CN112303858A - Indoor micro-positive pressure control method - Google Patents
Indoor micro-positive pressure control method Download PDFInfo
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- CN112303858A CN112303858A CN202011195356.7A CN202011195356A CN112303858A CN 112303858 A CN112303858 A CN 112303858A CN 202011195356 A CN202011195356 A CN 202011195356A CN 112303858 A CN112303858 A CN 112303858A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0001—Control or safety arrangements for ventilation
- F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
- F24F2011/0004—Control or safety arrangements for ventilation for admittance of outside air to create overpressure in a room
Abstract
The invention relates to an indoor micro-positive pressure control method, which is characterized in that a plurality of indoor air inlet fans and an indoor exhaust fan are arranged indoors, corresponding exhaust outlets are arranged in the indoor space where the indoor air inlet fans are located, the sum of the air inlet amount of the indoor air inlet fans is greater than the exhaust amount of the indoor exhaust fan, and the control method comprises the following steps: acquiring and displaying outdoor wind direction data; acquiring and displaying a wind pressure coefficient C of a lower air outlet in the current wind directioni(ii) a When the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity; when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity; second air intakeThe quantity is greater than the first inlet air. The invention passes the wind pressure coefficient CiThe indoor and outdoor air pressure difference delta p and the indoor and outdoor air pressure difference change rate delta p' can effectively control the air quantity of the fresh air system, and effectively prevent external pollutants from entering the room.
Description
Technical Field
The invention relates to an indoor micro-positive pressure control method.
Background
With the rapid development of current economy and industry, air pollution in most areas of China is increasingly serious. Except for indoor formaldehyde, volatile gas pollution and the like which are troubled for a long time, haze becomes a focus topic of people in daily talk. In haze weather, the air is filled with a large amount of inhalable particulate matters, namely PM10 and PM2.5(PM10 and PM2.5 refer to fine particulate matters with the diameter of 10 microns or less and 2.5 microns in the atmosphere). Among them, PM2.5 can directly invade into human bronchioles and lung cells, directly affect the ventilation function of the lung, and make the organism easily in an anoxic state, so how to purify the air quality of the indoor space where people move for a long time becomes a central importance for ensuring the health of the whole people.
In the prior art, the scheme of indoor micro-positive pressure is adopted, and the phenomenon that outdoor air is sucked due to indoor negative pressure can be avoided. The existing fresh air system is not provided with a wind pressure regulating and controlling method, so that the air purifying effect is easily influenced by the difference between the internal air pressure and the external air pressure.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an indoor micro-positive pressure control method, a plurality of indoor air inlet fans and an indoor exhaust fan are arranged indoors, corresponding air outlets are arranged in the indoor space where the indoor air inlet fans are located, the sum of the air inlet volume of the indoor air inlet fans is greater than the air outlet volume of the indoor exhaust fan, and the control method comprises the following steps:
acquiring and displaying outdoor wind direction data;
acquiring and displaying a wind pressure coefficient C of a lower air outlet in the current wind directioni；
When the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity;
when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity;
the second air inlet amount is larger than the first air inlet amount.
The control method further comprises the micro-positive pressure setting step of:
according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake.
The control method further comprises the following steps:
calculating the indoor and outdoor air pressure difference delta p according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed;
and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p.
Calculating the change rate delta p' of the indoor and outdoor air pressure difference according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed;
setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference.
The control method also comprises the setting step of an air volume time sequence table:
setting a time sequence;
setting air quantities of a plurality of groups of air inlet fans and air outlet fans according to time in the time sequence;
and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan.
The utility model provides an indoor pressure-fired control system, indoor a plurality of indoor air inlet machines and an indoor exhaust fan of setting up, set up the air exit that corresponds at the indoor space at indoor air inlet machine place, the intake sum of indoor air inlet machine is greater than the air discharge capacity of indoor exhaust fan, control system includes:
the outdoor wind direction data acquisition and display unit is used for acquiring and displaying outdoor wind direction data;
wind pressure coefficient CiThe acquisition and display unit is used for acquiring and displaying the wind pressure coefficient C of the exhaust outlet in the current wind directioni；
An indoor air inlet machine air inlet amount setting unit for setting the air inlet amount of the indoor air inlet machine when the air pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity;
when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity; the second air inlet amount is larger than the first air inlet amount.
