This apparatus is designed to demonstrate the principles of the vapor absorption refrigeration cycle, using an ammonia-water solution to produce a cooling effect through external thermal energy source. It allows students to observe the complete cycle, from the separation of ammonia vapor in the generator to the absorption process, and to compare the performance when using different heat sources.
The unit features a generator that can be heated by either an adjustable electrical heater or an LPG gas burner to boil the ammonia-water solution. A bubble pump circulates the fluid, and an electrical heater attached to the evaporator simulates a variable cooling load. Digital displays show key parameters such as temperatures at critical points and electrical power input, enabling quantitative analysis of the system performance under different operating conditions.
Its primary application is in mechanical and energy engineering education for teaching alternative refrigeration technologies. The key benefit is a clear and operational demonstration of a heat-driven refrigeration cycle, enabling students to calculate the coefficient of performance (CoP) and understand the practical application of absorption systems in solar cooling and waste heat recovery.
Specification
• Ammonia-water solution as working medium.
• Gas/electric boiler to separate ammonia.
• Bubble pump to move the working fluid.
• Adjustable electrical heater at the evaporator to serve as cooling load.
• Boiler heating by electrical heater or gas burner.
• Digital displays for temperature and power.
Technical data
• Working fluid: Ammonia-Water solution
• Electric heater:
• Power: 120W
• Gas burner: LPG Operated
• Evaporator heater:
• Power: 50W
Measuring range:
• Temperature: -30 to 150oC
• Power: 0 to 150W
Operational AC power supply:
• 230V, 50Hz, 1 phase
Dimensions and weight
LxWxH:750 mm (L) x 450 mm (W) x 750 mm (H) approx.
Weight:40kg approx.