Manufacturer Extended Performance Data
Manufacturer Extended Performance Data
(OP)
The "extended performance" data published by manufacturers is apparently linear. In the back of Manual S they show a linear equation to recreate performance data tables.
When you plot the actual published performance data on a graph, it is also - apparently - linear.
However DuPont published an interesting .pdf that shows R410a after about 105F ambient starts to drop off in a VERY non-linear manner.
http:/ /refrigera nts.dupont .com/Suva/ en_US/pdf/ k05738.pdf
(See page 2).
So what can I conclude except the manufacturer performance data is misleading above 105F?
What do you think.
When you plot the actual published performance data on a graph, it is also - apparently - linear.
However DuPont published an interesting .pdf that shows R410a after about 105F ambient starts to drop off in a VERY non-linear manner.
http:/
(See page 2).
So what can I conclude except the manufacturer performance data is misleading above 105F?
What do you think.





RE: Manufacturer Extended Performance Data
RE: Manufacturer Extended Performance Data
a) An existing R-22, 5 ton residential unit is replaced.
b) The new R-410a system does not cool as well at high temperatures.
c) Why. It seems to keep happening.
I have plotted 30 published extended performance data from a single manufacturer, and found no unit in the past 40 years deviates from the average performance by more than 2,500 BTUs at any outdoor ambient temperature (published data from 75F through 125F).
However I still am puzzled why the performance data are all straight lines, when R-410a clearly loses capacity within the published data ranges.