RAC 032 : Refrigeration System With Two Stage Compression
A. Learning Objectives/Experiments
❖ Represent and understand the refrigeration cycle process in the log p-h diagram
❖ Design and function of a refrigeration system test rig with two-stage compression and injection inter-cooling
❖ Effect of the inlet temperature at the HP compressor on the efficiency of the compression
➢ With inter-cooling
➢ Without inter-cooling
❖ Effect of the additional refrigerant inter- cooling
❖ Distribution of the compressor pressure ratios Features
B. Features
❖ Compression refrigeration system with two- stage compression to achieve particularly low temperatures
❖ Injection inter-cooling
❖ Heat exchanger for additional refrigerant super cooling
❖ Real-time representation of the process in the log p-h diagram of the software Specification / Technical data
C. Specification / Technical data
❖ A unit that helps to study the design and functionality of a refrigeration system with two-stage compression and injection inter-cooling
❖ Hermetic sealed low and high pressure compressors
❖ The effect of the inlet temperature at the HP compressor on the efficiency of the compression (with inter-cooling /without inter-cooling).
❖ Low Pressure Compressor(LP)
➢ Power Consumption: 250 to 300 W
➢ Refrigeration Capacity:500 to 600 W
❖ High Pressure Compressor(HP)
➢ Power Consumption: 750
➢ Refrigeration Capacity:700 W
❖ Minimum temperature: -20⁰C to -25⁰C
❖ Measuring ranges:
➢ 2 nos. of Flow rate: 2-25 L/h
➢ 3 nos. of Pressure:0-20 bar
➢ 8nos. of Temperature:-70 to 100⁰c
❖ Power:
➢ 0…500 W(Heater)
➢ 0….700 W (LP Compressor)
➢ 0….2000 W (HP Compressor)
❖ Refrigeration system with two-stage compression
❖ Adjustable inter-cooling via refrigerant injection
❖ Closed refrigeration chamber contains evaporator with fan and adjustable electric heater as cooling load
❖ Digital display for temperatures, drive power of the compressors and cooling load power
❖ Visualization of experiment in a see through vessel.
❖ Equipment data acquisition system and related software
❖ Real-time representation of the process in the log p-h diagram of the software
❖ Software for data acquisition via USB under Windows 7, 8.1, 10
❖ Refrigerant R449A
❖ Low pressure compressor (LP)
➢ Power consumption: 275W at -10/55°C
➢ Refrigeration capacity: 583W at -10/55°C
❖ High pressure compressor (HP)
➢ Power consumption: Aprrox.841W at- 25/55°C
➢ Refrigeration capacity: Approx.702W at -25/55°C
❖ Refrigerant
➢ R449A
➢ Filling volume: 1.29kg
➢ CO2-equivalent: 1.8t
❖ Measuring ranges
➢ Flow rate: 2…29 L/h, 4…40 L/h
➢ Pressure: 1x -1…15bar, 2x -1…24bar
➢ Temperature: 8x -75…125°C
❖ Power:
➢ 0…562W (heater) Approx.
➢ 0…750W (LP compressor)Approx.
➢ 0…2250W (HP compressor)Approx.
❖ Dimensions and weight
➢ Lxwxh: 1950x800x1950mm
➢ Weight: approx. 285kg
