Green, environment-friendly and energy-saving passive ventilation method suitable for large public building

A ventilation method, a green and environmentally friendly technology, applied in data processing applications, CAD numerical modeling, special data processing applications, etc., can solve problems such as large energy consumption, violations, and lack of external environment connectivity, so as to avoid dependence and reduce energy consumption. consumption effect

Active Publication Date: 2021-03-09

TONGJI UNIV +1

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AI-Extracted Technical Summary

Problems solved by technology

Existing large-scale public buildings mostly use various mechanical equipment to control the indoor climate, forming a closed building space, lacking connection with the external environment, and unable to effectively use the natural environment, resulting in huge building energy consumption

[0004] The traditional method of using mechanical equipment to regulate the climate consumes a lot of energy, which is contrary to the current sustainable and green...

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Method used

As shown in Figure 29, comprehensive simulation result and analysis can draw, take the atrium space as the optimal combination mode of the large-scale building window scheme of typical element is to effectively utilize the louver exhaust on the atrium space, the windward direction enters the wind, Cooperate with multi-direction...

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Abstract

The invention discloses a green, environment-friendly and energy-saving passive ventilation method suitable for a large building, which comprises the following steps of: (a) establishing a physical model: simulating indoor and outdoor wind environments of the large building in software, and in order to reduce the number of grids under the condition of not influencing a result, neglecting fine parts of the building during modeling, enabling the atrium space to be located in the middle, enabling the functional areas to be arranged around, and for the external environment, keeping the size of anexternal flow field area being 6-8 times that of a building; (b) setting boundary conditions; (c) establishing a mathematical model: carrying out discrete solution by adopting a reforming normalized group (RNG) k-Epsilon epsilon model; (d) researching the characteristics of the outer wall shutter; and (e) carrying out data simulation analysis: through comparison experiment data of multiple openingcombination schemes, taking the upper part of the atrium space as an exhaust port, taking a windward door as an air inlet, and promoting effective ventilation of each area of the whole building by matching with air exchange ports in multiple directions.

Application Domain

Geometric CADData processing applications +3

Technology Topic

Physical modelPassive ventilation +8

Image

Examples

Experimental program(1)

Example Embodiment

[0058]The plurality of preferred embodiments of the present invention are described in the following reference to the description, making its technical content more clear and easy to understand. The present invention can be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments mentioned in the article.

[0059]Establish physical model and grid division

[0060]Take a large public building as an example, including museums and art gallery, its indoor and outdoor wind environment will simulate in the FLUENT fluid computing module in software ANSYS. Because of its complex structure, in order to reduce the number of grids, in the case of modeling, the construction of the building is ignored, and the modeling result is likefigure 1 As shown, the museum is three floors and three layers of art gallery. For external environments, in order to reduce reflux, the external flow field is maintained at 6 to 8 times the scale of the building scale.

[0061]Set border conditions and establish mathematical models

[0062]Meteorological parameters provided by "China Building Hot Environment Analysis Special Weather Data Set". The inlet wind speed adopts transition season wind speed (2.55m / s in this example). The exit is set to the pressure outlet. The ground roughness is taken according to the actual situation (0.22 m in this example). This invention mainly studies the three-dimensional state of the noncompressible gas in this building environment, which is discrete to discrete to the reforming regulatory group (RNG) K-ε model.

[0063]Exterior wall blinds special research

[0064]Exterior walls are exported to typical case analysis, the local size and overall environmental dimensional gap are too large. In order to increase the accuracy of the calculation, the present invention performs separate modeling of the outer wall of the wall, and studies its resistance characteristics, and the porous medium model is used instead of the blind window portion in subsequent calculations. Block-building constructionfigure 2 Indicated. On the loading of the inlet of the blinds, the pressure difference between the two ends of the louver model is status, and the "speed-pressure-resistant" curve formula of the exterior wall shutters is fitted.

[0065]Y = 1.87X2-0.0103X, the "speed-pressure drop" curve formula for the outer wall of the art galleries

[0066]Y = 58.311x2-0.0653X. Contrast the Darcy Law required for the setting of the porous media:

[0067] The permeability of the setting surface is obtained, the thickness Δm of the porous medium, and the pressure jump coefficient C.2.

[0068]Comparative and results simulation analysis of open portfolios

[0069]Option One:

[0070]The three-storey door and door on the three directions of the building are opened, and the louvery on the door and the two-side door is opened. The top exhaust port is opened, the upper part of the café is opened, such asimage 3 As shown, all open partsimage 3 Medium white tag.

[0071]Such asFigure 4 with5As shown, the 1.5M high wind speed is uneven, and most of the region wind speed is below 1.5 m / s. The wind speed in some areas is high, the highest wind speed is 3.35m / s, mainly in the wind direction. The air speed at the entrance is 1.5m / s or less, and the impact on personnel is not affected. Regional high pressure is affected by the shape of the building, and also appears in the wind direction.

[0072]Partial view of the three doorsFigure 6 : The maximum wind speed of the direction A is 3.26m / s, the average wind speed is 2.84m / s; the maximum wind speed of the direction B is 1.84m / s, the average wind speed is 0.86m / s; the maximum wind speed is 2.56m / s, the average wind speed is 1.35m / s.

[0073]The median internal wind speed slicing map showsFigure 7 : In the software statistics, the average speed of the top exhaain is 0.83m / s; there is turbulent flow in the interior of the inner court to be stronger. The overall venting amount is 101.65kg / s, the total ventilation is 2.86 times; welcome the wind direction (direction a) The high average speed of the pedestrian is large, affecting human comfort.

