Effect of Ag/PVP nanoparticle additives on the specific heat capacity of secondary coolants, based on the water, propylene glycol–water, and isopropanol systems

In this paper, we investigate the effect of adding silver (Ag) nanoparticle coated with polyvinylpyrrolidone (PVP) at an Ag concentration of 0.3 wt% in base coolant fluids, which are based on the “water,” “propylene glycol–water,” and “isopropanol” systems, on the specific heat capacity of secondary coolants across a wide temperature range. During the synthesis of nanofluids, the specific heat capacity of secondary coolants varied as follows: for the water system, the heat capacity decreased by an average of 8%; for the propylene glycol–water system, variations in the heat capacity did not exceed 2%; for the isopropanol system, a 6% increase in the heat capacity was observed. The data obtained on the specific heat capacity of secondary nanocoolants can be used not only when calculating processes and equipment, but also when developing new materials with the required properties.