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Ultralow temperature freezer changes with rising ambient temperatures.

Number: 1179

Author(s) : SCHUTTE A. J.

Summary

Ultra-low temperature (ULT) freezers maintain storage temperatures of -50°C to -86°C in ambient conditions ranging from 16°C to 32°C. Freezers with cascade refrigeration systems have been used for decades to preserve cultures, vaccines, samples, specimens, and viruses. Typically, these ULT freezers are stand-alone units, and large institutions operate freezer farms containing hundreds of freezers. Climate change has contributed to an increase in average global temperatures and more frequent hightemperature extremes, such as heatwaves. This paper examined the impact of rising temperatures on ULT freezers. Three key changes were identified: a decrease in efficiency, an increase in heat load, and an increase in component operating temperatures. These changes were investigated using a 400-litre freezer, which maintained a storage temperature of -85°C at ambient temperatures of 20°C and 33°C. The evaluation included the power profile, the pressures for both stages, and the temperature in the compressor compartment.

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Pages: 12 p.

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Details

  • Original title: Ultralow temperature freezer changes with rising ambient temperatures.
  • Record ID : 30034210
  • Languages: English
  • Subject: Technology
  • Source: 1st IIR International Conference on Refrigeration Adapting to Rising Temperatures
  • Publication date: 2025/08
  • DOI: http://dx.doi.org/10.18462/iir.adaptation.2024.1179

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