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Evaluation of lower GWP refrigerant blend for R23 and blends thereof in ultra-low temperature refrigeration applications.

Number: 2320

Author(s) : NAYAK G., PETERSEN M., KUJAK S., LYDICK T.

Summary

Ultra-low temperature refrigeration applications for medical or intermodal applications among others have mainly relied on R-23 or blends with R-116 forming R-508A or R-508B. All these options have very high global warming potential and the search for alternatives that can provide similar operating characteristics and performance with a lower GWP has been difficult. R-508B is used in the low temperature stage of the cascade refrigeration cycle of ULT freezer units used for medical storage applications for tissue samples or vaccine handling. R-473A has been proposed as an option for ULT applications with a GWP of less than 2000. Refrigerant blend evaluations in ULT systems have shown that R-473A has superior performance characteristics down to evaporation temperatures of about -65C. However, many ULT applications require lower evaporation temperatures to maintain cabinet temperature levels of about -85C.
This paper investigates the experimental evaluation of a medical cascade refrigeration ULT freezer system that utilizes R-449A in the high temperature stage and R473A in the low temperature stage. Characteristic performance and operating parameters such as bottom out temperature, pull down performance and energy consumption are evaluated and compared to a representative baseline system using R-508B in the low stage.

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Pages: 9 p.

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Details

  • Original title: Evaluation of lower GWP refrigerant blend for R23 and blends thereof in ultra-low temperature refrigeration applications.
  • Record ID : 30033179
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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