The Test center PWLP supports the industry in the development of environmentally friendly, energy-efficient vapor-compression refrigeration system and compression heat pumps. In practice, the F-Gas Regulation EU 517/2014 means the increased use of flammable refrigerants (KM) of classes A2 and A3. The ILK Dresden offers the following services for you:

Investigation of compressor parameters

For a defined application map of open, semi-hermetic or hermetic respectively one or two stage refrigerant compressors we determine the refrigerating capacity, power absorbed, COP, volumetric and isentropic efficiency. For a defined application map, we determine according to the standards
DIN EN 13771-1 and DIN EN 12900 the Cooling capacity, drive power, COP, delivery and quality level Now also for flammable refrigerants like propane! We determine the parameters for

• one- or two-stage (with integrated ECONOMISER),
• semi-hermetic or
• hermetic compressors
• types: reciprocating or rolling piston, scroll compressors

The ASEREP property library from ASERCOM is the source of the refrigerant property values Current calibrations of the measuring systems are a matter of course.
Within the scope of our flexible accreditation, further measuring tasks can be realized according to applicable test standards.

Compressor service life study

We test the thermal / mechanical long-term behavior and the interaction between compressor, refrigerant (A1, A2 / L and A3) and oil in the LifeTimeTest LTT500

• according to the individual requirement of the customer or
• according to our ILK standard procedure over approx. 500 h:
  
  • with defined variable loads in the compressors operating map (stress level 1… 6)
  • when the permissible operating parameters are exceeded (on / off cycles, reduced overheating, oscillation, liquid) and with analysis of the development over time of the compressor parameters at the reference point (according to DIN EN 13771-1).

Examination of the compressor and oil condition

We check in a condition analysis of the compressor

• possible damage from field use or after completing a LifeTimeTest LTT500
• based on macroscopic mechanical wear characteristics, electrical properties of the electric motor and oil condition
• optionally with technical evaluation of the compressor according to Guideline VDI 2225 (objectification of characteristics without directly measurable comparison parameters).

ILK Dresden has been active for many years in the field of developing and testing refrigeration and heat pump technology. Development work is carried out on a case-by-case basis and in close collaboration with the client. ILK Dresden possesses extensive expertise in the investigation of refrigerant compressors. The expertise required for evaluating these machines was developed in particular through the following funded projects:

• “Energy Efficiency of Refrigerant Compressors,” (BMWi EN FKZ IW073034),
• “Multiple Intermediate Injection in Rotary Piston Compressors,” (BMWi EN FKZ VF120022),
• “Test Bench and Test Procedures for Condensing Units” (BMWi EN FKZ MF150072)
• “Methods for Compressor Protection,” (BMWi EN FKZ MF150165).

These projects yielded insights, in particular, on the following topics, which enable a professional interpretation of the results:

• Design structure of different compressor designs
• Trends in coefficient of performance (COP) and coefficient of delivery (COD) as a function of compressor type and performance map
• Performance measurement methods with reduced measurement uncertainty for compressors of different designs
• Development of cooling capacity, drive power, and COP as a function of design and operating conditions
• Relationships between external and internal conditions of the compression process and their effects on the definition of comparative performance metrics
• Methods for determining the oil content in the refrigerant mass flow