What project information should be prepared before selecting an air-conditioning box?

The selection of air conditioning box requires at least the air treatment task, design air volume, corresponding external static pressure, air inlet and outlet status, cold and heat sources, and installation conditions. The data should distinguish between determined parameters and parameters to be verified, and on-site estimated values ​​cannot be defaulted to the equipment's guaranteed working conditions.

Use one working condition table to unify input from different professions

The designer usually provides the air volume and air status, provides space and interfaces on site, and the equipment user explains the operating shifts and process fluctuations. Putting this information in the same version of the table and indicating the source for each item can avoid selecting the fan according to one working condition and calculating the coil according to another working condition.

Performance inputs include air volume, pressure, inlet and outlet air temperature and humidity, and representative operating modes; on-site inputs include length, width, and height, transportation channels, air outlets, and maintenance directions; supporting inputs include water temperature and flow, power supply, control signals, and supply boundaries. If one of the three types of inputs is missing, the selection will lack a closing condition. How to determine the air treatment task starting from the air inlet status, please refer toShould the inlet air temperature and humidity of the air conditioning box be designed to be outdoor or return air?。

The air volume and pressure must be clearly stated.

The design air volume needs to indicate whether it is supply air volume, fresh air volume, return air volume or mixed air volume, and the unit is m³/h, L/s or CFM. For conversion relationships between different units, please refer toHow to convert the air volume unit of air conditioning box in m³/h, L/s and CFM? . For the relationship between fresh air and total air supply volume, please refer toHow to calculate the fresh air volume and total air supply volume of the air conditioning box separately? ;How to determine the proportion of new return air, please refer toHow is the proportion of new return air to the air-conditioning box determined by project requirements?。

The pressure caliber also needs to be specified. External static pressure, total pressure and static pressure have different meanings, please refer toWhat is the difference between static pressure, total pressure and static pressure outside the air conditioner box? . What functional segments constitute the resistance within the machine? Please refer toWhat functional segments should be included in the internal resistance of the air conditioning box? . Just write a pressure number without indicating the caliber, and it is easy to use two sets of standards for equipment selection and on-site acceptance.

The air inlet and outlet status and hot and cold sources must be provided in groups

The air treatment task cannot only give one outlet air temperature. It is necessary to simultaneously indicate the dry and wet status of the inlet air, the target outlet air temperature and moisture content, whether to dehumidify or humidify, whether to reheat, and the corresponding air volume. 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? . How to determine the amount of humidification in winter, please refer toHow to determine the humidification amount of air-conditioning box according to the air inlet conditions in winter? . How to calculate the mixed air state, please refer toHow should the temperature and humidity of the mixed air in the air conditioning box be calculated?。

Cold and heat source conditions include supply and return water temperature, available flow, operating pressure, water quality and interface form. How to confirm the cold water parameters, please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system? . How to choose between hot water and electric heating, please refer toHow to choose between hot water heating and electric heating for air conditioning boxes? . When the cold and heat source data are incomplete, the coil calculation can only be tentative, and subsequent changes will affect the overall machine size and interfaces.

Installation conditions must be confirmed simultaneously with equipment selection.

Site space, transportation access, foundation height, maintenance direction and drainage conditions will all in turn affect the structural form. Horizontal and vertical types require different space, please refer toWhat kind of space do horizontal air-conditioning boxes and vertical air-conditioning boxes require? . How to leave the maintenance side when arranging against the wall? Please refer toWhen a horizontal air conditioning box is placed against a wall, which side should be left for inspection? . How to identify segmented transportation, please refer toHow to identify the assembly sequence for segmented transportation of combined air-conditioning boxes? . For the relationship between foundation height and drainage, please refer toHow to determine the foundation height of a horizontal air conditioning box based on drainage conditions?。

If the equipment needs to be connected to building automation, you should also prepare the point table requirements in advance. Please refer toWhat point tables need to be provided before the air-conditioning box is connected to the building automation system? . The control interface, sensor position and interlocking conditions should be confirmed simultaneously with the structural selection, rather than waiting for the equipment to arrive on site.

Reserve an explicit confirmation action when parameters are temporarily missing

If the static pressure is insufficient, the system resistance data should be supplemented or measured; if the load is insufficient, the designer should first calculate it. The selection document can list tentative conditions, but these conditions need to be converged during the technical confirmation stage. Freezing the chassis size first and then supplementing the performance parameters will often result in repeated adjustments.

The sequence of functional sections, filter section position and fan working point will also change with the parameters, please refer toOn what basis should the sequence of functional sections of the air conditioning box be determined? andWhy should we check the efficiency range when selecting air-conditioning box fans? . Listing the person responsible for the items to be confirmed and the closing time makes it easier to move forward than leaving vague notes on the drawings.

Aili industrial supporting equipment

When submitting to Aili Industrial, you can attach installation drawings and operation requirements at the same time; motors, fans, filtration and control packages will be jointly checked accordingly to reduce deviations caused by different data versions. Aili Industrial can jointly check the fan, motor, filter, sheet metal and control configuration, and put the performance input, on-site input and supporting input in the same working condition table during the planning stage; the manufacturing end covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. Functional segment interfaces and operating points can be confirmed in the same set of packages.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andCheck the fan filter unit at the EFU equipment end ; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions; terminal particle filtration can be combined withHEPA/ULPA filter confirmed. The specific performance, applicable environment 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

Only air volume and cooling capacity are provided. Can the air conditioning box selection be completed?
not enough. The pressure caliber, air inlet and outlet status, cold and heat source conditions and installation conditions are also required. Without these contents, the equipment configuration can only be tentatively determined.

Can the on-site estimated value be directly used as the guaranteed working condition of the equipment?
Not recommended. The estimated value should be marked as pending verification and replaced by design or field measurement data during the technical confirmation stage to avoid subsequent repeated adjustments.

Can Aili Industrial help organize the selection information?
The data list can be sorted out based on the air tasks, site conditions and supporting requirements. The specific configuration needs to be confirmed based on the project conditions and product data.

Related articles

1. What is the difference between static pressure, total pressure and static pressure outside the air conditioner box?

2. How to select the type of air conditioner cooler according to the air inlet and outlet conditions?

3. What kind of space do horizontal air-conditioning boxes and vertical air-conditioning boxes require?

4. What point tables need to be provided before the air-conditioning box is connected to the building automation system?

Key points for selection and acceptance inspection