First there should not be more than 2 to 4 degrees higher temp at compressor suction line unless you have a very long line run. Second the accuracy of a K type thermocouple is not better than +/-2 degrees, if you have a good thermal contact to pipe and no wind blowing on, or sun hitting temp sensor. Most common reason for high temp rise on suction line is poor insulation installation or deteriorated insulation on suction line. It is also important to health of compressor to ensure you don't get above 65 degrees F at compressor to ensure compressor cooling. If you are going to mess with TXV adjustments, then measuring at evaporator has more importance.
Does this apply to a piston also?
I really would have liked it if you had put the pipe clamp on the suction line @ the condenser just to prove the point.
Yes that would really be impactful on an actual system especially if lines were run underground in a chase.
First there should not be more than 2 to 4 degrees higher temp at compressor suction line unless you have a very long line run. Second the accuracy of a K type thermocouple is not better than +/-2 degrees, if you have a good thermal contact to pipe and no wind blowing on, or sun hitting temp sensor.
Most common reason for high temp rise on suction line is poor insulation installation or deteriorated insulation on suction line.
It is also important to health of compressor to ensure you don't get above 65 degrees F at compressor to ensure compressor cooling.
If you are going to mess with TXV adjustments, then measuring at evaporator has more importance.