Dear sir,

The intake condition of your blower is pressure=???, Temperature=???, RH=80%

The outlet condition of your blower is pressure=??????, Temperature=?????, RH=?? And should be RH=?

The wanted RH at what conditions is not mentioned.

Cooling driers, which are the most common, dry the air to a certain dew point (mostly 3 degrC).

Drying the air by cooling is best done at the outlet side of the blower, as the compression has a drying effect already and the volume is smaller.

Have a look at some websites of well known compressor manufacturers.

If you mention the above mentioned data, I can calculate the conditions and resulting RH values and amount of condensation.

As a cooler has to be purchased anyway, a cooler calculation is unnecessary.

Have a nice day

Teus ■

Hello there,

Xchanger out of Minnesota makes all sorts of after coolers and dehumidifiers for blowers. Please make sure to have the information handy that Teus made mention of before you contact them. If you have steam handy you could artificially heat the air after coming out of the dehumidifier and therfore reduce the RH even more. Do you have chilled water handy for the dehumidifier? That would be the most effective version compared to regular cooling tower water.

http://www.xchanger.com/productstv.htm

I have worked on dehumidifying requests where the inlet air was to be cooled and dehumidified with a dessicant dryer. Munters makes devices like it, but these units get very large and costly.

http://www.munters.us/en/us/Division...umidification/

Good luck,

Ralf ■

Dear LF Pumping Dryer,

This is an ordinary drying task, for which many solutions are available from f.i. Atlas Copco.

An example, based on your indications could be:

A cooling dryer after the outlet of the blower, cooling the air down to 3 degrC at 1.75 bar(abs) (10.7 psig).

Then the RH=100% after cooling.

Reheating the air to 30 degrC, results in a RH=17.5%

Regenerative adsorption dryers are also possible to get even drier air.

A simple job.

If this:

http://www.lfpumping.com/Lf%20Pumpin...20Brochure.pdf

is your website, I noticed that you can also dry cement.

Have a nice day

Teus ■

Dear LF Pumping Dryer,

An example, based on your indications could be:

A cooling dryer before the intlet of the blower, cooling the air down to 3 degrC at 1.0 bar(abs) (0 psig).

Then the RH=100% after cooling.

Reheating the air to 30 degrC, results in a RH=17.2%

After compression to 1.75 bar(abs) (10.7 psig), at a temperature of 30 degrC the RH=30.6%

In this case, the volume to be cooled is more than it would be when cooled after the outlet.

I have worked in cement for 19 years and the only wet cement I have seen could not be dried and turned into concrete right away in an exothermal chemical reaction.

I must admit that we never tried to dry the wet cement.

Best regards

Teus ■

Hey I know a guy who works with roots air blowers and other air blowers

check out his website roots blowers chicago ■

Originally Posted by LF Pumping Dryer

I am looking for a dehumidifier for a roots blower system. The roots blower runs around 6000 cfm. The system could have an intake of air at around 80% humidity, and we are looking to control this humidity to bring it down to an absolutle minimum. The above 80% is very much the extreme.

You can get the required roots blower from Acme Air Equipments as they are leading manufacturer & exporters of roots blowers worldwide. Good luck. . . ■

Originally Posted by LF Pumping Dryer

as the lamiflo drying units can be used all around the world the humidity in take is various.

the psi of the roots blower again is variable from 5 psi to 10psi.

We are looking to control and fix the outlet rh, to a constant, no matter what the intake rh.

so if the acceptable limit on the rh outlet is say 50% from whatever intake rh, from anywhere in the world then we will use this as the base, if we can get down to 10% great.

our units, one month they could be in UK, next month in Thailand.

Dear Richard!

I have tried to contact your company via corporate website re your product, but never got any feedback.

Is it possible to arrange for life enquiry as to your products feasibility?

Thank you very much

zillishine@gmail.com ■

Dear LF pump!

Please contact me to discuss possible cooperation.

Efforts to reach you through the website seems useless.

zillishine@gmail.com ■

Originally Posted by Teus Tuinenburg

Dear LF Pumping Dryer,

This is an ordinary drying task, for which many solutions are available from f.i. Atlas Copco.

An example, based on your indications could be:

A cooling dryer after the outlet of the blower, cooling the air down to 3 degrC at 1.75 bar(abs) (10.7 psig).

Then the RH=100% after cooling.

Reheating the air to 30 degrC, results in a RH=17.5%

Regenerative adsorption dryers are also possible to get even drier air.

A simple job.

If this:

http://www.lfpumping.com/Lf%20Pumpin...20Brochure.pdf

is your website, I noticed that you can also dry cement.

Have a nice day

Teus

Hello Teus,

A question regarding your comment above, you mentioned that putting the dehumidifier after the blower, but in this case, lets say ambient temp. is 20 C, the blower outlet temperature will be about 80 C , so you are suggesting to cool it down from 80 C to 3 C for moisture removal, and then heat again. Isnt this solution wastes huge amount of energy (cooling from 80 to 3 C) ? Isnt that it is better put the dehumidifier before the blower, not after the blower ? Thanks ■

Dear merihakca,

Let us look at the difference in drying in the 2 cases.

Ambient:

20 degrC

RH=80 % (water content = 0.01174852 kg H2O vapor per kg dry air)

After cooling to a dew point of 3 degr., there is condensated 0.00706405 kg water per kg of dry air.

Now we heat the ambient air by compression with a roots blower to 80 degrC.

This 80 degr.C is reached at a pressure of approx. 0.7 barg (1.7 bara)

After compression:

80 degrC

RH=4.9 % (water content = 0.01174852 kg H2O vapor per kg dry air)

Dew point 25.13 degrC

No condensation.

Then we cool this compressed air down to a dew point of 3 degrC

After cooling to a dew point of 3 degr., there is condensated 0.00900147 kg water per kg of dry air.

RH=100 % (water content = 0.00274703 kg H2O vapor per kg dry air)

Dew point 3 degrC

By cooling after the PD blower, the extra amount of H2O vapor that is condensed is:

0.00900147 – 0.00706405 = 0.00193742 (approx. 27.4 % more)

This is caused by the influence of the pressure on the Relative Humidity.

If you want to warm up the air again (which is normally not necessary ) you can use the cooled heat from the refrigerant dryer or let the ambient warm the air or use the stored heat from the material that is pneumatically conveyed.

The latter 2 options do not cost any energy.

Have a nice day ■