CN108811956A - A kind of trapezoidal greenhouse solar chimney ventilating system - Google Patents
A kind of trapezoidal greenhouse solar chimney ventilating system Download PDFInfo
- Publication number
- CN108811956A CN108811956A CN201810652785.9A CN201810652785A CN108811956A CN 108811956 A CN108811956 A CN 108811956A CN 201810652785 A CN201810652785 A CN 201810652785A CN 108811956 A CN108811956 A CN 108811956A
- Authority
- CN
- China
- Prior art keywords
- greenhouse
- air outlet
- air
- trapezoidal
- solar chimney
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
- A01G9/246—Air-conditioning systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/12—Technologies relating to agriculture, livestock or agroalimentary industries using renewable energies, e.g. solar water pumping
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Greenhouses (AREA)
Abstract
A kind of trapezoidal greenhouse solar chimney ventilating system, the indoor air inlet communicated including the outdoor air inlet of solar chimney, solar chimney lower end being arranged on the wall of greenhouse side and the upper end with wall sidewall upper；It meanwhile further including the exhaust outlet for the multiple air outlets of different sizes and greenhouse other side wall bottom being arranged at the top of greenhouse.The deficiency of heat in winter greenhouse greenhouse is compensated for by the air outlet at the top of indoor air inlet and greenhouse to hot wind is sent in canopy using the hot pressing effect of solar chimney, provides preferable growth microenvironment for fruits and vegetables.Make the Temperature Distribution in canopy more uniform by air port of different sizes, in addition, the air outlet of size variation can also make the reduction of blower stagnation pressure, reduces entire ventilating system energy consumption.
Description
Technical field
The present invention relates to the ventilating system that a kind of pair of greenhouse carries out increased winter temperature rising, specifically a kind of trapezoidal greenhouses
Solar chimney ventilating system.
Background technique
Greenhouse is a kind of important modern agriculture measure, while being also a complicated microenvironment ecosystem, because
This needs be suitable for make substance environment to adapt to its growth.Common greenhouse is frequently with the bone in bamboo-wood structure or steel construction
The artificial frame structure of film of one or more layers thermal insulation plastic film is covered with above frame.Identical as greenhouse effects, the film is at night
Prevent long-wave radiation in a large amount of canopy, material is thus formed independent greenhouse space make to have with night in the daytime in canopy it is good
Good temperature guarantee.In addition, outer membrane can effectively prevent the loss of carbon dioxide caused by fruits and vegetables respiration, promote
The photosynthesis of plant.Therefore, greenhouse can not be limited by outdoor climate conditions, and artificial creation is suitable for fruits and vegetables growth
Moist heat can adjust fruits and vegetables production season, promote fruits and vegetables counter-seas on production.However, under cold weather conditions, due to normal
Rule cover film is relatively thin, and thermal coefficient is big, and heat dissipation in canopy is caused comparatively fast, it is raw to be in most cases unable to reach fruits and vegetables in canopy in winter
Long required temperature range.
Currently, heat loss is reduced to the solution of the above problem is the additional insulating layer of covering mostly, to cover straw mat
For usual way.But cover these opaque materials not only and can reduce incident solar radiation in the daytime, and will affect plant into
Row photosynthesis reduces so as to cause temperature of shed simultaneously, and plant growth receives inhibition.In addition, the knot of conventional greenhouse
Structure feature is that length is longer, and solar radiation is unevenly distributed sooner or later, so that heat is uneven along greenhouse distribution of lengths, causes fruits and vegetables in canopy
The heated difference in vitellarium, to influence the quality of its growth.
Summary of the invention
In view of the drawbacks of the prior art and insufficient, the object of the present invention is to provide a kind of trapezoidal greenhouse solar energy
Chimney draft system.
To realize above-mentioned technical assignment, the present invention, which adopts the following technical solutions, to be achieved：
A kind of trapezoidal greenhouse solar chimney ventilating system, including be arranged on greenhouse wall solar chimney,
The interior that the outdoor air inlet of solar chimney lower end and solar chimney upper end are communicated with greenhouse wall sidewall upper
Air inlet, which is characterized in that at least provided with two air outlets at the top of greenhouse, the wind outlet sectional area of air outlet from interior into
To far from being sequentially increased at indoor air inlet at air port, air outlet connects blower；Greenhouse other side wall bottom is equipped with row
Air port, air outlet are parallel to setting at the top of greenhouse, the cross sectional shape of air outlet and the section at the top of corresponding greenhouse
Shape is consistent, the air outlet be it is trapezoidal, the half of the sum of long side and short side is defined as air port side length or air outlet is terraced
The optimization structure of shape, optimization structure sideline are overlapped with temperature isopleth.
For air outlet in addition to the 6th air outlet, the side equation of the short bottom edge contour line optimization structure of remaining air outlet is as follows：
In formula：X, y is respectively greenhouse internal coordinate, m；x0=-124404, yc=0.00145, w=582, A=124415.
