Solution to water leakage of fan coil ceiling

Solution to water leakage of fan coil ceiling

The fan-coil system is supplied with chilled water by the chiller, and the water temperature is usually only about 8°C. Therefore, the chilled water supply and return pipes, condenser pipes and condensate trays are all relatively low in temperature. Condensation is prone to occur in summer and must be carried out. Thermal insulation, and the requirements for thermal insulation are relatively high. However, due to thermal insulation materials and construction reasons, the thermal insulation material cannot be closely attached to the pipe wall or pipe fittings, so that there are certain pores between the thermal insulation material and the pipe wall. When air enters the pores and hits the low temperature pipe wall, it will produce Condensate, the more condensed water accumulates, it will seep out and wet the ceiling. Example: Due to the use of glass wool tube shell for heat preservation, it is not easy to stick to irregular pipe fittings such as valves. Condensation water is generated on the surface of the tube fittings and sucked into the tube shell. After the entire glass wool tube shell absorbs enough water, the condensation drips out and wets the ceiling. . In other projects, the condensate pan is not insulated, so that secondary condensate is formed under the condensate pan and soaks the ceiling.

　　 With the improvement of building grades, many buildings' air-conditioning water systems use rubber and plastic insulation materials. This material has great advantages in material structure, thermal conductivity, surface heat release coefficient, and water vapor permeability coefficient, especially its construction performance is much better than glass wool, especially suitable for irregular-shaped pipe fittings and valves The thermal insulation greatly reduces the condensation and dripping caused by construction.

　　 condenser tube setting:

　　 Nowadays, due to the needs of many building developers for building economy or special purpose, the building height is generally low, resulting in a narrower space in the ceiling, which is extremely unfavorable to the layout of the air duct and water pipe of the fan coil. The condensate discharge of the fan coil is realized by the slope of the condensing pipe. When the space in the ceiling is small, the slope of the condensing pipe is not enough, and sometimes even if there is no slope or reverse slope due to the negligence of the construction personnel, the condensate will not drain smoothly. It will accumulate in the drip tray and overflow after excessive accumulation. Soak the ceiling. Therefore, in the design and construction, it is necessary to ensure that the condenser tube of the fan coil has sufficient slope. For example, in a comprehensive building, due to business needs, a mezzanine is set between the first and second floors, resulting in extremely low heights of the first and mezzanine floors, which cannot meet the requirements for centralized discharge of condensate water from the fan coil system (the slope cannot be guaranteed). In the construction and design, the measures of setting up a standpipe nearby for drainage are adopted, that is, 2 to 3 coils are combined with a drainage standpipe and drained directly into the basement drainage ditch. In addition, some construction units used polyvinyl chloride hoses as condensing pipes for convenience and convenience during the construction. When the pipelines are long, they cannot guarantee the drainage slope due to insufficient rigidity. Therefore, galvanized steel pipe should be generally used, and the corrugated pipe should be used for connection with the condensate pan.

Since the condensate system is a pressureless system, the diameter of the condensing pipe has an important influence on the discharge of condensate. If the diameter of the condensing pipe is too small, it will increase the resistance along the way and make the condensate discharge unsmooth. Too big will waste materials. Generally, in the design process, the designer will determine the diameter of the condensing pipe based on the corresponding relationship between the diameter of the condensing pipe and the load of the fan coil listed in the design manual. In the actual construction, the supervision work must be strengthened to prevent the construction unit from replacing it with small-diameter galvanized steel pipes not according to the requirements of the construction drawings, resulting in poor condensate discharge in future use.