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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 431
ET 431 Heat Exchangers in the Refrigeration Circuit Show data sheet (pdf file) Print page
Technical Description

  Heat exchangers are an elementary part of refrigeration systems. During cooling they are used to absorb the energy of the refrigerant by evaporation. During heating they discharge the energy set free during the condensation of the refrigerant. They are also used for internal energy transfer during superheating or supercooling of the refrigerant.
  Dependent on the media, a difference is made between air/refrigerant, water/refrigerant and refrigerant/refrigerant heat exchangers. Dependent on the constructive design, a difference is also made between coaxial, finned tube, plate or shell & tube heat exchangers.
  The refrigeration circuit of the trainer includes as evaporator an air cooling finned tube heat exchanger and a water-heated plate heat exchanger, as superheater a tubular heat exchanger, and as condenser a water-cooled coaxial coil heat exchanger. These heat exchangers are the ones used most commonly in refrigeration and fulfil different functions dependent on the system type. A finned tube heat exchanger can e.g. also be used as a condenser. By measuring the mass flows and the inlet and outlet temperatures the transferred energy flows can be determined. The components are arranged clearly at the front.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Different heat exchangers and their use in

  * coaxial coil heat exchanger
  * finned tube heat exchanger
  * tubular heat exchanger
  * plate heat exchanger
- Find out the correct installation position
- Determine energy flows
- Effect of superheating and supercooling of the
  refrigerant on the cyclic process
- Design of a compression refrigeration system
- Representation of the cyclic process in the

  log p-h diagram


* Typical heat exchangers from refrigeration1
* Different media: air/refrigerant,

  refrigerant/refrigerant and water/refrigerant1
* Effect of superheating and supercooling of the

  refrigerant on the cyclic process

[1] Refrigeration system with 4 different heat exchangers: coaxial coil heat exchanger, finned tube heat exchanger, tubular heat exchanger, plate heat exchanger
[2] Combinations of different media: water/refrigerant, refrigerant/refrigerant, air/refrigerant
[3] Water circuit with tank and pump to cool the condenser and heat the evaporator
[4] Superheater can be disabled via bypass
[5] Flow meter and thermometer in the water circuit to determine the exchanged heat flows
[6] Thermometers at all relevant points of the system
[7] Refrigerant R134a, CFC-free
Technical Data

- refrigeration capacity: 580W at -5/32C
- power consumption: 235W at -10/32C
Receiver: 1.4L


Measuring ranges
- pressure: -1...9bar / -1...24bar
- temperature: 3x -20...30C, 9x 0...60C,

  1x 0...100C
- flow rate: 2x 240L/h

Dimensions and Weight
l x w x h: 1800x750x1900mm
Weight: approx. 200kg
Required for Operation
230V, 50Hz, 1 phase
Scope of Delivery
1 trainer
1 set of instructional material
Order Details

061.43100  ET 431  Heat Exchangers in the

                                 Refrigeration Circuit

© 2005 G.U.N.T. Gerätebau GmbH