12 Questions
What must the refrigeration plant's load always equal?
The cooling load
What will happen if the plant operates at full capacity when the load is low?
The temperature of the refrigerated medium will rise above the set point
What is used to directly adjust the compressor capacity?
A control system that can directly adjust compressor capacity
How can compressor capacity be adjusted?
By cycling the compressor on and off (two-position control)
What is used to detect the temperature of the refrigerated medium?
A thermostat with a bimetal or filled system thermal sensing element
How can the system capacity control influence the amount of refrigerant?
By responding to changes in evaporator capacity, which means the compressor is controlled indirectly
What is the primary function of a thermostat in a refrigeration system?
To start or stop the compressor based on temperature deviations
What type of thermostat can directly control the power supply to small compressor motors?
Bimetal thermostat
How does a filled system remote bulb thermometer control a compressor?
By actuating a magnetic motor starter (contactor) to start or stop the compressor
What is the purpose of the temperature differential setting in a thermostat?
To prevent the compressor from short-cycling
What is the relationship between the cut-in and cut-out points of a thermostat?
The cut-in point is always at a higher temperature than the cut-out point
Which type of thermostat can be used to produce variable resistance, variable voltage, or variable current, or send digital signals to control systems?
Thermostats with electrical resistance elements or electronic temperature sensors
Test your knowledge on refrigeration plant operations including the relationship between plant load and cooling load, impact of load variations on refrigerated medium temperature, and system capacity control through adjusting refrigerant circulation. Explore concepts related to compressor operation and maintaining set points.
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