Abstract
Line concentrating collectors are being used for heating and cooling. The decisive advantage of these collectors in comparison with other flat-plate collectors when they are used to power absorption cooling systems is their higher working temperature leading to a higher chiller coefficient of performance (COP) and less collector area and chiller capacity. The line concentrator collector uses a small micro-motor to track the sun in its daily east-west cycle. Due to environmental problems in the site (humidity, dust and excessive heat) the tracking system has failed. Major design modifications are explained to run the system trouble free. Absorption chiller testing showed serious limitations in running the system under fired and at higher condenser temperature as the machine produces less than half the expected output. Running the system should be optimized by increasing the generator temperature and decreasing the cooling water temperature (open-cycle cooling from an underground well was used). The major concern for the solar air-conditioning systems is mainly after applying serious energy conservation measures and thermal insulation to the building. There is certain threshold value for system operation and below that limit the system should not operate or it will be wasting electrical energy not saving it.
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