The control system also comprises a micro-positive pressure setting unit for setting indoor micro-positive pressure according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake.
The indoor air inlet machine air inlet volume setting unit specifically includes:
calculating the indoor and outdoor air pressure difference delta p according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed;
and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p.
The indoor air inlet machine air inlet volume setting unit specifically includes:
calculating the change rate delta p' of the indoor and outdoor air pressure difference according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed;
setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference.
The control system also comprises an air quantity time sequence table setting unit, wherein the air quantity time sequence table setting unit is used for setting air quantity data of a series of air inlet fans and air outlet fans, and sets air quantities of a plurality of groups of air inlet fans and air outlet fans according to time in the time sequence; and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan.
The invention passes the wind pressure coefficient CiThe indoor and outdoor air pressure difference delta p and the indoor and outdoor air pressure difference change rate delta p' can effectively control the air quantity of the fresh air system, and effectively prevent external pollutants from entering the room.
The above-described and other features, aspects, and advantages of the present application will become more apparent with reference to the following detailed description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic view of wind pressure of a high-rise building.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The external pressure at a particular component of the building envelope is:
hithe height of the assembly, measured from the lowest floor of the area;
g acceleration of gravity
TrefReference temperature 283K
TextOutdoor temperature, unit: k
Cp,iWind pressure coefficient of component "i
v wind speed.
And (3) calculating a wind pressure coefficient:
as shown in fig. 1, the wind pressure coefficient of a high-rise building at different monitoring points is very complicated. When the wind-resistant device is in the face wind position, the face wind position can have different wind pressure coefficients for wind at different angles. The wind pressure coefficient is a dimensionless parameter and is constant under the condition of given wind direction, buildings and building environment. The invention adopts three-dimensional CFD software airmark for simulating building ventilation to calculate the pressure of the building surface, and the calculation formula of the wind pressure coefficient is as follows:
wherein P is the building surface pressure generated by wind power, VrefTo a wind speed that agrees with the building roof height but does not exhibit turbulence. Through a modeling mode, the wind pressure coefficients of different monitoring points in different wind directions can be obtained through simulation.
The specific embodiment of the invention is as follows: an indoor micro-positive pressure control method is characterized in that a plurality of indoor air inlet fans and an indoor exhaust fan are arranged indoors, corresponding exhaust outlets are arranged in the indoor space where the indoor air inlet fans are located, the sum of the air inlet amount of the indoor air inlet fans is larger than the exhaust amount of the indoor exhaust fan, and the control method comprises the following steps: acquiring and displaying outdoor wind direction data; acquiring and displaying a wind pressure coefficient C of a lower air outlet in the current wind directioni(ii) a When the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity; when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity; the second air intake is larger than the first air intake. Through the wind pressure coefficient C of the air outlet of the buildingiThe display of the indoor air inlet machine can well set the air inlet volume of the indoor air inlet machine, when the indoor air inlet machine is positioned on the windward side, the air inlet volume can be properly increased, so that the entering of external air is reduced, and when the indoor air inlet machine is positioned on the leeward side, the air inlet volume can be properly reduced, so that the power consumption of the fan is reduced.
As a preferred embodiment, the control method further includes a micro positive pressure setting step of: according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake. Wind pressure coefficient C displayed by displayiThe user can judge that all air outlets are on the lee side, the space needing micro-positive pressure can exhaust air independently, and the user can reduce the difference between the sum of the air intake of the indoor air inlet fan and the air exhaust of the indoor air exhaust fan.
As a preferred embodiment, the control method further comprises calculating an indoor-outdoor air pressure difference Δ p according to outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed; and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p. In practical situations, the external pressure is calculated by the formula:
there is also an internal pressure outside the room, but for high-rise buildings it can be simply calculated as the aforementioned Δ p formula. Through the calculation of the delta p, the pressure condition of each air outlet can be approximately known, so that the air quantity is convenient to set by a user.
