CN115380847B - Air conditioning ventilation system of cultivation house and control method thereof - Google Patents
Air conditioning ventilation system of cultivation house and control method thereof Download PDFInfo
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- CN115380847B CN115380847B CN202211027095.7A CN202211027095A CN115380847B CN 115380847 B CN115380847 B CN 115380847B CN 202211027095 A CN202211027095 A CN 202211027095A CN 115380847 B CN115380847 B CN 115380847B
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- 238000009423 ventilation Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004378 air conditioning Methods 0.000 title claims abstract description 34
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 146
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 73
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 72
- 238000009395 breeding Methods 0.000 claims abstract description 45
- 230000001488 breeding effect Effects 0.000 claims abstract description 45
- 241000287828 Gallus gallus Species 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 10
- 208000023504 respiratory system disease Diseases 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000008645 cold stress Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 230000008642 heat stress Effects 0.000 description 4
- 235000013330 chicken meat Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses an air conditioning ventilation system of a cultivation house and a control method thereof, wherein the control method comprises the following steps: obtaining a growth stage of broiler chickens; when the broiler chickens are in a first growth stage, heating the breeding house through an air conditioning unit, increasing the environmental temperature in the breeding house to a preset temperature, and opening the ventilation window to perform positive-pressure exhaust on the breeding house; when the broiler chickens are in the second growth stage, the air supply intensity of the air blower of the air conditioning unit to the breeding house is regulated, and the air supply intensity is regulated in an auxiliary mode by matching with the wet curtain and the exhaust fan, so that the carbon dioxide concentration in the breeding house is in a preset interval. Compared with the prior art, the invention can realize the accurate control of ventilation in the cultivation house, can meet the comfort ventilation requirement of organisms, improve the air quality of the cultivation house and reduce the occurrence probability of respiratory diseases.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioning ventilation system of a cultivation house and a control method thereof.
Background
At present, the ventilation mode of the cultivation house mainly comprises a wet curtain, a ventilation window and an exhaust fan, the ventilation window is arranged on the side wall of the cultivation house, the wet curtain is arranged on the front end wall, the exhaust fan is arranged on the tail end wall, air is introduced through the ventilation window during the transition season, and the quality of the internal environment of the cultivation house is improved by adopting the negative pressure ventilation of the wet curtain and the exhaust fan when the environment is severe.
However, when negative pressure ventilation is carried out through the ventilation window, a large amount of unfiltered cold/hot air is introduced into a room, so that cold/heat stress is easily generated by cultured organisms, the growth is slowed down, and particles such as feed dust in a culturing house are easily caused to fly at a high wind speed, the air quality is poor, respiratory diseases of the cultured organisms are easily caused, and the culturing income is reduced.
Therefore, how to design an air conditioning ventilation system of a cultivation house and a control method thereof can realize the accurate control of ventilation in the cultivation house, and meet the requirements of biological comfort ventilation, and is a technical problem to be solved in the industry.
Disclosure of Invention
Aiming at the problem that the ventilation control mode in the cultivation house cannot meet the biological comfort ventilation requirement in the prior art, the invention provides an air conditioning ventilation system of the cultivation house and a control method thereof.
The technical scheme of the invention is that a control method of an air conditioning ventilation system of a cultivation house is provided, the ventilation system comprises a ventilation window, a wet curtain and an exhaust fan, and the control method comprises the following steps:
obtaining a growth stage of broiler chickens;
when the broiler chickens are in a first growth stage, heating the breeding house through an air conditioning unit, increasing the environmental temperature in the breeding house to a preset temperature, and opening the ventilation window to perform positive-pressure exhaust on the breeding house;
when the broiler chickens are in the second growth stage, the air supply intensity of the air blower of the air conditioning unit to the breeding house is regulated, and the air supply intensity is regulated in an auxiliary mode by matching with the wet curtain and the exhaust fan, so that the carbon dioxide concentration in the breeding house is in a preset interval.
Further, the ventilation system includes a plurality of control modes when the broiler chicken is in the second growth stage, the control method further comprising:
pre-establishing a control relation between the concentration of carbon dioxide in the cultivation house and a control mode of the ventilation system;
detecting the concentration of carbon dioxide in the cultivation house;
and determining a control mode of the ventilation system according to the comparison relation.
