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ET 915.01 Refrigerator Model
Education / GUNT Hamburg / Thermal Engineering and HVAC / Refrigeration and Air Conditioning Technology /

ET 915.01 is part of the HSI training system for refrigeration and air conditioning technology. In combination with the base unit ET 915 the operational model of a domestic refrigerator is created. The model is plugged onto the base unit, secured using fasteners and connected with refrigerant hoses to become a complete refrigeration circuit. 
  ET 915.01 consists of a refrigeration chamber with a heater as cooling load, evaporator, fan and various expansion elements. The fan supports the achievement of an even temperature distribution in the chamber. A cooling load can additionally be simulated with the heater. Solenoid valves enable the operation of the system with capillary tube or with expansion valve. All components are clearly arranged on a panel.
  The control of individual system components, here the temperature control, fan, heater, compressor and solenoid valves, takes place via the educational software included in the scope of delivery of the base unit ET 915. The software offers the option to simulate faults.
  Temperatures and pressures in the system are recorded by sensors and displayed dynamically in the educational software. The effect of parameter changes can be tracked online in the log p-h diagram.

Learning Objectives / Experiments

- Understand and get familiar with the design and

  operation of a simple refrigeration system
- Familiarisation with the principle of operation of an

- Different expansion elements 
  * operation with capillary tube
  * operation with expansion valve
- Operating behaviour under load
- Refrigeration cycle in the log p-h diagram
- Fault simulation

[1] Model of a refrigerator to plug onto the base unit ET 915
[2] GUNT training system with HSI technology
[3] Refrigeration chamber with evaporator, fan and cooling load
[4] Chamber with transparent front 
[5] Electric heater to generate the cooling load
[6] Expansion elements selectable via solenoid valves: expansion valve or capillary tube
[7] Sensors to record temperature and pressure
[8] Solenoid valves, fan, heater and fault simulation controlled via the software
Technical Data

Refrigeration chamber: l x w x h: 270x270x220mm 
Electric PTC heater as cooling load: 210W
Capillary tube: length 2m


Measuring ranges
- temperature: 3x -50...50°C
- pressure: -1...9bar

Dimensions and Weight
l x w x h: 850 x 380 x 550 mm
Weight: approx. 30 kg
Scope of Delivery
1 refrigerator model, filled with refrigerant
Order Details

061.91501  ET 915.01  Refrigerator Model