As a preferred embodiment, the indoor and outdoor air pressure difference change rate Δ p 'may also be calculated, and the indoor and outdoor air pressure difference change rate Δ p' may be calculated from the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed; setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference. The occurrence of gusts, due to gust conditions, is a result of air turbulence. When fluid flows over a solid surface while in motion, it encounters resistance from the solid surface, slowing the flow of the fluid. Air is a fluid, and when air flows through the ground, the lower layer wind speed is reduced and the upper layer is unchanged due to the resistance of the ground to the air, so that the air is disturbed. It not only advances, but also descends. Sometimes, in the direction of air flow, the air flow is blocked by obstacles such as hills, buildings and forests to generate backflowThis causes a number of irregular vortices which produce variations in the air flow velocity. For high-rise buildings, the scheme of the invention can better cope with gusts, thereby reducing the energy consumption of the fan. Due to the positive or negative deviation of the wind speed of the gust from its average value for a duration of not more than 2 min. The air quantity of the fan can be adjusted correspondingly according to the calculated delta p' aiming at the condition.
As a preferred embodiment, the control method further comprises an air volume time sequence table setting step: setting a time sequence; setting air quantities of a plurality of groups of air inlet fans and air outlet fans according to time in the time sequence; and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan. The time sequence table can be well adapted to the periodic air pressure change caused by the air gust, and the low air volume is adopted when the air pressure is low, so that the unnecessary energy consumption is reduced.
As another embodiment of the present invention, the present invention provides an indoor micro-positive pressure control system, wherein a plurality of indoor air intakes and an indoor exhaust fan are arranged indoors, corresponding exhaust outlets are arranged in an indoor space where the indoor air intakes are located, and the sum of the intake air volume of the indoor air intakes is greater than the exhaust air volume of the indoor exhaust fan, the control system comprises:
the outdoor wind direction data acquisition and display unit is used for acquiring and displaying outdoor wind direction data;
wind pressure coefficient CiThe acquisition and display unit is used for acquiring and displaying the wind pressure coefficient C of the exhaust outlet in the current wind directioni；
An indoor air inlet machine air inlet amount setting unit for setting the air inlet amount of the indoor air inlet machine when the air pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity;
when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity; the second air intake is larger than the first air intake.
As a preferred embodiment, the control system further comprises a micro-positiveA pressure setting unit for setting indoor micro-positive pressure according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake.
As a preferred embodiment, the indoor air inlet fan intake setting unit specifically includes:
calculating the indoor and outdoor air pressure difference delta p according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed;
and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p.
The indoor air inlet machine air inlet volume setting unit specifically includes:
calculating the change rate delta p' of the indoor and outdoor air pressure difference according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed;
setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference.
As a preferred embodiment, the control system further comprises an air volume time sequence table setting unit, wherein the air volume time sequence table setting unit is used for setting air volume data of a series of air inlet fans and air outlet fans, and setting air volumes of a plurality of groups of air inlet fans and air outlet fans according to time in a time sequence; and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan. Generally speaking, the wind speed change of gust has certain law, and the user can judge whether the room that the user located has the pressure-fired through judging indoor outer air quality, and when having the pressure-fired, indoor outer air quality should keep certain difference, if the time that the pressure-fired maintained is not enough, this air quality can be more close outdoor air quality, through this kind of judgement, can effectually discover which amount of wind time sequence table is more suitable for current outdoor wind speed. Specifically, an indoor and outdoor air quality preset difference value is set, when a user finds that the indoor and outdoor air quality difference value is higher than the indoor and outdoor air quality preset difference value, the current air volume time sequence table is kept, and when the user finds that the indoor and outdoor air quality difference value is lower than or equal to the indoor and outdoor air quality preset difference value, the other air volume time sequence table is replaced.
The setting of the air quantity time sequence table is mainly used for dealing with gust, and different air quantity time sequence tables are set according to the frequency and the air speed of the gust. Different air quantity time sequence tables can be selected through the frequency and the air speed of gusts.
The invention passes the wind pressure coefficient CiThe indoor and outdoor air pressure difference delta p and the indoor and outdoor air pressure difference change rate delta p' can effectively control the air quantity of the fresh air system, and effectively prevent external pollutants from entering the room.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and the description is given here only for clarity, and those skilled in the art should integrate the description, and the embodiments may be combined appropriately to form other embodiments understood by those skilled in the art.
