The objective of this work is to model initially, the different components of a single-bed adsorption system with intermittent cold production operating with hot water coming from either biogas (from methanation of animal organic waste), or a flat sensor. Then, in a second step, to the Simulink resolution to determine the evolutions of the desorption temperatures for the two working couples (Thmax of 180 °C and 220 °C), of the adsorbed fraction (6 kg/s for the zeolite water and 4 kg/s for silica gel-water), COP (coefficient of refrigeration performance) of the order of 0.34 for silica gel-water and 0.4 for zeolite-water. These results were compared to those found in the literature for validation. It should be noted that the heat transfer fluid used is water, which has a cold production range between 0 °C and 10 °C (cooling applications) and that modeling uses the Dormand-Price OD45 method.

This paper presents an energy analysis of a counter-flow plate heat exchanger operating in stationary mode. The exchanger comprises a rectangular plate of which we vary the heat transfer surface (by fixing its width and varying its length) and analyze the evolution of some parameters as a function of this heat transfer surface. The parameters to be analyzed are the NTU (number of transfer units), the effectiveness, the temperatures of both primary and secondary fluids and the heat flux. The analysis carried out will help understand the behavior of the counter-flow plate heat exchanger operating in stationary mode. Then, the heat transfer surface of the exchanger is determined for the sizing of a counter-flow plate heat exchanger intended to produce hot air for drying. That plate heat exchanger uses water vapor heated by geothermal energy as a primary fluid and atmospheric air as a secondary fluid. The products to be dried are onions with a mass flow of water to be evacuated of 100 kg/h.

In this work, we make a detailed analysis of the effects of the operating temperatures (Ta, Te, Tc, and Tg) of our solar adsorption refrigerator using the activated carbon-methanol couple on the thermal coefficient of performance (COPth) and on the quantity of methanol cycled in this machine. The mathematical model used in this part is based on the equation of state of the Dubinin-Astakhov model and the quantities of heat involved during the thermodynamic cycle of the refrigerator. For the validity of our mathematical model, the result of the calculation of the coefficient of performance obtained is compared with the result of Ch. Wassila, who had to work in this field by obtaining very satisfactory results compared to those available in the literature.

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