Further, the comparison relationship includes:
when the carbon dioxide concentration in the cultivation house is in a preset interval, controlling the ventilation system to be in a first control mode;
when the carbon dioxide concentration in the cultivation house is higher than the upper limit value of the preset interval, controlling the ventilation system to be in a second control mode;
and when the carbon dioxide concentration in the cultivation house is lower than the lower limit value of the preset interval, controlling the ventilation system to be in a third control mode.
Further, when the ventilation system is in the first control mode, the control method includes: and maintaining the current running state of the air conditioning unit, the wet curtain and the exhaust fan.
Further, when the ventilation system is in the second control mode, the control method further includes:
judging whether the environmental temperature in the cultivation house is lower than the external temperature;
if yes, opening of a rear air door of the wet curtain is regulated, a circulating water pump of the wet curtain is started in a circulating mode, and air supply intensity of the ventilation system is increased until the carbon dioxide concentration in the cultivation house is in the preset zone;
if not, the opening degree of the rear air door of the wet curtain is increased, and the air supply intensity of the ventilation system is increased until the carbon dioxide concentration in the cultivation house is in the preset zone.
Further, the circulating water pump for circularly starting the wet curtain comprises:
continuously starting a circulating water pump of the wet curtain to a second preset time;
and closing the circulating water pump to a third preset time, and repeating the opening action of the wet curtain.
Further, increasing the air supply intensity of the ventilation system includes:
one more exhaust fan is arranged, whether the current carbon dioxide concentration in the cultivation house is in a preset interval or not is detected, and if yes, the current running state of the exhaust fan is maintained;
if not, continuing to start the exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fan is completely started.
Further, the ventilation system's air supply intensity is increased, still includes:
when the exhaust fans are all started, detecting whether the current carbon dioxide concentration in the cultivation house is in the preset interval, if so, maintaining the current running state of the exhaust fans, and if not, increasing the air supply frequency of the air blowers of the air conditioning unit.
Further, when the ventilation system is in the third control mode, the control method further includes:
closing one exhaust fan, detecting whether the current carbon dioxide concentration in the cultivation house is in a preset interval, and if so, maintaining the current running state of the exhaust fan;
if not, continuing to close one exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fans are completely closed to the minimum number of open exhaust fans.
Further, the control method further includes:
when the exhaust fans are closed to the minimum number of the exhaust fans, detecting whether the current carbon dioxide concentration in the cultivation house is in a preset interval, if so, maintaining the current running state of the exhaust fans;
if not, reducing the air supply frequency of the air blower of the air conditioning unit until the carbon dioxide concentration in the cultivation house is in a preset zone.
Further, the control method further includes:
when the air supply frequency is reduced to the minimum operating frequency, if the carbon dioxide concentration in the cultivation house is still smaller than the lower limit value of the preset interval, the opening of the wet curtain is reduced until the carbon dioxide concentration in the cultivation house is in the preset interval.
Further, the minimum number of opening steps satisfies: q=nm×0.8/36000, where Q is the minimum open number, n is the number of broilers in the breeding house, and m is the average weight of broilers in the breeding house.
The invention also provides an air conditioning and ventilation system of the cultivation house, which adopts the control method.
Compared with the prior art, the invention has at least the following beneficial effects:
the environment parameters are monitored by the CO2 sensor and the temperature and humidity sensor arranged in the breeding house, the air conditioner is used for heating and conveying clean fresh air in the early growth stage of the broiler chickens, the ventilation window is closed in the middle and later growth stage of the broiler chickens through the ventilation window in a positive pressure mode, the clean fresh air is conveyed by the air conditioner, meanwhile, the wet curtain and the exhaust fan can assist in supplying air to reduce the running energy consumption of the air conditioner, the wet curtain also has a certain filtering function on the fresh air, the probability of respiratory diseases of the broiler chickens can be reduced through linkage control, and the biosafety is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the control of broiler chickens in a first growth stage;
FIG. 2 is a schematic diagram illustrating the control of the indoor temperature lower than the outside temperature in the second control mode;
FIG. 3 is a schematic diagram illustrating the control of the indoor temperature higher than the outside temperature in the second control mode;
FIG. 4 is a control schematic diagram of a third control mode;
fig. 5 is a schematic diagram showing overall control of broiler chickens in a second growth stage.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
At present, the ventilation mode of the cultivation house mainly comprises a wet curtain, a ventilation window and an exhaust fan, but when ventilation is carried out through negative pressure of the ventilation window, a large amount of unfiltered cold/hot air is introduced into a room, so that cold/heat stress is easily generated by cultivation organisms, the growth is slowed down, and particles such as feed dust in the cultivation house are easily caused to fly due to high wind speed, the air quality is poor, the respiratory diseases of the cultivation organisms are easily caused, and the cultivation income is reduced. The invention provides a control method of an air conditioning ventilation system of a breeding house, which combines a wet curtain, a ventilation window and an exhaust fan to execute corresponding control at different growth stages of broiler chickens, thereby meeting the ventilation requirement of biological comfort.
