×
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

heat temperature require to generate ammonia refrigeration

heat temperature require to generate ammonia refrigeration

heat temperature require to generate ammonia refrigeration

(OP)
what is the heat temperature requir to generate the ammonia refregiration cooling system to work, like the one that work on propane.
Joe

RE: heat temperature require to generate ammonia refrigeration

I think he means ammonia absorption refrigeration, in which the ammonia is regenerated by heat, a propane flame in caravan fridges.

http://en.wikipedia.org/wiki/Absorption_refrigeration

I think it's about 120 degC, but I'm sure someone who knows about it will be along shortly with the right figures.

RE: heat temperature require to generate ammonia refrigeration

As a quick answer: It will work where generator temperatures are greater than ambient (WB, if evap cooling is employed) by any amount greater than the difference between Ambient DB and the refrigeration Evaporating Temperature....

That is a quick calc and will leave some portion of the system working at a subatmospheric pressure, which of course leads to some terrible heat transfer conditions, thus a very large condensing heat exchanger, if the heat rejection for the "weak" vapor is to the ambient.

The "weak" condenser will obviously be at positive pressure for PP-Equivalent condensing above 100 Deg. C.

With a lot of waste heat and a ready source of cooling water, they can be made to work at 130 Deg. C. waste heat temperature.

Economical?  Scale will be a very large player in one designed for 130 Heat Source, and its still not going to be a very flexible system, would need a lot of controls.





RE: heat temperature require to generate ammonia refrigeration

If you want some empirical data look at the Yazaki web site, look under hot water fired chillers.  It will give you a range of incoming water temperatures for the chilled water loop, the heat rejection loop, and the heat input loop.

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