Potentially acceptable substitutes for the chlorofluorocarbons: Properties and performance features of HFC-134a, HCFC-123, and HCFC-141b

Conference · Mon May 01 04:00:00 EDT 1989 · International Journal of Thermophysics; (USA)

OSTI ID:5568606

Sukornick, B ^[1]

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1. Allied-Signal Inc., Buffalo, NY (USA)

Potentially acceptable substitutes are known for CFC-11 and CFC-12 - the most important chlorofluorocarbons. HFC-134a could replace CFC-12 in air-conditioning and refrigeration and both HCFC-123 and HCFC-141b show promise as CFC-11 substitutes. The replacement molecules all have significantly reduced greenhouse and ozone depletion potentials compared to their fully halogenated counterparts. HCFC-123 is theoretically a less efficient blowing agent than CFC-11, but 141b is more efficient. Results from experimental foaming tests confirm these relationships and show that initial insulating values are slightly lower for 141 b and 123 than 11. Both substitutes are nonflammable liquids. Based on its physical properties, HFC-134a is an excellent replacement candidate for CFC-12. In addition, it is more thermally stable than CFC-12. A new family of HFC-134a compatible lubricant oils will be required. The estimated coefficient of performance (COP) of 134a is 96-98% that of CFC-12. Subacute toxicity tests show HFC-134a to have a low order of toxicity. HCFC-123 reveals no serious side effects at a concentration of 0.1% in subchronic tests and the inhalation toxicity of 141b is lower than that of CFC-11 based on a 6-h exposure. Chronic tests on all the new candidates will have to be completed for large-scale commercial use. Allied-Signal is conducting process development at a highly accelerated pace, and they plan to begin commercialization of substitutes within 5 years.

• OSTI ID: 5568606
• Report Number(s): CONF-880606--
• Conference Information: Journal Name: International Journal of Thermophysics; (USA) Journal Volume: 10:3
• Country of Publication: United States
• Language: English

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HALOGENATED ALIPHATIC HYDROCARBONS
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ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
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PHYSICAL PROPERTIES
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TOXICITY
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