Air duct design & noise reduction
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II. Existing problems in air duct noise control and measures of solution
z
Main equipment
Problem 1: Too large size of unit selected
Careful air conditioning load is not carried out according to cooling/heating load detailed
calculation method or rough calculation method specified in relevant standard or book, or in
combination with application site information. For instance, 5HP unit is selected where 4HP
or 3HP should have been selected. This will cause higher noise due to limited space if air
conditioning and small distance between indoor unit and conditioned space.
Solution:
By referencing relevant standard, book or experience, carefully calculate air conditioning
cooling/heating load and select correct type.
Problem 2: Improper installation
Proper installation position is not selected according to installation key points described in
“Product installation and operation manual” and “Chunlan home (commercial) centralized air
conditioning system design code: (e.g.: indoor unit is too near conditioned area or in such
area), or proper fixing, damping and sound insulation is not carried out.
Solution:
(1) Indoor unit shall be installed away from environment and rooms that require quietness.
The unit can be can be installed in special equipment room, toilet, storeroom or other
ancillary rooms. If this is not feasible, make sure to contact our quality management section to
obtain proper noise reduction solution as soon as possible to avoid rework and loss.
(2) Use elastic material to fill air delivery/return dust penetrations through enclosure and gap
around holes;
(3) Suitable sound insulation measures shall be taken in equipment room according to
permitted noise level of nearby rooms and buildings. If the equipment room is near room(s)
with high requirement, sound insulating doors and windows shall be used for equipment room
(this clause is subject to Owner agreement).
(4) Lifting and installation method shown in the figure below is preferred. In the figure, at
lower end of unit are two angle steels, on top of which is a 15mm wood plate of the same size
as that of unit bottom size. 10mm thick PE board is mated on the wood plate.
z
Air duct system
Problem 1: Flexible connection is not used for unit air delivery/return ports
Air delivery/return duct is directly connected with unit and no flexible hose connection is
used, causing unit vibration being transmitted by pipeline and excessive noise in conditioned
area.
Solution:
Use 200mm-300mm long canvas, 3-proof cloth or soft metal insulating tube between unit air
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