In this video, we show you the function of mechanical thermostat.
The thermostat what we have used in this video is for freezers. This is only to make you understand that who a thermostat works.
The range of thermostat may vary as per requirement.
What is a Thermostat?
A thermostat is a component which senses the temperature of a system so that the system's temperature is maintained near a desired setpoint.
A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control, to such as automotive coolant control, but is also used in many other applications, such as an electric clothes iron.
Working of a Thermostat
Thermostats work on the principle of thermal expansion. This principle governs the switching off or on of the electric circuit. The most common types of mechanical thermostats typically use either bimetallic strips or bellows filled with gas. While digital thermostats use the same principle, but everything is controlled by a chip and built-in minicomputer.
Bimetallic Strips: As the name indicates, this thermostat has two pieces of metals, which have varying coefficients of expansion, but are connected to each other with the help of bolts to form a bimetallic strip. This strip works like a bridge to connect or disconnect the electric circuit of the heating or cooling system. When the bridge is down, the circuit gets completed, causing the heating or cooling to come on. However, with time, the strip gets hot, causing one of the metal pieces to get hotter than the other. The hotter strip expands, causing it curve and bend. This, in turn, breaks the circuit, the heating or cooling switches off.
Once the circuit is broken, there is no electricity passing through the bimetallic strip. So, it begins to cool down gradually. The expanded metal piece starts contracting, causing it to return to its original size. The moment that happens, the circuit is completed once again and the heating or cooling resumes.
You can adjust the temperature using a thermostat to change when the electric circuit of the heating or cooling unit completes or breaks off. The rate at which the metal in the bimetallic strip cools is dependent on how well your home is insulated. In typical cases, it takes about an hour or so for the bimetallic strip to cool down and the thermostat to switch on.
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