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The installation of dry air coolers (DCC) in the cleanrooms of the electronic industrial plant
2026/4/21
The installation of these coils requires following multiple operational specifications, including installation layout, dimensions and spacing, fixation and sealing, as well as hydraulic and airflow balance. The specific details are as follows:
PART 01 Determination of Installation Location and Installation Form
Core installation area: The preferred choice is the return air ducts located in the upper and lower plies of the cleanroom. This position can align with the airflow circulation path. For example, in a semiconductor factory, the return air can flow through the plies, pass through the DCC, and then mix with the air treated by the fresh air unit before being recirculated. For a few areas with top supply and top return, such as changing rooms, they can be installed in the ceiling. If the original position conflicts with large-diameter mechanical and electrical pipelines, it needs to be shifted or the size of the coil needs to be adjusted for a new layout.
Main installation forms: There are three types: horizontal, vertical, and inclined. Horizontal installation saves space and is suitable for areas with low cleanliness and where it is inconvenient to install return air ducts, but it does not have a water collection tray and is prone to condensation, and cannot be installed above the equipment; vertical installation can be equipped with a water collection tray and condensate pipe, providing good anti-condensation effect, and is mostly installed on the side of the upper and lower air ducts, but it occupies more building space; inclined installation is mostly used in return air ducts, balancing the need for space utilization and anti-condensation requirements. Some projects will also adopt L-shaped or V-shaped installation to adapt to special duct structures.
PART 02 Dimension and Maintenance Space Control
Base size adjustment: The external dimensions of the dry coil need to be corrected based on the manufacturer's parameters. For example, if the actual length from the outer frame to the outer side of the collecting pipe by the manufacturer is 120mm, the overall layout needs to be adjusted accordingly. The maximum installation length of the design = the designed effective length + the side frames (usually 50mm on each side) + the length from the outer frame to the outer side of the collecting pipe. It needs to be calibrated according to the actual production parameters.
Maintenance space reserve: The maintenance clear distance between the adjacent main coil manifold and the other coil frame is ≥ 100mm, and the inner edge spacing of the frame is ≥ 320mm (it is recommended to take 350mm). When the connection pipe is adjacent, it is preferred to adjust it to ≥ 400mm to avoid restrictions on subsequent maintenance.
PART 03 Fixed structure and sealing treatment
Stable Installation: DCC is typically fixed using steel structures for support. Vertical dry air conditioning coils can be connected to the cross-beam of the building's steel structure via snap-fit or spring clamps; after being connected to the steel framework with bolts and nuts, additional countersunk screws are added for reinforcement. When assembling the support structure, ensure that the pressure-bearing surface is level to avoid gaps between the coil and the support, which could affect the uniformity of air flow.
Air sealing plug: The gap between the coil pipe and the frame needs to be sealed with 1.0mm thick galvanized steel plate. At the gap, aluminum foil tape and sealant are used for treatment. Before installation, a sealing strip is attached to the contact surface between the coil pipe and the support to prevent air leakage and ensure that all the air flow in the return air duct passes through the dry coil pipe for heat exchange.
PART 04 Hydraulic and Airflow Parameter Matching
Hydraulic balance control: Since the return air ducts in the clean rooms of the electronic factory may be quite long, it is necessary to ensure that the hydraulic imbalance of each DCC is ≤ 10%. For the non-isochronous pipeline system, the pipe diameter can be adjusted or a balancing valve can be added by calculating the along-the-way resistance and local resistance to avoid insufficient cooling capacity at the far end of the coil. Each DCC's cooling capacity should reserve about 15% of margin. If the effective area of the coil needs to be reduced, the heat transfer capacity can be improved by increasing the fin density or optimizing the接管 form.
Air flow parameter specification: To ensure the heat exchange effect and the stability of the clean air flow, the recommended wind speed through DCC should be controlled at around 2m/s, with a maximum not exceeding 2.5m/s; the inlet temperature of chilled water needs to be higher than the indoor air dew point by approximately 2℃ (commonly the inlet is 13℃ and the outlet is 18℃), to prevent condensation. CFD software can also be used to simulate the air flow pattern and temperature field to verify the rationality of the layout.
PART 05 Auxiliary Design and Detail Optimization
CAD calculation and BIM modeling can be utilized to visually display the layout of DCC, control valve groups and piping, thereby avoiding pipeline conflicts in advance.
If the local space is insufficient, the effective length of the coil can be reduced while increasing the height, while keeping the total effective area unchanged. If the height space is also limited, the air velocity on the surface and the density of the fins can be appropriately increased to ensure that the heat exchange capacity meets the requirements.
The coil should preferably use aluminum fins that have been treated with anti-corrosion blue wave. The electric water valve of the coil needs to be coordinated with the temperature and humidity sensor of the MAU unit to ensure the accuracy of the system's linkage control.
