No. R744 operates on pressures up to ten times higher than R134a. Although it has been used for some time in stationary equipment, developing R744 systems for automotive applications has been a significant engineering challenge, with unique components and system layouts required for this refrigerant.
An experimental based exergetic comparison between R744 and R134a refrigeration cycles. Substitution of R134 with R744 working in a transcritical cycle. Optimization of the transcritical cycle exergetic performances. The exergetic performances of R134a are better than that of R744 (from +20 to +44%).
An environmentally more benign refrigerant for replacing refrigerant R410A includes a majority portion of refrigerant R32 and a minority portion of refrigerant R134a, the volumetric capacity of the replacement refrigerant permitting it to be used as a near or exact drop-in replacement for refrigerant R410A in terms of ...
In heating mode, the performance of R744 HP system is much better than R134a HP system. The R744 HP system with or without battery cooling/heating shows a similar cooling/heating capacity, the COP of the system becomes larger if there is a demand for battery heating in cold weather.
They can and they do. 134a and R12 have both been used in residential air conditioners. In general though it is all about uniformity. The auto industry settled on R12 and later R134. The air conditioning industry settled on R22 and later R410a.
R134a is a potent greenhouse gas and therefore has 1,430 times the warming potential of carbon dioxide. As a result, lower GWP and eco-friendly refrigerant options are already replacing R134a across many industries. New vehicles sold in the United States after 2021 can't use R134 in their air conditioners.
No, the compressor will fail. These two refrigerants have very different properties. One of R22 and R134a is high pressure and the other is low pressure. They don't mix chemically and don't have the same boiling point, leading to inefficiencies and eventual compressor failure.
R-1234yf refrigerant. To date, most auto manufacturers are using the hydro fluoro olefin (HFO) refrigerant R-1234yf as the replacement of choice for R134a.
R744 systems operate at extremely high and dynamic pressures. Even when the system is turned off, the static pressure of R744 is still very high.
There are a few types of refrigerants, and your car is built to receive only one of those types exclusively. Meaning, they are not interchangeable.
Thanks." Most people in the industry consider R134A to be a better refrigerant for a dehumidifier, so I guess if I had to pick one I would probably pick that one. When it comes to refrigerant, the physical properties of the refrigerant are going to determine at what temperatures it's going to work best.
The replacements for R-410A are the two A2Ls, Forane® R-32 and R-454B.
At this point, the use of R744 as a refrigerant began to decline as more and more businesses turned to synthetic gases instead. Years later, it became clear that these new refrigerants were depleting the ozone layer. HFC refrigerants were developed to replace them, which are still used today.
According to its manufacturer, Chemours, use of R-1234yf has grown so much since the refrigerant replaced the long-established R-134a that it's now used in 95% of new cars sold in the U.S. An estimated 220 million cars on global roads are also using it.
R744 (CO2) was first adopted by Mercedes in the S-Class in 2017, although it has since dropped this approach. VW's ID EVs on the MEB platform use R744 in models that have a heat pump. R744, by definition, has a GWP of 1.
A High-Performing Alternative to R-134a
Opteon™ XL10 (R-1234yf) refrigerant is a non-ozone depleting (ODP) hydrofluoroolefin (HFO) option that meets the industry's growing demands for sustainable, safe, and effective solutions.
Why Is R-134A Being Phased Out? When Is the Phaseout Expected to Conclude? Like a lot of '90s relics, R-134A has not aged well. It was known then that 1,1,1,2-tetrafluoroethane could potentially contribute to acid rain and that its ozone layer depletion potential was high.
Possible alternatives to R-134a
Attention is increasingly focused on low-GWP refrigerants that are hydrofluoroolefins (HFO). R-1234yf in particular is often seen as a possible alternative to R-134a. The GWP value of R-1234yf is 4, which means it has a very low global warming potential.
R744 is a high purity carbon dioxide (CO2) based refrigerant gas with a typical moisture content of less than 10 parts per million. The low moisture content enables the refrigerant to work more effectively and, more importantly, have less corrosive impact on your refrigeration systems. CO2 4.0 (99,99%).
Although R-744 is non-flammable, its high pressures, toxicity in high concentrations and potential for dry ice formation must be considered when applying and handling it.
The critical point of R744 is only 31°C/1,055 psig, a relatively low temperature for a refrigerant. Above the critical point the pressures and temperatures are independent of each other. R744 systems operating above this point are said to be in “supercritical” mode.
The US EPA is to ban a host of high GWP refrigerants including R404A, R134a, R407C and R410A in certain new products from as early as January 1, 2021.
Mixing refrigerants is always a no-no.
As of January 1, 2020, production and import of R22 refrigerant will be illegal in the United States. Of course, continued use of your air conditioner (AC) or heat pump system using R22 refrigerant is allowed.