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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 56735 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Alasty, Aria; Salarieh, Hassan
- Abstract:
- Today, energy production as well as environmental damage caused by non-renewable fuels has become one of the serious challenges of Society. Thermoelectrics are among the systems that can be used as a new source for cooling and heating production as well as electric energy production.Thermoelectrics can be divided into two categories: Cooler/thermal thermoelectrics and thermoelectric generators. Cooler/thermal thermoelectrics can be used as a source for producing cooling and heating in various applications, among its advantages are the non-use of environment-hazardous refrigerants, suitable for use in small spaces, not heavy and complicated, easy maintenance and low cost. It is also possible to re-produce electrical energy by reusing and reviving the thermal energy loss of manufacturing industries and factories and other sources of heat loss by thermoelectric generators, which can be called as a solution for energy production. One of the important things in thermoelectrics is to control the temperature of its cold surface in order to use it in different applications. Due to the presence of non-linear factors such as semiconductors, heatsink, the difference in thermoelectric behavior in different environmental conditions and their dynamic dependence on temperature changes, designing a controller that can withstand these non-linear factors and noise and disturbances as well as the temperature of the surfaces It is very important to bring the thermoelectric to the desired temperature. For this reason, it is important to choose the type of controller to achieve the intended control goals, and the fractional order PID controller is used for this purpose. In order to implement this controller and the lack of access to thermoelectric dynamics, experiments were first designed in different ambient temperatures and by collecting data from the thermoelectric consumption current and the temperature of its cold surface as the input and output of the thermoelectric transfer function and using the identification algorithms for determined the dynamics of thermoelectric in these ambient temperatures. Then, using the particle swarm algorithm, two types of normal PID controllers and fractional order PID controllers are designed and implemented on thermoelectric in these different environmental conditions. Finally, by comparing the performance of these two types of controllers in terms of overshoot, settling time, steady state error and resistance to noise and disturbance, the performance of fractional order PID controller is better in all environmental conditions
- Keywords:
- Thermoelectric ; Coolers ; Proportional-Integral-Derivative (PID)Controller ; Fractional Proportional-Integral Controller ; Fractional Order System ; Cooler Thermoelectrics
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