Refrigeration driven by solar thermal energy is attractive because fossil fuels can be substituted by renewable energy whose availability usually is in phase with required cooling loads. This report presents one possible solution using as refrigerant NH3 in a solar absorption refrigeration cycle. The heat is taken from solar collectors and used to increase the temperature of the NH3 solution. There are several types of solar collectors, but in this report the evacuated-tube collectors is chosen due to the extremely high temperatures they canachieve (77°-175°C). This study is based on the variation of the COP as a function of the generator and the evaporator temperature and the variation of the FAb as a function of the generator and the evaporating temperature and conversion factor.
