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太阳能集热器吸收太阳辐射的原理
来源:http://www.sdlntyn.com 发布时间:2017-6-29 15:03:28 浏览次数:471

太阳能热利用装置主要部件是太阳能集热器,是靠吸热体吸收太阳辐射,要提高集热器的效率要加强吸热体对太阳辐射的吸收能力,减少热量的散失。

The solar energy heat utilization device is mainly a solar collector, which absorbs the solar radiation by a heat absorbing body. In order to improve the efficiency of the collector, the absorption capacity of the heat absorbing body to the solar radiation is enhanced, and the heat loss is reduced.

如果在吸热体上涂黑漆,虽有0.95的吸收比,但其发射率也高达0.9,接受的热量又会辐射出去,显然涂黑漆不行,在吸热体上覆盖光谱选择性吸收涂层可较好的解决这一问题。

If the black body paint in the absorber, although there are 0.95 absorption ratio, but its transmission rate is as high as 0.9, accept the heat radiates out, apparently not in black paint, absorber covered spectral selective absorbing coating can be used to solve this problem.

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由于在地面上的太阳辐射波长主要集中在0.3μm至2.0μm,而物体的热辐射波长主要集中在2.0μm至30μm,利用这一差别,制造出有高吸收比与低发射率的涂层覆盖在吸热体上,称之为光谱选择性吸收涂层。这些涂层多为金属化合物或金属氧化物组成,其吸收比在0.9以上,发射率一般小于0.2。太阳能热利用装置主要部件是太阳能集热器,是靠吸热体吸收太阳辐射,要提高集热器的效率要加强吸热体对太阳辐射的吸收能力,减少热量的散失。

Because of the solar radiation wavelength on the ground mainly concentrated in the 0.3 m to 2 m , and the thermal radiation wavelength objects mainly concentrated in the 2 m to 30 m, with this difference, a high absorption ratio and low emissivity coating covered on the heat absorbing body, said the spectral selective absorbing coating. These coatings are mostly metal compounds or metal oxides, the absorption ratio of more than 0.9, emissivity is generally less than 0.2.

在玻璃真空管上的选择性吸收涂层多为“铝-氮/铝”或“不锈钢-碳/铝”,采用磁控溅射工艺制作,其吸收比在0.9以上、发射率小于0.1;对于铜制吸热件可用化学转换着色法生成氧化铜膜作选择性吸收涂层,是一种简单成熟的制作方法,其吸收比为0.91、发射率为0.05。

In the selective absorption coating on glass vacuum tube for aluminum - nitrogen / aluminum or stainless steel - carbon / aluminum, fabricated by magnetron sputtering process, the absorption ratio is above 0.9, emission rate is less than 0.1; the copper heat absorbing member by chemical conversion coloring method to generate copper oxide film as selective absorption coating. Is a manufacturing method of a simple and mature, the absorption ratio is 0.91 and the emission rate of 0.05.

热传导是热能在固体或静止液体中传递的方式,只要物体中有温差,热能就会从高温处向低温处传递。

Heat conduction is the way heat energy is transmitted in solid or stationary liquid. As long as there is a temperature difference in the object, heat energy is transferred from the high temperature to the low temperature.

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This article by the Ji'nan solar energy after-sales service center for you to provide, our website is: http://www.sdlntyn.com/, we will wholeheartedly enthusiasm for you to provide better service, you are welcome to visit!