Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cooler air with colder water?

  1. May 28, 2008 #1
    If a cooling element in an air unit was designed for water temperatures of 7C in and 12C out, how much "better" will it become if it recieves water at 2C ? Let's say the return is then 7C, will the effect then be the same since the delta T is the same as it was with 7/12 ? It just seems so logical to me that bringing colder water in will result in cooler air...
     
  2. jcsd
  3. May 28, 2008 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Correct, although you won't get quite 5C colder air, the greater water-air temperature difference will cause more heat to flow but it will also increase the effects of anny thermal resistance.
     
  4. May 28, 2008 #3

    russ_watters

    User Avatar

    Staff: Mentor

    This is called improving your "approach temperature". A bigger approach temperature will improve heat transfer and therefore you will pull more energy out of the air. So the delta T will go from, say, 5 C to 6C and you'll get perhaps 8 C return water. Of course, the approach temperature of the chiller that is making that water gets worse when you do that...
     
  5. May 29, 2008 #4
    Thx guys, just one more thing; if this will indeed make the air cooler, how can I calculate the total effect in Watts?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Cooler air with colder water?
  1. Water from air : ) (Replies: 33)

  2. Water air pumps? (Replies: 175)

Loading...