Experimental Investigation of the Effect of Phase Change (PCM) Materials on the Performance of an Improved Stepped Solar Still

Document Type : Original Article

Authors

Department of Energy, Institute of Science and High Technology and Environmental Sciences. Graduate University of Advanced Technology, Kerman, Iran

Abstract
Desalination of brackish water using solar still is a desirable and attractive option for decentralized and sustainable fresh water production. The author of the present study has recently developed and conducted experimental investigations on an improved stepped solar still. Their experimental results indicate a very good performance of this solar still. However, this unit cannot produce fresh water during the night due to the lack of sunlight. To overcome this problem, storing solar energy during the day and utilizing it at night can be a suitable solution, achievable through the use of phase change materials (PCM). In the present study, the effect of adding paraffin wax as a PCM to the absorber of the improved stepped solar still was experimentally investigated. For this purpose, two improved stepped solar still with identical dimensions and specifications were simultaneously tested, one being simple and the other equipped with the PCM. The experiments were conducted in June 2021 under the climatic conditions of Kerman city. The test results show that using the PCM relatively improves the performance of the desalination unit, enhancing its efficiency by 3.7% to 12% under different design and operating conditions.

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Articles in Press, Accepted Manuscript
Available Online from 12 December 2025

  • Receive Date 06 June 2024
  • Revise Date 30 December 2024
  • Accept Date 19 November 2025