1. Not finding help here? Sign up for a free 30min 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!

Heat Pumps

  1. Apr 19, 2009 #1
    1. The problem statement, all variables and given/known data
    The question asks us to advise the company on a heat pump (and give reasons) which is claimed to deliver 1500J to a room at 280K by consuming 50J of work per cycle pumping heat from the surroundings at 270K.
    I've drawn a diagram of the heat pump, taking heat Q2 from a bath of 270K up to an engine/refrigerator into which goes work W=50J, from which heat Q1 goes into hot bath of 280K. I am a bit confused about what to do next.
    Is it that the efficiency of a heat pump is = Q1/W = Q1/ (Q1-Q2) = ????

    thanks


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 20, 2009 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    It's actually referred to as "coefficient of performance" or COP, but yes that is the right idea.

    Compare the claimed COP with what you'd get for a Carnot Cycle heat pump operating at those temperatures, to determine whether this COP is possible.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Heat Pumps
  1. Heat Pumps (Replies: 2)

  2. Heat pumps (Replies: 0)

Loading...