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Study of R-1336mzz(Z), R-1336mzz(E), and R-1233zd(E) stereoisomerization at elevated temperatures.

Number: 1259

Author(s) : KUJAK S., LEEHEY M. H., COLLINS C.

Summary

Decarbonization efforts to reduce the use of fossil fuels for both comfort and process heating has challenged traditional vapor compression heat pump systems to be run at temperatures above traditional comfort cooling and refrigeration applications. These elevated temperatures introduce new challenges for the refrigerant and lubricant system, specifically long-term chemical stability of the working fluids. In some cases, application temperatures being proposed are at or near the traditional ASHRAE 97 highly accelerated test temperature of 175°C(347°F) for comfort applications. Because of this, new standard testing conditions using Arrhenius theory may need to be applied to select proper test temperatures to understand the long-term chemical stability and equipment reliability risks of these systems.
AHRTI (Air-Conditioning Research Technology Institute), with funding from the US Department of Energy Building Technology Office, and NYSERDA (New York State Energy Research & Development Authority) sponsored the second phase of the AHRTI Project 9016 to continue the study of Low GWP (global warming potential) refrigerants. Phase 2 of this project expanded upon the chemical stability testing with more system materials of construction and included material compatibility of common non-metallic materials used in refrigerant containing systems. This expanded testing included understanding the impact on stereoisomerization of R-1336mzz(E&Z) when subjected to highly accelerated life tests (HALT) with and without various materials. The authors tested R-1233zd(E) in conjunction with this testing through funding from their employer.

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  • Original title: Study of R-1336mzz(Z), R-1336mzz(E), and R-1233zd(E) stereoisomerization at elevated temperatures.
  • Record ID : 30033593
  • Languages: English
  • Subject: Environment
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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