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Pressure losses in circuits with non-freezing mixtures.

Tlakové ztráty v okruzích s nemrznoucí smesí.

Author(s) : HEMZAL K., LERL Z.

Type of article: Article

Summary

Physical parameters of non-freezing liquids (mixtures of water and suitable additives with freezing temperature lower than 0°C) increase the pressure losses in the water circuits and worsen the heat transfer in the tubes of heat exchangers. The increase in flow resistance in comparison to water is significant, especially at low temperatures and high concentrations of additives. The article presents the analytical relationship between the density and viscosity with respect to the additive concentration (propylene glycol) and mixture temperature. The data are applicable to calculations of pressure losses by friction for which the algorithm is presented. In conclusion, the calculation example and an analysis of the results' sensitivity to deviations of input quantities are also presented.

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Format PDF

Pages: 139-142

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Details

  • Original title: Tlakové ztráty v okruzích s nemrznoucí smesí.
  • Record ID : 2006-2933
  • Languages: Czech
  • Source: Vytápení Vetrání Instalace - vol. 15 - n. 3
  • Publication date: 2006

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