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Overhead wall adherent low diffusion ladder flow air supply system for displacement ventilation

A technology for replacing ventilation and air supply systems. It is applied in the field of air supply systems and can solve problems such as polluted air, waste of cooling capacity of air supply jets, and reduced ventilation efficiency.

Inactive Publication Date: 2010-09-08
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, the current problem with displacement ventilation (traditional displacement ventilation) is that the air supply device of this air-conditioning method is usually arranged in the lower part of the room. The limited area layout and the threat of wind sense lead to a low capacity to bear the cooling load of the room, and sometimes the air outlet is not allowed in the work area, which affects its wide application in engineering
If the air supply device for displacement ventilation is arranged in the upper part, it can overcome some shortcomings and deficiencies in the above-mentioned traditional displacement ventilation outlet arrangement, but the negative effect caused is that the air supply jet must pass through the upper part of the air-conditioned room. area, resulting in the entrainment of high-temperature hot polluted air in the upper non-working area, which wastes the cooling capacity of the air supply jet and reduces the ventilation efficiency. It is a technical problem to be solved that it is possible to reduce the entrainment effect of the jet when it passes through the upper non-working area in the process of flowing downward against the wall.

Method used

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  • Overhead wall adherent low diffusion ladder flow air supply system for displacement ventilation
  • Overhead wall adherent low diffusion ladder flow air supply system for displacement ventilation
  • Overhead wall adherent low diffusion ladder flow air supply system for displacement ventilation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Air-conditioned room L (length) × B (width) × H (height) = 5.0m × 3.0m × 2.9m, the air supply system is installed above the wall of the room, the room heat source conditions are two people, two computers, one Printer, two lights. Total air volume 0.133m 3 / s, the installation angle of the drainage flap is 7°, and the inner velocity v of the attached trapezoidal flow 1 =0.60m / s, outside speed v 2 =0.46m / s, under the premise of meeting the requirements of thermal comfort standards, the indoor cooling load rate is 114W / m 2 , the corresponding ventilation efficiency value is: 1.78, which is 78% higher than the mixed ventilation efficiency.

Embodiment 2

[0025] Embodiment 2: The air-conditioned room, the layout of the air supply system, the heat source of the room, and the total air supply volume are the same as in Embodiment 1. The installation angle of the drainage flap is 17°, and the inner velocity v of the trapezoidal flow is attached 1 =0.68m / s, outside speed v 2 =0.38m / s, under the premise of meeting the requirements of thermal comfort standards, the indoor cooling load rate is 114W / m 2 , the corresponding ventilation efficiency value is: 2.04, which is 104% higher than the mixed ventilation efficiency.

Embodiment 3

[0026] Embodiment 3: The air-conditioned room, the layout of the air supply system, the heat source of the room, and the total air supply volume are the same as in Embodiment 1. The installation angle of the drainage flap is 27°, attached to the inner velocity v of the trapezoidal flow 1 =0.78m / s, outside speed v 2 =0.28m / s, under the premise of meeting the requirements of thermal comfort standards, the indoor cooling load rate is 114W / m 2 , the corresponding ventilation efficiency value is: 1.85, which is 98% higher than the mixed ventilation efficiency.

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Abstract

The invention discloses an overhead wall adherent low diffusion ladder flow air supply system for displacement ventilation, which comprises a box body (1) containing an air inlet channel, and an air inlet (10) and an air outlet shutter (4) which are arranged on a box body (1). The invention is characterized in that a current sharing orifice plate (2) is horizontally arranged at the lower part of the box body (1) and between the air inlet (10) and the air outlet shutter (4). The current sharing orifice plate (2) divides the box body (1) into an upper plenum box cavity (11) and a lower air supply box cavity in which a drainage folded plate (3) is arranged vertically between the current sharing orifice plate (2) and the air outlet shutter (4). The air supply system can effectively solve the problems of the displacement ventilation under installed air port arrangement form, realize the high ventilation efficiency of the air conditioner manner when a side wall overhead air port is arranged and give consideration to both traditional displacement ventilation and mixed ventilation.

Description

technical field [0001] The invention relates to an air supply system in the field of ventilation and air conditioning engineering, in particular to an upper wall-mounted low-diffusion trapezoidal flow air supply system for displacement ventilation. Background technique [0002] Displacement ventilation has high ventilation efficiency, and is currently recognized in the international heating, ventilation, air-conditioning and refrigeration (HVAC&R) industry as an air-conditioning method that can obtain better air quality and has energy-saving potential. However, the current problem with displacement ventilation (traditional displacement ventilation) is that the air supply device of this air-conditioning method is usually arranged in the lower part of the room. The limited area layout and the threat of wind feel lead to a low capacity to bear the cooling load of the room, and sometimes the air supply outlet is not allowed in the work area, which affects its wide application in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F13/06F24F13/075
Inventor 王智伟郭聪
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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