單一真空管U型拋物面太陽能集熱系統之研究

Study on single glass evacuated tube collector with a U-shape parabolic trough concentrator

羅瑞格(Rodrigo Eduardo Blanco Avelar)

指導教授 ： 陳文立

崑山科技大學/工程學院/機械工程研究所/碩士(2009年)

https://doi.org/10.6828/KSU.2009.00005

摘要

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關鍵字

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並列摘要

This master thesis constructed a device to investigate the advantages of the combination of two solar thermal power technologies. One of them is concentrating solar collectors called the parabolic solar trough concentrator which is often used where higher temperature heating is desirable, there are large thermal loads, or where there are limitations at the area available for installing solar collectors, due to its capability of providing more energy per unit of collector surface area. The other one is the evacuated tube collector, from which the glass evacuated tube and the fluid storage tank were employed to construct a device with thermosyphon circulation which requires no pumping. The use of expensive and high power consuming components was avoided thanks to a simple, versatile, economic and environmental friendly approach design. Two kinds of U-shape collectors were tested with different material surface, one where the collector was made of metalized acrylic mirrors with reflectance of 0.83, and the other, a film of silver adhesive tape with reflectance of 0.80. As solar concentrated power technologies have been employed, it is necessary to construct a tracking system. Here, one-axis tracking system with simple mechanical and electronic components was built. The mechanical part consists of frame holding the U-shape collector in place together with the chassis and a design producing a declination angle of 23o which can be adjusted manually if necessary. At the same time, this arrangement gave the model the axial mobility needed, powered by an electric low power consuming step motor which manages the focusing movement of the concentrator. The step motor is controlled by an electronic circuit mainly governed by a PIC microcontroller. The entire tracking system is powered by a battery that is being constantly recharged by a photovoltaic cell, making the prototype independent and versatile as it features its own power source. The experiments, performed with the above described prototype, showed that the concentrated solar power gathered by the two different kinds of collectors with an effective area of 68 centimeters long and 55 centimeters wide, focused along the evacuated tube could achieve low level temperatures on the heat removal fluid, water in this case, fast and efficiently, on a clear sky sunny day with an average solar energy reading of 800 to 1,000 W/m2 in Taiwan.

並列關鍵字

Solar Energy ； Parabolic concentrator

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