Combined air hanging units include functional sections like filtration and cooling. They process air without their own heat source. These units are widely used in various applications. Design or manufacturing issues often cause problems. Users may face issues like low air volume or condensation. These problems can reduce system performance. This article analyzes common issues and offers solutions to avoid selection errors.
Insufficient air volume or insufficient cooling capacity is a common problem in model selection. This may be due to inaccurate equipment selection basis or insufficiently rigorous design parameters of the manufacturer. Some manufacturers may even reduce the specifications of the surface cooler during the production process to reduce costs, resulting in insufficient actual performance.
Condensation on the cabinet is usually related to the substandard thermal resistance of the insulation material or unreasonable cold bridge design. Cabinet deformation mainly occurs in large air volume units, especially in the positive pressure section or negative pressure section, which may cause air leakage or frost at the connection parts.
According to national standards, when the static pressure in the box is 700Pa, the air leakage rate shall not exceed 3%. However, in reality, the air leakage rate of some units is as high as 5%-10%, mainly due to poor performance of sealing materials, unreasonable structural design or poor installation quality.
Surface cooling section drift is usually related to excessive wind speed on the windward side, while condensate pan overflow may be caused by missing water seal design or insufficient condensate pan size.
Use materials with thermal resistance ≥ 0.68 m²/K·W. Choose PEF or polyurethane foam. Add cold bridge partitions to prevent condensation.
Keep wind speed between 2-2.5 m/s. High wind speed causes water drifting. Design water retaining plates to meet specifications. Reduce carried water droplets.
Select high-quality sealing materials and optimize the unit structure design.
Improve the installation process standards to ensure the tightness of on-site assembly.
Large air volume units need to add reinforcement ribs or use high-density insulation boards to enhance the rigidity of the box.
Verify manufacturers' calculation methods. Ensure parameter accuracy. Select manufacturers with reliable testing capabilities.
Increase the length and depth of the condensate tray, and set a water seal in the negative pressure section unit to avoid water overflow.
The selection of Combined air hanging units directly affects the operating effect of the system. When selecting, you should pay full attention to core parameters such as air volume, heat and cold, and air leakage rate, and choose a manufacturer with good reputation and complete testing methods. Through reasonable design and installation, you can effectively avoid common problems and improve the operating efficiency and service life of the unit.
