Abstract :
A novel solar intermittent refrigeration system for ice production developed in the Centro de Investigacio´n en Energı´a of the Universidad
Nacional Auto´noma de Me´xico is presented. The system operates with the ammonia/lithium nitrate mixture. The system developed
has a nominal capacity of 8 kg of ice/day. It consists of a cylindrical parabolic collector acting as generator–absorber. Evaporator temperatures
as low as 11 C were obtained for several hours with solar coefficients of performance up to 0.08. It was found that the coefficient
of performance increases with the increment of solar radiation and the solution concentration. A dependency of the coefficient of
performance was not founded against the cooling water temperature. Also it was found that the maximum operating pressure increases
meanwhile the generation temperature decreases with an increase of the solution concentration.
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