Comments on: The Thermal Conductivity of Moist Air http://www.electronics-cooling.com/2003/11/the-thermal-conductivity-of-moist-air/ Dedicated to Thermal Management in the Electronics Industry Tue, 31 Jan 2012 20:43:24 +0000 hourly 1 http://wordpress.org/?v=3.2 By: Brad http://www.electronics-cooling.com/2003/11/the-thermal-conductivity-of-moist-air/comment-page-1/#comment-5284 Brad Tue, 23 Aug 2011 20:36:23 +0000 http://www.electronics-cooling.com/?p=278#comment-5284 "This will work because heating the air does not change the humidity ratio." -@Air Important to note that when he says "humidity ratio" he is refering to specific humidity - not relative humidity. I am assuming the legend in figure 1 refers to relative humidity. “This will work because heating the air does not change the humidity ratio.” -@Air
Important to note that when he says “humidity ratio” he is refering to specific humidity – not relative humidity.
I am assuming the legend in figure 1 refers to relative humidity.

]]> By: samir http://www.electronics-cooling.com/2003/11/the-thermal-conductivity-of-moist-air/comment-page-1/#comment-4930 samir Tue, 21 Jun 2011 10:28:28 +0000 http://www.electronics-cooling.com/?p=278#comment-4930 Can any one help? How i can calculate the thermal conductivity of mix air with water air ratio up to 10% and air temperature up to 1000K. Many thanks Samir Can any one help?
How i can calculate the thermal conductivity of mix air with water air ratio up to 10% and air temperature up to 1000K.
Many thanks
Samir

]]> By: Nelis Mies http://www.electronics-cooling.com/2003/11/the-thermal-conductivity-of-moist-air/comment-page-1/#comment-3197 Nelis Mies Tue, 16 Nov 2010 14:40:35 +0000 http://www.electronics-cooling.com/?p=278#comment-3197 Dear Rex, It appearedd that I posed the same question to the makers of @Air. Here is there answer: Dear Nelis Mies, "Relative humidity measures the amount of water vapor in the air relative to the maximum amount that the air can absorb at a given temperature. Since the boiling point of water is about 100 deg C at atmospheric pressure, air can hold an unlimited amount of water vapor above that temperature and so relative humidity is undefined. You are probably starting with air at some lower temperature and heating it. I suggest that you calculate the humidity ratio in the cooler air using the temperature and relative humidity. Then calculate the properties at higher temperatures using the humidity ratio calculated at the lower temperature. This will work because heating the air does not change the humidity ratio. If you are actually adding moisture to the air, then you must calculate a new humidity ratio and use that value to calculate the properties at the higher temperatures. The program will accept temperatures up to 2000 deg K." Best regards Nelis Dear Rex,

It appearedd that I posed the same question to the makers of @Air.
Here is there answer:

Dear Nelis Mies,
“Relative humidity measures the amount of water vapor in the air relative to the maximum amount that the air can absorb at a given temperature. Since the boiling point of water is about 100 deg C at atmospheric pressure, air can hold an unlimited amount of water vapor above that temperature and so relative humidity is undefined.

You are probably starting with air at some lower temperature and heating it. I suggest that you calculate the humidity ratio in the cooler air using the temperature and relative humidity. Then calculate the properties at higher temperatures using the humidity ratio calculated at the lower temperature. This will work because heating the air does not change the humidity ratio. If you are actually adding moisture to the air, then you must calculate a new humidity ratio and use that value to calculate the properties at the higher temperatures. The program will accept temperatures up to 2000 deg K.”

Best regards

Nelis

]]> By: Rex Breunsbach http://www.electronics-cooling.com/2003/11/the-thermal-conductivity-of-moist-air/comment-page-1/#comment-2424 Rex Breunsbach Thu, 12 Aug 2010 05:28:59 +0000 http://www.electronics-cooling.com/?p=278#comment-2424 Do you have any data for temperaures above 100C? Do you have any data for temperaures above 100C?

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