10.1007/s40095-021-00392-2

Using DOE and RSM procedures to analyze and model a spray evaporation type solar still

  • Karima Hijjaji*1,
  • Nader Frikha1,
  • Slimane Gabsi1,
  • Abdelhamid Kheiri1,
  • Mohammed Khalij2,
  1. Laboratory Energy, Water, Environment and Process, National Engineering School of Gabes, University of Gabes, Gabes, 6029, TN
  2. Lemta, CNRS, Université de Lorraine, Nancy, FR

Published in Issue 2021-04-20

How to Cite

Hijjaji, K., Frikha, N., Gabsi, S., Kheiri, A., & Khalij, M. (2021). Using DOE and RSM procedures to analyze and model a spray evaporation type solar still. International Journal of Energy and Environmental Engineering, 12(3 (September 2021). https://doi.org/10.1007/s40095-021-00392-2
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Abstract

Abstract The lower productivity of the conventional solar still requires bringing modifications to this system. The proposed modification in this work consists of coupling water spray and ambient air injection, which may enhance the water–air surface contact area as it plays a crucial role in the performance in such a device and, consequently, increases the still performances. Response surface methodology (RSM) model is derived from an experimental test set up using the design of experiment procedure to investigate the binary interaction effects of the operating parameters, i.e., spraying height, inlet water temperature, and water and air flowrates. Based on RSM results, a simple polynomial statistical model is stated in this investigation to determine and maximize the amount of evaporated water from solar still based on the four considered input factors. An excellent fitting is attained between the predicted results derived from the statistical model and the experimental results. The performance of this model was also validated using the variance analysis approach. The findings indicate that the main influencing parameters in the order of impact on the system productivity is ambient air mass flow, saltwater temperature, sprayed water mass flow and sprayer height. The binary interaction effects of the variables were considered and illustrated for design recommendations. Within the studied ranges, the hourly productivity varies from 1.91 to 7.9 kg/h m 2 for a water temperature between 40 and 70 °C.

Keywords

  • Desalination,
  • Solar still,
  • DOE,
  • Operating conditions,
  • RSM

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