Study of the Performance Characteristics of a Solar Concentrator for Production of Thermal Energy

Abstract This paper presents studies of the optical-energy characteristics of a parabolic solar collector for production of thermal energy for heating a building. The results of calculations, three-dimensional and topological distribution of energy in the focal zone of a solar concentrator with a diameter of 6.36 m installed at the Institute of Materials Science, Academy of Sciences of the Republic of Uzbekistan are presented. A mathematical model of the thermal regime of a solar concentrator is proposed, calculations are carried out to determine the operating temperature and the efficiency of the receiver. For efficient conversion of concentrated solar radiation, a receiver was developed from a solid copper pipe with a diameter of 12 mm in the form of a single cylindrical spiral. The outlet diameter of such a receiver was D = 200 mm. To reduce the loss from the outside, the receiver is covered with asbestos material and cement with a thickness of 20 mm. The degree of geometric concentration of the solar concentrator is 2126; the power is 18.03 kW at 800 W/m2 of solar radiation. Calculations show that the average daily thermal efficiency of the concentrator across the seasons of the year remains high (over 25%), and the system can also be operated for heating buildings.

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