×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Free air cooling

Free air cooling

Free air cooling

(OP)
Hi there i am a newbie to the forum. i have a project in a dairy plant for a evaporator drying plant that requires some cooling to the building that the plant is contained in to leave it comfortable for process workers. I have been supplied with the loads that the plant will generate (total of 254Kw) and the building has a volume of 6350m3, ambient temperature max 25°c and target temperature in the building of max 35°c. My question is how do i work out the require air changes per hour to achieve the cooling required. Thanks and waiting for your help!

RE: Free air cooling

This is not a class in thermodynamic, it is a web forum.

RE: Free air cooling

I agree with Willard - you need to do some legwork yourself if you're ever going to get any traction as an engineer.
As a starting point, you need to look at the enthalpy change from your air intake to your air discharge, this will allow you to work out the AC/h.
You need to know humidity values as well as temperatures, get to know and love your psychrometric charts, this is a great application for their use.

RE: Free air cooling

You need a lot more than a forum can (or should) provide. The 254kW given to you may just be the process power consumption. You still need the building envelope load. Also, I would imagine that the drying process either dumps humidity into the building or exhausts it outside. Either case presents HVAC challenges that you must address. You need to do a complete load of envelop, people, ventilation, and internal process loads. That gives you a starting point of total cooling required.

If worker comfort is the only concern, spot coolers may be an option.

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