A novel volumetric absorber integrated with low-cost D-Mannitol and acetylene-black nanoparticles for solar-thermal-electricity generation

摘要: Abstract Low-medium temperature phase change materials (PCMs) act as a predominant role in one-sun solar thermal energy conversion and storage, attracting increasing attention recent years. However, highly conductive PCMs relying on the doping of high dose thermally particles would limit light absorption just at its top surface decrease bulk storage density. In this work, we designed volumetric absorber integrated with D-Mannitol (DM) based PCM loaded low concentration (0.05 wt%) acetylene black nanoparticles other than over 5 wt%. Such method maintains enthalpy DM (295.2 kJ/kg) while achieving an enhanced heat transfer hence uniform distribution. Compared to conventional absorbers PCM, significantly reduces difference inside materials, from 103.1 °C 62.7 °C thickness 10 mm. Their photo charge discharge performance was investigated for first time their thermoelectric generator (STEG) system, which show that could reach 198.2 °C bottom corresponding open circuit voltage is 0.65 V. data are better results 135.1 °C 0.45 V, respectively, demonstrating successfully significant enhancement by our absorber. This paper definitely deepens understanding device design applications solar-thermal-electricity systems.