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ET 460: Oil Return in Refrigeration Systems

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Oil Return in Refrigeration Systems

Oil Return in Refrigeration Systems

Product Details

Technical Description
The unit addresses the problem of oil return in refrigerant circuits. In refrigerant circuits the lubricant is carried through the pipe system by the refrigerant. Oil may impact the compressor if the system is overfilled. If the system is underfilled the compressor may run dry. The selection of the correct diameter and arrangement of pipework is therefore of key importance. The effect of the refrigerant flow rate on the oil return to the compressor is demonstrated on this unit with the aid of glass intake pipes. A complete refrigerant circuit is mounted on the rear of the demonstration panel. To demonstrate the effect of different pipe diameters and routing, individual sections can be selected using ball valves. Pressures and flow rates are measured in the refrigerant circuit. The laboratory trolley mounted system is flexible and suitable for use in different seminar or training rooms.

Learning Objectives / Experiments
· Lubricating oil transport in refrigeration circuits
· Effect of the flow rate
· Effect of pipe cross-sections (e.g. oversized intake pipe (no oil return))
· Different pipe arrangements (e.g. Functioning of a double riser at varying flow rates of the compressor)

Dissolved lubricants in refrigerants
Capacity controlled refrigeration system with TWIN-compressor
Clear experimental set-up on mobile test stand
Transparent intake pipes
[1] unit on dissolved lubricants in refrigerants
[2] l x w x h 1100x650x1950mm, 100kg
[3] Capacity controlled refrigeration system mounted on the back of the unit
[4] Air-cooled condensing unit with speed-controlled TWIN-compressor for varying flow rates
[5] Transparent intake pipes with different diameter, can be selected using ball valves
[6] Double riser made of glass included
[7] Refrigerant R134a, CFC-free
[8] 230V, 50Hz, 1 phase

Technical Data
Air-cooled condensing unit: power consumption: 810W, refrigerating capacity: 1105W at -10/32°C, airflow rate: 1300m³/h, collector: 1.4ltr
Evaporator: air cooler, capacity: Approx. 1.1kW, cooling surface area: 7m², airflow rate: 545m³/h
Intake pipes made of glass, length 1500mm:
Ø18x1.8mm / Ø13x1.5mm / Ø9x1.5mm
Measuring ranges:
- pressure: -1…9bar / -1…24bar
- flow rate: 8…102ltr/h

Dimensions and Weight
l x w x h : 1100 x 650 x 1950 mm
Weight : approx. 100 kg

230V, 50Hz, 1 phase

Scope of Delivery
1 fully assembled system, 1 set of tools, 1 instruction manual

Order Details
061.46000 ET 460 Oil Return in Refrigeration Systems

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
E-Mail:   |  Internet:

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