SR2021 Capacity Control And Faults In Refrigeration Systems Educational Equipment Refrigerator Training Equipment

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