What parameters would you examine in point 3 to obtain the psychrometric properties if it's based on actual conditions without assuming 100% relative humidity?
Level 1 answer: Measure one more thing, e.g. the temperature in flow 3 Level 2 answer: In a real system, the dryer is never fully adiabatic, so measure both temperature and wet temperature in flow 3. Level 3 answer: In a real system you typically want your drying goods to become dry, right? So the underlying assumption that the drying goods is surface wet is violated and the air in the dryer will not follow the adiabatic cooling line and thus you definitely need to measure both the temperature and the wet temperature in flow 3. Compare the video on drying rate: czcams.com/video/Nxw6RepXwww/video.html
@@PLE_LU Thank you for your quick response. Btw, I’m currently designing a dryer for my undergraduate thesis and there’s no possible way to measure the temperature at point 3. What should I do to determine the properties at point 3?
A Mollier diagram for moist air. There are two competing conventions regarding in which direction to draw the axes, if that's what you're asking. If you're asking who wrote the code for drawing this particular copy of this variant of a Mollier diagram, the simple answer is: I did.
Please note that much of the video is black text on white background. White background is the brightest video you can get, so if the video is not bright on your end, my guess is that there is some issue with the device you are using
Perhaps it will help you to watch the initial videos in the playlist on moist air and drying, czcams.com/play/PLvpgTFzUKO48nlnRWhkT_c0nmXOtYZA5D.html, where I explain the Mollier diagram and how it works?
This one video in a series of videos. In this video we make the simplification that the relative humidity is 100% in the outgoing air, and thus that Tair=Twet in the outgoing air. If you watch the other videos in the playlist on moist air and drying, czcams.com/play/PLvpgTFzUKO48nlnRWhkT_c0nmXOtYZA5D.html, you will see that it is not possible to reach 100% relative humidity.
Thanks for the hint, but you are actually incorrect. The probably most common engineering way to express this is still _moist_ air, see e.g. www.engineeringtoolbox.com/moist-air-properties-d_1256.html So, in engineering we talk about moist air versus dry air. Moisture content = kg water/kg dry air, Relative humidity compares the humidity with the moisture content at saturation. How much the terminology varies between countries is beyond my knowledge, but moist air is definitely commonly used in engineering contexts.
Sir, very exllant presentation along with useful formula and calculations.
Well explained with examples. informative
Superb ! Thanks.
What parameters would you examine in point 3 to obtain the psychrometric properties if it's based on actual conditions without assuming 100% relative humidity?
Level 1 answer: Measure one more thing, e.g. the temperature in flow 3
Level 2 answer: In a real system, the dryer is never fully adiabatic, so measure both temperature and wet temperature in flow 3.
Level 3 answer: In a real system you typically want your drying goods to become dry, right? So the underlying assumption that the drying goods is surface wet is violated and the air in the dryer will not follow the adiabatic cooling line and thus you definitely need to measure both the temperature and the wet temperature in flow 3. Compare the video on drying rate: czcams.com/video/Nxw6RepXwww/video.html
@@PLE_LU Thank you for your quick response. Btw, I’m currently designing a dryer for my undergraduate thesis and there’s no possible way to measure the temperature at point 3. What should I do to determine the properties at point 3?
Nice video
Let me ask sir
What chart did you use?
A Mollier diagram for moist air. There are two competing conventions regarding in which direction to draw the axes, if that's what you're asking.
If you're asking who wrote the code for drawing this particular copy of this variant of a Mollier diagram, the simple answer is: I did.
You try to give the video more brightness it will be great if you do
Please note that much of the video is black text on white background. White background is the brightest video you can get, so if the video is not bright on your end, my guess is that there is some issue with the device you are using
Could you please explain how you read H1, H2, and H3?
Perhaps it will help you to watch the initial videos in the playlist on moist air and drying, czcams.com/play/PLvpgTFzUKO48nlnRWhkT_c0nmXOtYZA5D.html, where I explain the Mollier diagram and how it works?
In that condition what Will be exit air temp and wet bulb temp???
Both can be equal if yes how is it possible please explain
This one video in a series of videos. In this video we make the simplification that the relative humidity is 100% in the outgoing air, and thus that Tair=Twet in the outgoing air.
If you watch the other videos in the playlist on moist air and drying, czcams.com/play/PLvpgTFzUKO48nlnRWhkT_c0nmXOtYZA5D.html, you will see that it is not possible to reach 100% relative humidity.
why my lecture explanation not simple like this
This is lovely, but there's one thing I have to tell you:
Only Swedes would ever talk about "moist air"... 😏 The term in English is "humid air"!
Thanks for the hint, but you are actually incorrect. The probably most common engineering way to express this is still _moist_ air, see e.g. www.engineeringtoolbox.com/moist-air-properties-d_1256.html
So, in engineering we talk about moist air versus dry air. Moisture content = kg water/kg dry air, Relative humidity compares the humidity with the moisture content at saturation.
How much the terminology varies between countries is beyond my knowledge, but moist air is definitely commonly used in engineering contexts.