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terminator
18-12-2017, 10:15 PM
You know what guys, I was asked a question about this today just as I was going home and didn't know how to answer.

I've always used deg F when calculating s/heat, as that's just the way I was taught.
I was asked why we don't use dec C in the UK,, as it's generally C that we use for most temp measurements here.

So, lets say we are working in F and looking for a target s/heat on a system of 7f (evaporator), would we still be looking for 7 if converting the pressure / temps to C. In other words, it's just the numerical value we require?

I feel daft asking, but it's never crossed my mind before really.

Brian_UK
18-12-2017, 11:49 PM
Nope, if you work in F stay in F.

Best to work in C as one degree C is near enough one degree Kelvin which is what you should be measuring your superheat or subcooling in.

NH3LVR
19-12-2017, 12:15 AM
Ignorance on this side of the pond?
I thought one degree C was the same as Kelvin.
Then i looked at Wikipedia and am now confused.
Help a Yank out here!

RANGER1
19-12-2017, 12:47 AM
Ignorance on this side of the pond?
I thought one degree C was the same as Kelvin.
Then i looked at Wikipedia and am now confused.
Help a Yank out here!

https://www.thoughtco.com/convert-kelvin-to-celsius-609233

When talking kelvin normally refers to temperature difference which is same scale as deg C.
So superheat in degrees kelvin refers to degrees C.

Brian_UK
19-12-2017, 07:15 PM
Ignorance on this side of the pond?
I thought one degree C was the same as Kelvin.
Then i looked at Wikipedia and am now confused.
Help a Yank out here!Yes, you are of course correct. I was being rather loose with the language, sorry. :mad: