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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 915.02
ET 915.02 Model of a Refrigeration System with Refrigeration and Freezing Stage Show data sheet (pdf file) Print page
Technical Description

ET 915.02 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 refrigeration system with refrigeration and freezing stage results. The model is plugged onto the base unit, secured using fasteners and connected with refrigerant hoses to become a complete refrigeration circuit.
  In refrigeration and freezing combinations evaporators are preferably connected in parallel. To increase the refrigeration capacity, evaporators are operated connected in series. Here different pressure levels in the evaporators can be used to obtain different temperature ranges for refrigeration or freezing.
  ET 915.02 includes two separate refrigeration chambers with evaporator and expansion elements. The evaporators can be optionally operated connected in series or in parallel. Two fans in the refrigeration chambers support the achievement of an even temperature distribution. With heaters cooling loads can additionally be simulated. One of the refrigeration chambers can optionally be operated with an expansion valve or a capillary tube as expansion element. The various operation modes are set via solenoid valves. An evaporation pressure controller permits in parallel operation the independent adjustment of the temperature level in the upper chamber. All components are clearly arranged on a panel.
  The control of individual system components, here temperature control, fan, heater, compressor and solenoid valves, takes place via the educational software included in the scope 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

- Design and operation of a refrigeration system with

  two evaporators
- Series and parallel connection of two evaporators
- Familiarisation with the different expansion

  * operation with capillary tube
  * operation with expansion valve
- Operating behaviour under load
- Refrigeration cycle in the log p-h diagram
- Effect of the evaporation pressure
- Fault simulation

* Series and parallel connection of evaporators1
* Control of components and fault simulation

[1] Model of a refrigeration system to plug onto the base unit ET 915
[2] GUNT training system with HSI technology
[3] Each refrigeration chamber includes: evaporator with fan (to recirculate the air) and heater to generate the cooling load
[4] Refrigeration chambers with transparent front
[5] Adjustable evaporation pressure controller
[6] Selectable expansion elements: expansion valve or capillary tube
[7] Operating modes of the system configurable via 5 solenoid valves
[8] Sensors to record temperature and pressure
[9] 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
Evaporation pressure controller: 0...5.5bar


Measuring ranges
- temperature: 6x -50...50C
- pressure: 2x -1...9bar

Dimensions and Weight
l x w x h: 850 x 380 x 750 mm
Weight: approx. 45 kg
Scope of Delivery
1 refrigeration system model, filled with refrigerant
Order Details

061.91502  ET 915.02  Model of a Refrigeration

                                     System with Refrigeration

                                     and Freezing Stage 

© 2005 G.U.N.T. Gerätebau GmbH