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Thread: Interesting Room Temperature Problem - Is my AHU sufficient?

  1. #1
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    Interesting Room Temperature Problem - Is my AHU sufficient?

    We normally install light commercial systems but have recently been asked to look into a couple of rooms in an industrial building which are not keeping to their designed temperature.

    They run off a Air Handling Unit with a 300kW cooling coil working from an internal air intake of 30°C Summer and 18°C Winter.

    Required Room Specs are:
    Room 1:
    20°C±2°C
    45Pa
    10 Air Changes
    3.22m³/s

    Room 2:
    20°C±2°C
    30Pa
    16 Air Changes
    2.57m³/s

    Basically just want to know if the AHU is sufficient for what is required for each room?

    If anyone can help, I'd appreciate it.

  2. #2
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    Thread Starter

    P.S.

    Quote Originally Posted by Ronnie74 View Post
    We normally install light commercial systems but have recently been asked to look into a couple of rooms in an industrial building which are not keeping to their designed temperature.

    They run off a Air Handling Unit with a 300kW cooling coil working from an internal air intake of 30°C Summer and 18°C Winter.

    Required Room Specs are:
    Room 1:
    20°C±2°C
    45Pa
    10 Air Changes
    3.22m³/s

    Room 2:
    20°C±2°C
    30Pa
    16 Air Changes
    2.57m³/s

    Basically just want to know if the AHU is sufficient for what is required for each room?

    If anyone can help, I'd appreciate it.

    I should also add the following:

    Room 1: Volume - 1350m³ (approx)

    Room 2: Volume - 758.75m³ (approx)

    In addition, although I have not visited site myself, I have been told there are high heat gains from the processes within.

  3. #3
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    Jul 2015
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    Thread Starter

    Drawing

    Please find drawing of the system below:

    Job178.pdf

    Quote Originally Posted by Ronnie74 View Post
    I should also add the following:

    Room 1: Volume - 1350m³ (approx)

    Room 2: Volume - 758.75m³ (approx)

    In addition, although I have not visited site myself, I have been told there are high heat gains from the processes within.

  4. #4
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    Location
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    This belongs in tech to tech, with a callout to those working in Canada or Europe.

    Most US techs are not familiar with your measurments.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  5. #5
    Join Date
    Sep 2006
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    Well first off you need to know how much sensible cooling capacity you need for each room.
    The quantity of air is known, so then you can calculate the supply temp of the air.
    When you know de supply temp, you can calculate the cooling capacity of the AHU (sensible + latent)
    If you dont have enought cooling capacity, i think the best thing to do is add capacity in the room itself, so that you dont have to dehumidify so much air.

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