The ventilation system provided by the invention comprises a ventilation window arranged on a side wall body of the breeding house, a wet curtain arranged on a front wall body of the breeding house and an exhaust fan arranged on a rear wall body.
Specifically, the control method of the invention comprises the following steps:
obtaining a growth stage of broiler chickens;
when the broiler chickens are in the first growth stage, heating the breeding house through an air conditioning unit, increasing the environmental temperature in the breeding house to a preset temperature, and opening a ventilation window to perform positive-pressure exhaust on the breeding house;
when the broiler chickens are in the second growth stage, the air supply intensity of the air feeder of the air conditioning unit to the breeding house is regulated, and the air supply intensity is regulated in an auxiliary mode by matching with the wet curtain and the exhaust fan, so that the carbon dioxide concentration in the breeding house is in a preset interval.
The first growing stage is the early growing stage of the broiler chickens, namely the brooding growing stage of the broiler chickens, the fresh air quantity requirement of the broiler chickens in the growing stage is smaller, the main requirement in the breeding house is heating, so as to meet the growing requirement of the broiler chickens, furthermore, the probability of occurrence of diseases is reduced, ventilation in the breeding house is ensured by positive pressure air exhaust through the ventilating window in the growing stage, the air pressure in the breeding house is higher than the external air pressure due to the fact that the temperature in the breeding house is higher and the air pressure is higher, positive pressure air exhaust is generated when the ventilating window is opened, in addition, the heating in the breeding house is provided through the air conditioning unit, the heating requirement of the broiler chickens is generally maintained at 34 ℃, the preset temperature is set at 34 ℃, the heating requirement of the temperature is met through the air conditioning unit, meanwhile, the filtered clean air is provided for the breeding house, the air circulation is formed together with the ventilating window, good environment quality can be built for the broiler chickens in the growing stage, and a solid foundation of cost of the broiler chickens is laid.
Referring to fig. 1, in the first growth stage, the control mode is that the air conditioning unit heats and the ventilation window ventilates at positive pressure, and compared with the traditional negative pressure ventilation, the control mode can avoid cold/heat stress generated by organisms and reduce the pathogenic rate of broilers.
The second growth stage is the middle and later growth stage of the broiler chickens, namely the broiler chickens and the chicken-forming stage, under the growth stage, the demand of the broiler chickens on the growth temperature in the breeding house is reduced, meanwhile, more carbon dioxide is generated by the breathing of the broiler chickens, and in order to reduce the probability of occurrence of respiratory diseases, under the second growth stage, the air feeder of the air conditioning unit is required to supply air to the breeding house, and the ventilation control in the breeding house is realized by combining a wet curtain and auxiliary air supply of an exhaust fan, and meanwhile, the operation energy consumption of the air conditioning unit is reduced.
The invention provides a control method for the ventilation system, which comprises the following steps of determining the integral air supply intensity of the ventilation system according to the blower of an air conditioning unit, a wet curtain in a cultivation house and an exhaust fan, and setting a plurality of different control modes according to different carbon dioxide so as to adjust the concentration of the carbon dioxide and reduce the occurrence of respiratory diseases, wherein the control method provided by the invention further comprises the following steps:
a control relation between the carbon dioxide concentration in the cultivation house and a control mode of the ventilation system is established in advance;
detecting the concentration of carbon dioxide in the cultivation house;
a control mode of the ventilation system is determined based on the comparison.
In order to reduce the occurrence probability of the respiratory diseases of the broiler chickens in the breeding house, the ventilation degree in the breeding house needs to be improved, but the ventilation degree is generally not easy to measure, so that the corresponding control mode is mainly adjusted according to the carbon dioxide concentration. In this regard, the present invention includes the following relationships based on the control pattern of the carbon dioxide concentration adjustment:
when the carbon dioxide concentration in the cultivation house is in a preset interval, controlling the ventilation system to be in a first control mode;
when the carbon dioxide concentration in the cultivation house is higher than the upper limit value of the preset interval, controlling the ventilation system to be in a second control mode;
and when the carbon dioxide concentration in the cultivation house is lower than the lower limit value of the preset interval, controlling the ventilation system to be in a third control mode.
