CENTRO DE NOTICIAS

Cold Storage Air Cooler: Refrigerant Oil Return Obstacles and On-site Troubleshooting

  • Release time: 2026-10-13

Cold Storage Air Cooler: Refrigerant Oil Return Obstacles and On-site Troubleshooting

Stable oil return keeps lubricant flowing back to compressor. Poor oil return causes oil accumulation inside evaporator and oil shortage in compressor. Oil travels through refrigeration system mixed with refrigerant vapor. Low flow velocity in coil pipeline prevents oil droplets from moving back toward compressor. Xindacool evaporator internal pipeline layout adopts upward slope design, helping lubricant flow back with refrigerant gas during operation. Long horizontal refrigerant pipelines are the typical area for oil trapping. Oil settles at pipe bottom when gas flow speed is insufficient. Insufficient compressor running hours also worsens oil return. Frequent short cycles do not maintain enough gas velocity to carry oil back. When oil accumulates heavily inside evaporator, heat transfer performance drops. Power consumption rises continuously while cooling capacity reduces. Obstructed oil return can be identified through compressor oil level trend. Oil level keeps dropping even without obvious external leakage. Partial load operation reduces refrigerant flow speed. Cold storage running under low stock load needs careful evaluation of oil return performance. Pipe size selection directly impacts gas velocity. Over-large pipe diameter lowers flow speed and creates risk of oil trapping inside coil and piping. When troubleshooting oil return issues, check pipe slope first. Reverse slope will trap oil and stop lubricant returning to compressor. After system overhaul, monitor compressor oil level for 72 consecutive hours. This helps confirm oil return function returns to normal state.

FAQ

Q: What risk of poor oil return for refrigeration system? A: Lubricant accumulates in evaporator, compressor lacks oil supply and heat exchange efficiency declines. Q: What helps oil flow back inside evaporator coil? A: Pipeline layout with upward slope maintains enough gas velocity to carry oil droplets back. Q: Where is oil most likely to get trapped? A: Long horizontal refrigerant pipes when refrigerant gas flow velocity is too low. Q: How to judge oil return obstacle? A: Compressor oil level gradually decreases while no refrigerant leakage can be found. Q: Why frequent short running cycles hurt oil return? A: The system cannot sustain enough gas velocity to carry lubricant back to compressor. Q: How pipe diameter affects oil return? A: Over-large pipe reduces gas flow speed and increases oil trapping risk inside pipeline. Q: What to check first during oil return troubleshooting? A: Inspect pipeline slope to confirm no reverse slope trapping lubricating oil. Q: What monitoring after system overhaul? A: Track compressor oil level continuously for 72 hours to verify oil return recovery.

url: https://www.xindacool.com/news/826.html

Stable quality · Trustworthy

CONTACT US

Address: No. 866, Putian Avenue, Sanjiang Sub-district, Shengzhou City, Zhejiang Province 
Mobile phone: +86 13567599011
Landline: 0575-83268796 
Email:michelle@xindacool.com

Copyright © 2026 Shengzhou Xinda Refrigeration Equipment Factory All Rights Reserved.