How to check the sensible heat and moisture load of the equipment in the air-conditioning box of the advanced packaging workshop?

The load of the air-conditioning box in the advanced packaging workshop should be checked against the actual sensible heat and moisture released by the equipment into the room. The total electrical power on the equipment nameplate cannot be directly included in the air load. Heat entering process cooling water, independent exhaust air, or product processes should be differentiated by design based on actual energy paths.

Track where heat and moisture go for every device

The equipment information should describe the operating power, working ratio, heat taken away by the cooling water, exhaust air volume and heat dissipation to the environment. When cleaning, drying or other wet processes are involved, also confirm whether moisture is being removed independently or whether it is entering the room. The peaks of different production states may not occur at the same time, and the combined working conditions should be confirmed by process and design.

The sensible heat input should include actual sources such as equipment heat dissipation, lighting, personnel and enclosures; the moisture load input should include process moisture dissipation, moisture brought in by personnel and air exchange; the diversion conditions should include process cooling, independent exhaust and the equipment's own environmental control. The three types of information correspond to different load paths and cannot be given only one total power. Circulating air handling units should be selected based on which indoor loads, please refer toWhat indoor loads should the circulating air handling unit be selected based on?。

Equipment nameplate power is not equal to room sensible heat load

Equipment nameplate power usually includes shaft power, heat removed by cooling water, and heat dissipated to the environment. Some equipment removes heat through process cooling water or independent exhaust air. Only the air heat actually entering the room belongs to the sensible heat load of the air conditioner. Taking all the nameplate power into the room load may lead to the selection of an air conditioning box that is too large.

Equipment operating conditions and simultaneous usage factors also affect peak loads. Multiple equipment will not operate at full capacity at the same time, and load calculations should be combined with production shifts and equipment operating status. The sensible heat load and moisture load of the equipment must be listed separately and cannot be estimated together.

The heat taken away by the process cooling water must be deducted separately

Advanced packaging equipment is often equipped with a process cooling water system to remove heat from the equipment. This part of the heat does not enter the room air and should not be repeatedly included in the sensible heat load of the air conditioner. When checking, the equipment cooling water flow rate, supply and return water temperature, and heat taken away should be obtained, and compared with the total power of the equipment to confirm the remaining heat dissipation to the room.

How to confirm process cooling water parameters, please refer toWhat water parameters should be confirmed before connecting the air conditioning box to the cold water system? . The cooling water system is different from the air conditioning cold water system and parameters cannot be mixed.

The source of moisture load should be checked item by item

Shop wet loads can come from personnel breathing and sweating, process cleaning, drying, floor moisture evaporation and enclosure infiltration. In advanced packaging processes, cleaning and drying processes may produce short-term moisture loads. The wet load should be distinguished between continuous and intermittent, and the occurrence period and simultaneous use conditions should be noted.

How to calculate the dehumidification capacity from the air moisture content difference, please refer toHow to calculate the dehumidification capacity of air conditioning box from the difference in air moisture content? . The role of supply air dew point in selection can be referred toWhat role does the supply air dew point play in the selection of fresh air air conditioning boxes?。

The moisture and heat taken away by independent exhaust air must be deducted

The local exhaust of the equipment may take away some heat and moisture. If the exhaust air is directly discharged to the outside, this part of the load does not enter the room air and should not be included in the load of the air conditioning box. The exhaust air volume, exhaust air temperature and moisture content should be checked, and the air volume should be balanced with the supply air and return air.

How the fresh air tasks of the clean room MAU correspond to the process exhaust air, please refer toHow does the fresh air task of the clean room MAU correspond to the process exhaust? . For the relationship between fresh air volume 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 convert load meter into air conditioner box conditions

The designer determines the air volume and air supply status based on sensible heat, moisture load and system division of labor, and then leaves it to the unit selection. When expanding production of new equipment, the load mix and energy supply conditions should be updated, rather than just scaling up the units in proportion to the number of new units. If there is no equipment heat dissipation data, the missing items should be marked and the data should be filled in to avoid using rough estimates as guaranteed values.

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 air supply volume of the air conditioning box is determined according to the number of air changes or the cooling and heating load. Please refer toIs the air supply volume of the air conditioning box determined based on the number of air changes or the cooling and heating load?。

Aili industrial supporting equipment

Aili Industrial can check the air treatment and equipment-end air supply matching according to the working conditions confirmed by the design. The equipment load table and exhaust information are attached when consulting, which helps to reduce repeated measurement. 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 and operating points of circulation units, MAUs and terminal air supply equipment can be matched in the same package; non-standard air volume can be adjusted according to regional load.

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 solution; multiple devices can be linked together to understandFFU computer group control system . Supporting method of The specific load distribution, unit performance and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. The actual effect is subject to on-site air volume balance and performance test results.

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Related questions and answers

Can the equipment nameplate power be directly used as room sensible heat load?
cannot. Part of the heat is taken away by the process cooling water or exhaust air, and only the heat that actually enters the room is included in the sensible heat load of the air conditioner.

Does the heat taken away by the process cooling water also be included in the air conditioning load?
Usually there is no need to double-count, but the cooling water flow, temperature difference and heat taken away should be checked to confirm the remaining heat dissipation to the room.

Can Aili Industries assist in checking the advanced packaging shop load?
The air conditioning box configuration can be checked based on the equipment load table, exhaust information and system division of labor. The specific load distribution needs to be confirmed by the system design.

Related articles

1. What indoor loads should the circulating air handling unit be selected based on?

2. How does the fresh air task of the clean room MAU correspond to the process exhaust?

3. How to calculate the dehumidification capacity of air conditioning box from the difference in air moisture content?

4. Is the air supply volume of the air conditioning box determined based on the number of air changes or the cooling and heating load?

Key points for selection and acceptance inspection