On what basis should the sequence of functional sections of the air conditioning box be determined?

The sequence of functional sections of the air conditioning box is jointly determined by the air treatment process, pollution control, equipment protection and maintenance conditions. The common arrangement can only be used as a starting point and cannot be separated from the air inlet status, hot and cold tasks and air supply requirements. A general functional segment sequence diagram can be directly applied.

First draw the changes in air state, and then arrange the physical components

After clarifying the air inlet and target air supply status, determine where cooling and dehumidification is needed, and where reheating or humidification is needed, and then arrange filtration, fans and necessary maintenance space. The temperature rise of the fan may affect the final temperature, sufficient absorption conditions are required after humidification, and the impact of water droplets on subsequent components near the wet coil must be considered, all of which may change the arrangement.

The process sequence depends on what tasks each functional section undertakes when the air condition changes; the protection relationship depends on whether the upstream components will cause moisture, dust or contamination to the downstream parts; the maintenance conditions depend on whether the filter material, coil and fan can be inspected and replaced separately. If any of the three are not sorted out, the arrangement will just be copied. How to determine the starting point of air state change, please refer toShould the inlet air temperature and humidity of the air conditioning box be designed to be outdoor or return air?。

Why can’t common arrangements be applied directly?

The typical sequence in textbooks is usually 'fresh air - filtration - coil - fan - air supply', but in actual projects, preheating may be placed before the coil, reheating may be placed after dehumidification, and humidification may be placed at different positions before and after the fan. Taking the typical arrangement as the only answer can easily ignore the specific working conditions. For example, when preheating is required in winter, the preheating section should be placed before the location where freezing may occur; when reheating is required in summer, the reheating section should be placed after the dehumidification coil. These changes come from air handling tasks rather than a fixed sequence.

The position of the filter segments is also affected by the protected object. When placing the filter section before and after the fan, you need to consider the pre-filtration effect, negative pressure side sealing and positive pressure side air flow uniformity. Please refer toWhat needs to be considered when arranging the filter section before and after the fan? . When high-efficiency filtration is required, the arrangement inside the machine or at the end will also change the order. Please refer toShould the high-efficiency filter of the air-conditioning box be placed inside the machine or at the end of the air supply?。

Protective relationship determines who is in front of whom

If the upstream components will cause moisture, dust or contamination downstream, the sequence must be adjusted. Water droplets after the wet coil may affect subsequent filters or fans, so a water-blocking or water-removal structure is usually required behind the coil; a sufficient absorption distance is required after the humidification section to prevent water mist from entering downstream components; if the chemical filtration section is located in a high-humidity area, it may be necessary to avoid the high-humidity airflow after the coil, please refer toHow to judge whether the MAU chemical filtration section is arranged before or after the surface cooler? . These protective relationships are not 'customary practices' but are determined by the working conditions of the components.

Turn the sequence into a checkable configuration list

The configuration table should be numbered section by section from air inlet to outlet, indicating the wind direction, airflow cross section, resistance and control measuring points. If the length of the equipment is limited, the required processing distance and maintenance space should be re-evaluated instead of deleting the transition section without obvious 'capacity parameters'. After the plan is changed, the temperature measurement points and electronic control logic must also be updated simultaneously.

After the sequence of functional sections is changed, the length of the mixing section, the position of the access door and the sensor measuring points may be affected. Please refer toHow long is the air mixing distance required in the mixing section of the air conditioning box? andWhen a horizontal air-conditioning box is arranged against a wall, which side should be left for inspection? . Whether it can be compressed when the device length is limited, please refer toCan the length of the horizontal air conditioning box be reduced when there is insufficient plane space?。

Aili industrial supporting equipment

Aili Industrial can jointly check the arrangement of functional sections based on the overall machine structure, filtration and electronic control equipment. It is advisable to submit the flow chart and installation space diagram at the same time during technical confirmation. Aili's industrial manufacturing end covers independent R&D and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. The interfaces, resistances and measuring points between functional sections can be aligned in the same set of packages; non-standard arrangements can be adjusted according to the project air treatment process.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andHEPA/ULPA filter verification; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific arrangement, performance and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. Actual results are subject to on-site leak detection and performance test results.

Submit project parameters:https://ailigy.com/contactus.html

Related questions and answers

Is there a standard diagram for the sequence of functional segments that can be copied?
There is no standard diagram that works for all projects. Common arrangements can only be used as a starting point, and the actual sequence must be determined based on the air inlet status, processing tasks, and protection relationships.

Does the filter section have to be placed in front of the coil?
uncertain. It depends on whether the filtration task is to protect the coil, protect the fan or control air supply particles. Different goals correspond to different positions.

Can Aili Industrial help determine the functional segment arrangement?
The arrangement and interface can be checked based on the air treatment process, installation space and electrical control measuring points. The specific plan needs to be confirmed according to the project conditions.

Related articles

1. What needs to be considered when arranging the filter section before and after the fan?

2. Should the high-efficiency filter of the air-conditioning box be placed inside the machine or at the end of the air supply?

3. How long is the air mixing distance required in the mixing section of the air conditioning box?

4. Can the length of the horizontal air conditioning box be reduced when there is insufficient plane space?

Key points for selection and acceptance inspection