There are two gases that are similar R134 and R134a. They both have the same chemical make up which is 2 hydrogen, 2 carbon and 4 fluorine. However in R134 all of the elements stay separated in a
to use an R 134a compressor with the same displacement as used for R 12. However, to obtain the same refrigerating capacity under LBP conditions, it is necessary to select an R 134a compressor with the next higher displacement to the one used for R 12. Fig. 3 - System’s characteristic curve versus compressor’s Effect of condenser fouling is evaluated on the performance of a vapour compression system with refrigerants HFO1234yf and HFO1234ze as an alternative to HFC134a. The condenser coolant temperature has been varied between 35 and 40°C to evaluate the effect of fouling at different condenser temperatures. A simulation model is developed in EES for computing the results. The results have been R134a..Here "a" is used to denote that it is an isomer. R134 and R134a have same chemical formula and atomic weight but different chemical structures. R134 has NBP of about -19 C whereas R134a has a NBP of about -26C. And dont use capital 'A' in R134a …. "A" denotes that the refrigerant is non -azeotropic. ResearchGate commonly used is HFC 134a with a GWP of over 100 years. How-ever, 134a has a short atmospheric lifetime (~14-16 years) making its 20 year GWP over 3000 times that of CO2. If you bought your home refrigerator or your car within the last 10 years, it almost certainly uses HFC 134a to keep your food cold and cool your vehicle. For compari-
The global average surface concentration of CFC-12 in 2000 was 543 pmol mol −1 (parts per trillion, or 1 in 10 12 ), more than double that of CFC-11, the next most abundant; HCFC-22 was present at ground level at 143 pmol mol −1, over five times the concentration of all other HCFCs put together (Prinn et al., 2000; AGAGE, 2002). HFC-134a is
Technician A says the HFO-1234 (R-1234yf) low-side service manifold hose uses a 1/2-inch male refrigerant flare nut at each end. Technician B says HFC-134a (R-134a) low-side service manifold hose uses a 14mm O.D quick - coupler. Who is correct?
The service ports in both systems are quick-connect, but they are taller in the yf systems to avoid cross-contamination. Another difference is that yf Evaporators must meet SAE Spec J2842, which was not an issue in R-134a systems. A final difference is that most (though not all) R-1234yf cars will have a Suction Line Heat Exchanger.
carried out at same conditions. The results reported that hydrocarbon mixtures, propane/butane (60/40 by wt. %) respectively, is good alternative refrigerant to replaces HFC-134a. Talib K. M. and Salam H. H. [7] Have investigation experimentally to test R134a and R600a/R290 mixture as new alternative refrigerants to replace s48vA.
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    • is hfc134a the same as r134a