Investigation of Solar Collector Irradiated from Both Sides
Research Institute of Agricultural Machinery, Latvia University of Agriculture,
Institute Street 1, LV–2130, Ulbroka, Riga region, Latvia
e-mail: Imants.Ziemelis@llu.lv; Liene.Kancevica@llu.lv
The ordinary flat plate solar collector receives solar radiation only from one side of its surface. Another side is covered with a heat barrier. The solar collector with reflectors has been developed and examined to track the sun. The absorber of this type of a collector was irradiated from both sides. The experimentally obtained energetic parameters of the collector tracking the sun have been compared to those of the ordinary flat plate solar collector. In order to complete the experiment, a special stand has been developed. The experimental investigation has been carried out at the intensity of radiation 2,000, 1,000 and 500 W m -2 in different combinations. The temperature has been measured in certain points of different parts of the collector by several thermocouples. With the aid of a multi-meter, the obtained results were collected to the memory of a computer, and later processed and analyzed. When a collector surface is tracking the sun, the heat energy produced by the collector is 1.4 to 1.5 times higher in comparison with a stationary solar collector of the same size. A solar collector tracking the sun and irradiated from both sides depending on the reflection quality of the reflector’s material is able produce about 2.5 times more heat energy then a stationary flat plate solar collector irradiated only from one side.
efficiency, solar collectors, sun