Referring to fig. 2, when the carbon dioxide concentration in the breeding house is in the preset interval, it is indicated that the environment in the breeding house is just suitable for the growth of broiler chickens, and no additional control on the ventilation system is needed, so the control method in the first control mode includes: and maintaining the current running state of the air conditioning unit, the wet curtain and the exhaust fan.
In the invention, the wet curtain consists of the rear air door and the circulating water pump, and the running state of the wet curtain is maintained, namely the opening of the rear air door in the wet curtain is kept unchanged;
the number of the exhaust fans in the ventilation system is multiple, and the running state of the exhaust fans is maintained, namely the number of the exhaust fans which are started is kept unchanged;
wherein the preset interval is (C mesh-delta C1, C mesh plus delta C2), and C mesh is the target concentration of carbon dioxide which is most suitable for the growth of broiler chickens and defaults to 1800PPM (the theory is between 1000PPM and 3000 PPM);
ΔC1 is the lower tolerance of carbon dioxide concentration, which defaults to 500PPM (which can be set between 0PPM and 1000PPM according to practical requirements);
ΔC2 is the upper tolerance of carbon dioxide concentration, which defaults to 500PPM (which can be set between 0PPM and 1000PPM depending on practical requirements).
When the concentration of carbon dioxide in the cultivation house is higher than the upper limit value of a preset interval, namely C mesh + [ delta ] C2, the ventilation effect in the cultivation house is relatively poor, the ventilation effect needs to be improved, the problem of respiratory tract caused by relatively poor ventilation in the cultivation house is avoided, and the ventilation effect in the cultivation house needs to be improved by controlling the ventilation system to be in a second control mode under the condition.
Referring to fig. 2 and 3, when the ventilation system is in the second control mode, the control method further includes:
judging whether the environmental temperature in the cultivation house is lower than the external temperature;
if yes, opening of a rear air door of the wet curtain is adjusted, a circulating water pump of the wet curtain is started in a circulating mode, and air supply intensity of a ventilation system is increased until carbon dioxide concentration in the cultivation house is in a preset zone;
if not, the opening degree of the rear air door of the wet curtain is adjusted to be larger, and the air supply intensity of the ventilation system is increased until the carbon dioxide concentration in the cultivation house is in a preset zone.
When the carbon dioxide concentration in the cultivation house is detected to be higher than the upper limit value of the preset interval for the first time, the running state of the current ventilation system is required to be maintained for a first preset time to avoid misjudgment of a unit, and after the first preset time, if the carbon dioxide concentration is still detected to be higher than the upper limit value of the preset interval, a second control mode is required to be formally entered to improve ventilation, wherein the first preset time is 30s (adjustable between 0s and 1800 s).
In the second control mode, different control modes are set according to the relation between the internal environment temperature of the current cultivation house and the external environment temperature, when the external environment temperature is higher than the internal environment temperature of the cultivation house, the opening of a rear air door of the wet curtain is adjusted first, then the circulating water pump is started, and the air supply intensity of the ventilation system is synchronously increased.
Wherein, circulation opens the circulating water pump of wet curtain, includes:
continuously starting a circulating water pump of the wet curtain to a second preset time;
and closing the circulating water pump to a third preset time, and repeating the opening action of the wet curtain.
Specifically, the wet curtain mainly comprises a circulating water pump and a rear air door, when the circulating water pump is started, the wet curtain can be wetted, heat can be taken away by means of evaporation of water, so that the effect of cooling is achieved, in addition, the wet curtain can also achieve the effect of purifying air, and the circulating control is adopted in the invention, because the wet curtain needs to pass through a third preset time when the heat is taken away by means of evaporation of water, the third preset time is needed to be closed after the circulating water pump is started for the second preset time so as to be used for evaporation of water, the effect of saving energy can be achieved, and the problems that the humidity in a cultivation house is too high or the temperature is too low can be prevented.
The second preset time is 60s (adjustable between 0s and 1800 s), and the third preset time is 300s (adjustable between 0s and 1800 s), and the third preset time is higher than the second preset time because the water evaporation time is generally longer.
The ventilation degree in the cultivation house can be improved by increasing the opening degree of the rear air door of the wet curtain, so that the concentration of carbon dioxide is reduced, and the default opening degree is 10% (the specific opening degree can be adjusted between 0% and 100%).
