Reciprocating refrigeration compressor discharge temperature control, high temperature trip and root cause analysis

Reciprocating refrigeration compressor discharge temperature control, high temperature trip and root cause analysis

Discharge temperature reflects compression process state; excessive discharge temperature decomposes refrigerant and lubricant, generating carbon deposits inside cylinder. The maximum allowable continuous discharge temperature is 145℃; high temperature protection shall trigger shutdown when discharge temperature reaches 155℃. Xiteliduo reciprocating compressor installs PT100 temperature sensor on discharge manifold; sensor deviation over ±4K needs calibration or replacement. Small 4-cyl reciprocating refrigeration compressor high discharge temperature usually comes from insufficient suction superheat control or dirty condenser. Medium 4-cyl reciprocating refrigeration compressor high temperature fault may be caused by excessive compression ratio; low suction pressure raises gas heating during compression. Large 4-cyl reciprocating refrigeration compressor carbon deposit formed under long-time high temperature will stick valve reed and degrade volumetric efficiency. Large 6-cyl reciprocating refrigeration compressor partial unloading operation changes heat distribution; individual cylinder may run at higher discharge temperature than others. Many operators only restart unit after high temperature trip without root cause analysis. Repeated high-temperature operation shortens valve service life by 50%. Single-unit two-stage refrigeration compressor high-stage discharge temperature is much higher than low-stage; high-stage is the main monitoring point for thermal decomposition risk. Cascade unit high-stage reciprocating refrigeration compressor works under high compression ratio; even small suction pressure drop will push discharge temperature sharply upward.

FAQ

Q1: What is the maximum continuous allowable discharge temperature for reciprocating compressor? A1: Continuous discharge temperature shall not exceed 145℃, shutdown at 155℃. Q2: What sensor deviation threshold requires Xiteliduo PT100 discharge sensor calibration? A2: Temperature reading deviation greater than ±4K. Q3: What are common causes for small 4-cyl compressor high discharge temperature? A3: Improper suction superheat or fouled condenser. Q4: How does excessive compression ratio raise medium 4-cyl compressor discharge temperature? A4: Low suction pressure increases gas temperature rise during compression stroke. Q5: What damage will long-time high discharge temperature bring to large 4-cyl compressor? A5: Carbon deposit formation which sticks valve reed and reduces volumetric efficiency. Q6: What consequence will repeated high-temperature trip without troubleshooting cause? A6: Valve service life is reduced by 50%. Q7: Which stage has higher discharge temperature on single-unit two-stage compressor? A7: High-stage compressor runs at significantly higher discharge temperature.