Refrigeration system with two-stage compression Low temperature refrigeration system; compression with injection intercooler and additional refrigerant supercooling Features - compression refrigeration system with two-stage compression to achieve particularly low temperatures - injection intercooling - heat exchanger for additional refrigerant supercooling - real-time representation of the process in the log p-h diagram of the software Learning objectives/experiments - design and function of a refrigeration system with two-stage compression and injection intercooling - effect of the inlet temperature at the HP compressor on the efficiency of the compression -- with intercooling -- without intercooling - effect of the additional refrigerant intercooling - distribution of the compressor pressure ratios - represent and understand the refrigeration cycle process in the log p-h diagram Specification [1] refrigeration system with two-stage compression [2] hermetic low and high pressure compressors [3] adjustable intercooling via refrigerant injection [4] heat exchange for additional supercooling of the liquid refrigerant [5] closed refrigeration chamber contains evaporator with fan and adjustable electric heater as cooling load [6] digital display for temperatures, drive power of the compressors and cooling load power [7] real-time representation of the process in the log p-h diagram of the software [8] GUNT software for data acquisition via USB under Windows 10 [9] refrigerant R449A, GWP: 1397 Technical data 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: 702W at -25/55°C Refrigerant - R449A - GWP: 1397 - filling volume: 1,29kg - CO2-equivalent: 1,8t Measuring ranges - flow rate: 2...29L/h, 4...40L/h - pressure: 1x -1...15bar, 2x -1...24bar - temperature: 8x -75...125°C - power: -- 0...562W (heater) -- 0...750W (LP compressor) -- 0...2250W (HP compressor) 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase 230V, 60Hz, 3 phases UL/CSA optional LxWxH: 1900x790x1900mm Weight: approx. 283kg