G.U.N.T. - Equipment for engineering education -

Home

Products

Company

Theory of Machines and Properties of Materials

Mechatronics

Thermodynamics, Heating and Sanitary Systems

>	Fundamentals of Thermodynamics
>	Applied Thermodynamics
>	Power Engines and Machines
>	Internal Combustion Engines
>	Refrigeration and Air Conditioning
>	Heating and Ventilation
>	Sanitary Systems

Fluid Mechanics and Hydrology

Process Control and Process Engineering

Overviews

Products | Thermodynamics, Heating and Sanitary Systems | Refrigeration and Air Conditioning | ET 460

ET 460

Oil Return in Refrigeration Systems

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)

Features

Dissolved lubricants in refrigerants
Capacity controlled refrigeration system with TWIN-compressor
Clear experimental set-up on mobile test stand
Transparent intake pipes

Specification

[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

Connections

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