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Energy balances for upward-type, double-effect solar distillers with air flow through the second-effect unit

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  • Yeh, Ho-Ming
  • Chen, Zhi-Fang

Abstract

A multiple-effect solar distiller is more effective than a single-effect unit because it uses the available energy more than once. Considerable improvement in productivity may also be obtained if the water vapor in the last-effect unit is carried away directly by the flowing air. Moreover, since an upward-type solar distiller may create a free-convection effect, it is more efficient than a downward-type unit. The energy balances for upward-type, double-effect solar distillers, with air flow through the second-effect unit, are given in this paper. The air humidity at the condensing surfaces, as well as in the outlet air, was assumed to differ from the saturation value by a factor defined to be a “modified factor”. The effects of various conditions on these modified factors have been investigated experimentally. The use of a computer may facilitate the determination of the theoretical performance under various operating and design conditions.

Suggested Citation

  • Yeh, Ho-Ming & Chen, Zhi-Fang, 1994. "Energy balances for upward-type, double-effect solar distillers with air flow through the second-effect unit," Energy, Elsevier, vol. 19(6), pages 619-626.
    • Handle: RePEc:eee:energy:v:19:y:1994:i:6:p:619-626
    DOI: 10.1016/0360-5442(94)90002-7
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    Cited by:

    1. Sogut, Z. & Ilten, N. & Oktay, Z., 2010. "Energetic and exergetic performance evaluation of the quadruple-effect evaporator unit in tomato paste production," Energy, Elsevier, vol. 35(9), pages 3821-3826.
    2. Haddad, O.M. & Al-Nimr, M.A. & Maqableh, A., 2000. "Enhanced solar still performance using a radiative cooling system," Renewable Energy, Elsevier, vol. 21(3), pages 459-469.
    3. Yeh, Ho-Ming & Ho, Chii-Dong, 2000. "Energy and mass balances in multiple-effect upward solar distillers with air flow through the last-effect unit," Energy, Elsevier, vol. 25(4), pages 325-337.
    4. Syed Noman Danish & Abdelrahman El-Leathy & Mohanad Alata & Hany Al-Ansary, 2019. "Enhancing Solar Still Performance Using Vacuum Pump and Geothermal Energy," Energies, MDPI, vol. 12(3), pages 1-13, February.

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