Capacity Control And Faults In Refrigeration Systems
Capacity Control And Faults In Refrigeration Systems
Model: SR2021
Learning Objectives / Experiments
– familiarisation with the key devices for changing the refrigeration capacity
* thermostat
* capacity controller
* start-up controller
* evaporation pressure controller
* condensation pressure controller
– fault finding in refrigeration system components
– effect of refrigerant supercooling
– familiarisation with defrosting methods
* electric defrost heater
* hot gas defrosting
– representation of the thermodynamic cycle in the log p-h diagram
Specification
[1] investigation of a refrigeration system with refrigeration and freezing chambers
[2] refrigeration circuit with compressor, condenser, capacity controller, start-up controller, combined pressure switch and 2 evaporators in insulated chambers
[3] each chamber with solenoid valve, thermostat, thermostatic expansion valve, fan and heat exchanger for refrigerant supercooling
[4] refrigeration chamber with evaporation pressure controller
[5] freezing chamber with electric defrost heater and hot gas defrosting
[6] separate or parallel operation of the chambers via solenoid valves
[7] simulation of 12 faults
[8] touch panel PC for fault activation, data acquisition, evaluation and representation in the log p-h diagram
[9] refrigerant R404a
Technical Data
Compressor
– refrigeration capacity: 2440W at -10/30°C
Condenser with fan
– volumetric air flow rate: 570m³/h
Evaporator transfer areas
– refrigeration chamber: 1,12m²
– freezing chamber: 1,88m²
Electric defrost heater: approx. 125W
Capacity controller: 0,2…6bar
Start-up controller: 0,2…6bar
Thermostat: 2x -25…15°C
Evaporation pressure controller: 0…5,5bar
Measuring ranges
– temperature: 6x -50…50°C; 5x 0…100°C
– pressure: 3x -1…12,5bar; 2x -1…24bar
– flow rate: 2x 1.5…22,5L/h
– compressor power consumption: 0…5kW
Dimensions and Weight
LxWxH: 2420x780x1900mm
Weight: approx. 280kg
Required for Operation
400V, 50Hz, 3 phases or 230V, 60Hz/CSA, 3 phases