R 404a

[taz24]

Why can not we think in terms utilising NH3 or CO2. Both are natural gas, and by proper application can use them for different applications.

I do actualy agree with you on some points.
Natural gases are more environmental friendley and do not suffer with glide.
But economics come into the design equation.
If NH3 and CO2 were easily designed, installed, maintained and cost effiecent then all plants would run with it.
NH3 and CO2 have there own problems they have advantages and disadvantages just like all refrigerants.
If you are looking for one refrigerant that will do all then in my oppinion you will not find one.
We were a lot better off with R12, R22 and R502.
Then Amonia and specialist gasses made up the differance.
But for reasons we all know of the three best gases are banned and other ones have replaced them.
Economics again I'm affraid.
I agree with most of what you say. But I feel you are looking for a simplistic answer to a very complex issue.

I have said it before on this thread and I stand by my coments that the glide in 404a is so small that it can almost be discounted.
I have worked with all the refrigerants on the market and I was involved in the replacement of r12 and 502 for some very horrible refrigerants.
For me 404a is a reasonable refrigerant that covers a hugh temp range and is easy to work with.

Just my oppinions from my own personal experience.

Cheers taz.