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[Applied Cryogenics]

 

What is Cryogenic Treatment?

 

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What can you expect?

[Why ACI?]

Why ACI?

 

* Sophisticated vacuum insulated cryoprocessors refined and perfected during the 25+ years we've been offering our equipment for sale.
* Reliability and efficiency are built in. Our first machine is still in service.
* The most efficient machine available.
* Lowest use of liquid nitrogen of any available machine
* Patented heat exchanger technology minimizes thermal stress and shock.
* Totally dry process, no spray bars to spray liquid nitrogen on the payload.
* Heating element allows tempering right in the machine.
* Machines in service world wide.
* Industrial grade microprocessor controls, not unreliable home grade computer control.
* Cylindrical design assures better air flow, more even processing & eliminates hot corners.

Insulation
Vacuum insulation offers the ultimate insulation for cryogenic processing equipment. Because of it, our machines have the lowest usage of liquid nitrogen in the industry. This cuts the cost of processing dramatically. Where machines with ordinary insulation often have to have makeshift fixes such as applying foam to the outside of the machine after several years, our first vacuum insulated machine, built in 1985, is still in use. Because one inch of vacuum insulation provides better insulation than several feet of conventional insulation, our machines are surprisingly compact. The machine does not have or require a vacuum pump.
 

Heat Exchanger Technology
The second thing to look for is a means of cooling the chamber without thermally shocking the parts in the chamber. Our machines use heat exchangers to cool the inside of the chamber by gas kinetics. Nitrogen enters the heat exchanger and a fan circulates air over it. This gently reduces the temperature within the chamber and at the same time provides air circulation within the round chamber so the temperature remains even. In our machines, Liquid Nitrogen is never brought in contact with the material. This ensures that the treated material is at no time subjected to thermal shock.

 

Some machines inject or spray liquid nitrogen into the chamber and others introduce it into a false floor. The question of spraying nitrogen into a chamber and hoping it evaporates before it hits a warm part is based on faith. A small change in nitrogen pressure or a

clogged or worn nozzle is all it would take to have nitrogen spray directly on an expensive engine block or die, thermally shocking the part. We have direct knowledge of this happening in spray bar equipped machines. The results were damage to the parts being treated.

Introducing the cold to the bottom of the chamber defies logic. Cold goes down, so it is more logical to introduce the cold to the top of the machine. By the way, some of our competitors claim to be able to control the temperature within the chamber to a hundredth of a degree. Since they are using thermocouples like everybody else, this is nonsense, as air within the machine will vary by more than that over the length of the thermocouple. The fact is that such precision is unnecessary to achieve perfect results.

 

Careful Attention to Heat Flow into the Chamber
Our careful design reduces the heat flow areas to a minimum. The cylindrical design reduces the overall sealing area for the top, which keeps cold loss through the interface between the lid and the machine to an absolute minimum. This assures minimum nitrogen consumption. There are no corners where heat flux will be higher due to greater surface area on the outside. There is a minimum of conductive heat paths within the chamber, as the inside of the chamber hangs within the outside. This also eliminates the tendency of square machines to buckle as they try to accommodate the difference in thermal contraction between the inside and the outside of the machine. One of our competitor's machines buckles so much that the doors crack open and the machine never really gets down all the way to -300F, nor can it get up to its rated +300F tempering temperature.

Heating Capabilities Within the Machine
Applied Cryogenics machines are designed with heating elements so that the load can be tempered within the machine up to +300F. Having this capability gives the machine user better flexibility in running parts. Also, due to the extraordinary efficiency of the vacuum insulation, these heating elements are often necessary to allow the temperature of the payload to be brought up to room temperature within a reasonable time.
 

 

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