Air outlet is integrally connect with a telescopic load carrier.
Air outlet shares 9, they are along greenhouse length direction in three column arrangements, the outer dimension of each column inner wind outlet
Identical, the outer dimension of adjacent column air outlet is different.
The relationship of three column air outlet side lengths is as follows, i.e.,
In formula,l 1,l 2,l 3The respectively side length of the first, second and third column air outlet.
First, second, third column air outlet side length is respectively 400mm, 500mm and 750mm.
Air outlet is whole under load carrier drive can lower movement in the vertical direction.
First row air outlet centre distance solar chimney air outlet is 2L/15, remaining air outlet column pitch is arranged at 4L/15
It arranges, the spacing of each air outlet is W/5 in each column, wherein L indicates the height on the trapezoidal long bottom edge in trapezoidal greenhouse bottom surface.That is greenhouse
Length, W indicate the trapezoidal long bottom edge in trapezoidal greenhouse bottom surface, i.e. greenhouse width.
First row air outlet, secondary series air outlet, third column air outlet center away from indoor air inlet 3 be respectively 2m, 6m,
10m；The spacing of each air outlet is 3m in each column, and the mounting height of air outlet is 9.5m.
The air supply velocity of first row air outlet is：
The air supply velocity of the secondary series air outlet is：
The air supply velocity of the third column air outlet is：
In formula,v 1,v 2,v 3Respectively the first, second and third column air outlet air supply velocity,l 1,l 2,l 3Respectively first, second and third column
The side length of air outlet.
Compared with the existing technology, beneficial effects of the present invention：
The present invention is directed to be greenhouse air-supply by solar chimney effect, with supplement under cold season outdoor climate conditions
The heat loss of greenhouse reduction, while the uniform heat distribution degree that plant growth takes is improved, and then realize greenhouse inner ring
Border control.
1, the present invention uses passive solar energy technology, guarantees the microenvironment that fruits and vegetables are grown under cold conditions in winter, with
It is suitble to its normal growth in winter.In addition, the present invention uses clean renewable energy solar energy, heating canopy is driven using hot pressing
Interior air can greatly save the energy and power consumption compared with using traditional energy.
2, to guarantee that fruits and vegetables growth district is heated evenly in canopy, the present invention is arranged of different sizes more along canopy length direction
A trapezoid air outlet, the total amount of heat for guaranteeing that each column air port is sent out are consistent.And combine greenhouse inner blower open height position section
Temperature field, the shape sideline of air outlet is optimized, side equation, the more original air port pair in the air port of optimization are established
Solve the problems, such as that temperature is uneven with more superiority along greenhouse distribution of lengths.
3, the growth of fruits and vegetables is not only influenced by temperature, while also by air speed influence.In the present invention, to guarantee temperature field
Uniformity, air outlet of different sizes is set in greenhouse length direction.Compared with using the air outlet of same size, using not
The total output needed with the blower of the air outlet power drive vertical fluid of size reduces, and realizes the energy-saving of ventilating system.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is main view of the present invention；
Fig. 3 is side view of the present invention；
Fig. 4 is top view of the present invention；
Fig. 5 is that air outlet of the present invention sets layout drawing；
Fig. 6 is Ball shape nozzle of the present invention and trapezoidal air outlet axis speed figure；
Fig. 7 is air outlet mounting height Temperature Distribution of the present invention；
Fig. 8 is the present invention without air outlet facade velocity contour；
Fig. 9 is that the present invention increases air outlet facade velocity contour；
Figure 10 is the trapezoidal air outlet temperature distribution of contours figure of the present invention；
Figure 11 is the trapezoidal air outlet optimization structure temperature distribution of contours figure of the present invention；
Figure 12 is that whether there is or not workspace temperature profiles under air outlet operating condition.
Figure acceptance of the bid scores and is not：1, outdoor air inlet；2, solar chimney；3, indoor air inlet；4, air outlet；5, air draft
Mouthful；6, load carrier；X, the short transverse on the bottom edge of the length direction or air outlet of greenhouse；Y, the width direction or air-supply of greenhouse
The bottom edge direction of mouth.
Specific embodiment
With reference to the accompanying drawing and its present invention is discussed in detail in specific embodiment.
As shown in Fig. 1-Figure 12, main thought of the invention is：Using solar chimney draught principle, by big in greenhouse
Canopy side（Left side in Fig. 1）Solar chimney is built on wall, and outdoor air inlet, indoor air inlet and exhaust outlet are set, this
Kind of mode according to the Natural Ventilation Principle under hot pressing function, using solar radiation to the density contrast generated in solar chimney as air
Radiant heat energy is converted aerodynamic energy by the driving force of flowing, to increase air pressure head and exhaust air rate, and heated air is sent into
Chimney top is sent directly into inside greenhouse by indoor air outlet 3.Above scheme is deposited due to jet stream in greenhouse length direction
There are vertical decrease in level decaying and greenhouse short transverse, thus the present invention at the top of the greenhouse along its length on,
According to air outlet vertical temperature-difference jet axis speed, provided with different size of multiple trapezoidal air outlets, while determining different
The pressure of air outlet, and air outlet 4 is optimized in conjunction with canopy temperature field, to guarantee to be sent out downwards by air outlet 4
Hot-fluid heat it is identical, realize greenhouse micro environment control uniformity.
