Unlike standard compression refrigeration systems, vapour jet refrigeration machines do not have a mechanical but a vapour 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 vapour (vapour cycle).
The vapour jet compressor compresses the refrigerant vapour and transports it to the condenser. A transparent tank with a water-cooled pipe coil serves as condenser.
Learning Objectives/Experiments
Understanding compression refrigeration systems based on the vapour 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
Solar thermal vapour jet refrigeration
Specification
Investigation of a vapour jet compressor
Refrigeration circuit with condenser, evaporator and vapour jet compressor for refrigerant
Vapour circuit with pump and vapour generator for operating the vapour jet compressor
Transparent tank with water-cooled pipe coil as condenser
Transparent tank with adjustable heater as evaporator
Flooded evaporator with float valve as expansion element
Capour generator with heated water jacket (electrically or solar thermally)
Refrigerant Solkatherm, GWP: 1
Technical Data
Vapour jet compressor
dmin convergent-divergent nozzle: approx. 1,7mm
dmin mixing jet: approx. 7mm
Condenser
tank: approx. 3,5L
pipe coil area: approx. 0,17m2
Evaporator
tank: approx. 3,5L
heater power: 4x 125W
Vapour generator
refrigerant tank: approx. 0,75L
water jacket: approx. 9L
heater power: 2kW
Pump
max. flow rate: approx. 1,7L/min
max. head: approx. 70mWS
Refrigerant
R1233zd
GWP: 1
filling volume: 5kg
CO2-equivalent: 0t
Measuring ranges
temperature: 12x -20…100°C
pressure: 2x 0…10bar; 2x -1…9bar
flow rate: 3x 0…1,5L/min
power: 1x 0…750W, 1x 0…3kW
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase, 230V, 60Hz, 3 phases
