Refrigeration Compression Ratio
Absolute compression ratio from suction and discharge gauge pressures (with altitude correction) and a high-ratio flag for single-stage limits (ASHRAE).
Formula and source
Compression ratio = absolute discharge / absolute suction = (discharge_psig + atmospheric) / (suction_psig + atmospheric); high-ratio flag above about 10:1.
Refrigeration compression ratio = absolute discharge pressure / absolute suction pressure - per the ASHRAE Handbook Refrigeration compressor-performance fundamentals, by name; first-principles.
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