Semi-hermetic Single-stage Screw Compressor

SRS semi-hermetic single-stage Screw Compressors include 5 series totaling 14 models with a displacement of 84 – 500 m3/h @ 2960 rpm. A large application window caters for a wide range of applications. Whereas all major refrigerants can be used, our compressors are optimized for the natural and environment-friendly refrigerants such as Ammonia R717.

The semi-hermetic construction results in a permanent technical leak-proof solution without a shaft seal.

The use of frequency inverters, a permanent magnet synchronous motor and adjustable Vi ensure high efficient operation at varying load and temperature profiles, thus guaranteeing high SEER values.

Applications where this product is suitable











Features of SRM open-type single-stage screw compressor:

  • “I”type patented profile, best lobe ratio of 5+7, high efficiency.
  • The aluminium windings of the PM motor are compatible with ammonia and need no extra protection which can get damaged or deteriorate over time.
  • Rotor is made of high- quality forged steel with micron- machining accuracy, high strength, high wear resistance, and long durability.
  • The housing is made of high- strength ductile iron, design pressure: 2.8 Mpa.
  • High- precision and wear- resistant roller bearings designed for a life span of 80.000 operating hours.
  • The internal compression ratio Vi can be adjusted to the existing operating conditions either manually or automatically for highest efficiency, even under varying conditions.
  • Integrated oil channels for secure lubrication of all critical spots within the compressor.
  • Suction and discharge ports can be swapped from left to right and turned 360° for easy mounting and connection in multiple compressor systems.

Ice Rink cooling by SRS duopack

The first semi-hermetic Ammonia compressor package in Europe was successfully commissioned in the ice-hockey stadium in Braunlage, Germany.

Replacing four vintage piston compressors which were causing increasingly
high maintenance and service cost by a semi-hermetic compressor package
the plant room now shines again with state of the art equipment.

Being PLC-controlled the inverter-driven compressors with their permanent magnet motors
can utilize their superior capabilities to reduce the energy bill dramatically by
floating the condensing and evaporating temperature at reduced delta-T to adjust
perfectly to the demand of the application and the ambient.

Technical data:
Cooling capacity Qo: 575 kW
Evaporation To: -10° C
Condensing Tc: +33° C
Commissioning: 07 /2017