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A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.
Programming the morning temperature to be 21° C at 7:00 a.m., for instance, ensures that the temperature would then be 21 °C, whereas less sophisticated programmable thermostat would simply start working toward 21° at 7:00 a.m. Thus a PID controller sets the time at which the system should be activated in order to reach the desired ...
It can also be used as a temperature controller that either heats or cools. This technology is far less commonly applied to refrigeration than vapor-compression refrigeration is. The primary advantages of a Peltier cooler compared to a vapor-compression refrigerator are its lack of moving parts or circulating liquid, very long life ...
Toasters, coffee makers, refrigerators, freezers, hair dryers, etc. all rely on thermistors for proper temperature control. NTC thermistors come in bare and lugged forms, the former is for point sensing to achieve high accuracy for specific points, such as laser diode die, etc. [ 25 ]
Thermoelectric junctions are typically around 10% as efficient as the ideal Carnot cycle refrigerator, compared with 40% achieved by conventional compression cycle systems. Synthetic jet air cooling A synthetic jet is produced by a continual flow of vortices that are formed by alternating brief ejection and suction of air across an opening such ...
In 1985, Johnson Controls acquired automotive seating companies Hoover Universal and Ferro Manufacturing. [10] In 1989, Johnson acquired Pan Am World Services. [11] [12] During the 2008–2009 recession, the company's president, Keith Wandell, lobbied Congress for a bailout of the companies that Johnson supplied. [13]