is this homework?

Start with this.

My first thought would be to start with a Pressure vs Enthalpy curve for the refrigerant in question and then go from there. At that point it's heat transfer but I'm not aware of any all-encompassing equation for this. It's probably manufacturer specific with how much heat comes for the compressor.

Hello again,

I could not figure any way to compute the numbers with the date I got, but, after some research online, I now think that the refrigerant temperature, in heating mode, ought to be about 50 deg C (122 deg F) when outside ambient temperatures are at 7 deg C (45 deg F)

Just took some measurements with a K-thermocouple device I have put together.
Outside ambient temp: 15 C (59 F)
Probe temp (photo 1): 50 C (122 F)
Probe temp (photo 2): 60 C (140 F)

Should I surmise that the refrigerant temperature as it enters the indoor unit will be a bit over 60 C (140 F) in this case ?

Hopefully this is not homework, but here is a hint: knowing the refrigerant type, find the compressors working pressures. The rest should be easy if you know your thermodynamics.

Well, that's the main issue i guess, don't know the working pressure. Someone in my area suggested that it ought to be in the 29.5 - 30 bar range for the usual AC units around here having my specs, which corresponds to about 50 degrees C - http://www.csgnetwork.com/r410apresstempconv.html

P.S. why do you guys keep mentioning "homework", is this forum anti-homework ? It is not, btw, I am past homework age.

"I could not figure any way to compute the numbers with the date I got, "

That's because you didn't know pressure or temperature of the chiller section.

Yes we're anti homework type questions and the style of the question was a bit suspicious.

But glad you've found the answer by some practical measurement.

Differential temp of 45 C sounds about right. Most A/C system struggle to reject heat once you go past about 50C air temp to deliver 10C cool air so the reverse looks right as well.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Got it!

And thanks for the confirmation as well