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Refrigerant replacement from HFC to HC in a medical ultra-low temperature appliance: experimental and simulation approach.

Number: 2305

Author(s) : HENSE D., KARNOPP J.

Summary

This work explores the migration of single speed HFC compressor to variable speed HC compressor in a cascade refrigeration circuit for Ultra Low temperature freezer application. In this way, the paper first describes a case study to replace HFC refrigerant pair R404A/R508B by low GWP alternative HC R290/R170. In order to define the best average working condition for the HC pair with variable speed compressors, a semi-empirical model is applied. The results showed that some circuit modifications are important to optimize system performance and keep the HC refrigerant charge below 150g. Experimental data indicated that to take the most advantage of the VCC technology it is paramount to optimize the compressor working speed for given appliance. As a final result the a reduction of 41.5% in energy consumption was obtained and allowed the system to reach 8.6% lower energy consumption than Energy Star target.

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Pages: 9 p.

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  • Original title: Refrigerant replacement from HFC to HC in a medical ultra-low temperature appliance: experimental and simulation approach.
  • Record ID : 30030652
  • Languages: English
  • Subject: Technology, HFCs alternatives
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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