Best Lab Equipment

Here are some more information for Temperature Forcing:

Super High Temperature Blowers, Fans, Ventilators

A new design of high temperature fans and blowers for operating up to 2,200 F is introduced by Tenderall Blower Co. which has increased again the operating temperature limit of its unique line of super high temperature fans and blowers for industrial applications to 2200 F. This was achived by using extremely high strength stainless steel alloys for the fans impellers, that allow for higher safe speeds at elevated temperatures. High temperature exotic ceramics are also used for ventilator impellers.

The Tenderall high temperature oven fans line now include:

- Pre-engineered and custom made fans for all types of applications with vaiety of impeller types and accessories;
- Operating up to 2200 F, centrifugal, axial and plug fan types;
- Canada Blower engineers provide a professional advice and recommend a right fan for every application & oven / plenum design;
- Unique high temperature water-cooled motors for operation up to 2300 F:
- The fan offering provides competitive replacement fans to Garden City, Lau, IGE, Alloy Fabricating fan models; repairs, re-build & balancing.

There are two major types of Tenderall high temperature fans - axial and centrifugal:

Axial Blade Fans:

    * The axial blade wheel is usually specified where there is a need for very large volumes of air flows against low static pressure.   Axial wheel like the multi-blade forward curve type wheel could cause an axial fan to deliver different air volumes at the same static pressure, if the total pressure requirement of the fan system was underestimated. This type of fan is ideally suited where a large volume of flow is required with a minimum of duct work and is used extensively for small and large furnaces, such as aluminum annealing.

Centrifugal Fan:

    * Radial Blade, paddle wheel type fans.  This type of wheel is usually specified where there is a necessity for medium volumes of flow against medium to large static pressures. The paddle wheel is considered a self cleaning type of wheel.  It could be used where there are various materials or dust in the air stream.  Due to its structurally strong design, it is used in many heat treatment applications at very high temperatures where maximum fan longevity is desired.
    * Multiblade forward curve wheel.  This type of wheel is usually specified where there is a necessity for large volumes of flow against low to medium static pressure requirements.  The forward curve blade is that it delivers the same volume of air as either the backward or radial blade wheel, at a lower fan speed, which is important due to wheel stresses at elevated temperatures.  This fan is the most common type used in all types of heat treatment operations except where a buildup of material on the blades could occur, as wheel unbalance would result.

High temperature centrifugal fans are available in both housed free-standing fan configuration and in non-housed plug fan / air-kit design. High temperature axial plug fans can be unhoused plug fans with or without fan shroud / diffuser, or in tubeaxial / vaneaxial configuration with forced air belt tunnel colling cooling system by auxiliary cooling blower.

For additional information please refer to http://www.tenderall.com/index.html.

O. Chetchel
Design Engineer
Tenderall Blower Co.
http://www.tenderall.com
http://www.tenderall.com/blower/index.html

About the Author

Oleg Chetchel
Ventilation Equipment Designer
Tenderall Fan Co.
http://tenderall.com

Why does Hydrogen iodide have a higher boiling temperature than hydrogen chloride?

I thought becuase chlorine is more electronegative than iodine, there is more attractive force between the chlorine and hydrogen and therefore the bonds are harder to break.
But hydrogen iodide has a boiling temperature of -35of
Whilst hydrogen chlorine has a boiling temperature of -85
Also chlorine is smaller than iodine so it has a bigger charge density doesnt it?

It somewhat has a bit to do with electronegativity. Electronegativity is the ability of a bonded atom to gain a pair of electrons in a covalent bond; however is not explained in this term.
-as you move down the periodic table for the halogens, they become less reactive and have higher boiling points(makes sense doesn't it? if they are less reactive, it must therefore be less easier to break their bonds, thus higher boiling points down the group).
-i.e Br is less reactive than Cl, I is less reactive than Br and so on
thus if I is less reactive than Br, surely it must be also less reactive than Cl as well.
Why is I less reactive than Cl?
Because I has more electrons than Cl(look at the atomic number which is the the top number besides each element in the periodic table, you will see that Iodine has a greater atomic number than Chlorine. Atomic number is the number of protons. It's also the number of electron in neutral atoms, which is what we're talking about now.
So being as there is an increase in the number of electrons down the halogen group, there is correspondingly an increase in van der waal's forces holding the atoms in the molecule together down the halogen group{this is the answer to your question}.

Faith in global warming wanes
STATE COLLEGE, Pa. - The violent threats are not what bother Michael Mann the most. He's used to them.

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