Refrigeration system with refrigeration and freezing chamber Simulation of 18 electrical and hydraulical faults Features - refrigeration system with two different evaporation pressures - simulation of 18 faults Learning objectives/experiments - design and components of a refrigeration system with 2 evaporators - components and their functions -- compressor, condenser, evaporator -- thermostatic expansion valve -- evaporation pressure controller -- pressure switch -- electric defrost heater - thermodynamics of the refrigeration cycle -- effect of refrigerant supercooling -- representation of the thermodynamic cycle in the log p-h diagram -- determination of important characteristic variables: coefficient of performance, refrigeration capacity, compressor work - fault finding in refrigeration system components Specification [1] investigation of a refrigeration system with refrigeration and freezing chambers [2] refrigeration circuit with compressor, condenser and 2 evaporators with thermostatic expansion valve and evaporation pressure controller [3] insulated freezing chamber with fan and electric defrost heater [4] insulated refrigeration chamber with evaporation pressure controller [5] heat exchanger for refrigerant supercooling [6] individual or parallel operation of the chambers via solenoid valves [7] sensors record pressure and temperature [8] refrigerant mass flow rate calculated in the software from recorded measured values [9] simulation of 18 faults [10] GUNT software for data acquisition via USB under Windows 10 [11] refrigerant R513A, GWP: 631 Technical data Compressor - power consumption: 565W at 7,2/54,4°C - refrigeration capacity: 1363W at 7,2/54,4°C Condenser with fan - volumetric air flow rate: 290m3/h - transfer area: 1,5m2 Refrigeration chamber - evaporator transfer area: 1,06m2 Freezing chamber - evaporator transfer area: 2,42m2 - volumetric air flow rate, fan: 135m3/h - electric defrost heater: approx. 150W Evaporation pressure controller: 0...5,5bar Refrigerant: R513A, GWP: 631 - filling volume: 1,5kg - CO2-equivalent: 0,9t Measuring ranges - temperature: 12x -50...120°C - pressure: 3x -1...15bar, 3x -1...9bar, 3x -1...24bar - power: 0...1125W - flow rate: 1...11,5L/h 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 2000x660x1900mm Weight: approx. 219kg