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Test results of solar thermal refrigerators for cooling vaccines in hot climates with a double-lift adsorption cycle.

Number: 0351

Author(s) : KÜHN R., FISCHER C., MÄHNE K., CHAUHAN P., GÖLLER C., NEZIR U., ROMER J., WITT B.

Summary

In the paper at hand, test results of a solar heat driven off-grid medical refrigerator for hot climates of up to 43°C ambient temperature are presented and discussed. In a previous paper, test results of a solar thermal medical refrigerator for temperate climates (32°C ambient temperature) were presented. The recent refrigerator is cooled by a compact-size double-lift adsorption cycle with a simple control system. In contrast to other solar off-grid adsorption refrigerators, hot water from a standard solar thermal collector provides the energy required for the cooling cycle. This is sufficient even at high ambient temperatures due to the double-lift cycle, which lifts the vapor from the evaporator to the condenser pressure level in a two-stage adsorption process. Water and Silica gel are used as working pair.
Firstly, the configuration of Coolar’s double-lift adsorption system is introduced. Then test results are presented and discussed to infer potential advantages and drawbacks of the system.
The refrigerator shows a sufficient cooling capacity and temperature stability within 2 to 8°C at a constant ambient temperature of 43°C, which is the benchmark given by the World Health Organization’s (WHO) Performance, Quality & Safety process for off-grid vaccine refrigerators for hot climates. Furthermore, stable cold room temperatures between 2 and 8°C were achieved also during field tests under real weather conditions.

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Pages: 11

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Details

  • Original title: Test results of solar thermal refrigerators for cooling vaccines in hot climates with a double-lift adsorption cycle.
  • Record ID : 30031313
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0351

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