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

Refrigeration - Fouling in the sizing evaporator and condenser

  1. Mar 1, 2010 #1

    I am trying to determine the importantance and difference of fouling in sizing the evaporator and condenser in a Refrigeration cycle?


  2. jcsd
  3. Mar 4, 2010 #2
    I got this from the ASHREA Handbook:

    Fouling, an accumulation of dust or condensates on heat exchanger
    surfaces, reduces heat exchanger performance by increasing
    resistance to airflow, interfering with mass transfer, and generally decreasing
    heat transfer coefficients. Increased resistance to airflow increases
    fan power requirements and may reduce airflow.
    Increased pressure drop across the heat exchanger core can indicate
    fouling and, with experience, may be used to establish cleaning
    schedules. Reduced mass transfer performance (latent effectiveness)
    indicates fouling of permeable membranes or desiccant sorption
    sites. Heat exchanger surfaces must be kept clean to maximize
    system performance.​
    2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition).

    In terms of sizing the Evaporator and Condenser, fouling doesn't need to be taken into consideration, rather it is more important to know that it is there and will eventually cause degradation in performance.

    To reduce fouling you can use a filter.

    I hope that helps.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook