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Design of 5 mm copper tube heat exchangers for display cabinets with R404A.

Number: 2331

Author(s) : SONG K., GAO F., SHABTAY Y.

Summary

Charge reduction is a subject of ongoing research on refrigerated display cabinets. The present paper describes design principles for display cabinets that use copper tubes. In one case study of display cabinets using R404A as a refrigerant, the heat exchanger of the original refrigeration system made from 9.52 mm diameter copper tubes is replaced with an equivalent capacity heat exchanger made from 5 mm diameter copper tubes with enhanced internal surfaces. Performance was optimized using HXSim software, an easy-to-learn simulation tool available from the International Copper Association. The case study demonstrates design principles and presents various results for a typical 2.2 kW display cabinet refrigeration system that uses R404A as a refrigerant. Reduced-charge systems use tube-fin heat exchangers with distributed flow paths and 5 mm copper tubes. The optimized system uses 14.3 percent less charge than the original system. As hydrofluorocarbon (HFC or F-Gas) refrigerants are phased out or tightly regulated globally, manufacturers are seeking to reduce refrigerant charge, eliminate leaks and facilitate recycling. The present case study quantifies how much charge reduction can be realized using smaller-diameter copper tubes in refrigeration equipment with a conventional refrigerant. Similar design principles and heat exchanger simulations could also be used in the design of refrigeration equipment that uses low-GWP refrigerants, including natural refrigerants and HFO-HFC blends.

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Details

  • Original title: Design of 5 mm copper tube heat exchangers for display cabinets with R404A.
  • Record ID : 30030661
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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