Referring to Fig. 1, the present invention provides a kind of trapezoidal greenhouse solar chimney ventilating systems, including are arranged in greenhouse
The outdoor air inlet 1 of solar chimney 2,2 lower end of solar chimney on the wall of greenhouse side and the upper end and wall side wall
The indoor air inlet 3 that upper end communicates；It meanwhile further including multiple 4 Hes of air outlet of different sizes being arranged at the top of greenhouse
The exhaust outlet 5 of greenhouse other side wall bottom.
The characteristics of above-mentioned technical proposal using solar chimney hot pressing by being driven, the hot-air of solar energy heating is passed through
Solar chimney is sent into greenhouse, and various sizes of square air outlet 4, air outlet and big shed top surface are arranged at the top of greenhouse
It is similar, so that air-supply mouth-shaped and Indoor Flow Field is coincide, is conducive to reduce disturbance of the air-supply to air-flow, raising uniformity of temperature profile
Property, while the blower for controlling air outlet 4 is blown using different air supply velocities into canopy, in the wind speed requirement for meeting fruits and vegetables vitellarium
While the blower total output that makes reduce, different air outlet sizes also ensures that cold season is sent into heat in greenhouse chamber
Uniformity.Therefore, above-mentioned technical proposal utilizes the hot pressing effect of solar chimney, at the top of indoor air inlet 3 and greenhouse
Air outlet 4 compensates for the deficiency of heat in winter greenhouse greenhouse to hot wind is sent in canopy, provides preferable growth micro-loop for fruits and vegetables
Border.
The present invention according to《Greenhouse heating system construct and design specification》, as follows to the design of solar chimney 2：It determines first
The air capacity for needing to heat, i.e., the volume and rate of ventilation product in the required greenhouse heated.Rate of ventilation of the present invention is pressed《Greenhouse adds
Hot systems construct and design specification》Take 1 time/h.For guarantee sun wall system initial cost economy, and can obtain it is higher add
Hot temperature generally takes 30~50m in the air capacity for selecting unit area solar wallboard to pass through3/h·m2.Therefore, according to above
Data are logical to determine the usable floor area of solar wallboard, solar wallboard area=needs processing air capacity/unit area solar wallboard
The air capacity crossed.
Preferably, the air outlet 4 shares 9, is mounted at the top of greenhouse by load carrier 6, and load carrier 6 is adopted
Use frame body.
Through testing, 9 air ports make the heat distribution in canopy more uniform；9 air ports have been able to meet microenvironment in canopy
It is required that.
For fruits and vegetables normal growth in canopy under guarantee in winter cold conditions, emphasis is above-mentioned multiple air outlets of different sizes
4, as a whole to the micro environment control carried out in canopy, generate the high hot-fluid of uniformity.The present invention is determined by following procedure
The optimization of each air outlet air supply velocity, outlet air heat and outlet style.
1, the determination of the air supply velocity of air outlet, outlet air heat
Firstly, the axis speed of isothermal jet is represented by following form：
Formula（1）In：
v 0 Air outlet wind speed, m/s；
v m Isothermal jet axis speed, m/s；
A- turbulence factor, circular nozzle 0.08, slit spout are 0.11 ~ 0.12；
S- plasma jet range length, m；
R0Air-supply port radius or equivalent radius, m；
In present invention, it is desirable to calculating non-isothermal jet axis speed, the derivation of calculation formula is built upon the former Soviet Union
R.H. on the basis of the obtained related research achievement of A Bola Abramovich, when jet stream is there are when temperature difference, non-isothermal difference jets
A buoyancy item because of caused by fluid density contrast more than isothermal jet.Therefore, the Air Temperature as caused by solar energy heating plate
Difference has the acceleration a risenm：
Formula（2）In：
amAir-flow climb acceleration（m/s2 ）；
T i -Jet stream isiAbsolute temperature at column air-supply air outlet, K；
THAbsolute temperature of the jet stream at the 0.1H height of vitellarium, K；
ΔT0-=T i -TH- theiThe jet stream temperature difference, K at column air outlet；
G- acceleration of gravity, m/s2。
When jet stream is there are when temperature difference, non-isothermal difference jets more than isothermal jet one because of caused by fluid density contrast
Buoyancy item, therefore, it is necessary to isothermal jet axis speedIt is modified.For non-isothermal jetIf its axis speed
Knots modification, for the jet stream that direction is downward, the acceleration of the jet stream is, when peer-to-peer two sides carry out
Between integrate the calculating formula of available temperature difference circular jet axis speed vertically downward：
For trapezoidal air port, when the ratio between the long side in its air port and short side are no more than 3:1, jet stream at this time can be quickly from trapezoidal development