Further, increase the air supply intensity of exhaust fan, include:
one more exhaust fan is arranged, whether the concentration of carbon dioxide in the current cultivation house is in a preset interval is detected, and if so, the current running state of the exhaust fan is maintained;
if not, continuing to start an exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fan is completely started.
Further, when the exhaust fans are all started, whether the concentration of carbon dioxide in the current cultivation house is in a preset interval is detected, if so, the current running state of the exhaust fans is maintained, and if not, the air supply frequency of the air blowers of the air conditioning unit is increased.
This increase ventilation system air supply intensity's action, the control action is the complete unanimity when ambient temperature is higher than and breeds the interior ambient temperature of house and ambient temperature is less than breeds the interior ambient temperature of house, all is used for improving the ventilation degree, and both differences lie in, when the interior ambient temperature of breeding the house is higher than ambient temperature, has taken circulating water pump circulation action of opening, because circulating water pump can cool down at opening in-process here, and under the condition that breeds the house temperature and be less than ambient temperature, its own temperature is lower, need not to cool down the action again.
In addition, no matter how the external temperature is related to the temperature in the cultivation house, in the process of increasing the ventilation degree in the cultivation house, the opening degree of the wet curtain rear air door is always increased, then the exhaust fan is increased, and finally the air supply frequency of the air conditioner blower is increased, because if the exhaust fan is started first, then the opening degree of the wet curtain rear air door is increased, the negative pressure in the cultivation house is increased, and the growth of livestock is influenced;
in addition, compared with the air supply frequency of the air blower, the air blower is started firstly because the energy consumption of the air blower is lower, and if the control of the carbon dioxide concentration can be realized through the air blower, the air blower of the air conditioner is not required to be started, so that the energy consumption can be saved.
Further, when the concentration of carbon dioxide in the breeding house is lower than the lower limit value of the preset interval, namely, the C-mesh- Δc1, it is indicated that the ventilation effect in the breeding house is too high, and the ventilation effect needs to be reduced to avoid cold/heat stress of the broiler chicken in the breeding house, and slow down the growth, referring to fig. 4, when the ventilation system is in the third control mode, the control method further includes:
closing an exhaust fan, detecting whether the concentration of carbon dioxide in the current cultivation house is in a preset interval, and if so, maintaining the current running state of the exhaust fan;
if not, continuing to close an exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fan is completely closed to the minimum number of open exhaust fans.
Further, when the exhaust fans are closed to the minimum number of openings, detecting whether the concentration of carbon dioxide in the current cultivation house is in a preset interval, if so, maintaining the current running state of the exhaust fans;
if not, the air supply frequency of the air blower of the air conditioning unit is reduced until the carbon dioxide concentration in the cultivation house is in a preset zone.
In addition, if the carbon dioxide concentration in the cultivation house is still less than the lower limit value of the preset section when the air supply frequency of the air blower is reduced to the minimum operation frequency, the opening degree of the wet curtain needs to be reduced until the carbon dioxide concentration in the cultivation house is in the preset section.
In this case, the overall control logic of the ventilation system is just opposite to that in the second control mode, and is used to reduce the ventilation degree in the cultivation house, so the specific control principle is not repeated here.
In the control mode, the minimum opening number is as follows: q=nm×0.8/36000, where Q is the minimum number of open stages, n is the number of chickens in the raising house, m is the average weight of chickens in the raising house, where the minimum number of open stages is the number of exhaust fans necessary to meet the normal growth of chickens.
Referring to fig. 5, the overall control logic in the second growth stage is to enter different control modes according to the relationship between the carbon dioxide concentration in the cultivation house and the preset interval, directly maintain the running state of the current ventilation system in the first control mode, provide different control methods according to the difference between the environment temperature and the external temperature in the cultivation house in the second control mode, reduce the carbon dioxide concentration to make the carbon dioxide concentration in the preset interval, and return to the first control mode again, and increase the carbon dioxide concentration to make the carbon dioxide concentration in the preset interval and return to the first control mode again in the third control mode.
The invention also provides an air conditioning and ventilation system of the cultivation house, which adopts the control method.
