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Impact of temperature glide on heat exchanger sizing for low global warming potential refrigerant blends.

Number: 2164

Author(s) : DEAN B., PANSULLA A., ALLGOOD C.

Summary

Globally, with the Kigali Amendment to the Montreal Protocol and other regulatory pressures, the HVACR industry is transitioning to lower Global Warming Potential (GWP) refrigerants. Historically, refrigerants were either single components, such as R-22 (GWP = 1820), or multiple component blends, with little temperature glide, such as R-410A (GWP = 2088) or R-404A (GWP = 3922).
To accelerate the transition away from high GWP refrigerants such as R-404A, thermodynamically comparable solutions will be required to minimize incumbent system design changes. Several new lower flammability (A2L) blends have been developed which include R-454A (GWP = 239), R-454C (GWP = 148), and R-455A (GWP = 146).
This paper will present the results of thermodynamic modeling analysis examining the impact of temperature glide of these new refrigerant blends on the sizing of heat exchangers. Data showing how rating a heat exchanger at its mid-point temperature condition vs its dew-point temperature will highlight the criticality of rating conditions in industry standards when making decisions in both low and medium temperature refrigeration applications. The data presented will include comparison of results from multiple thermodynamic design modeling software packages for both low and medium temperature refrigeration conditions. The modeling software packages used for data generation are ASPEN Plus®, and Cycle D-HX from NIST.

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Pages: 7 p.

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Details

  • Original title: Impact of temperature glide on heat exchanger sizing for low global warming potential refrigerant blends.
  • Record ID : 30033061
  • Languages: English
  • Subject: Regulation
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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