Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
HYBRID CONTROL DEVELOPMENT FOR A HOUSEHOLD REFRIGERATION SYSTEM WITH TWO COMPARTMENTS
Submission Author:
Murilo Ferreira Vitor , SC
Co-Authors:
Murilo Ferreira Vitor, guilherme senger, Guilherme Matias, Alexsandro Santos Silveira, Alexandre Trofino
Presenter: Guilherme Matias
doi://10.26678/ABCM.ENCIT2016.CIT2016-0016
Abstract
In this work we develop a temperature control for a household refrigerator with two compartments: freezer and fresh-food. A real refrigerator was used in the experimental tests. A model for the freezer temperature dynamic due to changes in compressor speed was experimentally identified. A PI controller for compressor speed was designed. As the minimum compressor speed can exceed the speed corresponding to some desired equilibrium conditions, an on-off controller was designed to match the cooling capacity to the thermal load in these cases. A switching rule was empirically designed to change from PI to on-off controller and vice-versa. The fresh-food capacity is controlled by a damper which regulates the air flow from freezer to fresh-food. The damper control utilized was the one already embedded in the appliance and was treated as a disturbance to the compressor controller. Steady state tests and transient tests were carried out to evaluate the controller performance. The controller was able to reject disturbances with no overshoot and to keep the desired reference of freezer temperature. This is accomplished respecting the minimum compressor speed requirement.
Keywords
Household Refrigerator, PI Controller, on-off controller, experimental development, Household Refrigerator, PI Controller, on-off controller, experimental development, Household Refrigerator, PI Controller, on-off controller, experimental development
