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Air supply method of cylindrical surface wall attachment jet

A technology of attaching jets and cylindrical surfaces, applied in the directions of columns, piers, pillars, etc., can solve problems such as the supply air temperature should not be too low, the wind speed should not be too large, and the ability to eliminate the unit cooling load can be reduced, so as to improve air quality. and energy-saving effect, beneficial to human health, and the effect of reducing computing load

Inactive Publication Date: 2012-08-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, in order to meet the comfort requirements of the traditional down-mounted displacement ventilation, the design air supply temperature should not be too low and the wind speed should not be too high (≤0.3m / s), thus reducing the ability to eliminate the unit cooling load to a certain extent , making it unsuitable for building spaces with large unit cooling loads
Displacement ventilation usually adopts the airflow organization method of bottom side air supply. In many cases, the bottom side air supply is restricted, which hinders the popularization and application of displacement ventilation to a certain extent.

Method used

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  • Air supply method of cylindrical surface wall attachment jet
  • Air supply method of cylindrical surface wall attachment jet
  • Air supply method of cylindrical surface wall attachment jet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Under the condition that there are no obstacles on the surface of the cylinder (4), the numerical calculation model of the indoor cylinder 4 surface-attached jet flow ventilation method is established according to the actual use. The height of the air supply port 3 from the ground is 3000mm; On the wall, the width of the air supply port 3 is 100mm; the distance between the air supply port 3 and the cylindrical surface is 100mm; the air outlet direction of the annular slit air outlet is vertically downward, and the air supply speed is 1.5m / s;

[0020] In order to verify the air supply effect and indoor air flow of this embodiment, the zero-equation model that is most widely used in indoor gas flow calculations is selected here, and the control equations are established as follows:

[0021]

[0022] In the formula:

[0023] t : indicates time; : Indicates air density, kg / m 3 ; : equal to 1 for the continuity equation and equal to ( =1, 2, and 3, represent...

Embodiment 2

[0030] Others are the same as in Example 1, the distance between the annular slit air supply port and the cylindrical surface is 0mm (close to the cylindrical surface), and the distance between the air supply port and the cylindrical surface is changed from 100mm in Example 1 to close to the cylindrical surface. The calculated distance is The reduction of the thickness enhances the sticking effect, prolongs the sticking length, and reduces the possibility that the jet will break away from the wall in advance and enter the work area to cause air drying, and the air supply effect is better than that of Example 1.

Embodiment 3

[0032] Others are the same as in Embodiment 1, and the air outlet speed of the slit air outlet is 3m / s. The calculation draws the following conclusions: the greater the velocity of the air supply jet, the higher the distance between the attachment point and the ground, and the easier it is to form an attachment; on the contrary, the smaller the velocity of the jet air supply, the more difficult it is to form an attachment, which shows that when using the ventilation method of the invention, it should be If conditions permit, try to use a higher air supply speed; when the jet is attached to the wall, the velocity attenuation in the vertical direction becomes smaller, which further shows that the ventilation method of the invention can reduce the attenuation of the air supply speed, which is beneficial to the air supply. wind.

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Abstract

The invention discloses an air supply method of cylindrical surface wall attachment jet, which is characterized in that an annular static pressure box with an air inlet and an air supply outlet is arranged at the upper part of an indoor cylinder; the air supply outlet is an annular line diffuser; and the annular line diffuser supplies wind downward vertically and is attached to the outer surface of the cylinder. In the invention, the entrainment of supplied air to indoor air is reduced by utilizing an air supply mode of the cylindrical surface wall attachment jet to improve the air quality ofthe mixed top supplied air and the energy saving effect. When the air supply outlet and a cylindrical surface are nearer, the attachment effect of the cylindrical surface can be enhanced, the jet of the air supply outlet can deliver fresh air down to the ground, and an air pool phenomenon is formed in the bottom region in which indoor staffs move, and thereby, the effect which is similar to displacement ventilation in the aspects of air-flow organization, indoor temperature graded distribution and the like can be achieved. The invention is suitable for architectural environments with cylinderstructures.

Description

technical field [0001] The invention relates to an air supply method, in particular to an air supply method with jet flow attached to a cylindrical surface, and the method is suitable for indoor ventilation systems. Background technique [0002] An important part of indoor ventilation and air-conditioning systems is to discuss the issue of which supply air flow organization mode to adopt. Therefore, the supply air flow organization mode has attracted the attention of domestic and foreign researchers and engineering designers. There are two modes of airflow organization: (1) traditional mixing ventilation based on the principle of dilution; (2) modern displacement ventilation powered by buoyancy control. [0003] Traditional mixing ventilation is usually installed at the top of the room ( figure 1 ), mixed ventilation is characterized by high speed, large momentum and turbulent air supply. It is still widely used because it is easy to arrange in the building space and does n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F13/06E04C3/30
Inventor 李安桂陶鹏飞赵玉娇尹海国
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY