| Popis: |
In this study, we performed a thermal analysis of an adsorption refrigeration system driven by a parabolic trough collector using an activated carbon AC-35/ammonia adsorption pair under the following operating conditions: Ta = 25°C, Tev = -5°C, and 30 < Tg < -120°C. The main objectives were to develop a mathematical model that predicts the spatio-temporal evolution of the state variables (i.e., the temperature, mass, and pressure) at the level of an adsorption solar refrigeration system operating in continuous mode and to investigate the influence of the main parameters on the thermal performance coefficient of the studied machine. This model is based on the energy and mass conservation equations in a porous medium. The Dubinin-Astakhov equation was used to describe the adsorption kinetics. The obtained differential equations system is highly nonlinear and was solved during both the heating and cooling phases, by the fourth-order Runge-Kutta finite-difference method. The results of the analysis led us to conclude that the proposed model satisfactorily describes the adsorption kinetics and both the condensation and generation temperatures have a substantial impact on the thermal coefficient of performance (COPh) of the cooling system. In addition, the COPh reached by our cooling system was 0.63. |