For circle, then handled according to Circular Jet；It, should be with the equivalent radius in trapezoidal air port when air port is trapezoidalIt substitutes into
It is calculated in the calculating formula of Circular Jet, is trapezoidal side length, the half of the sum of trapezoidal long side and short side is defined as trapezoidal side length.Most
The whole axis speed of Heated Jets vertically downward is expressed as form：
For formula（4）The determination of middle turbulence factor a compared by carrying out experiment test under isothermal jet operating condition using circle
Shape spout and use Novel series air port jet axis speed proposed by the present invention, as shown in Figure 6.It consults《Practical heat supplying air conditioning
The design manual second edition》It is found that the turbulence factor of cylindrical spout is 0.08, series proposed by the present invention can be released according to Fig. 6
Turbulence factor value corresponding to air port is taken as 0.14.Therefore（4）Formula can be modified to：
There are certain coupled relations between three column air port of the present invention, can not independently solve, in order to determine the air-supply speed of air outlet
Degree still needs to predefine the temperature difference at air-supply open area and air port with vegetable growth section.According to air outlet regular size size,
In conjunction with the change of temperature field of greenhouse length direction, in 0.95H（H indicates greenhouse height）9 differences are set at height
The trapezoidal air outlet 4 of side length（See Fig. 1）, and pressure fan is installed for them.4 are arranged in the side apart from solar chimney 2 to send
Air port, each column reduces one thereafter, arranges three column altogether.First row air outlet is based on hoisting safety and air-supply uniformity considers,
Setting is being spaced 4L/15 arrangement between indoor air inlet 2L/15 (L indicates greenhouse length), remaining air outlet, each column
Spacing is W/5 between air outlet（W indicates greenhouse width）Arrangement, as shown in Figure 5.
It is determined each column air port individually below and goes out wind velocity：
（1）Determine first row air port goes out wind velocity：
Numerical Simulation is carried out to Indoor Flow Field of the greenhouse using solar chimney in the case where no air supply device,
Obtain the thermo parameters method in greenhouse；The cross-section temperature field cloud atlas at air outlet mounting height along greenhouse length direction is intercepted, is obtained
To the Poly curve distribution pattern met in Polynomial function along the temperature distributing rule of greenhouse length direction, function table
It is up to formula：
In formula：X is position coordinates of the air outlet along greenhouse length direction（Direction is from indoor air outlet 3 to exhaust outlet 5）, m；L
For greenhouse length, m；T1The absolute temperature along greenhouse length direction, K；
By formula（6）In T1Formula is substituted into as absolute temperature of the jet stream at air outlet（5）, obtain the jet axis in workspace
Speed：
It is calculated by the Indoor Flow Field Numerical Simulation in the case where no air supply device, obtains the weighting at the 0.1H height of workspace
Mean temperature TH, it is taken as 307.7K；And according to the requirement in greenhouse for workspace wind speed, penetrating at the height of workspace
Flow axis speedIt is taken as 1m/s, first row scenery resource quality is at 2L/15（That is x takes 2 L/15）, utilize formula（7）, calculate
Go out wind velocity v at first row air outlet1, specific to indicate such as formula 8：
Arrange that air outlet need to reach the requirement of balanced ventilation, in greenhouse in order to send out the air outlet of different installed positions
Heat reaches uniformly, i.e. the air-supply heat flow of different location air outlet is identical, then need to design different sizes along greenhouse length direction
The air outlet of size, to guarantee that canopy temperature field distribution is uniform.According to heat Calculation formula, obtain sending at first row air outlet
The calculating formula of wind-heat amount：
In formula：C- specific heat capacity, J/kg K；
M- air-supply quality, kg；
Supply air temperature difference, K；
ρ-atmospheric density, kg/m3；
l1First row air outlet side length, m；
v1First row air outlet wind speed, m/s;
THAbsolute temperature of the jet stream at the 1m height of workspace, K；
Position coordinates of the x- air outlet along greenhouse length direction, m；
L- greenhouse length, m.
（2）Determine secondary series air port goes out wind velocity：
Numerical simulation mould is carried out to Indoor Flow Field of the greenhouse using solar chimney when being disposed with first row air outlet
It is quasi-, obtain the Temperature Distribution in greenhouse.And the Temperature Distribution at air outlet mounting height in the x-direction is extracted, it obtains long along greenhouse
The temperature distributing rule in degree direction meets the Poly curve distribution pattern in Polynomial function, and function expression is：
In formula：X is the position coordinates along greenhouse length direction, m；L is greenhouse length, m.
