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Water as an adsorptive for adsorption cycles operating at a temperature below 0 °C

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  • Girnik, I.S.
  • Aristov, Yu.I.

Abstract

From the thermodynamic point of view, water is the best working fluid for adsorptive heat conversion (AHC) cycles. Here we propose to use an aqueous salt solution instead of pure water for preventing its freezing in the evaporator/condenser at a temperature below 0 °C. The thermodynamic aspects of this approach are comprehensively investigated. The comparison with methanol and ammonia is made when possible. The effect of salt solution on the cycle boundary pressures and useful heat is studied for common (cooling and heat storage) and innovative (“Heat from Cold”, HeCol) AHC cycles. The experimental study on water sorption dynamics under the reduced vapour pressure over eutectic solutions of NaCl and CaCl2 shows a significant slowing of desorption (for the HeCol cycle) and adsorption (for the heat storage cycle) at long times. However, the specific power at a 70% conversion (0.3–0.6 kW/g) still remains promising for practical applications.

Suggested Citation

  • Girnik, I.S. & Aristov, Yu.I., 2020. "Water as an adsorptive for adsorption cycles operating at a temperature below 0 °C," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220321447
    DOI: 10.1016/j.energy.2020.119037
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    References listed on IDEAS

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    Cited by:

    1. Aristov, Yu. I., 2022. "Adsorption heat conversion and storage in closed systems: What have we learned over the past decade of this century?," Energy, Elsevier, vol. 239(PB).

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