Optimization of the solar brine evaporation process: Introduction of a solar air heater

Abstract

The purpose of this study was to investigate the evaporation process of reject brine by using a solar system. The solar system contained a solar still coupled with a solar air heater (SAH). Solar still had a heated base, which was connected to the solar collector with a copper pipe. The influence of the introduction of the SAH to the system and increased levels of air mass flowrates was investigated. Variations in temperature and solar irradiation were monitored as well as brine evaporation. Introducing the SAH and increasing the air mass flowrate resulted in faster brine evaporation, higher utilization rate of solar radiation, higher brine, and base temperature levels within the solar still compared to the system without the SAH. The mean base temperature of the system with the SAH was 43.46 ± 11.3°C, while that of the system without the SAH was 30.62 ± 7.35°C. The use of the SAH and high air mass flowrates influenced the temperature distribution within the solar still, which affected the evaporation of the brine in a positive way. Introduction of the SAH and high air mass flowrate increased the drying efficiency of the solar system at a level of 120%. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13062, 2019

Productivity of Solar Still Unit Engaged with Waste Energy Source

“…Compared with traditional SSU, Shadi et al [16] achieved an increase in productivity and efficiency due to using a sloping staged still configuration of 28 trays. Poblete et al [17] combined a solar air heater and solar collector with an SSU, while Kabeel et al [18] investigated inclined SSU with traditional solar. Kabeel and Abdelgaied [19] worked on reinforcing the performance of a pyramid SSU by using an absorber surface made from graphite to enable the absorber to store more heat during high solar energy time and get it back to the basin's water during sunset.…”

Numerical investigations of fluid flow and heat transfer characteristics in solar air collector with curved perforated baffles

“…for preheating in saline water desalination in small systems. [2][3][4][5][6][7][8][9] The radiation energy of the sun is absorbed by an absorber plate and then transferred to the air. This heated air can be used further, according to our requirement.…”