A NOVEL SOLAR INTERMITTENT REFRIGERATION SYSTEM FOR ICE PRODUCTION 1 W. Rivera*, 1G. Moreno-Quintanar, 2C. O. Rivera and J.F. Martínez Centro de Investigación en Energía, Universidad Nacional Autónoma de México A.P.34, 62580 Temixco, Mor., México Abstract A novel solar intermittent refrigeration system for ice production has been developed in the Centro de Investigación en Energía of the Universidad Nacional Autónoma de México. The system was designed to operate with the ammonia/lithium nitrate mixture for a maximum capacity of 8 kg/day of ice. Because the lithium nitrate does not evaporate at the operating conditions, a rectifier is not necessary in the system. The system consists of a cylindrical parabolic collector acting as the generator during the generation phase and as absorber in the evaporation one. The system operates exclusively with solar energy and no moving parts are required. Several test runs were made for different solution concentrations varying from 45% to 50%. Evaporator temperatures as low as - 8°C were obtained for a period of time up to 8 hours. The coefficients of performance varied from 0.055 to 0.088 depending on the solar radiation, the solution concentration and the ambient temperatures. The lowest coefficients of performance were obtained at the lowest solution concentrations while the highest were obtained at the solution concentrations of 49% and 50%. The system developed proved to be a good technological alternative for ice production where electricity supply is not available.