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the bringing of fresh air to the cassette making natural or mechanical ventilation?

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  1. [1]
    rhvac
    rhvac غير متواجد حالياً

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    تاريخ التسجيل: Apr 2007
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    the bringing of fresh air to the cassette making natural or mechanical ventilation?

    I want to ask question about bringing fresh air for the cassette.
    Is the bringing of fresh air to the cassette making natural or mechanical ventilation?
    The fan of the cassette, can aspire the fresh air laterally?
    If the bringing of fresh air is mechanical, how can we size the duct because the air flow is very small 90m3/h

  2. [2]
    اسكندر عمجة
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    عضو متميز


    تاريخ التسجيل: Aug 2005
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    Regarding your questions my friend
    First of all, Cassette type doesn't have any opening for fresh air. It's totally recirculated air. But the point is only fresh air can be brought by Infiltration which depends on the windows and doors of the room.

    Secondly, the fan will not distinguish between infiltrated air and recirculated air. Only what will be affected is the cooling of the supply air counting on the infitrated air temperature and the existing air temperature in the room

    Thirdly, you can not connect duct to a cassette type! It is mini split system.

    I'm afraid you mean DUCTED SPLIT SYSTEM.If so, please inform us about it
    and I will give you the solution

    Salam

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    م/أمين مطر

  3. [3]
    rhvac
    rhvac غير متواجد حالياً
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    تاريخ التسجيل: Apr 2007
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    thank u Mr.But the cassette i spoke about is VRV type and contain a fresh air intake .Flow 90 m3/h and diameter 100 mm.i will join a technical file of it.my question is must we suplly 90m3/h by a fan or the fan of casette aspire 90 m3/h.
    http://www.megaupload.com/?d=VF9ONB8H

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  4. [4]
    اسكندر عمجة
    اسكندر عمجة غير متواجد حالياً
    عضو متميز


    تاريخ التسجيل: Aug 2005
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    Can you ask the supplier of this cassette about this "knockout duct"?? because my friend, It might be discharging -as outlet to the plenum- not sucking the air because of positive pressure of the fan.

    and ask him about the static pressure of the cassette fan
    please tell me what will happen with you

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    م/أمين مطر

  5. [5]
    snow man
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    تاريخ التسجيل: Dec 2008
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    hi
    I have worked on cassete units connected with flixeble hose supply fresh air to the cassete unit, &that hose comes from A H U

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