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What are the key points in the selection of high-efficiency air supply outlets?

The selection points of high-efficiency air supply outlet

1, the air outlet arrangement needs to consider indoor airflow organization, noise, building decoration aesthetic requirements, installation, and maintenance, as well as economic factors. In the selection, should determine the air velocity of the air outlet, and calculate the air volume, effective area, and range. Special attention should be paid to the influence of building beams or columns etc. on airflow. For some air conditioning areas with special technical requirements and occasions with large air volumes, the selection of air outlets should be supplemented by computer simulation (CFD) methods to determine.

2, the upper air supply, the general room should be used a louvered air outlet or strip slit air outlet, and other side delivery, side airflow should be attached; when there is a ceiling, according to the height of the air-conditioning area and the use of the airflow requirements of the place, respectively, using round, square diffusers; space for larger public buildings or room temperature fluctuations allowed range greater than or equal to 1.0 ℃ of the tall plant, it is appropriate to use the spout or cyclone air outlet air supply.

3、The installation of a side-mounted replacement air supply outlet is suitable for a height of less than 0.8m from the ground; the outlet air velocity should not be greater than 0.2m/s for civil buildings and 0.5m/s for industrial buildings.

4、For places with large indoor heat dissipation (such as computer rooms) or tall spaces (such as theatres), priority should be given to the lower air supply air outlet with stable airflow characteristics. If the building structure is restricted, priority should be given to the air outlet with good induction performance. When sending hot air in winter, attention should be paid to the phenomenon of indoor air thermal stratification, it is appropriate to use the air outlet with winter and summer adjustment functions. For the installation height of the air, the outlet is greater than 4m, it is appropriate to use the adjustable direction of the jet air outlet, to adapt to changes in the load.

5, high-efficiency air outlet air speed should be based on the air supply mode, air outlet type, installation height, indoor allowable air speed and noise, and other factors to determine. When the anechoic requirements are high, the louver air outlet, diffuser, slit air outlet air supply, etc. should be used at 2 - 5m/s airspeed, and the spout air supply can be used at 4 - 10m/s.

6, the wind speed near the return air outlet decay quickly, and the impact on the indoor airflow organization is small. Return air velocity of the face of the air outlet to determine three factors should be considered: First, to avoid excessive wind speed near the return air outlet, to prevent the return air outlet near the frequent stay of personnel caused by discomfort; Second, do not raise dust and increase noise due to excessive wind speed; Third, as far as possible to reduce the air outlet cross-section, to save initial investment.

7. The air velocity of the air outlet should be calculated according to the actual effective area.