Compressor Cylinder Head Cooling with LPA®

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Compressor Cylinder Head Cooling with LPA®

Compressor cylinder head cooling  by 120F (60°C) makes an attractive heat sink for screw or piston compressors

 A small amount of liquid refrigerant is injected into the HP port of the compressor that provides de-superheating of discharge vapors sufficiently enough to cool the entire compressor . Reciprocating or screw compressors have provisions for Liquid Injection which can be thermostatically controlled to prevent cylinder temperatures falling too far, 120F / 60°C or more .  As a result compressor shell and oil temperatures are substantially reduced . Oil coolers and economizers can be removed from the refrigeration system further improving efficiency .  Screw or piston Nh3 compressor cylinder head cooling with liquid refrigerant enables the Nh3 refrigeration circuit to operate with lower evaporating temperatures in hotter geographical regions than with water cooled cylinder heads.


The cylinder heads act as heat sinks absorbing heat of compression and other losses improving the overall performance of the compressor. Liquid injection eliminates the need for oil cooling and or the higher additional energy consumption of economizers, equipment that can be removed. All of which can be provided by a fractional hp LPA® pump motor at a fraction of the cost.


  • Elimination of scale build-up, evaporative cooling towers and water cooled condensers due to the hot gas temperature entering the condenser is below the temperature that scale forms, the formation of scale build-up is eliminated, maintaining peak efficiency.


  • Compressor head cylinder cooling. Liquid Injection into the HP port side of the compressor cylinder heads greatly reduces the discharge temperature and provides cooler compression. Cooler compressors last longer and are free of oil carbonation issues.


  • De superheating evaporative cooling towers to reduce drift loss or eliminate water evaporation. Most often these losses contain chemicals which are harmful to the environment.


  • De superheating Co2 cascade condensers to improve condensation and lower liquid temperatures for higher efficiency.


  • De superheating transcritical 1st and 2nd stage discharge or suction temperatures to reduce Isentropic discharge temperature to improve the overall system’s energy efficiency rating.

de superheating

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