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Personne àcontacter Ms. shadow
Houyu, Changzou, Jiangsu
Structure and Principle: At sea level water boils at **0oC (**2oF), but if you climb to the top of a mountain the boiling temperature will be less that **0oC (**2oF). This is due to the difference in air pressure. Based on this principle of water boiling at a lower temperature with decreased air pressure, by evacuating the heat pipe, we can achieve the same result. The heat pipes used in solar collectors have a boiling point of only *0oC (*6oF). So when the heat pipe is heated above *0oC (*6oF) the water vaporizes. This va pour rapidly rises to the top of the heat pipe transferring heat. As the heat is lost at the condenser (top), the va pour condenses to form a liquid (water) and returns to the bottom of the heat pipe to once again repeat the process. When the heat pipe is shaken, the ball of water can be heard rattling inside. Although it is just water, it sounds like a piece of metal rattling inside. Quality Control: Often heat pipes use a wick or capillary system to aid the flow of the liquid, but for the heat pipes used in solar collectors no such system is required as the interior surface of the copper is extremely smooth, allowing efficient flow of the liquid back to the bottom. Also heat pipes are not installed horizontally. Heat pipes can be designed to transfer heat horizontally, but the cost is much higher. Freeze Protection: Even though the heat pipe is a vacuum and the boiling point has been reduced to only ****0o C (*6o F), the freezing point is still the same as water at sea level, 0o C (*2o F). Because the heat pipe is located within the evacuated glass tube, brief overnight temperatures as low as **0o C (*4o F) will not cause the heat pipe to freeze. Plain water heat pipes will be damaged by repeated freezing, but heat pipes are protected against freeze related damage.
