Register to reply

AC refrigerant in cars,greenhouse effect reasoning

Share this thread:
marellasunny
#1
Feb26-14, 07:50 AM
P: 226
I'm a mechanical engineer and am learning about the different refrigerants used.
2 of them seem to be the most popular- R134a(C2H2F4) and R1234yf(C3H2F4).

Why is it that R134a is rated at a Greenhouse effect(GWP) of 1430 where R1234yf is rated at a GWP of 4?

Both refrigerants produce CO2,I assume.Won't R1234yf produce more of it considering it has more carbon atoms?
Phys.Org News Partner Chemistry news on Phys.org
New molecule puts scientists a step closer to understanding hydrogen storage
Chemists develop new formulation for the generation of green flames
Four billion-year-old chemistry in cells today
Yanick
#2
Feb26-14, 10:57 AM
P: 380
It seems you are misunderstanding the concept of a GWP. I wasn't aware of how this rating is measured/calculated but a quick Google/Wikipedia excursion revealed that GWP is not related to the production of CO2 by a given compound, but is a measure of how much EM energy a given compound will absorb in a certain amount of time relative to the same mass of CO2. The CO2 appears to be arbitrarily set to 1 as a reference.

See the Wikipedia for more information: http://en.wikipedia.org/wiki/Global-warming_potential


Register to reply

Related Discussions
Using the greenhouse effect for energy? General Physics 7
The physics of the greenhouse effect. General Physics 4
Greenhouse Effect Biology, Chemistry & Other Homework 2
How the Greenhouse Gas Effect works Earth 3
Greenhouse effect General Physics 2