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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 411C
ET 411C Compression Refrigeration System Show data sheet (pdf file) Print page
Technical Description

  The set-up of ET 411C represents a typical refrigeration circuit consisting of a hermetic compressor, condenser, evaporator and expansion element. Evaporator and condenser are designed as finned tube heat exchangers. The pipes of both heat exchangers are partially transparent to visualise the process of the phase transition during evaporation and condensing. Three capillary tubes of different lengths and a thermostatic expansion valve can be compared as expansion elements. 
  The trainer is equipped with a receiver for refrigerant. Using the receiver, refrigerant can be added to or removed from the refrigeration circuit. This allows for the effects of overfilling or underfilling of the system to be examined.
  The flow rate of the refrigerant is read from a flow meter. Temperature and pressure in the refrigeration circuit and the electrical power consumption of the compressor are recorded by sensors. The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included. Parameter changes in the refrigeration circuit can be viewed dynamically in the software's log p-h diagram.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- function and operational behaviour of the

  refrigeration circuit components
- operation with expansion valve or with capillary

  tubes of different lengths
- underfilling or overfilling with refrigerant
- thermodynamic cycle in the log p-h diagram
- calculate the refrigeration capacity from the log p-h

  diagram and in comparison with
  * the measured values
  * calculate the coefficient of performance
  * calculate the efficiency of the compressor


* Compression refrigeration system with transparent

  evaporator and transparent condenser1
* Compare different expansion elements1
* Effect of under/overfilling of the system with


Alternative products
ET 350 -- Changes of State in the Refrigeration Circuit
ET 352 -- Steam Jet Compressor in Refrigeration Engineering
ET 400 -- Refrigeration Circuit with Variable Load
[1] investigation of a refrigeration system with different expansion elements
[2] refrigeration circuit consisting of a hermetic compressor, condenser, evaporator and expansion element
[3] transparent finned tube heat exchangers as condenser and evaporator to observe the phase transitions of the refrigerant
[4] expansion valve and capillary tubes of different lengths as expansion elements
[5] receiver for underfilling/overfilling the system with refrigerant
[6] sensors record pressure and temperature
[7] compressor equipped with two pressure switches
[8] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista
[9] refrigerant R134a, CFC-free
Technical Data

- power consumption: 213W at 7,2/32C
- refrigeration capacity: 372W at 7,2/32C
Condenser and evaporator with fan
- max. air flow condenser: 300m/h
- max. air flow evaporator: 180m/h
Capillary tubes: 1,5m, 3m, 6m
Receiver for refrigerant: 1,3L

Measuring ranges
- pressure: -1...9bar / -1...24bar
- temperature: 4x -40...150C, 1x -100...100C
- flow rate: 2...18m/h
- electric power consumption: 0...1.000W


Dimensions and Weight

LxWxH: 1.730x790x1.760mm
Weight: approx. 150kg

Required for Operation
230V, 50Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 trainer

1 LabVIEW software CD + USB cable

1 set of instructional material

Order Details

061.411C0  ET 411C  Compression Refrigeration


© 2005 G.U.N.T. Gerätebau GmbH