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  1. #1

    Confused what are the factors considered while calculating dehumidication???

    I am having a ducted split unit of 11 TR. I have already done the cooling load calculations for my room but now I have to calculat the dehumidifier capacity as per requirement. The factors I am considering in calculations are:

    1. Infiltration load
    2. human load
    3. ventilation load(fresh air ventilation load and door opening load)

    are there any other factors that I should consider while calculating the dehumidifier capacity??

    Infiltration load=humidity diff. b/w outside and inside *density of air * space volume * some factor

    Human load=no. of people * factor

    Ventilation load= fresh air load + door opening load

    fresh air load=fresh air quantity * humidity diff. * density

    door opening load=area of door* time(sec)door staying open * no. of openings

    Any remarks plz reply.

    ty

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,637
    Quote Originally Posted by manjeet singh View Post
    I am having a ducted split unit of 11 TR. I have already done the cooling load calculations for my room but now I have to calculat the dehumidifier capacity as per requirement. The factors I am considering in calculations are:

    1. Infiltration load
    2. human load
    3. ventilation load(fresh air ventilation load and door opening load)

    are there any other factors that I should consider while calculating the dehumidifier capacity??

    Infiltration load=humidity diff. b/w outside and inside *density of air * space volume * some factor

    Human load=no. of people * factor

    Ventilation load= fresh air load + door opening load

    fresh air load=fresh air quantity * humidity diff. * density

    door opening load=area of door* time(sec)door staying open * no. of openings

    Any remarks plz reply.

    ty
    Consider the building materials ability to allow moisture diffusion from oustide. Also consider the internal moisture load from activities.
    The a/c is able to provide dehumidification only when there is sensible cooling loads. In most cases, supplemental dehumidication needed for the periods when there is low/no sensible cooling loads.
    Units like the Ultra-Aire dehumidifiers have latent only with sensible reheat. Ultra-Aire has the high latent cooling and a small amount of sensible cooling.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #3
    Quote Originally Posted by teddy bear View Post
    Consider the building materials ability to allow moisture diffusion from oustide. Also consider the internal moisture load from activities.
    The a/c is able to provide dehumidification only when there is sensible cooling loads. In most cases, supplemental dehumidication needed for the periods when there is low/no sensible cooling loads.
    Units like the Ultra-Aire dehumidifiers have latent only with sensible reheat. Ultra-Aire has the high latent cooling and a small amount of sensible cooling.
    Regards TB
    thnx teddy but one more thing most of the units are categorized as CMH of air handled but I am calculating as per L/hr of moisture to be removed from the room.I am very confused regarding this,can u explain this to me what is the difference b/w L/hr and CMH and how CMH has to be calculated??just curious.

    thnx in advance

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