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Pressure Control/Airflow Measuring Stations: Type AFS, AFQ Barcol-Air manufacture a sophisticated range of units for all ductwork sizes for controlling pressure and accurate air volume measurement. These units can be used for laboratory applications to balance supply and extract volumes on extract hoods etc. or in standard buildings. They are of particular use in multi-floor, multi-tenanted buildings where system air/pressure can be shut-off, monitored, changed etc. to suit floor occupancy. Tenant billing can be programmed via the BMS from these units showing how much air has been used each min/hr/day etc. All in all a total energy efficient flexibility is built into any project system by using the above.
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1. Air flow measuring station rectangular: Type AER circular: Type AEP 2. Air flow measuring and control station rectangular: Type AFS circular: Type AFQ 3. Air flow measuring and system pressure control station rectangular: Type AHS circular: Type AHQ 4. Variable Air Volume unit with or without induction without induction: rectangular: Type NK, NL, or NS circular: Type NA or NB with induction Rectangular: Type NV 5. Speed controller (BMS) for air handling unit with inputs for - System pressure - Air volume |
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Control Description
The balancing system can roughly be divided in 3 standard control loops:
1 - Speed control
of central AHU
2 - Air balancing with or without system pressure control per floor or
zone "Air-Trac®"
3 - Temperature control per zone or room
The Air-Trac® system combines these loops to give maximum energy savings under all load conditions.
1 - Speed control of central AHU
The supply fan is controlled to keep the required pressure in the riser(s) to a maximum value but still allowing the system to maintain the design room conditions.
The extract fan can be controlled by equlasing supply and extract air flows to give the required under/over pressure in the building.
2 - "Air-Trac®", supply and return air balancing with or without pressure control
2A - Without pressure control:
The supply airflow is constantly measured and the extract air flow is matched or controlled to give the required under/over pressure per floor or zone.
2B - with pressure control:
The supply duct pressure is controlled to the minimum value that still allows the VAV units in this zone to maintain the design room conditions.
3 - Room temperature control:
A VAV unit controls the air volume to the room, depending on the cooling or heating load required thus saving energy consumption.
