Mass transfer correlation for evaporation–condensation thermal process in the range of 70 °C–95 °C

Maria Eugênia Vieira da Silva, Klemens Schwarzer, Bernhard Hoffschmidt, Frederico Pinheiro Rodrigues, Tarik Schwarzer and Paulo Alexandre Costa Rocha

Renewable Energy, 2013, vol. 53, issue C, 174-179

Abstract: This article presents expressions for the Sherwood number as a function of the Schmidt and Grashof numbers for the evaporation–condensation thermal processes in water at temperatures ranging from 70 °C to 99 °C. The aim is to predict the condensation rate in these processes using temperature data. To collect experimental data to develop the expressions, a one-stage thermal desalination unit was built with controlled temperatures. In the measurements, water evaporation temperature ranged from 20 °C to near boiling, at atmospheric pressure. By using a well thermally insulated unit, all losses were minimized and only drop back losses, which represent drops that do not reach the collection flow channel, were presented. These losses were reduced by the condensation surface tilt angle, which facilitated the flow of condensate. The measured temperatures and condensation rates allowed the calculation of the mass transfer coefficient and the Sherwood number, considering the average distance between the plates as the characteristic length. To estimate the constants in the expression for the Sherwood number, a non-linear regression model was implemented for 698 data points. The condensation surface tilt angles were: 10°, 14°, and 16.8°. The results show that the expressions are more adequate for a temperature range of 70 °C–95 °C, where there is a lack of more information in the literature.

Keywords: Sherwood number; Evaporation–condensation process (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148112007136
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:53:y:2013:i:c:p:174-179

DOI: 10.1016/j.renene.2012.11.010

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().