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ET 450

- Typical vehicle air conditioning system for cooling the vehicle interior
- Use of components from automotive technology
- Simulation of 8 system faults


Technical Description

Vehicle air conditioning systems are used to cool down the vehicle interior. They usually work on the basis of the recirculating air principle and aspirate the air to be cooled from the interior. The cold air generated in the air conditioning system is transported by a fan into the vehicle interior.

The refrigeration circuit to generate the cold air in the trainer ET 450 includes a compressor, a condenser with fan and an evaporator as air cooler with three-stage fan and expansion valve. All system components are typical elements used in vehicle technology. The air cooler with three-stage fan is e.g. equipped with typical air vents for the vehicle interior. This achieves a close proximity to practice. 

The trainer operates with the 12VDC supply common in vehicles. Even the ignition lock function has been implemented to switch on the system. An electric motor drives the compressor via a V-belt and a magnetic coupling. The speed of the motor and thus the compressor is variably adjustable by a frequency converter to simulate the drive via the vehicle engine.  

Important characteristic variables, such as pressure, temperature, flow rate and the power consumption of the compressor are displayed. As a particularity 8 connectable faults have been installed. The system is particularly suited for the training of motor mechanics. 

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

Learning Objectives / Experiments

- principle of operation, design and handling of a vehicle air conditioning system
- detection of typical faults and repair of a faulty air conditioning system
  * simulation of 8 system faults
- typical components of a refrigeration system
- refrigeration circuit as thermodynamic cycle
  * log p-h diagram
  * determine the coefficient of performance of the system
  * determine the compressor pressure ratio



[1] investigation of a typical vehicle air conditioning system for cooling the vehicle interior 
[2] compression refrigeration system with compressor, condenser, filter/drier, expansion valve and evaporator
[3] electric motor with variable speed as compressor drive
[4] condenser with fan 
[5] evaporator as air cooler with three-stage fan
[6] compressor drive via V-belt and magnetic coupling
[7] simulation of 8 faults via buttons in the connectable box
[8] system is switched on via ignition lock
[9] display of temperatures, pressures (refrigerant), flow rate (refrigerant), pick-up current, speed
[10] refrigerant R134a, CFC-free
[11] air conditioning system voltage supply: 12VDC

Technical Data

Electric motor
- rotary current motor
- variable speed via frequency converter 500...3000min-1
- power: 4kW at 3000min-1 
Axial piston compressor
- refrigeration capacity: approx. 3kW at 3000min-1
Condenser: capacity: 6,6kW
Evaporator: capacity: 5,3kW

Measuring ranges
- temperature: 4x -100...100°C
- flow rate (R134a): 10...95L/h
- pressure: -1...9bar / -1...24bar
- speed: 0...3.000min-1
- current: 0...10A

Dimensions and Weight
LxWxH: 1210x800x1520mm
Weight: approx. 185kg Required for Operation 400V, 50/60Hz, 3 phases or 230V, 60Hz, 3 phases

Scope of Delivery

1 trainer, filled with refrigerant
1 set of instructional material

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