JP2016220567A - Carbon dioxide supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbon dioxide supply system capable of enhancing the growth of agricultural crops or the like by increasing the concentration of carbon dioxide while preventing a temperature rise in an agricultural facility.SOLUTION: A carbon dioxide supply system comprises an air supply passage 10 for taking air from the outside of an agricultural facility 50 to the inside thereof, an air supply blower 11 disposed in the air supply path 10 and provided for supplying air to the air supply path 10, a combustor 12 for discharging combustion exhaust gas to the supply air passage 10, and a water spray device 35 for spraying water to the air flowing through the supply air passage 10. The air containing the combustion exhaust gas is cooled by spraying water by the water spraying device 35 and then supplied to the inside of the facility 50 to enhance the concentration of carbon dioxide in the facility 50 while preventing a temperature rise in the facility 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an agricultural carbon dioxide supply device that supplies carbon dioxide generated by combustion to a plant cultivation house or the like.

  2. Description of the Related Art Conventionally, in an agricultural facility such as a plant cultivation house, carbon dioxide (gas) is supplied into the facility in order to promote the photosynthesis of crops cultivated in the facility and to promote and improve the quality. Yes. As an apparatus for supplying carbon dioxide used for this kind of purpose, an apparatus for releasing combustion exhaust gas containing carbon dioxide generated by combustion into a facility is known.

  For example, Patent Document 1 discloses a combustion unit provided on the outer side surface of a box, a can provided in the box connected to the combustion unit, and a blower provided in the box below the can. , A combustion-type carbon dioxide generator is disclosed.

  The carbon dioxide generator of the same document forms a flame inside the can body by the combustion section, burns fuel inside the can body, and stirs the combustion gas and combustion air in the exhaust section provided inside the can body. And completely burnt to generate carbon dioxide.

  The high-temperature (about 900 ° C.) carbon dioxide generated by combustion is sufficiently mixed with the air in the greenhouse (about 20 ° C.) sent by the blower in the mixing space provided above the can in the box. It is released into the greenhouse after the temperature drops (about 80 ° C). As a result, it is possible to prevent burns caused by hot air (combustion exhaust gas containing carbon dioxide) blown from a carbon dioxide generator and high-temperature damage to crops.

  Further, for example, Patent Document 2 discloses that high-temperature combustion exhaust gas is mixed with normal-temperature air and cooled. That is, the combustion-type CO2 generator disclosed in the same document mixes high-temperature combustion exhaust gas generated by a burner provided at the lower part of the machine with air sucked from an intake cylinder at the upper part of the machine by driving a fan. Then, it is cooled and supplied to a predetermined place.

Japanese Unexamined Patent Publication No. 2004-135639 (5th page, FIGS. 1 and 2) Japanese Utility Model Publication No. 7-44891 (page 4, FIG. 1)

  However, in the above-described conventional technology, an increase in temperature at the time of supplying carbon dioxide into a facility such as a plant cultivation house is suppressed, and improvement is achieved from the viewpoint of suitably maintaining the temperature, humidity, and carbon dioxide concentration in the facility. There was room.

  Specifically, in the above-described prior art, the temperature of the combustion exhaust gas supplied into the facility is lowered by taking in the air in the facility and mixing it with high-temperature combustion exhaust gas. However, a large amount of air is required for cooling the combustion exhaust gas, and the cooling efficiency is not good.

  In addition, when the apparatus is operated to supply carbon dioxide in a state where the temperature in the facility is sufficiently high, heat generated by combustion is released into the facility. Since all the released heat is used to increase the temperature in the facility, there is a problem that the temperature in the facility becomes higher than a suitable temperature.

  In particular, during the daytime when photosynthesis of agricultural crops becomes active and requires a large amount of carbon dioxide, in addition to heat radiation from the carbon dioxide supply device, the inside of the facility is also warmed by solar radiation. Easy to rise. If the temperature in the facility rises excessively, the pores of the crops grown in the facility will close and photosynthesis will decrease, reducing the effects of forcing etc. by supplying carbon dioxide to the facility, and further increasing the temperature of the crops. It can also cause disability.

  Conventionally, when discharging exhaust gas into the facility and supplying carbon dioxide, if the temperature in the facility rises excessively during the day, the facility is cooled using an air conditioner installed separately. It was. However, such a method requires an air conditioner having a sufficient cooling capacity, and it becomes difficult to supply carbon dioxide if the heat input by combustion and solar radiation exceeds the cooling capacity of the air conditioner.

Specifically, if the temperature inside the facility cannot be maintained at a predetermined temperature even after operating the air conditioner, the supply of carbon dioxide by combustion is stopped, or the facility is opened and a large amount of outside air is introduced. It was dealt with by. In either case, the concentration of carbon dioxide in the facility cannot be increased, and the effect of promoting the cultivation of crops cannot be obtained.
Further, it is not preferable from the viewpoint of energy saving to perform the cooling operation by the air conditioner while burning the fuel and releasing the heat into the facility.