Compared with the prior art, the invention can realize the accurate control of ventilation in the cultivation house by the control mode, meet the ventilation requirement of biological comfort, improve the air quality in the cultivation house and reduce the occurrence probability of respiratory diseases.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A control method of an air conditioning ventilation system of a cultivation house, the ventilation system comprising a ventilation window, a wet curtain and an exhaust fan, the control method comprising:
obtaining a growth stage of broiler chickens;
when the broiler chickens are in a first growth stage, heating the breeding house through an air conditioning unit, increasing the environmental temperature in the breeding house to a preset temperature, and opening the ventilation window to perform positive pressure exhaust on the breeding house;
when the broiler chickens are in the second growth stage, the air supply intensity of the air blower of the air conditioning unit to the breeding house is regulated, and the air supply intensity is regulated in an auxiliary mode by matching with the wet curtain and the exhaust fan, so that the carbon dioxide concentration in the breeding house is in a preset interval;
the ventilation system includes a plurality of control modes when the broiler chicken is in a second growth stage, the control method further comprising:
pre-establishing a control relation between the concentration of carbon dioxide in the cultivation house and a control mode of the ventilation system;
detecting the concentration of carbon dioxide in the cultivation house;
determining a control mode of the ventilation system according to the comparison relation;
the comparison relation comprises:
when the carbon dioxide concentration in the cultivation house is higher than the upper limit value of the preset interval, controlling the ventilation system to be in a second control mode;
when the ventilation system is in the second control mode, the control method further includes:
judging whether the environmental temperature in the cultivation house is lower than the external temperature;
if yes, the opening of the rear air door of the wet curtain is regulated, the circulating water pump of the wet curtain is circularly started,
increasing the air supply intensity of the ventilation system until the carbon dioxide concentration in the cultivation house is in the preset interval;
if not, the opening degree of the rear air door of the wet curtain is increased, and the air supply intensity of the ventilation system is increased until the carbon dioxide concentration in the cultivation house is in the preset zone.
2. The control method according to claim 1, wherein the collation relation further comprises:
when the carbon dioxide concentration in the cultivation house is in a preset interval, controlling the ventilation system to be in a first control mode;
and when the carbon dioxide concentration in the cultivation house is lower than the lower limit value of the preset interval, controlling the ventilation system to be in a third control mode.
3. The control method according to claim 2, characterized in that when the ventilation system is in a first control mode, the control method comprises: and maintaining the current running state of the air conditioning unit, the wet curtain and the exhaust fan.
4. The control method according to claim 1, characterized in that circulating the circulating water pump of the wet curtain is turned on, comprising:
continuously starting a circulating water pump of the wet curtain to a second preset time;
and closing the circulating water pump to a third preset time, and repeating the opening action of the wet curtain.
5. The control method according to claim 1, wherein increasing the air supply intensity of the ventilation system includes:
one more exhaust fan is arranged, whether the current carbon dioxide concentration in the cultivation house is in a preset interval or not is detected, and if yes, the current running state of the exhaust fan is maintained;
if not, continuing to start the exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fan is completely started.
6. The control method of claim 5, wherein increasing the supply air intensity of the ventilation system further comprises:
when the exhaust fans are all started, detecting whether the current carbon dioxide concentration in the cultivation house is in the preset interval, if so, maintaining the current running state of the exhaust fans, and if not, increasing the air supply frequency of the air blowers of the air conditioning unit.
7. The control method according to claim 2, characterized in that when the ventilation system is in a third control mode, the control method further comprises:
closing one exhaust fan, detecting whether the current carbon dioxide concentration in the cultivation house is in a preset interval, and if so, maintaining the current running state of the exhaust fan;
if not, continuing to close one exhaust fan, and repeatedly detecting the concentration of carbon dioxide in the cultivation house until the exhaust fans are completely closed to the minimum number of open exhaust fans.
8. The control method according to claim 7, characterized in that the control method further comprises:
when the exhaust fans are closed to the minimum number of the exhaust fans, detecting whether the current carbon dioxide concentration in the cultivation house is in a preset interval, if so, maintaining the current running state of the exhaust fans;
if not, reducing the air supply frequency of the air blower of the air conditioning unit until the carbon dioxide concentration in the cultivation house is in a preset zone.
9. The control method according to claim 8, characterized in that the control method further comprises:
when the air supply frequency is reduced to the minimum operating frequency, if the carbon dioxide concentration in the cultivation house is still smaller than the lower limit value of the preset interval, the opening of the wet curtain is reduced until the carbon dioxide concentration in the cultivation house is in the preset interval.
10. The control method according to claim 9, wherein the minimum number of open steps satisfies: q=nm×0.8/36000, where Q is the minimum open number, n is the number of broilers in the breeding house, and m is the average weight of broilers in the breeding house.
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