Temperature control is the process whereby the change in room temperature (and the object collectively is inside) is measured or detected, and the heat energy portion into or out of the chamber is adjusted to achieve the desired average temperature.
Air-conditioning, heating, refrigerator, water heater, etc. An example of a device that performs temperature control. These are often widely classified as Controlled Threatening Burdens (TCLs).
Video Temperature control
Control loop
The house thermostat is an example of a closed control loop: It constantly assesses the current room temperature and controls the heater and/or air conditioner to increase or decrease the temperature according to user-defined settings. Simple thermostats (cheap, cheap) just replace heaters or air conditioners either on or off, and temporary and undershoot overshoot from the desired average temperature should be expected. The more expensive thermostats vary from the amount of heat or coolant provided by heating or cooling, depending on the difference between the required temperature ("setpoint") and the actual temperature. This minimizes over/undershoot. This method is called proportional control. Further improvements using accumulated (Integral) error signals and error rate changes (Derivatives) are used to form more complex PID Controllers which are the forms normally seen in industry.
Maps Temperature control
Energy balance
The temperature of an object or space increases as heat energy moves into it, increasing the average kinetic energy of the atom, for example, objects and indoor air. The heat energy leaves the object or space lowers the temperature. Heat flows from one place to another (always from a higher temperature to a lower one) by one or more of three processes: conduction, convection and radiation. In conduction, energy is passed from one atom to another via direct contact. In convection, heat energy moves by conduction into several moving fluids (such as air or water) and fluid moves from one place to another, bringing heat together. At some point the heat energy in the liquid is usually transferred to another object by conduction again. The movement of fluids can be driven by negative buoyancy, such as when colder (and hence more dense) air falls and thus moves warmer (less dense) (natural convection) air, or by a fan or pump (forced convection). In radiation, heated atoms make electromagnetic emissions absorbed by other distant atoms, either nearby or at astronomical distances. For example, the Sun emits heat as an invisible and visible electromagnetic energy. What we know as "light" is just a narrow area of ​​the electromagnetic spectrum.
If, in a place or object, the more energy received than the lost, the temperature increases. If the amount of incoming and outgoing energy is exactly the same, the temperature remains constant - there is thermal equilibrium, or thermal equilibrium.
See also
- Heat exchanger
- Heat bed heat changer
- Thermal Control System
- Thermodynamic equilibrium
- Industrial automation
- Thermal spaceship control
Source of the article : Wikipedia
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