Determination of Oil Circulation Ratio in Cooling Systems
Relevant for air-conditioning manufacturer, compressor manufacturer, research institutes, test bench engineering
OCR Measurement in Cooling Processes
The focus of OCR measurements is the optimization of cooling systems to increase the efficiency of the cooling process and to decrease operating costs. A main factor in terms of efficiency is the Oil Circulation Ratio (OCR). The oil in the refrigerant is essential for the lubrication of the compressor but negatively affects the thermodynamic properties of the refrigerant. Therefore the determination of the ideal mixing ratio is extremely important for maximum effectiveness with minimum wear rates of the compressor.
Anton Paar offers a wide range of customer specific solutions to develop, control and ensure the correct OCR in real time. Solutions for all established and new refrigerants are provided.
Process Sound Velocity Sensor L-Sonic 6100
For common refrigerants (chlorofluorocarbons = e.g. R134a, R1234yf, R410a, R32) a sound velocity measurement is used to determine the OCR. The sound velocity is specific to every medium and concentration.
Process Density Sensor L-Dens 7400
Experience has shown that sound velocity does not provide reliable results for OCR measurement with CO2.
For successful OCR measurements with CO2, Anton Paar develops applications with a high-pressure density sensor that can withstand up to 180 bar.
- Real time information on oil concentration
- Optimized measurement principles for increased test efficiency
- Avoids human and sampling errors
- Customer specific solutions
- Application development for CO2 measurements
Configuration for CFCs
L-Sonic 6100 version LS
Pico 3000 version AO or mPDS 5
Configuration for R744
Typical working conditions CFCs
Temp. range: 20 to 65 °C
Pressure range: 0 to 30 bar
Oil concentration range: 0 to 7 %
Typical working conditions R744
Temp. range: 0 to 44 °C
Pressure range: 60 to 130 bar
Oil concentration range: 0 to 10 %
Other relevant instruments
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