[0074]Option II:

[0075]The three-storey door in the three directions of the building is closed, the door on the door is opened, the one-layer door and the two-side door on the door open, the top exhaust port is opened, the upper part of the cafe rail is opened, seeFigure 8 Indicated.

[0076]Such asFigure 9 with10As shown, since the plan two closed three doors in three directions, natural wind mainly entered the door on the door, and the internal wind speed of the building is 1.5m / s or less. Regional high pressure is affected by the shape of the building, still appearing in the wind direction.

[0077]Partial diagram in the three door directions, seeFigure 11 : The statistics in the software statistics display direction A maximum wind speed is 2.76m / s, the average wind speed is 2.54m / s; the maximum wind speed of 1.54m / s, the average wind speed is 0.76m / s; the direction C highest wind speed is 1.86m / s, the average wind speed is 1.25m / s.

[0078]The median internal wind speed slicing chart show, seeFigure 12 : The statistical results show that the average speed of the top of the building is 0.77m / s, the whole medium is relatively weak, and the ventilation is 38.05kg / s, and the number of ventilation is 1.06 times / h. Insufficient ventilation in the middle court, less ventilation, affecting indoor air quality.

[0079]third solution:

[0080]The building is closed to (direction a), the door is closed, the remaining door and the doors are open, the one-story door and the two-side door open, the top exhaust port is opened, the two rows of ventilation, the upper part of the cafes railing, seeFigure 13 Indicated.

[0081]Such asFigure 14 with15As shown, since the wind direction door is closed, the 1.5m height of the building is relatively uniform, and the wind speed in the inner area is basically 1.5m / s or less. Regional high pressure is affected by the shape of the building, appearing in the wind direction.

[0082]Local map of the three doorsFigure 16 : In the software, the statistics display direction A maximum wind speed is 3.16m / s, the average wind speed is 2.82m / s; the direction B is 1.82m / s, the average wind speed is 0.83m / s; the direction C highest wind speed is 2.26m / s, the average wind speed is 1.21 m / s.

[0083]The median internal wind speed slice map showsFigure 17 : The statistical results show that the average speed of the top exhaust port of the building is 0.79m / s. The entire secondary turbulence is stronger close to the wind, and the rest is weaker. The amount of ventilation in the quarter is 81.84kg / s, the number of ventilation is 2.28 times / h, avoiding the problem of programs 1 to the door, the wind speed is too high, the programs are insufficient, and the air quality is difficult to guarantee.

[0084]Program 4:

[0085]The building is windy (direction a) 1, the two-layer door is closed, the remaining door and the doors are fully opened. The one-layer door and the two side doors are opened on the door, the top exhaust port is opened, and the two rows of ventilation ports, the coffee shop railing open, such asFigure 18 Indicated.

[0086]Such asFigure 19 with20As shown, since the two-layer door is closed, the 1.5m height of the building is more uniform, and the internal region wind speed is below 1.5 m / s. Regional high pressure is affected by the shape of the building, appearing in the wind direction.

[0087]Local map of the three doorsFigure 21 : In the software, the statistical results display direction A The maximum wind speed is 3.06m / s, the average wind speed is 2.78m / s; the maximum wind speed of 1.78 m / s is 1.78m / s, the average wind speed is 0.81m / s; the direction C highest wind speed is 2.14m / s, the average wind speed is 1.11 m / s.

[0088]The median internal wind speed slice map showsFigure 22 : The statistical results show that the average speed of the top exhaain is 0.78 m / s. The entire secondary turbulence is close to the wind, the remaining place is weak, and the air incentive is 65.69kg / s, and the number of ventilation is 1.83 times / h. The plan four-phase compared to the plan three, closed the second floor, the ventilation effect was weakened, so it is recommended that the windward season and the second-layer gate transition season should not close at the same time.

[0089]The comparison results of the four programs are shown in Table 1:

[0090]Table 1 comparison table of four regions

[0091]

[0092]

[0093]Simulation analysis of winding to door opening mode

[0094]Solution A

[0095]See the way to open the doorFigure 23. ResultFigure 24 with25As shown, when the winding door is opened, the remaining doors and windows are open, and the above-mentioned scenarios are referred to, and the internal 1.5m height is concentrated in the wind-moving gate, and the main in the two doors Strip, the highest wind speed is 4.12m / s, which has a great impact on pedestrians. The overall ventilation of the atrium is 91.2kg / s, which is reduced compared to the doorless state.

[0096]Solution B

[0097]See the way to open the doorFigure 26. ResultFigure 27 with28As shown, when the winding door opening mode is open to the inner side, the internal 1.5M height is divided into the scheme three, the highest wind speed is 3.89 m / s. The overall venting amount of the second quarter is 95.3kg / s, which has increased compared to the plan three.

[0098]to sum up

[0099]Such asFigure 29As shown, the integrated simulation results and analysis can be derived, the best combination of large-scale building opening schemes for typical spaces in the atrium space is to effectively utilize the ventricular space on the blind air, to the wind, with a multi-directional air exchange The mouth is promoted to promote the effective ventilation of the entire area of the building; while maintaining the way to open to the window to the inner side, the medium-court wind speed does not have an excessive or too small, maintaining the indoor thermal comfort environment to ensure the overall variety of buildings.

[0100]A preferred embodiment of the present invention is described in detail above. It should be understood that many modifications and variations can be made in accordance with the concept of the present invention without creative labor. Accordingly, technicians in the art will be within the scope of the claims by the claims by the claims by the technical solutions of the claims in accordance with the concept of the claims.

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