Abstract
Heat transfer coefficients of boiling water in free convection lie in installed plants between 2.103 W/m2K and are rarely larger than 5.104 W/m2K, whereas those of ammonia, alcohols, paraffins, and other organic substances seldom reach values over 1500 W/m2K. In flooded refrigerant evaporators, which are usually operated in the transition region between single-phase free convection and nucleate boiling, to avoid too large temperature differences heat transfer coefficients may even lie only between 500 and 800 W/m2K. On the other hand, the heat transfer coefficients on the side of the heating agent can be significantly larger, especially if heat is supplied there by condensation of a superheated vapor or convectively by water. The decisive thermal resistance is then on the boiling side, and one should look for measures to reduce this thermal resistance.
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© 1992 Springer-Verlag Berlin Heidelberg
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Stephan, K. (1992). Enhancement of Heat Transfer During Boiling. In: Heat Transfer in Condensation and Boiling. International Series in Heat and Mass Transfer. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-52457-8_16
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DOI: https://doi.org/10.1007/978-3-642-52457-8_16
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