By formula（10）In T2As absolute temperature of the jet stream at air outlet, formula is substituted into（5）, obtain penetrating in workspace
Flow axis speed：
Formula（11）In, workspace 0.1H height is calculated by the Indoor Flow Field Numerical Simulation in the case where no air supply device
The weighted mean T at placeH, it is taken as 307.7K；And according to the requirement in greenhouse for workspace wind speed, in workspace
Jet axis speed at heightIt is taken as 1m/s, secondary series air outlet is arranged at 2L/5（I.e. x takes 2L/5）, by（11）Formula meter
It calculates and obtains going out wind velocity v at secondary series air outlet2, as shown in Equation 12：
Arrange that air port need to reach the requirement of balanced ventilation, in greenhouse for the heat for sending out the air outlet of different installed positions
Amount reaches uniformly, i.e. the air-supply heat of different location air outlet is identical, and the present invention is big along the different sizes of greenhouse length direction design
Small air outlet, to guarantee that canopy temperature field distribution is uniform.According to the air-supply at first row air outlet and secondary series air outlet
Heat is equal, can obtain：
In formula：
C- specific heat capacity, J/kg K；
M- air-supply quality, kg；
ρ-atmospheric density, kg/m3；
l1First row air outlet side length, m；
l2Secondary series air outlet side length, m；
v1First row air outlet wind speed, m/s;
v2Secondary series air outlet wind speed, m/s;
THAbsolute temperature of the jet stream at the 1m height of workspace, K；
Position coordinates of the x- air outlet along greenhouse length direction, m；
L- greenhouse length, m.
Solution formula（13）, can obtain secondary series air outlet side length l2, as shown in Equation 14：
Thus it obtains meeting along greenhouse length direction different location, under guaranteeing that air-supply heat is identical, between different air ports sizes
Corresponding relationship.
（3）Determine third column air port goes out wind velocity：
It is imitative that numerical value is carried out to Indoor Flow Field of the greenhouse using solar chimney when being disposed with the first, second column air outlet
True simulation, obtains the thermo parameters method in greenhouse.And the section temperature distribution at air outlet mounting height in the x-direction is extracted, it obtains
To the Slogistic1 curve distribution met in Growth/Sigmoidal function along the temperature distributing rule of greenhouse length direction
Pattern, function expression are：
In formula：X is the position coordinates along greenhouse length direction, m；L is greenhouse length, m.
It will（15）T in formula3As absolute temperature of the jet stream at air outlet, substitute into（5）Formula can be obtained in workspace
Jet axis speed calculation formula, as follows：
Formula（16）In, workspace 0.1H height is calculated by the Indoor Flow Field Numerical Simulation in the case where no air supply device
The weighted mean T at placeH, it is taken as 307.7K；And according to the requirement in greenhouse for workspace wind speed, in workspace
Jet axis speed at heightIt is taken as 1m/s, third column air outlet is arranged at 2L/3, therefore x value is 2 L/3, by
（16）Formula, which is calculated at third column air outlet, goes out wind velocity v3, concrete form is as shown in Equation 17：
Arrange that air port need to reach the requirement of balanced ventilation, in greenhouse for the heat for sending out the air port of different installed positions
Reach uniformly, the air outlet of different sizes need to be designed, along greenhouse length direction to guarantee that canopy temperature field distribution is uniform.
It is equal with the air-supply heat at third column air outlet according to first row air outlet, it can obtain：
In formula：
C- specific heat capacity, J/kg K；
M- air-supply quality, kg；
ρ-atmospheric density, kg/m3；
l1First row air outlet side length, m；
l3Third column air outlet side length, m；
v1First row air outlet wind speed, m/s;
v3Third Russia air outlet wind speed, m/s;
THAbsolute temperature of the jet stream at the 1m height of workspace, K；
Position coordinates of the x- along greenhouse length direction, m；
L- greenhouse length, m.
Solution formula（18）, can obtain third column air outlet side length l3, as shown in Equation 19：
Thus it obtains meeting along greenhouse length direction different location, under guaranteeing that air-supply heat is identical, between different air ports sizes
Corresponding relationship.
So far, the calculating formula of revised vertical temperature-difference jet axis speed according to the present invention, has obtained the speed of air outlet
Degree distribution.The method for using recursion simultaneously, in conjunction with temperature field of solar chimney greenhouse in the case where no air outlet 4 point
Cloth releases the latter air outlet parameter from previous air outlet parameter, final to determine along greenhouse length direction different location air port
Functional relation between size, balanced draft heat realize balanced ventilation.
The optimization of air outlet form
According to the flow-pressure characteristic curve of blower it is found that air outlet speed and pressure fan pressure are there are certain functional relation,
And then jet flow can be calculated according to jet velocity and jet stream area of section, to calculate the pressure at air outlet.In addition, this hair
It is bright that also air outlet wind speed, pressure have been determined in situation, in conjunction with flow field temperature distributing characteristic, air outlet form is improved.
