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This paper presents the design, modeling and simulation of hybrid power system driven by two sources of renewable energy. The first studied system is a photovoltaic generator, which is a DS-100M model consists of six models connected in series and it is linked to a DC/AC inverter where the MPPT controller, based on the Perturb and Observe technique, is applied. The second one is a small wind turbine...
In this paper, a fuzzy logic controller is developed in order to control the inside temperature and relative humidity inside an agricultural greenhouse. First, a thermal dynamic model was developed to describe the greenhouse environment and to predict the inside temperature and relative humidity. The agricultural greenhouse was modeled using Matlab-Simulink environment. The simulation results showed...
This paper presents a dynamic model of an agricultural greenhouse in order to predict the air temperature and the relative humidity using Matlab/Simulink environment. It describes the transfer of heat and water vapor inside the greenhouse during four days in winter. The simulation results showed that the temperature and the humidity of the internal air vary with the weather conditions (solar radiation,...
This paper presents a study on the use of ice to improve the energy efficiency of a domestic refrigerator by applying a pseudo bond graph model that describes the thermal transfers sustained by a quantity of ice introduced inside the cavity of refrigeration. The use of ice resulted in a global energy saving of 4.68%. The effect of ice was found to be more significant during the transitional regime...
This paper aims to prove the efficiency of using the free, abundant cold air flow stemming from the outside in high altitude to enhance the cooling inside a refrigeration cavity and to reduce the energy consumption. The cold air flow is spread out inside a cavity covering the side wall of the appliance and, which is connected to the inlet and outlet conducts. For that purpose, a Simulink model is...
A PI controller and a generalized predictive control strategy of the temperature inside a cavity of refrigeration are proposed, using Matlab/Simulink environment. The control strategies were applied to a third-order discrete state space system, which computes the internal air temperature according to the temperature at the level of the evaporator exchanger, under the influence of the ambient temperature...
The paper presents a pseudo bond graph model of a thermo-hydraulic system which is composed by two warm and cold water pipes, a plastic tank and an evacuation pipe. This model is designed on 20sim software and it allows varying the temperature, inside the tank, by acting on the mass flows of the warm and cold water, as well as on the evacuation pipe. A simulation is done for constant and variable...
In this paper, we propose an implementation of a synthesizable VHDL program of generalized predictive control (GPC) without constraints on a map XC3S700A Xilinx Starter Kit using the Xilinx ISE 10.1 software. The control strategy was applied to a second order state system. The VHDL language was used as a programming tool. Real variables were described with the fixed-point representation to overcome...
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