ForIn a 500-square-meter workshop environment, installing ducted air conditioning units is a professional engineering project that requires a comprehensive consideration of process requirements, spatial characteristics, and system efficiency. As the core location for production activities, workshops typically feature high ceilings, high heat output from equipment, uneven personnel density, and high dust concentration, which place higher demands on the load calculation of the air conditioning system, air flow organization, and equipment selection.
Phase 1: Pre-Planning and Design for the Installation of Air Handling Unit Air Conditioning in the Workshop
1. Precise Load Calculation
The heat load in the workshop must be calculated based on the heat output of the process equipment, personnel density, and lighting conditions, rather than simply estimated by area. For a 500㎡ workshop, if the height is greater than 4 meters or there are high-power equipment, the cooling capacity configuration needs to be increased.
Maintain a cold air flow within the range of 6-8 m³/(h·㎡) to ensure the required number of air changes is achieved.
2. Equipment Selection and Layout
Prefer high static pressure type duct fans (static pressure ≥ 80Pa) to overcome the resistance of longer ducts in the workshop.
Ensure ≥1.2 meters of maintenance space for the main unit installation, and maintain a unified pipeline direction for multiple units for easier maintenance.
The indoor unit should be suspended away from the overhead production line to prevent condensation from dripping and contaminating the products.
Secondly, Workshop Air Duct System Installation Standards
Installation Precision Control
Horizontal ductwork: deviation per meter ≤ 3mm, total deviation ≤ 20mm
Ductwork: Deviation per meter ≤ 2mm, Total deviation ≤ 20mm
Pipe Distance from Wall: When the duct is laid along the wall, the wall distance of the pipe shall be ≥150mm to ensure sufficient space for the operation of the flange bolts.
2. Bracket and Hoist
For duct diameters ≥ 400mm, the spacing between horizontal hangers should be ≤ 3 meters; for diameters < 400mm, the spacing should be ≤ 4 meters.
Each ventilation pipe is equipped with at least two mounting brackets, secured using 8mm or thicker threaded rods, double nuts, and shock-absorbing pads to prevent operational resonance.
3. Special Operating Condition Handling
Condensate Drain Lines: Must maintain a slope of ≥5‰; strictly no water traps allowed; flexible hoses must not be flattened or bent.
Humid Air Duct: No longitudinal seams at the bottom; if seams are present, they must be soldered with solder or sealed with sealant.
Through-the-wall Outdoor Installation: When the air duct extends more than 1.5 meters out of the roof, it must be secured with ≥3 tension ropes and equipped with a rain shield.
III. Key Points for the Installation of the Air Handling Unit Air Conditioning Equipment in the Workshop
Indoor unit installation
The return air outlet should be at least 150mm from the wall and 200mm from the window; if there is a pipe behind, it should be at least 300mm from the wall.
Dust protection must be implemented after installation: the return air vent is sealed with double-sided aluminum foil, and the exhaust air vent is enclosed with nanofabric.
Maintain the machine completely level to prevent poor drainage of condensate trays.
2. Copper tube installation
Bending pipes must be done with a bending tool; hand bending is prohibited to prevent wall folds that could lead to uneven refrigerant pressure.
Welding slag must be blown off post-welding, followed by a 48-hour pressure retention test (pressure ≥ 4.0 MPa) to ensure no leakage points.
Selection of分歧管 must match brand: Midea and Toshiba use U-shaped分歧管; Daikin and Mitsubishi Electric can use Y-shaped分歧管
Four: Installation of ducted air conditioning units, electrical, and control systems in the workshop
Power Configuration
Indoor units with electric auxiliary heating must be installed on a separate circuit, using 4mm² wire and an independent circuit breaker; units without electric auxiliary heating require 2.5mm² wire.
It is recommended to use separate circuit control for the main unit and the internal unit to avoid simultaneous startup current surges from multiple units.
2. Condensate Water Protection
Water level switches must be installed to prevent condensate overflow and damage to equipment.
Pipe fully insulated throughout, sealed at joints with adhesive.
V. Special Environment Considerations for the Workshop
Dustproofing and Cleaning
When installing ductwork in a clean room, it must be wiped clean prior to installation, achieving a standard of oil-free and dust-free.
During construction interruptions, all pipe openings must be temporarily sealed to prevent slag and dust from entering.
2. Vibration and Noise Reduction
Flexible soft joints are used at the connection points between the equipment and ducts, ranging from 150-300mm in length.
10mm or more shock-absorbing rubber pads or shock absorbers for the base mounts, and spring shock-absorbing pads for the hanging brackets
3. Post-Maintenance
The lower section of the return air duct must have a maintenance access hole (≥400×400mm) for easy removal and motor repair.
A ventilation measurement hole and cleaning port are pre-set at an appropriate location in the duct.