The specific method is as follows：
Firstly, not arranging 4 operating condition of air outlet progress Numerical Simulation to the greenhouse using solar chimney, obtain big
Thermo parameters method in canopy extracts the Temperature Distribution cloud atlas at 4 mounting height of air outlet.By Temperature Distribution cloud atlas it is found that sending
At 4 arrangement of air port, there are biggish temperature gradient, each temperature isopleth to show the identical regularity of distribution in entire temperature field,
A wherein progress data fitting is chosen, the isothermal regularity of distribution of each item is obtained and meets Origin basic function letter
The distribution pattern of GuassAmp curve in number, function expression such as formula（20）It is shown：
In formula：X, y is respectively greenhouse internal coordinate, and coordinate origin is in the wall bottom centre being connected with solar chimney, and wherein x is square
To the vertex for being directed toward exhaust outlet from trapezoidal bottom edge one end, obliquely along bottom edge direction, z positive direction vertically faces direction directly to y positive direction
Upwards, other constant term parameters are x0=-124404, yc=0.00145, w=582, A=124415, in addition to the 6th air outlet is constant,
The long bottom edge of remaining air outlet is constant, and short bottom edge optimization, the sideline coordinate of optimization meets expression formula（20.）
According to formulaCalculate the air-supply heat of each air outlet, whereinIt is average for temperature weighted at air outlet
The difference of temperature weighted average value in value and workspace.As shown in Figure 7, temperature gradient is larger at air outlet, after leading to length direction
Each column supply air temperature in face constantly reduces the temperature difference increase so that with vitellarium, eventually causes air output increase.To reduce energy consumption, drop
Low fan noise saves operating cost, will be described in air outlet edge line and formula 20 etc. under the premise of guaranteeing that air-supply heat is constant
Warm line is overlapped, and is improved its weighted area supply air temperature, is also reduced air outlet size while reducing the air output of single air outlet,
Realize blower consumption reduction, the dual-effect energy-saving of air port consumptive material reduction.
Preferably, under greenhouse length direction is in a manner of three column arrangements totally 9 air outlets, first row is blown
Mouth, secondary series air outlet, third column air outlet are respectively 2m, 6m, 10m apart from indoor air inlet 3；Between each column inner wind outlet 4
Away from for 3m；The mounting height of air outlet 4 is 9.5m, as shown in Figure 5.
Preferably, air outlet 4 is all made of trapezoidal, and the half of the sum of trapezoidal long side and short side is defined as its side length.It is preferred that
, the side length of the first, second and third column air outlet is respectively 400mm, 500mm and 750mm.
Different in order to adapt to the different growth phase growing height of crop, all air outlets 4 can integrally along the vertical direction
It is moved up and down in a certain range, the 0-0.5H of lower section at mobile range 0.95H.Specifically, using that can be stretched in vertical direction
The load carrier 6 of contracting, it is preferred that can be mounted on by load carrier and by multiple telescopic rods in the lower section of greenhouse top plate.
The telescopic rod, which can be used to manually control to stretch or automatically control, to be stretched, and under this mode, can be driven and is mounted on load carrier 6
It moves up and down in a certain range along the vertical direction, the distance so as to adjust air outlet 4 relative to crop, to adapt to crop difference
Growth phase in different growing height.
Embodiment：
The trapezoidal long side of trapezoidal greenhouse and short side are respectively 15m and 5m in the present embodiment（Width direction）, a length of 15m, height
10m.Greenhouse volume 1500m3, rate of ventilation according to《Greenhouse heating system construct and design specification》Take 1 time/h, therefore solar panels
Size be divided by obtain 1500m3/h according to greenhouse volume and rate of ventilation.According in summary of the invention to different location air port side length
Functional relation derivation, i.e.,, blown in the present embodiment using trapezoidal air port, preset the
The side length l in one column air port1It for 400mm, then can be obtained according to the functional relation of different location air port side length, second, third column wind
The side length of mouth is respectively 500mm, 750mm.Optimize inlet shape simultaneously to be allowed to be overlapped with thermoisopleth, air port outer edge curve meets
The distribution pattern of GuassAmp curve in Origin basic function function, function tabular form, which reaches, is：
In formula：X, y is respectively greenhouse internal coordinate, x0=-124404, yc=0.00145, w=582, A=124415.
Effect of blowing in the present embodiment is shown in Fig. 8 and Fig. 9, can be seen that from Fig. 8 and Fig. 9 when being fitted without air supply device,
Speed is smaller in workspace, and canopy internal upper part heat cannot be effectively delivered in workspace, raw without enough heats supply vegetables
It is long.After increasing air supply device, greenhouse top hot-air quickly enters workspace, provides preference temperature for vegetables, and then be fruits and vegetables
Create a suitable growth microenvironment.As seen from Figure 12, when not having air supply device, the Temperature Distribution in workspace is not
Uniformly, there is apparent temperature gradient in greenhouse middle position, maximum temperature difference reaches 3 DEG C, increases two sides temperature after air supply device
Field distribution is more uniform, and temperature gradient is smaller in entire workspace, and two sides maximum temperature difference is reduced to 2 DEG C in canopy, can be effectively improved
Temperature distribution evenness in workspace, the normal growth of fruits and vegetables during guarantee winter.Simultaneously to meet power conservation requirement, by changing
Pick-up tuyere device form is allowed to consistent with thermoisopleth trend, as shown in Figure 10 and Figure 11.Temperature gradient at former scenery resource quality
It is larger, reduce supply air temperature, air outlet supply air temperature improves after changing shape, is guaranteeing the identical situation of air port air-supply heat
Under, air output can be reduced, to reach energy saving purpose.It can be seen that in the present embodiment, add solar chimney and air outlet
Heat can be effectively delivered to workspace forward position by device quickly, and air outlet size constantly changes along its length, can be protected
It is consistent to demonstrate,prove each air outlet air-supply heat, so that temperature of shed is evenly distributed.In addition, the air outlet of size variation can also make blower
Stagnation pressure reduces, and reduces entire ventilating system energy consumption.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without depart from that overall concept of the invention, several changes and improvements can also be made, these also should be considered as of the invention
Protection scope.
