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Modelling and performances of a deep-freezing process using low-grade solar heat

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  • Le Pierrès, Nolwenn
  • Mazet, Nathalie
  • Stitou, Driss

Abstract

A solar deep-freezing process has been designed. It aims at cooling down a cold box to about −20°C, using simple flat plate solar collectors operating at 70°C. This original process involves two cascaded thermochemical systems based on the BaCl2/ammonia reaction. Its working mode is discontinuous as it alternates between a regeneration mode during daytime and a cold production mode during nighttime. A global dynamic model involving the various system components allows the simulation of the process; it predicts the evolution of the components temperatures and the rates of chemical reactions of the system. It also allows the dimensioning of the system components to maintain a 500l cold box at −20°C during the 6 sunniest months of the year under typical Mediterranean weather conditions and provide over 80% of the total yearly cooling needs of this box. This requires a solar collector area of 5.8m2 and 39kg of reactive salt. The predicted coefficient of performance (COP) is about 0.1 over the year, and the net solar COP, taking into account the collector efficiencies, is 0.05.

Suggested Citation

  • Le Pierrès, Nolwenn & Mazet, Nathalie & Stitou, Driss, 2007. "Modelling and performances of a deep-freezing process using low-grade solar heat," Energy, Elsevier, vol. 32(2), pages 154-164.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:2:p:154-164
    DOI: 10.1016/j.energy.2006.02.009
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    References listed on IDEAS

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    1. Goetz, V. & Spinner, B. & Lepinasse, E., 1997. "A solid-gas thermochemical cooling system using BaCl2 and NiCl2," Energy, Elsevier, vol. 22(1), pages 49-58.
    2. Srikhirin, Pongsid & Aphornratana, Satha & Chungpaibulpatana, Supachart, 2001. "A review of absorption refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(4), pages 343-372, December.
    3. Dieng, A. O. & Wang, R. Z., 2001. "Literature review on solar adsorption technologies for ice-making and air-conditioning purposes and recent developments in solar technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(4), pages 313-342, December.
    4. Papadopoulos, A. M. & Oxizidis, S. & Kyriakis, N., 2003. "Perspectives of solar cooling in view of the developments in the air-conditioning sector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 7(5), pages 419-438, October.
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    Cited by:

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    2. Wu, J.Y. & Li, S., 2009. "Study on cyclic characteristics of silica gel–water adsorption cooling system driven by variable heat source," Energy, Elsevier, vol. 34(11), pages 1955-1962.
    3. An, G.L. & Wang, L.W. & Zhang, Y.H., 2020. "Overall evaluation of single- and multi-halide composites for multi-mode thermal-energy storage," Energy, Elsevier, vol. 212(C).

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