1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculating temperature change

  1. Nov 29, 2008 #1
    Hello to all,

    I'm reading one article about boiler. I have found one interesting fact about air preheater used in industrial boiler. It goes something like this "Approximately 1% of fuel is saved for each 40 F rise in combustion air temperature.

    Now, since I'm in Europe, I want to know how much this is in deg Celsius.
    Just want confirmation about this:
    since Tc = 5*(Tf-32)/9, this will be Tc2 = 5*(Tf1+40-32)/9.
    This will lead to: Tc2-Tc1 = 40/9 +160/9 = 200/9 = 22.2 C
    Is this correct?
  2. jcsd
  3. Nov 29, 2008 #2


    User Avatar

    Staff: Mentor

    Yes, though since you are just doing delta-T's, you don't need to attach them to their respective scales to do the math. Just multiply or divide by the ratio: 40/1.8=22.2
  4. Nov 29, 2008 #3
    OK, thanks
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook