State-of-the-art Engineering Equipment

RAC-106 | Absorption refrigeration Air Conditioning Unit

  • Operation of an absorption refrigeration system
  • Main system components: evaporator, absorber, generator with pump, condenser
  • Ammonia-water solution as working medium, hydrogen as auxiliary gas
  • Electrically operating generator to separate ammonia
  • Pump for transportation in the circuit
  • Boiler is heated by electrical heater
  • Digital displays for temperature and power
  • LxWxH: 750x450x750 mm
  • Weight: approx. 47 kg
Technical Specification
Refrigerating plants make use of the fact that a refrigerant evaporates at low pressure. In absorption refrigeration systems, the absorption of ammonia in the water produces this low pressure. The absorption process is driven by thermal energy, which can come for example from industrial waste heat or solar collectors to operate these systems. This basic principle of an absorption refrigeration system is demonstrated in the experimental unit taking the example of an ammonia-water solution with the ammonia acting as refrigerant. In the evaporator the liquid ammonia evaporates and withdraws heat from the environment. To keep the evaporation pressure low, the ammonia vapour in the absorber is absorbed by the water. In the next step, ammonia is permanently removed from the high concentration ammonia solution to prevent the absorption process from being halted. For this purpose, the high concentration ammonia solution is heated in a generator until the ammonia evaporates again. In the final step, the ammonia vapour is cooled in the condenser to the base level, condenses and is returned to the evaporator. The low concentration ammonia solution flows back to the absorber. To maintain the pressure differences in the system, hydrogen is used as an auxiliary gas. In process technology systems the resulting waste heat can be used for cooling. In small mobile systems, such as a camping refrigerator or minibar in a hotel, the required heat is generated electrically. Another benefit of absorption refrigeration systems is their silent operation. This Unit demonstrates the functional principle of an absorption refrigeration system with its main components: evaporator, absorber, generator with pump, condenser. The generator operated electrically.  Temperatures in the refrigeration circuit and the heating power at the generator and at the evaporator are recorded and displayed digitally.
  • Working medium: ammonia-water solution
  • Auxiliary gas: hydrogen
  • Electric heater: 100W
  • Evaporator heater, adjustable: Approx. 50W
Measuring ranges
  • temperature: 4x -80…180°C
  • power: 0…100W