Refrigeration and Air Conditioning Technology Engineering Capacity Control in Refrigeration Systems
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
[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
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