Air doc mechanical electrical llc
Instead, the heating or cooling equipment runs at full capacity until the set temperature is reached, then shuts off. A thermostat is an example of a " bang-bang controller" as the heating or cooling equipment output is not proportional to the difference between actual temperature and the temperature setpoint. Electronic thermostats, instead, use a thermistor or other semiconductor sensor that requires amplification and processing to control the heating or cooling equipment. In one form, the mechanical thermostat, a bimetallic strip in the form of a coil directly operates electrical contacts that control the heating or cooling source. Thermostats use different types of sensors to measure the temperature. Examples include building heating, central heating, and air conditioners, kitchen equipment such as ovens and refrigerators, and medical and scientific incubators. Thermostats are used in any device or system that heats or cools to a setpoint 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. 8.2 Combination heating/cooling regulationĪ 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.8.1 Ignition sequences in modern conventional systems.6.1.1 Contact configuration nomenclature.6 Electrical and analog electronic thermostats.5.2.2 Shower and other hot water controls.The word thermostat is derived from the Greek words θερμός thermos, "hot" and στατός statos, "standing, stationary". Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in an automotive thermostat. Ī thermostat operates as a "closed loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States.
In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostats are used in any device or system that heats or cools to a setpoint temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. A Honeywell electronic thermostat in a retail storeĪ thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.