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How is Efficiency of Heat Exchangers (HRV) determined

  1. May 26, 2014 #1
    I've be looking at the specs for Heat Recovery Ventilators (HRV).

    They commonly state that they can recover 85% of the heat. How is that possible? To me you could only every recover 50% in a perfect situation because of the equal volume of airflow's. Won't the air temperatures just stop at equilibrium?
     
  2. jcsd
  3. May 26, 2014 #2

    AlephZero

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  4. May 26, 2014 #3
    Commercially designed heat exchangers must be designed with a fairly strict operating (especially ambient environmental) temperature window in mind to keep to high levels of efficiency. The common household so-called "heat pump" systems efficiency drops precipitously below 45 F (7.2C) for example.
     
  5. May 27, 2014 #4
    Thanks a lot Aleph you answered my question, that wiki was helpful.
     
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