Solar desalination unit with falling film

Mousa Abu-Arabi, Hasan Mousa, Rania Abdelrahman

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Desalination of water by a solar unit with falling film was investigated. Even distribution of the water film on the collector plays an important role on the amount of desalinated water that can be produced. Several distribution systems were designed and tested. A combination of water distributor and a wick on the plate surface were needed to achieve uniform film on the plate surface. The effect of various parameters such as feed water flow rate, ambient temperature, water salinity and cooling the outer glass surface on the unit productivity was investigated. A linear relationship between the amount of fresh water produced and time is exhibited. On average about 0.6 L/h.m2 of water was produced by the unit during the hot months. Reducing the feed water flow rate and cooling the outer glass surface improved the unit productivity. Cooling the outer glass surface improved the unit productivity by 30%. On the other hand, water salinity adversely affected the unit productivity. The productivity is reduced by 40% upon increasing the salt concentration in feed water to 20,000 mg/L. The quality of the produced water was assessed by measuring its conductivity and it was found to be about 23 μS/cm. An equation to estimate the amount of desalinated water produced from the falling film was derived based on mass and energy balances. The agreement between the theoretical predictions and the experimental results is good.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalDesalination and Water Treatment
Volume3
Issue number1-3
DOIs
Publication statusPublished - 2009

Fingerprint

Desalination
desalination
Water
productivity
Productivity
water
glass
cooling
water flow
Cooling
Glass
Flow rate
distribution system
energy balance
mass balance
conductivity
Energy balance
salt
Salts
prediction

Keywords

  • Desalination
  • Falling film
  • Inclined plate
  • Solar collector
  • Water

ASJC Scopus subject areas

  • Pollution
  • Water Science and Technology
  • Ocean Engineering

Cite this

Solar desalination unit with falling film. / Abu-Arabi, Mousa; Mousa, Hasan; Abdelrahman, Rania.

In: Desalination and Water Treatment, Vol. 3, No. 1-3, 2009, p. 58-63.

Research output: Contribution to journalArticle

Abu-Arabi, Mousa ; Mousa, Hasan ; Abdelrahman, Rania. / Solar desalination unit with falling film. In: Desalination and Water Treatment. 2009 ; Vol. 3, No. 1-3. pp. 58-63.
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