaluate diverse and known types of heat transfer fluids (water, oil and glycerin) commonly used in solar thermal systems, in this work denoted as base fluids, with respect to them, but with the addition of biosynthesized metal nanoparticles. It was considered a prototype of solar heating systems by thermosiphon in the application-experimental phase assisted by halogen light (with wavelengths ranging from deep infrared to violet). The process of biosynthesis or green synthesis of silver nanoparticles (NP Ag) was from the precursor of silver nitrate (AgNO3) and using as a reducer the alcoholic extract from agroindustrial residues of the wine production, obtaining colloids with high monodispersity and with sizes between 30 and 40 nm. (spherical geometry). The results suggest a greater increase in heat absorption capacity when biosynthesized silver nanoparticles are added to the oil, which managed to have a heat capacity of 3519.41 J/kg°C.
Highlights
At present there is a vital interest in solar-based systems, since thermal energy [1] can be obtained for different applications such as generating steam or hot water to processes [2]; on the other hand, the performance of the fluids that are commonly used in solar collectors has a low thermal conductivity [3] and reduced capacity of solar radiation absorption, in addition to its operation it is required the use of fossil fuels [4], main source of greenhouse gases which promotes global warming causing damage to climate, environment and human health [5]
The results are the result of the evaluation of the process of green synthesis or biosynthesis of silver nanoparticles, for this case the residues of the wine production were used at a concentration of 1 mM
The nanoparticles obtained were evaluated by the UV-Vis spectrophotometry technique, obtaining exactly the location of the plasmon floor and its proper absorbance, which suggests at first the presence of silver nanoparticles; The colloid was evaluated by the Transmission Electron Microscopy (TEM) technique which revealed the approximate geometry and size
Summary
At present there is a vital interest in solar-based systems, since thermal energy [1] can be obtained for different applications such as generating steam or hot water to processes [2]; on the other hand, the performance of the fluids that are commonly used in solar collectors has a low thermal conductivity [3] and reduced capacity of solar radiation absorption, in addition to its operation it is required the use of fossil fuels [4], main source of greenhouse gases which promotes global warming causing damage to climate, environment and human health [5] For these reasons, it is desired to increase the performance of such devices using nanoparticles [6] dispersed in bionanofluids [7], carrying out experimentation processes and application analysis in order to evaluate their positive effect on solar heating systems. Regarding green synthesis or biosynthesis, there are a variety of techniques which have come to determine an efficient influence of organic radicals such as anthocyanins and reducing sugars responsible for the process of reducing the precursor agent, which is how they have used an extract in the aqueous state of cranberry (Vaccinium corymbosum L.) [15], obtaining nanoparticles with spherical geometry and diameters of 9.74 and 13.67 nm, with moderate monodispersity, but high stability, becoming an alternative of sustainable synthesis unlike inorganic or chemical that causes a high environmental impact for being polluting
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