Abstract
In this study, a design and fabrication of intermittent solar absorption refrigeration unit was
performed at Hillah city in Iraq)32.4o, 44.4o). The absorption solar unit consists of parabolic trough
concentrator (PTC) was used as solar rays mirror reflector with aperture area of 2 m2 , carbon steel
pipe inside a vacuum glass envelop with a diameter of 1.5 in as tubular receiver, condenser, storage
tank, evaporator. The aqua ammonia solution) NH4OH)is used as working fluid with different
concentration (25%, 30%, 35%, 40%). The validity and visibility of the unit were evaluated by
measurements of pressures and temperatures at different parts of the unit during a year from May
month 2014 to July month 2015. The maximum pressure and temperature is found to be 12 bar and
120oC respectively. The coefficient of performance was in the range of 0.01-0.09.
