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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 352
ET 352 Steam Jet Compressor in Refrigeration Engineering Show data sheet (pdf file) Print page
Technical Description

Unlike standard compression refrigeration systems, steam jet refrigerating machines do not have a mechanical but a steam jet compressor. This makes it possible to use different heat sources for cold production. Such sources could e.g. be solar energy or process waste heat.
  The system includes two refrigerant circuits: one circuit is used for cold production (refrigeration cycle), the other circuit is used for the generation of motive steam (steam cycle).
  The steam jet compressor compresses the refrigerant steam and transports it to the condenser. A transparent tank with a water-cooled pipe coil serves as condenser.
  In the refrigeration cycle some of the condensed refrigerant flows into the evaporator connected to the intake side of the steam jet compressor. The evaporator is a so-called flooded evaporator where a float valve keeps the filling level constant. The refrigerant absorbs the ambient heat or the heat from the heater and evaporates. The refrigerant steam is aspirated by the steam jet compressor and compressed again.
  In the steam cycle a pump transports the other part of the condensate into a steam generator. An electrically heated tank with water jacket evaporates the refrigerant. The generated refrigerant steam drives the steam jet compressor.
  All relevant measured values, such as temperature and pressures, are measured and displayed in the experimental unit. The heater power at the evaporator is adjustable. The cooling water flow rate at the

condenser is adjusted using a valve. 

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


Learning Objectives / Experiments

- Understanding compression refrigeration systems

  based on the steam jet method
- Clockwise and anticlockwise Rankine cycle
- Energy balances
- Calculation of the coefficient of performance of the

  refrigeration circuit
- Thermodynamic cycle in the log p-h diagram
- Operating behaviour under load

* Refrigeration system with steam jet compressor1
* Cold production using heat1
* Transparent condenser and evaporator
Alternative products
ET 350 -- Changes of State in the Refrigeration Circuit
ET 411C -- Compression Refrigeration System
[1] Investigation of a steam jet compressor
[2] Refrigeration circuit with condenser, evaporator and steam jet compressor for refrigerant
[3] Steam circuit with pump and steam generator for operating the steam jet compressor
[4] Transparent tank with water-cooled pipe coil as condenser
[5] Transparent tank with adjustable heater as evaporator
[6] Flooded evaporator with float valve as expansion element
[7] Steam generator with electrically heated water jacket
[8] Measurement of amperage and voltage to determine the power at the evaporator
[9] Refrigerant Solkatherm SES36, CFC-free 
Technical Data

Steam jet compressor
- dmin convergent-divergent nozzle:

  approx. 1.7mm
- dmin mixing jet: approx. 7mm
- tank: approx. 3.5L
- pipe coil area: approx. 0.17m
- tank: approx. 3.5L
- heater power: 4x 125W
Steam generator
- refrigerant tank: approx. 0.75L
- water jacket: approx. 9L
- heater power: 2kW
- max. flow rate: approx. 1.3L/min
- max. head: approx. 60mWS 
Measuring ranges
- current: 0...2.5A
- voltage: 0...230VAC
- temperature: 10x -20...200C
- pressure: 2x 0...10bar / 2x -1...1.5bar
- flow rate (cooling water): 6...75g/s


Dimensions and Weight
l x w x h: 1250 x 450 x 1200 mm
Weight: approx. 60 kg
Required for Operation
230V, 50/60Hz, 1 phase
Water connection
Scope of Delivery
1 experimental unit, 1 hose, 1 bottle refrigerant, 1 funnel, 1 set of instructional material
Order Details

061.35200  ET 352  Steam Jet Compressor in

                                Refrigeration Engineering

© 2005 G.U.N.T. Gerätebau GmbH