ASR2042 Capacity Control in Refrigeration Systems Teaching Equipment Fridge Training Equipment
Learning Objectives / Experiments
– key devices for changing the refrigeration capacity
* thermostat
* evaporation pressure controller
* refrigeration controller
* capacity controller
* compressor with variable speed
– operation of a refrigeration controller with specification of temperatures for
* controlling the refrigeration capacity
* switching the defrost heater on and off
* switching the fans on and off
Specification
[1] methods for capacity control in refrigeration systems
[2] refrigeration circuit with compressor, condenser and 2 evaporators in insulated refrigeration chambers
[3] each refrigeration chamber with adjustable heater to generate a cooling load, thermostatic expansion valve and fan
[4] 1 refrigeration chamber with refrigeration controller for temperature control; solenoid valve, fan and defrost heater as actuators
[5] 1 refrigeration chamber with thermostat, solenoid valve and evaporation pressure controller for temperature control
[6] compressor with variable speed via frequency converter
[7] capacity controller in the compressor bypass
[8] Refrigerant AR134a, CFC-free
Technical Data
Compressor
– refrigeration capacity: approx. 560W at -5/25°C
and 1.450min-1
– drive motor: 550W
2 heaters: approx. 500W
4 fans: max. air flow: approx. 50m³/h
1 defrost heater: approx. 75W
Refrigeration controller
– 7 inputs
– 7 outputs
Evaporation pressure controller: 0…5,5bar
Thermostat: -5…20°C
Capacity controller: 0,2…6bar
Measuring ranges
– motor speed: 1.100…2.700min-1
– temperature: 3x -60…50°C
– heater power: 2x 0…1.000W
– pressure: 3x -1…9bar; 1x -1…24bar
Dimensions and Weight
LxWxH: 1.100x750x1.900mm
Weight: approx. 150kg
Required for Operation
230V, 50/60Hz, 1 phase
