Low Pressure Heat Of Compression Air Dryer.

What is the Air pipe size in [nb]? What is low pressure heat?

Sounds like you need to do more research and/or hire a consultant.

Do you have any consultant, send me a contact detail. I am really interested. Thanks.

I can do this for a proper fee!

My day rate aint cheap!

You might want to get a few proposals in before you decide that I do this!

I take payment in advance as well for unknown customers.

PM me if you need more details!

I think he means mm, not nb (which could be a typographical error). I fail to understand how sub-atmospheric pressure air is being heated? Are you heating the low pressure air to that temperature, THEN compressing?

I'm guessing you want a "low pressure dessicant type air dryer, -40 dew point, using heat of compression to regenerate"????

Just as a reference point, for anyone to do anything with this they will also need to know:

1. what is the desired outlet air temperature.
2. what are the ambient conditions (temperature, humidity)
3. what is the moisture content of the incoming air
4. what is the colour of the inlet pipe
5. out of curiosity, how do you get that temperature with 0.3 to 0.5 barg compression- a figure that would be more normally associated with 10 barg (approx. 150 psi) compressor output range?

So why aren't you ringing the original equipment manufacturer for advice? Sheeeeesh!

JNB hints at what you need to know (although myself I am puzzled why the colour of the inlet pipe is required?). You have given some details but all is needed. ie.

Ambient air (is it?) but definitely inlet air conditions, ie, temperature, pressure and relative humidity (or dewpoint) and flow are required.

And the same for outlet temperature, pressure, dewpoint and flow - and duration of flow (intermittent are continuous).

Keep away from consultants at the moment - a consultant is a person who knows who to consult - and they will charge you a lot for asking the same questions.

From the sparse info given, the solution of your problem points to a desiccant type dryer, that basically becomes one of regenerating the desiccant - maybe using the heat of compression as hinted in the title.

Bah, all you do is to make OP aware of what he needs to tell me so I can do my job!

Cheers for this!

He will still need a consultant unless you want to tell him here and now without payment what he is about to purchase!

The colour of the inlet pipe is EXTREMELY important at this stage. Shhhh!

Ambient air conditions may reflect inlet (to compressor) conditions, but are also required for heat losses- is this located outdoors in Saudi Arabia or outdoors in Norway?

And to be specific, I should have said "sorbtion type" instead of generalizing "dessicant type", as the OP specified alumina balls.

Lastly, I should have said search air dryer manufacturers on IHS!

Thanks for reply. The atmospheric conditions are as follows. Ambient temperature 40 deg. Centigrade. Cooling water temperature 32 degree centigrade. Average humidity 60-80 % Atmospheric air pressure 1013.25 hpa

Thanks for reply . Could anyone suggest me an equation of pressure drop of molecular sieve bed and air contact time with molecular sieve bed according to air flow and size of molecular sieve.

2-3 telephone calls to the vendors might be more help to you than we can be.

Too many unknown variables and too low working pressure is your problem.

Go to a dryer manufacturer and tell them you want air at your stated pressure, temperature, flow and dew-point, (assume 100%RH at inlet to dryer), and get them to quote.

This will give you some idea if it can be done, and if they can do it, they will tell you what the inlet pressure must be (the pressure drop), how much air is needed for purge, and the power for reheat - and a price.