Hi there
Hope you are fine and staying safe
Please, I am contacting you for following topic.
I was starting dealing with non azeotropic fluid, as r449a
I have following concern:
I need to select a cooler for a cold room
Many producers assert to utilize the same td for these refrigerants considering the average glide temperature as refernce TD.
Ex, if with R404a we would have 7K differnece, I am suggested to consider the same td but considering R449a average glide.
My concern is as follows.
If we consider the average glide, at the beginning of the evaporation the td between air and refrigerant will be bigger.
Ex with 449 A, @4.13 bar temperature on gas side is 0°C, while on liquid side is -5.7°C meaning a glide of 5.7K
Average glide will add ex, something around 5.7/2, meaning
At the end at beginning of evaporator we would have not, ex 7K, but almost 9.9K (meaning 7+5.7/2)
Can this difference affect the range of application of these refrigerants, since because of this higher temperature difference we may be in risk of drying unpacked goods in the cold room ?
Would it be enough to me to consider the capacity value or shall I consider also other parameters as the maximum temperature difference as well ?
I have read about fluids with even bigger glide, so that this effect will be augmented.

Please, has anybody any experience or any idea concerning my doubt ?

Thanks, happy Easter and stay safe !