R1234ze(Z)和R1234ze(E)的區別在于它們是同一制冷劑的兩種不同異構體，這意味著它們具有相同的分子式但分子結構不同。 這導致不同的物理和熱力學性質，例如沸點、臨界溫度和體積容量。
R1234ze(Z) 的沸點更高，為 9.8°C，而 R1234ze(E) 的沸點為 -18.95°C。 這意味著R1234ze(Z)不適合低溫應用，但可用于高溫熱泵1。 R1234ze(E) 的沸點較低，這使得它與常用制冷劑 R134a 更相似2。
與 R1234ze(E) 的 109.4°C 相比，R1234ze(Z) 的臨界溫度也更高，為 153.7°C。 這意味著 R1234ze(Z) 可以在更高的壓力和溫度下運行，這可能會提高某些系統的效率1。 R1234ze(E) 的臨界溫度較低，這限制了其工作范圍3。
R1234ze(Z)的容積比R1234ze(E)低，這意味著它需要更多的質量流量和更大的壓縮機才能達到相同的冷卻效果1。 R1234ze(E)具有更高的容積，這使得它與現有設備更兼容2。
R1234ze(Z) 和 R1234ze(E) 的全球變暖潛勢 (GWP) 都非常低，分別為 7 和 6，這意味著它們對環境的影響極小12。 它們也是無毒且輕度易燃的，屬于 ASHRAE 安全等級 A2L12。
The difference between R1234ze(Z) and R1234ze(E) is that they are two different isomers of the same refrigerant, which means they have the same molecular formula but different molecular structures. This results in different physical and thermodynamic properties, such as boiling point, critical temperature, and volumetric capacity.
R1234ze(Z) has a higher boiling point of 9.8°C, compared to R1234ze(E)'s -18.95°C. This means that R1234ze(Z) is not suitable for low-temperature applications, but can be used in high-temperature heat pumps1. R1234ze(E) has a lower boiling point, which makes it more similar to R134a, a commonly used refrigerant2.
R1234ze(Z) also has a higher critical temperature of 153.7°C, compared to R1234ze(E)'s 109.4°C. This means that R1234ze(Z) can operate at higher pressures and temperatures, which may improve the efficiency of some systems1. R1234ze(E) has a lower critical temperature, which limits its operating range3.
R1234ze(Z) has a lower volumetric capacity than R1234ze(E), which means that it requires more mass flow and larger compressors to achieve the same cooling effect1. R1234ze(E) has a higher volumetric capacity, which makes it more compatible with existing equipment2.
Both R1234ze(Z) and R1234ze(E) have very low global warming potentials (GWP) of 7 and 6, respectively, which means they have minimal impact on the environment12. They are also non-toxic and mildly flammable, belonging to the ASHRAE safety class A2L12 .
