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ET 122

- Demonstration of the vortex principle
- Cooling and heating using compressed air


Technical Description

The experimental unit generates cold and hot air with the aid of ordinary compressed air. The central element of the experimental unit is a vortex cooling device also known as a vortex tube. In the vortex tube the tangentially incoming compressed air is moved in rapid rotation. This creates a cold and hot air flow in the vortex tube which leaves the vortex tube at opposite ends. 
A vortex cooling device does not have any moving parts, is maintenance-free and immediately ready for operation. 

The vortex cooling device is used for the convective cooling of high-speed tools, the air conditioning of protection suits and the cooling of switch cabinets. It is particularly suited for use in explosive environments. One benefit here is that the vortex cooling device does not require an electric power supply.

The inlet pressure is measured using a manometer. The compressed air volume and the outlet volume of the hot air flow are each measured using a rotameter. The inlet temperature of the compressed air and the outlet temperatures of the cold and hot air flows are displayed digitally. 

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- function and operation of a vortex cooling device
- air flow distribution dependent on the temperature of the cold air flow
- effect of the inlet pressure on heating and refrigeration capacity



[1] functional model for cold air generation using a vortex cooling device (vortex tube) with the aid of compressed air 
[2] experimental unit with clear design of all components at the front
[3] simple design, no moving components, wear-free
[4] measuring of the compressed air inlet pressure by manometer
[5] flow rate measurement of compressed air and exhaust hot air by rotameters
[6] digital displays for inlet temperature and outlet temperature of cold and hot air

Technical Data
Vortex cooling device
- inlet pressure: 5,5bar
- air consumption: max. 420L/min
- refrigeration capacity: max. 267W (230kcal/h)
- minimum temperature: -40°C
- maximum temperature: 110°C
Measuring ranges
- temperature: 3x -50...150°C 
- pressure: 0...10bar
- flow rate: 2...25m³/h

Dimensions and Weight
LxWxH: 1000x600x710mm
Weight: approx. 50kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Compressed air: min. 6bar, 25m³/h

Scope of Delivery

1 experimental unit
1 set of accessories
1 set of instructional material

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