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.

- 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