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  1. #1

    Delta T for Ahu, Chiller and district cooling systems

    Hi all..Can anyone please explain me the concept of delta T & what delta T shall be considered for Chillers, Ahu & district cooling systems?
    And how it shall be calculated and considered?

    Regards

  2. #2
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    Thread relocated to AOP

  3. #3
    Quote Originally Posted by Chris_Worthington View Post
    Thread relocated to AOP
    What is AOP?

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    Quote Originally Posted by mohsinrkhan86 View Post
    What is AOP?
    Ask Our Pros.
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    How many times must one fix something before it is fixed?

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    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

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    Last edited by beenthere; 12-08-2012 at 10:58 AM. Reason: Non Pro * Member

  6. #6
    Quote Originally Posted by Catherin View Post
    District cooling systems can replace any type of air conditioning system, but primarily compete with air-cooled reciprocating chiller systems serving large buildings which consume large amounts of electricity.
    But what are delta T values for different systems to consider?

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    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

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    Last edited by beenthere; 12-08-2012 at 10:59 AM. Reason: Non Pro * Member

  8. #8
    Quote Originally Posted by Catherin View Post
    A delta-T is the change in temperature of a single substance or flow of substance. The evaporator delta-T is the temperature difference between the air entering the coil and the air leaving the coil.
    Yeah i know what delta T is. But i heard that there are pre-specified values of delta T for different types of systems like ahu, chiller etc

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    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

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    Last edited by beenthere; 12-08-2012 at 11:00 AM. Reason: Non Pro * Member

  10. #10
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    Quote Originally Posted by mohsinrkhan86 View Post
    Yeah i know what delta T is. But i heard that there are pre-specified values of delta T for different types of systems like ahu, chiller etc
    Yes, there are specific Delta T parameters that are engineered into any given equipment.

    I've seen reach in coolers designed for 5 degrees delta for a specific purpose. I've seen chillers run from 10 to 20 degrees delta T, as well as air handlers. you will have to research each individual piece of equipment to find what the design Delta T is soposed to be.

    ...Ron
    Roof Rat

  11. #11
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    Catherin, this is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and qualifications here.

    Your post has been deleted.
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  12. #12
    Quote Originally Posted by rscamaro View Post
    Yes, there are specific Delta T parameters that are engineered into any given equipment.

    I've seen reach in coolers designed for 5 degrees delta for a specific purpose. I've seen chillers run from 10 to 20 degrees delta T, as well as air handlers. you will have to research each individual piece of equipment to find what the design Delta T is soposed to be.

    ...Ron
    Thanx rscamaro for your response.
    Another doubt, more the delta T value, better is the system. Is it true?

  13. #13
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    Quote Originally Posted by mohsinrkhan86 View Post
    Thanx rscamaro for your response.
    Another doubt, more the delta T value, better is the system. Is it true?
    Not necessarily.

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