Condensation heat transfer and convective heat transfer -1
It is often said that steam is the best heat source for indirect heating which heats object via heating medium. There are other mediums of indirect heating such as oil and hot water.
Compering with other mediums of indirect heating, steam is better in the following two points.
There is of course a reason that steam can heat objects uniformly and rapidly, and the key word is “condensation”.
First, what is “condensation”.
It is one of phase transitions and a transition from gaseous to liquid. When saturated steam is condensed, it turned to saturated water. This moment is the key of indirect heating with steam.
The following is specific example of how the heat is transferred.
Please see the details of steam drying in this page.
Also by clicking diagram, you can jump to steam drying page.
Latent heat utilization
The heat capacity of the latent heat of the steam is about 2-5 times as large as that one of oil or hot water.
Temperature is adjusted to the desired level by changing pressure.
Temperature of the dryer can be adjusted to the desired level by changing steam pressure.
Comparison with hot air drying
There is less damage on the dryer body because of the low temperature.
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