Compression refrigeration system with two-stage compression to achieve particularly low temperatures.
The two compressors are connected in series, with each compressor only having a relatively low pressure ratio.
The unit represents the refrigeration cycle process in the p-h diagram.
The unit contains hermetic low and high pressure compressors and adjustable intercooling via refrigerant injection
Heat exchange for additional super-cooling of the liquid refrigerant 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