NGHIÊN CỨU SỬ DỤNG THẤU KÍNH FRESNEL VÀ COLLECTOR CHÂN KHÔNG TRONG CHƯNG CẤT NƯỚC MẶN QUY MÔ NHỎ

Abstract

This study presents a small-scale seawater distillation system that uses a Fresnel lens as a
solar radiation concentrator to supply freshwater for areas with limited clean water. The setup includes
a 300×300 mm Fresnel lens, a vacuum collector and a condenser, arranged so that the focal spot of the
lens falls directly on the vacuum collector. Experiments were carried out under typical sunny conditions
in April, while solar irradiance, ambient temperature and distillate output were recorded over time. The
results show that the system runs steadily and produces about 150 ml of freshwater per day for the given
lens area. The device is built from commonly available materials, has a simple design and requires no
energy cost during operation. These features suggest that the system has practical potential for coastal
households, especially if the collecting area and condensation unit are further optimized.