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湿球的比热是怎么确定的?

我很新的湿度湿度测定法和研究,我目前学习干球湿球温度的温度测量。就我的理解而言,湿球被连接到一个水源(湿布或棉签)和水的蒸发到周围的空气温度降低了干湿球。

我能理解这个概念,但我相信我需要灯泡的热容知道确切的温度下降相比,湿球干球。然而,不同的温度计有不同的热容和可能显示不同的湿球的温度。这是如何减轻呢?如何湿球温度恒定值对于一个给定的相对湿度和干球温度尽管可能存在的各种热容为各种温度计用于测量温度?

回答

我误解了干湿球温度计的工作原理,也很困惑……我希望解释单独的混乱会帮助强调到底发生了什么你的问题……我总是被教导,作为一个悬挂式湿度计是旋转,水会蒸发通过温度计的热量,并将继续这样做,直到空气变得饱和,再也不能采取“任何更多的水。但这并不增加。因为悬挂式湿度计是移动,不断引进新的空气。处略作掩饰我猜我只是它*”也许周围的空气信封式湿度计成为饱和”* ?但一些关于仍然没有欺骗与现实…也许更重要的是,我认为只要可以带来额外的空气量,温度计将低于真实的湿球温度计值。你有无限的供应空气饱和。但是我的问题和你的真正回到温度稳定。 <hr> The fourth answer to [this Quora question][1], by Ashish Kori, as well as [this video][2] from a professor at Lund University in Sweden, are what helped open my eyes better. Basically you're starting with a thermometer covered with a wick that has an excess supply of water, and you "continually expose" it [i.e. by fanning/moving it] to an excess supply of air. And the air, thermometer, and water all start at the same temperature. The movement encourages evaporation. The evaporating water takes energy from the water... so the water cools. But as that process continues... the cooler water is now also being continually introduced to air that is warmer than it, so there is a steady transfer of energy back into the water. The movement and unlimited water and air means the process continues until the energy transfer is balanced. The drier the air, the greater the rate of evaporation, the larger the temperature drop before the energy balances. <hr> Why does all that matter? Because the thermometer is only a bystander in the energy exchange. The water is what is getting to the wet bulb temperature. Sure the thermometer (both its fluid and casing) will be factors in the energy balance for a time as it does have energy to add to the equation by being briefly warmer than the cooling water... but with the unending evaporation, that bit of extra energy is very quickly forgotten, regardless of how much of it was stored (i.e. the thermometer's heat capacity). A huge heat capacity might mean in theory that it takes slightly longer to reach equilibrium by overcoming the extra energy, but even then it really shouldn't be significant. (I would think even the thermal conductivity wouldn't be a big factor in a sling psychrometer because of all the mixing motion, so long as the wick isn't so thick as to significantly insulate the thermometer.) Aspirating ensures that any energy buildup (heat capacity storage\conductivity delays) in both dry and wetbulb thermometers is overcome. **The thermometer is only a bystander in the evaporation, and it must eventually reach the temperature that the water reaches. The thermometer's heat capacity is unimportant to the continuing energy balance.** [1]: https://www.quora.com/When-is-wet-bulb-temperature-constant-and-why [2]: https://www.youtube.com/watch?v=ktJa5rJzk0Q

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