Claims (10)
1. a kind of trapezoidal greenhouse solar chimney ventilating system, including the solar energy cigarette being arranged on greenhouse wall
What chimney, the outdoor air inlet of solar chimney lower end and solar chimney upper end were communicated with greenhouse wall sidewall upper
Indoor air inlet, which is characterized in that at least provided with two air outlets at the top of greenhouse, the wind outlet sectional area of air outlet is from room
For interior air inlet to far from being sequentially increased at indoor air inlet, air outlet connects blower；Greenhouse other side wall bottom is set
There is an exhaust outlet, air outlet is parallel to setting at the top of greenhouse, and the air outlet is trapezoidal, the half of the sum of long side and short side
It is defined as air port side length or air outlet is trapezoidal optimization structure, optimization structure sideline is overlapped with temperature isopleth.
2. trapezoidal greenhouse solar chimney ventilating system as described in claim 1, which is characterized in that the air outlet removes
Outside 6th air outlet, the side equation of the short bottom edge contour line optimization structure of remaining air outlet is as follows：
In formula：X, y is respectively greenhouse internal coordinate, m；x0=-124404, yc=0.00145, w=582, A=124415.
3. trapezoidal greenhouse solar chimney ventilating system as described in claim 1, which is characterized in that the air outlet is whole
Body is connect with a telescopic load carrier.
4. trapezoidal greenhouse solar chimney ventilating system as described in claim 1, which is characterized in that the air outlet is total
There are 9, along greenhouse length direction in three column arrangements, the outer dimension of each column inner wind outlet is identical for they, adjacent column air-supply
The outer dimension of mouth is different.
5. trapezoidal greenhouse solar chimney ventilating system as claimed in claim 2, which is characterized in that the three column air-supply
The relationship of mouth side length is as follows, i.e.,,
In formula,l 1,l 2,l 3The respectively side length of the first, second and third column air outlet.
6. trapezoidal greenhouse solar chimney ventilating system as claimed in claim 3, which is characterized in that described first, the
Two, third column air outlet side length is respectively 400mm, 500mm and 750mm.
7. trapezoidal greenhouse solar chimney ventilating system as described in claim 1, which is characterized in that the air outlet exists
Load carrier drives lower entirety can lower movement in the vertical direction.
8. trapezoidal greenhouse solar chimney ventilating system as claimed in claim 2, which is characterized in that first row air outlet
Centre distance solar chimney air outlet is 2L/15, remaining air outlet column pitch is arranged at 4L/15, each air outlet in each column
Spacing is W/5, wherein L indicates that the height on the trapezoidal long bottom edge in trapezoidal greenhouse bottom surface, i.e. greenhouse length, W indicate trapezoidal greenhouse bottom
The trapezoidal long bottom edge in face, i.e. greenhouse width.
9. trapezoidal greenhouse solar chimney ventilating system as claimed in claim 7, which is characterized in that first row air-supply
Mouth, secondary series air outlet, third column air outlet center are respectively 2m, 6m, 10m away from indoor air inlet 3；Each air outlet in each column
Spacing is 3m, and the mounting height of air outlet is 9.5m.
