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Comparing the Performance of Several Control Methods on the Air Handling unit in Special Condition

Setayesh, Hassan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47662 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moradi, Hamed; Alasti, Aria
  7. Abstract:
  8. Air-handling unit (AHU) is one of the installations that is responsible to control the temperature and humidity inside a space using the heating, cooling, humidifier and drying air. At present, energy efficiency in building is an important issue to maintain the comfort conditions. One of the most common ways to optimize the performance of industrial installations is the use of control systems, which leads to the reduction in both of the costs and energy consumption. In this research, a multivariable nonlinear dynamic model of the AHU with one zone in the VAV (variable air volume) system for working in summer is considered. At first, introduction, limitations and driving the equations for the system is expressed. Next system equations including the concentration are extended. Indoor temperature, relative humidity and carbon dioxide concentration are controlled via manipulation of valve positions of air, cold water flow rate and fresh air gate. Due to the complexity and nonlinearity of AHU model and also existence of various operating points and uncertainty for some parameters, model uncertainties are considered. Then effective robust control to achieve the less energy consumption and providing indoor comfort conditions is designed. For this purpose, the temperature, relative humidity and concentration are controlled in a desirable manner. In this study, technic in the basis of is implemented on nonlinear model. Results are compared with the nonlinear sliding-feedback control approach. According to the results, for desired tracking objectives in terms of the robust performance specifications, the sliding-feedback controller performs better than the linear robust controller. We can enumerate expanding model, considering uncertainty and implementation linear robust controller on nonlinear expanding model, as our research innovations, also implementation sliding mode controller with using decoupling model with considering nonlinear MIMO system to SISO systems is another our research innovations
  9. Keywords:
  10. Control ; Robust Control ; Air Handling Unit ; Nonlinear Multivariate Predictor Control ; Sliding Mode Control ; Air Conditioning

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