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As shown in Figure 6, the mathematical model can predict reasonably well both the actual values and the trend of the temperature of the air leaving the still. The maximum error of the calculated temperatures compared to measured values is 5°C and occurs in the early afternoon. The average errors in the relative humidity calculation are around 10% with maximum error values up to 20%. In most cases, the computed values are lower than the measured ones. Figure 8 once again confirms that the mathematical model underestimates the moisture in the air leaving the still in the middle of the day. At other times, the predicted and measured computed moisture contents of the outlet air are similar, which shows the observed variations in relative humidity at these times are due to difference between the

In this chapter, a numerical model for calculating basin-type solar water distillation was presented. The model can be used to calculate solar distillation for both passive natural convection and forced convection with external condensers. For passive systems, the numerical model allows to simulate and calculate more complex parameters than previous models. For active-forced convection systems, this model allows the simulations of the heat transfer and mass process inside both the distillation unit and the internal heat exchanger. Comparison of numerical simulation results and experimental results showed that the numerical model achieves the acceptable accuracy in calculating the parameters of the fluid flow inside the distillation and the condenser-type heat recovery as well as estimation of the distillate

predicted and measured air temperatures.

The predicted and measured distillate collected from the condenser of the still.

Distillation - Modelling, Simulation and Optimization

output corresponding to both types of solar distillation.

5. Conclusion

42

Figure 11.

Nguyen The Bao Department of Heat and Refrigeration Engineering, Faculty of Mechanical Engineering, University of Technology, Vietnam National University of Ho Chi Minh City, Ho Chi Minh City, Vietnam

\*Address all correspondence to: drthebao@gmail.com

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
