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Cold Storage Air Cooler: Refrigerant Charge Volume and On-site Filling Operation Specifications

  • Release time: 2026-10-13

Cold Storage Air Cooler: Refrigerant Charge Volume and On-site Filling Operation Specifications

Improper refrigerant filling is a common reason for poor cooling performance. Overcharge or undercharge both reduce evaporator heat exchange efficiency greatly. The amount of refrigerant required depends on coil internal volume, pipe length and system operating temperature. No universal filling value applies to all cold storage projects. Xindacool evaporator datasheet provides coil internal volume reference, helping refrigeration engineers calculate initial refrigerant filling quantity. Undercharged system results in insufficient liquid supply to evaporator. Superheat becomes excessively high and cooling capacity cannot reach design value. Overcharged refrigerant occupies part of heat exchange surface. Liquid level rises inside evaporator and increases risk of liquid flood back to compressor. Refrigerant filling should be completed in stages. Small incremental filling and waiting for system stabilization avoid overfilling in one single operation. Temperature and pressure readings must be recorded during charging. Combine suction pressure, discharge pressure and superheat value to judge filling status. Moisture inside the system will form ice block at expansion valve. Vacuum pumping and dehydration must finish before refrigerant injection. Different refrigerants cannot be mixed. Mixing different refrigerants changes thermodynamic property and may damage compressor and heat exchanger. After filling completes, all pipe joints need leak detection. Electronic leak detector is used to find tiny leakage points invisible to naked eyes. In low temperature cold storage, refrigerant pressure is low. Filling judgment cannot rely merely on pressure gauge readings; superheat is the key indicator. If oil separator returns abnormal oil volume after filling, check refrigerant charge level. Too much refrigerant may carry excess lubricant into evaporator coil.

FAQ

Q: What problem arises with insufficient refrigerant charge? A: Liquid supply to evaporator is inadequate, superheat rises and cooling capacity fails to reach design standard. Q: What risk of overcharging refrigerant? A: Liquid refrigerant occupies heat exchange area and raises liquid flood back risk to compressor. Q: How to fill refrigerant properly? A: Fill in small batches, wait for system stabilization, and judge charge status combining pressure and superheat data. Q: What preparation before refrigerant filling? A: Complete vacuum pumping and dehydration to remove residual moisture inside refrigeration piping system. Q: Can different refrigerants mix in one system? A: No. Mixed refrigerants change thermal property and easily damage compressor and evaporator. Q: How to check leakage after refrigerant charging? A: Use electronic leak detector to inspect all pipe welding joints and connection ports. Q: Why pressure gauge alone cannot judge charge volume in freezer? A: Low temperature leads to low static pressure; superheat measurement is essential for accurate judgement. Q: Abnormal oil return after filling, what to check? A: Verify refrigerant charge amount, excess refrigerant may carry lubricating oil into evaporator coil.

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