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Vapour pressure of alkitrate working pairs for absorption refrigeration cycles with high temperature driving heat.

Author(s) : ÁLVAREZ M., BOUROUIS M., SALAVERA D., et al.

Summary

Aqueous alkaline nitrate and nitrite solutions (called alkitrate) are promising working fluids for high temperature absorption cycles. Davidson and Erickson (1986a) proposed using aqueous solutions of three alkali metal nitrate salts - namely, lithium nitrate (LiNO3), sodium nitrate (NaNO3), and potassium nitrate (KNO3) - to extend the upper temperature limit of absorption systems to 260ºC or above. Vargas et al. (2008) conducted an experimental study on the solubility of 21 alkitrate samples. The working pair H2O-(LiNO3 + KNO3 + NaNO2) with a relative absorbent mass concentration of (53:35:12) showed the highest solubility. This paper describes the development of new absorbents for high temperature absorption cycles. They are stable at high temperatures, noncorrosive, and can take advantage of the high temperature of the heat source. Vapour pressure measurements of the two alkitrate working pairs mentioned were taken using a static method between 333.15 and 473.15 K at 20 K intervals. The salt concentration was varied from 50 to 95%.

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Pages: 2010-2

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Details

  • Original title: Vapour pressure of alkitrate working pairs for absorption refrigeration cycles with high temperature driving heat.
  • Record ID : 2010-1867
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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