Abstract
A novel multi-effect vertical concentric tubular solar brackish water desalination device is introduced in present study. The device consists of four closely spaced concentric pipes, in which the feed water gets preheated by hot brine water to guarantee the evaporation efficiency. An experimental investigation and analytical analysis were carried out to signify the effect of carrier gas-water vapor mixture on productivity enhancement of the device. Different carrier gases were used in the performance evaluation: carbon dioxide, helium, nitrogen, oxygen, air and argon. The water yield and the top/bottom temperature values of condensation surface of the device with different carrier gases were tested. In addition, the present investigation is presented an approach to predict the theory yield based on the internal heat and mass transfer mechanism. The experimental results indicate that, when the heating temperature is 80 °C and the carrier gas is helium, the water productivity rate can reach to 1.19 kg/h. It is increased by 30.76% than the carrier gas of air. The numerical results had been calculated and a consistent agreement with the experimental results had been obtained of different operation temperatures. The Dv under different heating temperature were obtained according to the experimental results.
Highlights
Safe and pure drinking water is an important need for life existence and sustainability
The multi-effect vertical concentric tubular solar brackish water desalination system is compounded of brackish water tank, vacuum tube solar collector, two water collection tanks and four circular stainless steel pipes, which form three annulus sealed spaces that are used as the first, second, and third-effect distillation chambers respectively, while the innermost pipe is filled with hot fresh water as a heat source
To investigate the effect of different carrier gases and heating temperature on the water productivity enhancement of the device, a series of tests were performed in steady state conditions within the range of temperature between 50 oC to 80 oC with a temperature step of 5 oC
Summary
Safe and pure drinking water is an important need for life existence and sustainability. A substantial amount of research work has already been carried out to redesign the structure of TSS and to attempt for enhancement of heat and mass transfer between the evaporation surface and condensation surface It appears that the role of thermophysical and transport properties of the different carrier gases and their effect on the productivity enhancement of the vertical solar desalination device has been left almost completely unknown. We propose to improve the yield of the multi-effect vertical concentric tubular solar brackish water desalination device by using different carrier gases relative to air is analyzed in detail use a numerical model of gas-vapor mixture with natural convection to verify. The multi-effect vertical tubular solar brackish water desalination device presented in this paper can reuse the latent heat of condensation successfully and guarantee larger effective evaporation area to gain high energy utilization efficiency
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