Sistema frigorífico à adsorção utilizando carvão ativado-metanol com regeneração por energia solar.

Abstract

This work consists of the theoretical study of an adsorption refrigeration system, using the activated charcoal AC-35 / methanol pair, with regeneration by solar energy. The system operates on an intermittent cycle: refrigerated production takes place during the night, and during the day the regeneration of the adsorptive bed is achieved by the thermal conversion of solar energy. a calculation program was designed to simulate the operation of the refrigerator, depending on the of the following meteorological data: global solar irradiation, air temperature and humidity environment and wind speed. The solar capture surface is 1 m2, the amount of methanol initially introduced into the system and 7.6 liters and the reactor contains 20 kg of coal activated. Two types of coverage of the solar collector / reactor component were considered: with a single stained glass window, and another with a double stained glass window semi-transparent insulation (TIM cover). The thermal conversion efficiency of the system the latter type of coverage was 40% higher than that obtained with the a good agreement between these values ​​and those resulting from experimental works found in the literature. The simulation results for the days average of the hottest six months of João Pessoa-PB indicate that the minimum production of ice was about 7 kg in February, and the maximum was 10 kg in December. O The mean value of the net solar performance coefficients obtained was 0.063, in the case of simple coverage, and 0.129 for the TIM coverage case, for amounts of energy solar incident of 20 to 23 MJ / m2.