Originally Posted by
PaulL
Hello there
I am having more and more request of systems no more utilizing R404A but R407F and R404A.
I would stay stick on R404A, or R507, nonetheless the request of systems with these two refrigernts is increasing.
Therefore I have started to analyze these two new refrigerants, reading threads and googling it
Basically what I have noticed is :
- performance of the two new refrigerants (R407A, R407F) are basically equivalent.
- condenser capacity is lower than R404A around 15%, according to the td considered
- evaporator capacity is higher than R404A around 10% according to the td considered.
- R407F has high discharge temperatures, so that it seems that low temperature applications are difficoult. No problem, just take take in consideration you will need additional cooling like fan at the compressor head, CIC system (like Bitzer) has it...It will be as you had use R22
What really worries me in utilizing these two refrigerants is that they have glide (4-6K). No problem if you use dry-expansion feed
are they suitable to freezing application ?
I can see some potential problems, for example: in the coil there are colder parts where frost can form faster. If you are worry about that use a medium evaporating temperature, between the bubble and dew point
Please may I ask you if you have an experience on this ?
Many thanks