Inhalation studies were conducted to determine the potential toxicity of HCFC-124. Groups of rats and mice were exposed to HCFC-124 6 hr/day, 5 days/week for 13 weeks at 0, 5000, 15,000, and 50,000 ppm. Subgroups of rats and mice were held for a 1-month recovery period. A functional observational battery (FOB) was conducted on rats at 0, 4, 13, and 16 weeks. Clinical pathology evaluations were ...

R-502 has been the primary refrigerant for low temperature commercial refrigeration applications for many years. The impending phase-out of CFCs dictates its elimination in the very near future. The identification of alternative(s) for R-502 therefore becomes a high priority. This paper addresses the factors to be evaluated in selecting the best replacement and identifies an azeotropic mixture ...

A cubic equation of state for HFC-32/HFC-125 mixtures developed on the basis of our experimental data was used for thermodynamic analysis of refrigeration cycles using this blend. The influence of composition changes on energy efficiency and Total Equivalent Warming Impact (TEWI) was studied. Comparisons of this blend with HCFC-22 and other alternative refrigerants were also carried out. Detail...

Abstract. Emissions of the potent greenhouse gas perfluorocyclobutane (c-C4F8, PFC-318, octafluorocyclobutane) into global atmosphere inferred from atmospheric measurements have been increasing sharply since early 2000s. We find that these emissions are highly correlated with production hydrochlorofluorocarbon-22 (HCFC-22, CHClF2) for feedstock (FS) uses, because almost all HCFC-22 FS is pyroly...

We have investigated the possibility of utilizing various single-walled pristine and doped carbon nanotubes as adsorbents for 1-chloro-1,2,2,2-tetrafluoroethane (HCFC-124) gaseous molecule. Three candidates, including nanotube (CNT), silicon carbide (SiCNT) germanium-doped SiCNT (SiCGeNT) are identified evaluated theoretically. The quantum simulations been performed at density functional theory...

Tests were run with both R-12 and R-l34a in a water calorimeter. Refrigerant 12 was run with mineral oil as the lubricant. Evaporating and condensing heat transfer coefficients were calculated over a range of temperatures. To evaluate the impact of the lubricant on the heat transfer coefficients, a oil separator was added. Tests were then run with the oil separator over the same temperature ran...