Capacity Control in Refrigeration Systems Teaching Equipment Fridge Training Equipment

SR2042 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 R134a, 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