| 摘要 |
FIELD: power engineering; heat-transfer systems, external-combustion engine; power-generating facilities. SUBSTANCE: heat exchanger has chamber accommodating working-medium tube rigidly and coaxially fixed therein, and in addition, it is provided with absorbing lenses with mechanism rotating them about chamber; lenses are placed outside the chamber along tube over its entire length and at focal distance from it. Rotating mechanism has sun position tracking system which also functions to follow center of each lens and its focus on conventional straight line perpendicular to tangential line at focal point on tube surface; chamber is mounted for rotation through elevation angle to ensure perpendicular position of mentioned conventional straight line relative to generating line of tube cylindrical surface depending on sun position on dome of the sky throughout the year. Cylindrical wall of chamber is made of transparent material, such as glass, and filled with inert gas. Tube is made of high-melting metal and its heat-transfer surface is enlarged by inserting high-melting metal rod of screw thread as deep as almost to its center line. Covers and pipe connections are made of heat-insulating material capable of sustaining temperature as high as 2000 C. Working medium heating temperature in heat exchanger depends on heating temperature of tube surface, its flow speed through tube, length of tube, quantity and surface area of convex lenses. EFFECT: improved pollution control of environment due to use of solar energy for heating working medium. |