10. trapezoidal greenhouse solar chimney ventilating system as described in claim 1, which is characterized in that the first row
The air supply velocity of air outlet is：
The air supply velocity of the secondary series air outlet is：
The air supply velocity of the third column air outlet is：
In formula,v 1,v 2,v 3Respectively the first, second and third column air outlet air supply velocity,l 1,l 2,l 3Respectively first, second and third column are sent
The side length in air port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810652785.9A CN108811956A (en) | 2018-06-22 | 2018-06-22 | A kind of trapezoidal greenhouse solar chimney ventilating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810652785.9A CN108811956A (en) | 2018-06-22 | 2018-06-22 | A kind of trapezoidal greenhouse solar chimney ventilating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108811956A true CN108811956A (en) | 2018-11-16 |
Family
ID=64138091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810652785.9A Withdrawn CN108811956A (en) | 2018-06-22 | 2018-06-22 | A kind of trapezoidal greenhouse solar chimney ventilating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108811956A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090104867A1 (en) * | 2007-10-22 | 2009-04-23 | Sherman John F | Building aperture mounted ventilation apparatus |
| CN201421152Y (en) * | 2009-03-25 | 2010-03-10 | 黄仕友 | Room non energy-consuming ventilation device |
| CN202179004U (en) * | 2011-07-05 | 2012-04-04 | 东北石油大学 | Ventilating device for agricultural greenhouse |
| CN204757235U (en) * | 2015-07-07 | 2015-11-11 | 王峰 | Cleaning type heating and ventilation air conditioner device |
| CN205454981U (en) * | 2016-03-29 | 2016-08-17 | 四川省华派生物制药有限公司 | Greenhouse ventilation flow straightener |
| CN205783240U (en) * | 2016-06-24 | 2016-12-07 | 宋世海 | Utilize the heating of solar radiation heat and the ventilating system of industrial premises peripheral structure |
| CN206118617U (en) * | 2016-11-03 | 2017-04-26 | 兰友银 | Vegetable greenhouse with ventilation unit |
| CN206618066U (en) * | 2017-03-28 | 2017-11-07 | 张绒 | A kind of clean type heating and ventilation air-conditioning device |
| CN206629579U (en) * | 2017-03-22 | 2017-11-14 | 黄河科技学院 | Energy saving greenhouse structure |
-
2018
- 2018-06-22 CN CN201810652785.9A patent/CN108811956A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090104867A1 (en) * | 2007-10-22 | 2009-04-23 | Sherman John F | Building aperture mounted ventilation apparatus |
| CN201421152Y (en) * | 2009-03-25 | 2010-03-10 | 黄仕友 | Room non energy-consuming ventilation device |
| CN202179004U (en) * | 2011-07-05 | 2012-04-04 | 东北石油大学 | Ventilating device for agricultural greenhouse |
| CN204757235U (en) * | 2015-07-07 | 2015-11-11 | 王峰 | Cleaning type heating and ventilation air conditioner device |
| CN205454981U (en) * | 2016-03-29 | 2016-08-17 | 四川省华派生物制药有限公司 | Greenhouse ventilation flow straightener |
| CN205783240U (en) * | 2016-06-24 | 2016-12-07 | 宋世海 | Utilize the heating of solar radiation heat and the ventilating system of industrial premises peripheral structure |
| CN206118617U (en) * | 2016-11-03 | 2017-04-26 | 兰友银 | Vegetable greenhouse with ventilation unit |
| CN206629579U (en) * | 2017-03-22 | 2017-11-14 | 黄河科技学院 | Energy saving greenhouse structure |
| CN206618066U (en) * | 2017-03-28 | 2017-11-07 | 张绒 | A kind of clean type heating and ventilation air-conditioning device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206609098U (en) | Active beam-cooling | |
| CN105830819B (en) | A kind of wet curtain fan positive draft circulation temperature lowering system and its segmented cooling method | |
| CN108934634A (en) | A kind of greenhouse uniformly heats air supply device | |
| CN204482526U (en) | A kind of double-layer inflatable booth | |
| CN102204492B (en) | High-efficiency energy-saving Venlo greenhouse | |
| CN109699352A (en) | Integrated environment regulator control system and regulation method are provided to crop canopies space | |
| CN109041961A (en) | A kind of greenhouse-grown area targeting air-supply tuyere device | |
| CN109792912A (en) | A kind of phjytotron internal air circulation system and its control method | |
| CN207123120U (en) | The drying room that a kind of Large Copacity is uniformly dried | |
| CN108800383A (en) | A kind of triangle greenhouse solar chimney ventilating system | |
| CN106105887A (en) | A kind of heliogreenhouse being applicable to the cultivation of facility Fructus Pruni pseudocerasi | |
| CN204165327U (en) | A kind of two-way airflow apparatus for baking | |
| CN206686755U (en) | A kind of intelligent rice seedling greenhouse | |
| CN1322461A (en) | Ecological environment controlling method for edible fungus cultivating chamber | |
| CN204742465U (en) | Shine dry sunning equipment of convective heat transfer of blue or green unfinished tea | |
| CN108934635A (en) | A kind of energy-saving air port air supply device of green house of vegetables | |
| CN201014892Y (en) | Greenhouse type agricultural product solar drying facilities | |
| CN108811956A (en) | A kind of trapezoidal greenhouse solar chimney ventilating system | |
| CN208001866U (en) | A kind of birds hatching storehouse | |
| CN204482525U (en) | A kind of double-layer inflatable booth with sun-shading frame | |
| CN108934637A (en) | A kind of slope greenhouse solar chimney ventilating system | |
| CN108811973A (en) | A kind of equilateral triangle greenhouse solar chimney ventilating system | |
| CN109168791A (en) | A kind of semicircle greenhouse solar chimney air supply device | |
| CN205946744U (en) | Sunlight greenhouse suitable for cultivation of facility cherry | |
| CN109121897A (en) | A kind of solar energy greenhouse change air port air supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181116 |
|
| WW01 | Invention patent application withdrawn after publication |