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Solid-gas equilibrium in chemical heat pumps: the NH3-CoCl2 system.

Author(s) : TRUDEL J., HOSATTE S., TERNAN M.

Type of article: Article

Summary

The existing equilibrium data in the literature for the reaction, CoCl2.2NH3 + 4NH3= CoCl2.6NH3 was obtained at pressures of 1 atm or less. Data at greater pressures were measured in this investigation. The measurements reported were more complex than a single Van't Hoff equilibrium line (hysteresis). Nevertheless, in all circumstances it appears that the conversion of the salt would be a function of temperature. Fixed bed chemical heat pumps normally operate as batch reactors which have different operating conditions in the synthesis and decomposition cycles. As the temperatures of the batch reactors are cycled relatively rapidly in real chemical heat pumps, true equilibrium conditions are not established. Therefore, when the rate of temperature change in the batch reactors is known, the pseudo-equilibrium hysteresis loop data corresponding to the same heating rate can be used. This hysteresis phenomena can make a 15 °C temperature difference in the specifications of the heat transfer equipment.

Details

  • Original title: Solid-gas equilibrium in chemical heat pumps: the NH3-CoCl2 system.
  • Record ID : 2000-0746
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 19 - n. 5
  • Publication date: 1999/05

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