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ET 915

- Base unit for the setup of basic experiments in refrigeration and air conditioning technology
- Modern learning environment through hardware/ software integration (HSI)
- Four models on refrigeration and air conditioning technology


Technical Description

The base unit ET 915 is, dependent on the objective of the experiment, extended into complete refrigeration circuit with one of the models available as accessories (ET 915.01 refrigerator, ET 915.02 refrigeration system with refrigeration and freezing stage, ET 915.06 simple air conditioning system, ET 915.07 air conditioning).

The main components of ET 915 are compressor, condenser and receiver plus electrical and communications systems. The models are plugged onto the base unit and connected hydraulically with refrigerant hoses and electrically with cables. Self-sealing couplings reduce the refrigerant loss to a minimum. All components are arranged well visible to allow their operation to be monitored.

The modern and powerful software is an integral part of the training system in the form of hardware/software integration (HSI). It enables the comfortable execution and analysis of the experiments. The experimental unit is connected to the PC via a USB interface.

The GUNT software consists of a software for system operation and for data acquisition and an educational software. With explanatory texts and illustrations the educational software significantly aids the understanding of the theoretical principles. With the aid of an authoring system, the teacher can create further exercises. Each model has its own GUNT software matching the learning objectives.

Temperatures and pressures in the system are recorded by sensors and displayed dynamically in the software for system operation and data acquisition. The effect of parameter changes can be tracked in log p-h and h-x diagrams. The system is also operated via the software.

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

Learning Objectives / Experiments

In conjunction with ET 915.01, ET 915.02, ET 915.06 and ET 915.07
- fundamentals of the refrigeration cycle
- fundamentals of air conditioning
- components in a refrigeration system/air conditioning system
- system operation
- fault finding



[1] basic experiments on the operation of refrigeration and air conditioning systems by combining the base unit and models
[2] GUNT training system with HSI technology
[3] condensing unit consisting of compressor, condenser and receiver
[4] connection between condensing unit and model via refrigerant hoses
[5] model attached securely on ET 915 with fasteners
[6] manometer for refrigerant with temperature scale 
[7] refrigerant R134a, CFC-free
[8] system control via solenoid valves and software
[9] functions of the GUNT software: educational software, data acquisition, system operation 

Technical Data
Condensing unit
- refrigeration capacity: 340W at 0/32°C
Measuring ranges
- temperature: 1x -50...50°C, 3x 0...100°C
- pressure
  1x intake side: -1...9bar
  2x delivery side: -1...15bar

Dimensions and Weight
LxWxH: 830x650x320mm
Weight: approx. 60kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 condensing unit, filled with refrigerant
1 CD with authoring system for GUNT educational software 
1 set of instructional material

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