Number of views: 643 Author: AILI Industrial Release time: 2027-08-08 Source: Ai Li Industrial
The diameter of the water pipe in the air-conditioning box cannot be directly copied from the coil interface size. It should be determined by the design water volume, allowable flow rate, pipe length, accessory loss and available pressure difference. Coil joints are equipment connection conditions, while on-site pipelines are required to complete the entire hydraulic transportation task. The two may use different pipe diameters.
If the same coil is connected to branches of different lengths, height differences and valve configurations, the required pipe diameters and balancing methods may be different. Smaller pipe diameter will increase resistance and flow rate, and blind enlargement will also increase space and cost. Interface transitions should consider connection, venting, and maintenance to avoid transferring on-site piping loads to the coil joints.
The water volume should be based on the flow rate corresponding to the coil design working condition; the pipeline conditions should include the length, material, local accessories and allowable flow rate and pressure drop; the equipment interface should include the pipe size, direction, support and disassembly and assembly space. The three items correspond to different majors, and you cannot give just one interface size. What water parameters should be confirmed before connecting the air-conditioning box to the cold water system? Please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system?。
The size of the coil interface is determined by the coil design and manufacturing, and is usually selected based on the coil water resistance, flow rate and connection standard. On-site water piping needs to connect coils, valves, filters, balancing valves and pipes, while also overcoming along-the-way and local resistance. The tasks of the two are different, and the interface size cannot be directly used as the upper or lower limit of the on-site pipe diameter.
How the coil water flow corresponds to the design cooling capacity can be referred toHow does the water flow rate of the air conditioning box coil correspond to the designed cooling capacity? . How to select the type of surface cooler according to the air inlet and outlet conditions, please refer toHow to select the type of air conditioner cooler according to the air inlet and outlet conditions? . The coil water resistance and interface form should be stated in the equipment data.
The on-site pipe diameter needs to be determined based on the design water volume, allowable flow rate and pipeline resistance. If the pipe diameter is too small, the flow rate and resistance will increase, and the water pump needs to provide a higher lift; if the pipe diameter is too large, it will take up space, increase investment, and may also make the flow rate too low, which is not conducive to exhaust. Hydraulic calculations should also take into account the local resistance of valves, filters, elbows and reductions.
For water system pressure difference and flow conditions, please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system? . The water pump head and pipeline balance fall within the scope of water system design. The air-conditioning box manufacturer provides coil water resistance and interface information, and the on-site pipeline design is completed by the water system professional.
Coil joints often cannot withstand the weight and stress of on-site piping. Independent supports should be provided at the interface transition to prevent pipeline loads from being transmitted to the coil header. The position of the reducing diameter, exhaust valve and drain outlet should be convenient for operation and maintenance. High-level connections and low-level drainage also need to be considered when piping is laid out.
After the diameter of the water pipe changes, the exhaust and cleaning conditions will also change. Please refer toHow to combine the slope of the water pan of the air-conditioning box with the layout of the drain outlet? . For water sealing and drainage requirements in the negative pressure section, please refer toWhy does negative pressure drainage of air conditioning boxes often require water sealing?。
The equipment party should provide the pipe connection diagram, design flow rate and coil water resistance, and the engineering designer will calculate the branches and valves accordingly. If there is insufficient water on site, you should first measure the pressure difference, check valves and exhaust, and then determine whether the pipe needs to be modified; you cannot assume that it is the only bottleneck just because the interface is small.
How to write an inquiry form for air-conditioning boxes so that different quotes can be compared, please refer toHow to write an inquiry form for air-conditioning boxes so that different quotes can be compared? . How to list applicable standards in procurement technical documents, please refer toWhat applicable standards should be listed in the technical documents for purchasing air-conditioning boxes?。
When confirming the water coil with Aili Industrial, the flow rate, water resistance and interface location data can be obtained simultaneously to facilitate the water system designer to complete the pipeline verification. Aili's industrial manufacturing end covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. Coil interfaces, water resistance data and box structures can be corresponded in the same set of supporting materials; non-standard interfaces can be adjusted according to on-site pipeline conditions.
Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andEFU equipment end fan filter unit verification; terminal particle filtration can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific pipe diameter, interface form and delivery scope still need to be confirmed based on the corresponding configuration data and water system design. The actual effect is subject to on-site water system debugging and performance test results.
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The coil interface is DN50. Does the on-site water pipe also have to be DN50?
uncertain. The on-site pipe diameter should be determined by hydraulic calculations. The interface size is only a connection condition and may need to be reduced in diameter.
There is insufficient water on site. Is it because the interface is too small?
uncertain. The pressure difference, valves, filters and pipeline resistance should be checked, and the bottleneck cannot be judged based on the interface size alone.
What water side information can Aili Industrial provide?
Coil interface diagram, design flow rate and water resistance data can be provided. The specific pipe diameter and pipeline design need to be confirmed by the water system professional.
Check items |
Confirm key points |
Check items |
Confirm key points |
|---|---|---|---|
Water quantity basis |
Flow rate corresponding to coil design conditions |
Pipeline conditions |
Length, material, accessories and allowable pressure drop |
Device interface |
Nozzle size, direction and disassembly and assembly space |
load path |
Pipe weight is not transferred to coil joints |
Interface transition |
Diameter reduction, exhaust, sewage discharge and maintenance |
Debugging conditions |
Differential pressure, flow and exhaust inspection |
