INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Building the ultimate dryer

Building the ultimate dryer

(OP)

I'd like to build a custom dryer for taking high moisture content food scraps, using as little energy as possible. I realize that this is a subject that many have tackled, and with concrete efficiency limits. A nudge to any resources devoted specifically to this, or any corrections you could make to my understanding of the relevant systems, materials, equations, or other ideas would be hugely helpful.

My understanding is that the 'best' system will strike a balance between continuously supplying dry air ad removing moisture saturated air while efficiently maintaining the interior temperature. Moisture removal via condensation, ventilation, heating all consume energy. Efficiency can be maintained by using well insulated materials and minimizing interior volume, but only to an extent. If somebody could tell me the equations governing each of these aspects, so that I can optimize them and plug in renewable technologies where possible, it would help out enormously. There are a couple of other interesting caviates that could generate some ideas:

1. A solar thermal system is being considered for heating coils and exchanging energy with fluids such as glycol.
2. This will be located up North (NJ), and it would be possible to incorporate passive air condensation during winter if the heat loss does not make this a lousy idea.
3. I've heard of enthalpy recapture and other techniques for drying things efficiently while preserving energy, are their any other tools you might recommend plugging in?

Relevant details:
1. Moisture Content in - 40 -60 percent
2. Moisture content out - 10 - 20 percent
3. Surrounding air can be assumed to be 70 degrees, outside of the dryer.

I greatly apprecite the help, as I am an environmental engineer and not a HVAC specialist.

RE: Building the ultimate dryer

Batch or continuous?

How much?

RE: Building the ultimate dryer

(OP)
Batch is more likely, in terms of tonnage, 6-12 would be ideal (of incoming mass).

RE: Building the ultimate dryer

(.4-.2)*6 = 1.2
(.6-.1)*12 = 6

Huge difference in capacity for a single machine.

If you are using free energy (i.e. solar), why worry about using as little energy as possible?

RE: Building the ultimate dryer

Erik-V ,
Look to the feed milling and processed foods industry , Particularly Grain dryers, and pellet dryers . They have been solving this problem for the last 100 years.
Suggested companies; California Pellet mill Co, GSI, Brock, https://www.potatopro.com/product-types/industrial...
B.E.

You are judged not by what you know, but by what you can do.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close