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  1. #1
    Join Date
    Dec 2004
    Posts
    46
    I know that as condensing temperatures decrease, system capacity increases. Can anyone tell me what the ratio is? How much capacity increase per degree of condensing temp. decrease? Same question for liquid line subcooling. thanx

  2. #2
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,316
    You should also consider that when condensing temperature is decreased, the power requirement also decrease. Combine this with the increase in capacity and the overall efficiency boost is truly evident. A rough rule of thumb would be around 5% efficiency increase per 10ºF SDT reduction. Study some compressor performance data and figure it out for yourself.

    Liquid subcooling alone while it can give significant increase in refrigerating capacity, it doesn't give the same power reduction as lower head pressure will. Also you'll find that the benefits of liquid subcooling will vary greatly with the refrigerant used.

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