Aftercooler For Screw Compressor And Reciprocating Compressor | VRCOOLER

Air Compressor Aftercooler for Screw Compressor & Reciprocating Compressor

Screw (rotary screw) and reciprocating (piston) compressors are both positive‑displacement machines, yet their working mode, discharge temperature and airflow characteristics are totally different. Their aftercoolers cannot be directly interchanged. Mismatched coolers will cause insufficient cooling, premature fatigue failure and high pressure drop.

 

Core Comparison Table

Item	Aftercooler for Screw Compressor	Aftercooler for Reciprocating(Piston) Compressor
Operation feature	Continuous steady airflow, non‑pulsating	Pulsating cyclic airflow, pressure shock from piston strokes
Typical discharge temp	Oil‑injected screw: 85‑110 ℃Oil‑free screw: up to 175 ℃	Two‑stage reciprocating: 130‑160 ℃, sharp temperature spikes
Common cooler construction	Combined oil‑cooler + aftercooler module; tube‑fin / plate‑fin(bar‑plate) core	Independent aftercooler; shell‑and‑tube or heavy‑duty tube‑fin; requires anti‑pulsation design
Cooling type preference	Air‑cooled is standard; water‑cooled for large‑capacity units	Water‑cooled widely used for multi‑stage high‑pressure models; air‑cooled for small‑size add‑on type
Intercooler demand	Multi‑stage oil‑free screw needs intercooler	Two‑stage piston compressor must use intercooler between stages to cut compression power
Mounting style	Factory‑integrated inside compressor package	Built‑in or external standalone aftercooler for retrofit
Key design focus	Steady‑state heat dissipation; compact layout; match constant CFM	Anti‑fatigue against pulse flow; resist thermal cycling shock; robust tube joint strength

 

Aftercooler for Rotary Screw Compressor

Most industrial oil‑injected screw compressors adopt an integrated dual‑circuit cooler: one side cools hot lubricant oil, the other side cools compressed air (aftercooler) inside one core assembly.

Main structure: tube‑fin (copper tube‑aluminum fin) or brazed aluminum plate‑fin cooler.

Working condition: stable mass flow, continuous 24‑hour running for factory production lines.

Failure mode: fin fouling, internal scaling, oil contamination inside channels.

Scope: 15 kW‑355 kW screw compressors, replacement for CompAir, Atlas Copco, Ingersoll‑Rand, Sullair etc.

Note: Oil‑free screw compressors run at much higher discharge temperature, so material and pressure rating must be upgraded accordingly.

 

Aftercooler & Intercooler for Reciprocating(Piston) Compressor

Reciprocating compressors deliver pulsating air flow. Re‑using screw‑type aftercooler will bring tube joint crack risk from repeated pressure shock.

Two‑stage piston units require intercooler between 1st‑stage and 2nd‑stage cylinder, plus final‑stage aftercooler after compression. Intercooler improves compression efficiency and lowers second‑stage temperature rise.

Water‑cooled shell‑and‑tube coolers are popular for heavy‑duty multi‑stage piston compressors; air‑cooled tube‑fin aftercoolers are widely used as add‑on parts for small‑and‑medium piston machines.

Common failure: tube‑to‑header leakage caused by pulse vibration, gasket fatigue.

Typical scenarios: mining, high‑pressure process air, workshop intermittent‑duty piston stations.

 

Critical Selection & Replacement Tips

Never swap screw‑compressor aftercooler directly onto reciprocating compressor without anti‑pulsation verification, vibration will cause early leakage.

Confirm key parameters before ordering: compressor type, power / CFM, working pressure, max discharge temperature, air‑cooled or water‑cooled.

For 2‑stage reciprocating units: intercooler and aftercooler are two separate heat exchangers, both need dimension data for 1:1 replacement.

Material options: standard copper‑aluminum; upgrade to stainless‑steel / Cu‑Ni for coastal, corrosive, high‑humidity sites.

Accessory suggestion: match complete condensate drain assembly when replacing cooler core to avoid water carry‑over issue.

 

VRCOOLER Supply Capacity

VRCOOLER supplies aftermarket aftercooler & intercooler for both screw and reciprocating air compressors:

Screw compressor: combined oil‑aftercooler, separate aftercooler core, tube‑fin / plate‑fin construction.

Reciprocating compressor: intercooler + final‑stage aftercooler with anti‑pulsation design, tube‑fin and shell‑and‑tube options.

Support 1:1 replacement according to old‑part sample, photos or technical drawings; pressure‑tested before shipment; 12‑month warranty.

Contact info@vrcooler.com, send your compressor information for quotation.