Claims (10)
1. The indoor micro-positive pressure control method is characterized in that a plurality of indoor air inlet machines and an indoor exhaust fan are arranged indoors, corresponding air outlets are arranged in indoor spaces where the indoor air inlet machines are located, the sum of air inlet amounts of the indoor air inlet machines is larger than the air exhaust amount of the indoor exhaust fan, and the control method comprises the following steps:
acquiring and displaying outdoor wind direction data;
acquiring and displaying a wind pressure coefficient C of a lower air outlet in the current wind directioni；
When the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity;
when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity;
the second air inlet amount is larger than the first air inlet amount.
2. The indoor micro-positive pressure control method according to claim 1, further comprising a micro-positive pressure setting step of:
according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake.
3. The indoor micro positive pressure control method according to claim 1, further comprising:
calculating the indoor and outdoor air pressure difference delta p according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed; and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p.
4. The indoor micro-positive pressure control method according to claim 1, wherein an indoor and outdoor air pressure difference change rate Δ p' is calculated according to outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed;
setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference.
5. The indoor micro-positive pressure control method according to claim 4, further comprising an air volume time sequence table setting step of:
setting a time sequence;
setting air quantities of a plurality of groups of air inlet fans and air outlet fans according to time in the time sequence;
and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan.
6. The utility model provides an indoor pressure-fired control system, its characterized in that, indoor a plurality of indoor air inlet machines and an indoor exhaust fan of setting up, set up the air exit that corresponds at the indoor space at indoor air inlet machine place, the intake sum of indoor air inlet machine is greater than the exhaust volume of indoor exhaust fan, control system includes:
the outdoor wind direction data acquisition and display unit is used for acquiring and displaying outdoor wind direction data;
wind pressure coefficient CiThe acquisition and display unit is used for acquiring and displaying the wind pressure coefficient C of the exhaust outlet in the current wind directioni；
An indoor air inlet machine air inlet amount setting unit for setting the air inlet amount of the indoor air inlet machine when the air pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is negative, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set as a first air inlet quantity;
when the wind pressure coefficient C of the air outlet of the buildingiWhen the air inlet quantity is positive, the air inlet quantity of the indoor air inlet machine corresponding to the air outlet is set to be a second air inlet quantity; the second air inlet amount is larger than the first air inlet amount.
7. The indoor micro-positive pressure control system according to claim 6, further comprising a micro-positive pressure setting unit for setting the micro-positive pressure in the room according to the wind pressure coefficient CiThe difference between the sum of the air intake of the indoor air intake fan and the air exhaust of the indoor air exhaust fan is set for the positive value and the negative value and the size of the air intake.
8. The indoor micro-positive pressure control system of claim 6, wherein the indoor air inlet machine air inlet volume setting unit specifically comprises:
calculating the indoor and outdoor air pressure difference delta p according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference Δ p is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, v is the average wind speed;
and setting the air volume of the air inlet fan and the air outlet fan according to the indoor and outdoor air pressure difference delta p.
9. The indoor micro-positive pressure control system of claim 6, wherein the indoor air inlet machine air inlet volume setting unit specifically comprises:
calculating the change rate delta p' of the indoor and outdoor air pressure difference according to the outdoor wind speed data; the calculation formula of the indoor and outdoor air pressure difference change rate Δ p' is as follows:
where ρ is air density, g is gravitational acceleration, CiIs the wind pressure coefficient, n is the gust frequency, v is the average wind speed;
setting the air quantity of an air inlet fan and an air outlet fan in a time sequence according to the change rate delta p' of the indoor and outdoor air pressure difference.
10. The indoor micro-positive pressure control system according to claim 9, further comprising an air volume time sequence table setting unit for setting air volume data of a series of air inlet fans and air outlet fans, wherein in the time sequence, air volume of a plurality of groups of air inlet fans and air outlet fans is set according to time; and controlling the air quantity of the air inlet fan and the air outlet fan according to the time and the air quantity of the air inlet fan and the air outlet fan.
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| CN115122879A (en) * | 2022-06-08 | 2022-09-30 | 威海广泰空港设备股份有限公司 | Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport |
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| CN115122879A (en) * | 2022-06-08 | 2022-09-30 | 威海广泰空港设备股份有限公司 | Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport |
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