In both examples, the systems had starved evaporators with very high superheats coming back to the compressor, and compressor discharge temperatures with low condensing temperatures..
That's due to the compressor having to work harder, thus generating more heat of compression from compressing the suction pressure.
The system is application that uses R-134a as the refrigerant and has TXV with receiver..
the system may start to fail from worn rings, acid formations, and oil breakdown.
Remember, the actual discharge temperature will be about 75°F hotter, which will bring the compressor's discharge valve to 300°F.
The higher the compression ratio, the higher the compressor's discharge temperature will be and the greater chance for compressor overheating.
the compression ratio would be psia ÷ psia = 250 psia ÷ 25 psia = 10 to 1 or 1.
The higher the compression ratio, the higher the heat of compression and the hotter the temperature will be..
Compressor discharge temperatures reflect all of the latent heat absorbed in the evaporator, the evaporator superheat, all of the suction line superheat, and all of the heat of compression and motor generated heat at the compressor.
It's at the temperature where all of this heat is accumulated and starts being rejected in the discharge line and condenser.
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