HFO-1234ze is trans-1,3,3,3- tetrafluoroprop-1-ene to which ASHRAE Standard 34 has assigned the nomenclature of R-1234ze(E). The
suffix (E) indicates that it is an isomer. The other isomer (suffix (Z)) is cis-1,3,3,3- tetrafluoroprop-1-ene. The physical
properties of the (E) and (Z) isomers are different: both are ultra low GWP molecules with GWPP<1, but R-1234ze(Z) has a high
boiling point (49.6°F) associated with a higher critical temperature (308.66ºF) and a volumetric capacity roughly 50% lower than
R-1234ze(E), which means it is not a good candidate to replace R-134a. Even if the properties of R-1234ze(Z) could be utilised in
specific applications like high temperature heat pumps, R-1234ze(E) will show operating conditions and applied costs much more in
line with R-134a according to system and compressor sizes.

APPLICATIONS
* Air-cooled and water-cooled chillers
*  District heating and cooling
*  Heat pumps

*  Refrigerators
*  Vending machines
*  Beverage dispensers
*  Air dryers
*  CO2 cascade systems, etc.
 

BENIFITS
HFO-1234yf will make an important contribution to a reduced environmental footprint for automobiles. If adopted in all new cars
sold in the EU, North America, and Japan, every year those cars would have reduced emissions equivalent to using 2.3 to 4.9
billion fewer liters of fuel or driving 24 to 52 billion fewer kilometers. (This is equivalent to using 600 million to 1.3 billion
fewer gallons of fuel or driving 15 to 32 billion fewer miles.)

When comparing HFO-1234yf and CO2 as an automotive refrigerant, HFO-1234yf has very distinct benefits with regard to fuel
efficiency and overall sustainability. CO2 would require a much larger, heavier air conditioning system than what is used in most
cars today, which is contrary to the trend toward smaller, more fuel-efficient, sustainable cars. Lifecycle climate performance
evaluations have also concluded that CO2 is not as efficient as HFO-1234yf in warmer climates, and would therefore contribute
considerably more overall to total greenhouse gas emissions, and even more so as the projected vehicle sales volume in warmer,
developing countries such as India and China continues to increase.