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工业生产使用的换热设备通常为管壳式。目前,新型高效管壳式换热器的k值虽已提高了不少,但伴随着气速增高,阻力增大,却使系统能耗增加。 本文简要介绍一种热管和热管式换热器的原理、结构和性能。 一、热管和热管换热器简介 热管基本结构是将金属管抽成负压,充入工质后封闭。典型的热管内壁贴有具有毛细力的多孔材料。省去吸液芯,靠重力使工质回流的叫重力式热管。本文介绍的就是这种重力式热管(以下简称热管)。 重力热管一般应垂直安置,至少应与水平面成10°以上倾角。热源在下端,由于管内呈负压,工质沸点降低,蒸汽上升的阻力小,携带汽化潜热迅速冲到上端。蒸汽在上端管壁上冷凝,在重力作用下又流回下端,如此不断地周而复始,以传输热量。
The heat exchange equipment used in industrial production is usually a shell and tube type. At present, the new high efficiency shell and tube heat exchanger although the k value has improved a lot, but with the gas velocity increases, the resistance increases, but the system energy consumption increases. This article briefly describes the principle, structure and performance of a heat pipe and heat pipe heat exchanger. First, the heat pipe and heat pipe heat exchanger Introduction The basic structure of the heat pipe is drawn to a negative pressure metal tube, filled with working fluid closed. The inner wall of a typical heat pipe is attached with a porous capillary material. Eliminate wick, rely on gravity to make the working fluid return is called gravity heat pipe. This article describes the gravity heat pipe (hereinafter referred to as heat pipe). Gravity heat pipe should generally be placed vertically, at least 10 ° angle with the horizontal plane. Heat source at the bottom, due to negative pressure tube, the working fluid boiling point lower resistance to steam rise, carrying vaporization latent heat quickly rushed to the top. The steam condenses on the upper tube wall and flows back to the lower end under the action of gravity, so that it can be continuously circulated to transfer heat.