×
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

How to estimate the heat generated from the wash station?

How to estimate the heat generated from the wash station?

How to estimate the heat generated from the wash station?

(OP)
I am working on a project, and need to estimate how much heat is generated from the wash station using hot water spray at 100 F. The overall flow of the hot water spray is 5 gpm. If the wash station is exhausted at 3 cfm/sq ft, do I still need to cool the space? The wash station is enclosed in an air-conditioned space and very little cooling load from lighting and people. Thanks for help!

RE: How to estimate the heat generated from the wash station?

I am not 100% sure what "Wash station" refers to. But from a general approach, I would say...
You need to provide enough air (either make-up or transfer) to balance the air being exhausted. Most likely the wash station is designed to be NEGATIVELY pressurized to keep fumes and oder from escaping the area. Therefore, the exhaust air CFM will be more than the supply, makeup air or any transfer air CFM in that space. The CFM amount depends on your assumptions and/or design criterions.

This is my general understanding of the situation...Hope it a start in the right direction for you.

LSA

RE: How to estimate the heat generated from the wash station?

(OP)
Thanks,LSAxDesigner. It is good point to provide negative pressure at the wash booth. What I am trying to figure out is how much cooling the wash booth needs to keep it at 75 deg F. I came up the formular: total cooling load in Btu/hr = 10 gpm (total hot water flow through spray nuzzlers) * 500 * 25(temperature difference between the hot water and wash booth)=125,000 Btu/hr. I would like to hear second opinion. Thanks again!

RE: How to estimate the heat generated from the wash station?

If I understand correctly, the majority of water should be going down the drain.  Hence your delta T would be the temperature of water coming into the wash station minus the temperature of the water going down the drain.  You could assume that the air leaving the station will be leaving with an RH of 100%.  Calculate the mass of water evaporating and the enthalpy of vaporization and see if it has an affect worth dealing with.  Assume that the wetted portion of the station will have a temp slightly less than the water temp. Look at the heat gain from the wetted surfaces.   Decide what is important and make an energy balance for the station.  At this point you should have a good idea as to the amount of heat gain in the space.  

What is the temperature of the space directly outside of the wash station?
Can you use transfer air and accept a slightly higher temp in the wash station than in the adjacent space?  If you position a transfer air duct to impinge on the wash station operator and then exhaust it above the area that creates most of the heat gain, it might be acceptable solution.

RE: How to estimate the heat generated from the wash station?

(OP)
Thanks, CRG. The space directly outside of the wash booth is air-conditioned and is at 75 F.

RE: How to estimate the heat generated from the wash station?

(OP)
It shall be OK to provide exhaust in the wash booth, and transfer the conditioned air through transfer grille at wall.

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