How To Work Thermostat in rafrigration system
All thermostats basically work the same way: they sense/detect a change in temperature above or below a set point then send a signal to the unit to turn on or off. The first themostats used a coiled bimetal strip. Because different metals expand at different rates, the strip would move up or down in reaction to temperature change. A low voltage electrode would be attached to the end of the strip which would make contact with the control circuit of the unit. Modern thermostats utilize solid state electronic sensors and control circuits to accomplish the same function.
A thermometer, then, measures how much heat is present. If the heat level reaches a certain, um, level, the refrigeration mechanism kicks, and the refrigerant starts its trip through a maze of intestine-like coils, and the warm air is removed.
That’s the big picture, anyway. Let’s dive in and explore the process in greater detail.
A refrigerator thermostat/cold control is basically the brains of the refrigerator cooling system—it runs the show.
Thermostats are typically found inside the refrigerator and have a knob that allows users to adjust the temperature setting. Once a user sets the desired temperature, the thermostat maintains that temperature by controlling the flow of electricity to the compressor. If the thermostat is the brain, the compressor is the heart of the operation, responsible for pumping the refrigerant through the coils.
When the air inside the refrigerator is at the desired temperature, the thermostat stops the flow of electricity to the compressor. When the thermostat senses too much heat, it allows electricity to flow, activating the compressor.
How does the thermostat control the electricity, you ask?
In most commercial refrigerators, the thermostat has a capillary tube filled with gas. As the temperature in the fridge increases, the gas expands and pushes on a diaphragm, which operates a set of contacts which in turn operates the compressor.
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