Performance evaluation of an acrylic mirror booster solar still for neera concentration in jaggery-making industry

Abstract

A single-basin solar still was constructed from locally available materials to concentrate palm tree juice (neera) for jaggery-making application. The performance of the still was tested with and without an acrylic mirror booster on both partially cloudy and clear sunshine days. About 73% of water content from neera was evaporated within 2 days by using the mirror booster technique in clear sunshine days. Distilled water of about 7.26 l was extracted from 10 l of neera with the mirror booster condition. Wind velocity showed a considerable effect on neera juice temperature and water vapour temperature during partially cloudy conditions. The calculated efficiency of the still with the mirror booster technique was 36.53% in clear sunshine conditions. The calculated energy conservation for the neera concentration process by using the mirror booster solar still was about 16408 kJ.

Keywords:

• neera concentration
• energy conservation
• booster mirror
• solar distillation