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A hybrid solar-assisted adsorption cooling unit for vaccine storage

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  • Dawoud, Belal

Abstract

A concept of a hybrid adsorption cooling unit for vaccine storage utilizing solar energy as a main power supply and a gas burner as an alternative power supply has been developed. The components of the cooling unit have been designed to work under the weathering conditions of Burkina Faso, West coast of Africa according to the requirements of the World Health Organization. For the first adsorber, which is driven by a gas burner, zeolite-13X has been selected. For the second adsorber to be driven by solar energy selective water sorbent SWS-2L has been applied. Water is selected as a refrigerant for both adsorbents. Theoretical investigations of the expected performance of the designed cooling unit have shown a coefficient of performance (COP) of 0.28 for the solar-operated system based on the heat input to the adsorption unit, at the design conditions of Tevap=−5°C, Tcon=55°C, Tads=38°C, Tdes(max)=122°C. For the gas-heated system, also a COP of 0.28 has been estimated at the design conditions of Tevap=−5°C, Tcon=55°C, Tads=38°C, Tdes(max)=280°C. The variations of COP, cooling capacity and the heating power required to operate both systems have been estimated for a broad range of desorption temperatures. It turns out that the SWS-2L/water system is much more sensitive to the operating conditions than the zeolite-13X/water system. The obtained results should serve in designing both control and heating components of the cooling unit.

Suggested Citation

  • Dawoud, Belal, 2007. "A hybrid solar-assisted adsorption cooling unit for vaccine storage," Renewable Energy, Elsevier, vol. 32(6), pages 947-964.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:6:p:947-964
    DOI: 10.1016/j.renene.2006.02.018
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    References listed on IDEAS

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    1. Critoph, R.E., 1999. "Rapid cycling solar/biomass powered adsorption refrigeration system," Renewable Energy, Elsevier, vol. 16(1), pages 673-678.
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    2. An, G.L. & Wang, L.W. & Gao, J. & Wang, R.Z., 2018. "A review on the solid sorption mechanism and kinetic models of metal halide-ammonia working pairs," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 783-792.
    3. Mahesh, A., 2017. "Solar collectors and adsorption materials aspects of cooling system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 1300-1312.
    4. Henninger, S.K. & Munz, G. & Ratzsch, K.-F. & Schossig, P., 2011. "Cycle stability of sorption materials and composites for the use in heat pumps and cooling machines," Renewable Energy, Elsevier, vol. 36(11), pages 3043-3049.
    5. Allouhi, A. & Kousksou, T. & Jamil, A. & El Rhafiki, T. & Mourad, Y. & Zeraouli, Y., 2015. "Optimal working pairs for solar adsorption cooling applications," Energy, Elsevier, vol. 79(C), pages 235-247.
    6. Moreno-Quintanar, G. & Rivera, W. & Best, R., 2012. "Comparison of the experimental evaluation of a solar intermittent refrigeration system for ice production operating with the mixtures NH3/LiNO3 and NH3/LiNO3/H2O," Renewable Energy, Elsevier, vol. 38(1), pages 62-68.
    7. Dakkama, H.J. & Elsayed, A. & AL-Dadah, R.K. & Mahmoud, S.M. & Youssef, P., 2017. "Integrated evaporator–condenser cascaded adsorption system for low temperature cooling using different working pairs," Applied Energy, Elsevier, vol. 185(P2), pages 2117-2126.

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