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Finally, the penny drops!

In the last forty years the structure of even the simplest zeolite (A) has been investigated and
its uses as? adsorption and catalytic surfaces has been investigated.

Here is a straightforward paper on the topic


Recently people have been interested in zeolites as heat exchangers.
This is a demo model of the kind I expect that triggered this thread.

Zeolite (etymology "boiling rock", for its exothermal behavior in adsorbing up to 30% by weight of water) is an interesting material.
Zeolites are ideally heated to 250degC to desorb the attached water again.
But lower temps can release a fair proportion of the water.

Now having got those facts out of the way, its time to mention something else interesting:?? If a dry zeolite is pumped down in the presence of water vapor,
the zeolite will self-pump down further.

An attractive primitive pump down method presents itself: given
a side water reservoir and an air reservoir connected with taps, the classical method of steaming out the air reservoir and chilling it down with waste water, then connecting to the chiller system, several times will pull the chiller pressure down enough for the zeolite to work its magic, given three gas taps are plumbed in to give the desired evacuation sequence.

A suitable scavenged container might be provided by a used propane cylinder or two, which can take the vacuum easily.

Brian Whatcott
Altus Oklahoma

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S, brian whatcott pi?e:

Finally, the penny drops!

In the last forty years the structure of even the simplest zeolite (A) has been investigated and
its uses as? adsorption and catalytic surfaces has been investigated.

Here is a straightforward paper on the topic


Recently people have been interested in zeolites as heat exchangers.
This is a demo model of the kind I expect that triggered this thread.

Not exactly this research post but is the same stuff.

Zeolite (etymology "boiling rock", for its exothermal behavior in adsorbing up to 30% by weight of water) is an interesting material.
Zeolites are ideally heated to 250degC to desorb the attached water again.
But lower temps can release a fair proportion of the water.

Now having got those facts out of the way, its time to mention something else interesting:?? If a dry zeolite is pumped down in the presence of water vapor,
the zeolite will self-pump down further.

I see that behaviour as when I stop pumping the pressure goes down even without pump. Not far but it's goes down.

An attractive primitive pump down method presents itself: given
a side water reservoir and an air reservoir connected with taps, the classical method of steaming out the air reservoir and chilling it down with waste water, then connecting to the chiller system, several times will pull the chiller pressure down enough for the zeolite to work its magic, given three gas taps are plumbed in to give the desired evacuation sequence.

Hmm.. I don't understand that. Can you explain more precisely? (Probably the reason is only my bad english, and fact that I'm electronic man and my knowledge is slick in vaccum)


Slavko.

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On 6/9/2011 12:45 PM, Slavko Kocjancic wrote:

?

An attractive primitive pump down method presents itself: given
a side water reservoir and an air reservoir connected with taps, the classical method of steaming out the air reservoir and chilling it down with waste water, then connecting to the chiller system, several times will pull the chiller pressure down enough for the zeolite to work its magic, given three gas taps are plumbed in to give the desired evacuation sequence.

Hmm.. I don't understand that. Can you explain more precisely? (Probably the reason is only my bad english, and fact that I'm electronic man and my knowledge is slick in vaccum)


Slavko.

Fill a tank with steam.
Close the tank off and chill it to ambient - open a valve to the system to pump down.
Repeat ten or more times, with a good size tank.

Brian W

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S, brian whatcott pi?e:

On 6/9/2011 12:45 PM, Slavko Kocjancic wrote:

?

An attractive primitive pump down method presents itself: given
a side water reservoir and an air reservoir connected with taps, the classical method of steaming out the air reservoir and chilling it down with waste water, then connecting to the chiller system, several times will pull the chiller pressure down enough for the zeolite to work its magic, given three gas taps are plumbed in to give the desired evacuation sequence.

Hmm.. I don't understand that. Can you explain more precisely? (Probably the reason is only my bad english, and fact that I'm electronic man and my knowledge is slick in vaccum)


Slavko.

Fill a tank with steam.
Close the tank off and chill it to ambient - open a valve to the system to pump down.
Repeat ten or more times, with a good size tank.

Brian W

Ahh I understand. But afraid that this will saturate zeolite quick. I will try to make hand pump like described in patent here.

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On 6/10/2011 1:37 AM, Slavko Kocjancic wrote:

S, brian whatcott pi?e:

On 6/9/2011 12:45 PM, Slavko Kocjancic wrote:

?

An attractive primitive pump down method presents itself: given
a side water reservoir and an air reservoir connected with taps, the classical method of steaming out the air reservoir and chilling it down with waste water, then connecting to the chiller system, several times will pull the chiller pressure down enough for the zeolite to work its magic, given three gas taps are plumbed in to give the desired evacuation sequence.

Hmm.. I don't understand that. Can you explain more precisely? (Probably the reason is only my bad english, and fact that I'm electronic man and my knowledge is slick in vaccum)


Slavko.

Fill a tank with steam.
Close the tank off and chill it to ambient - open a valve to the system to pump down.
Repeat ten or more times, with a good size tank.

Brian W

Ahh I understand. But afraid that this will saturate zeolite quick. I will try to make hand pump like described in patent here.

It really would help if you were not so convinced the other guy is wrong.
This is called the "physics undergrad effect."

OF COURSE you isolate the water /pump arrangement from the main? cooler circuit.
Forget a hand pump. This is simple and effective - all it takes is time.

Brian W

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S, brian whatcott pi?e:

It really would help if you were not so convinced the other guy is wrong.
This is called the "physics undergrad effect."

I do wrong decissions's too.

OF COURSE you isolate the water /pump arrangement from the main? cooler circuit.
Forget a hand pump. This is simple and effective - all it takes is time.

I'm not shure I understand you right. I have 1l evaporator already filled with watter. It's near full. Then I have sorber (the zeolite container) with aprox 5l voids. and I have one hose connecting them. So the hose and evaporator has total 1dl air needed to evacuate. But the sorber has the greatest volume and any water vapour here just decrease cooling capability.