  Moreover, it is calculated | required that the temperature and humidity in a facility are maintained suitably from a viewpoint of maintaining favorable cultivation and quality of agricultural products. In particular, the humidity in the facility tends to increase because a large amount of moisture is supplied to the air in the facility due to evaporation of moisture from the soil due to solar radiation and the like, and transpiration from plants grown in the facility. . If the humidity in the facility rises, condensation and the like are likely to occur, which is not preferable because it causes deterioration of the quality of the crop.

  This invention is made | formed in view of said situation, The place made into the objective is to raise the density | concentration of a carbon dioxide, suppressing the temperature rise in the facilities for agriculture, etc., and aiming at the promotion of agricultural products, etc. An object of the present invention is to provide a carbon dioxide supply device capable of performing the above.

  Another object of the present invention is to provide a carbon dioxide supply that has a function of supplying carbon dioxide, a function of supplying heat, and a ventilation function, and can suitably adjust the concentration, temperature, and humidity of carbon dioxide in the facility. To provide an apparatus.

  The carbon dioxide supply device of the present invention includes an air supply path for taking in air from the outside of a farm facility, an air supply blower that is provided in the air supply path and flows air to the air supply path, and the air supply A combustor that discharges combustion exhaust gas to the air path; and a water spray device that sprays water onto the air flowing through the air supply path, and the water containing the combustion exhaust gas is supplied with water by the water spray device. It cools by spraying and supplies to the inside of the said facility.

  According to the carbon dioxide supply device of the present invention, an air supply path for taking air into the inside from the outside of the agricultural facility, an air supply fan that is provided in the air supply path and flows air to the air supply path, and an air supply A combustor that discharges combustion exhaust gas in the path, and a water spray device that sprays water on the air flowing in the air supply path. And water is sprayed on the air containing combustion exhaust gas by a water spraying device. Thereby, the air containing combustion exhaust gas can be efficiently cooled by the latent heat when the sprayed water evaporates. Therefore, the concentration of carbon dioxide in the facility can be increased while suppressing the temperature rise in the facility.

  In addition, high-temperature and high-humidity air can be supplied into the facility by strengthening combustion by the combustor while spraying water with the water spray device. Thereby, heating and humidification in a facility can be performed while supplying carbon dioxide into the facility.

  Moreover, you may have the exhaust path which discharges air from the inside of a plant | facility to the exterior, and the exhaust fan for an air which is provided in an exhaust path and flows air into an exhaust path. Thereby, the ventilation efficiency of the air in a facility can be improved. That is, the supply of carbon dioxide and the discharge of air in a facility containing a lot of moisture and a high temperature can be performed simultaneously. As a result, it is possible to increase the concentration of carbon dioxide while suppressing the temperature rise in the facility and to reduce the humidity in the facility.

  Moreover, you may supply the air discharged | emitted from an exhaust path to the outdoor unit of a heat pump apparatus. Thereby, it is possible to improve the efficiency of the heat pump device and save energy by effectively using the retained heat of the air discharged from the facility whose temperature is higher than that of the outside air.

  In addition, in a state where combustion in the combustor of the carbon dioxide supply device is stopped, the water spray device and the air supply blower may be operated to supply air into the facility. Thus, when it is not necessary to supply carbon dioxide into the facility, the taken-in outside air can be humidified and cooled and supplied to the facility without supplying carbon dioxide by combustion. As a result, humidification and cooling inside the facility can be performed simultaneously.

  Further, in a state where water spraying by the water spraying device of the carbon dioxide supply device is stopped, the combustor and the air supply blower may be operated to supply air into the facility. Thereby, carbon dioxide can be supplied while warming the inside of the facility by effectively using the heat generated by the combustor.

  In addition, in a state where combustion in the combustor of the carbon dioxide supply device and spraying of water by the water spray device are stopped, the air supply blower may be operated to supply air into the facility. Thus, outside air can be introduced into the facility without supplying carbon dioxide by combustion.

  For example, when the temperature in the facility rises excessively during the daytime when the solar radiation is strong, the temperature in the facility can be adjusted by introducing low temperature outside air into the facility. Moreover, since the outside air with low absolute humidity can be introduced into the facility and the humidity in the facility can be reduced and suitably maintained, deterioration in the quality of crops due to condensation or the like can be prevented.

  In addition, since carbon dioxide is consumed by the photosynthesis of agricultural products, the concentration of carbon dioxide in the facility decreases and becomes lower than the concentration of carbon dioxide in the outside air. For this reason, even when combustion in the combustor is stopped, by introducing outside air into the facility, carbon dioxide in the outside air is supplied into the facility, and the concentration of carbon dioxide in the facility decreases. This can be suppressed.

  Furthermore, a storage container for storing carbon dioxide may be provided, and the carbon dioxide in the storage container may be supplied to the inside of the facility through an air supply path. Thereby, the density | concentration of the carbon dioxide in a facility can be raised, maintaining the temperature and humidity in a facility suitably.

  Thus, according to the carbon dioxide supply device of the present invention, while supplying carbon dioxide into the facility, the temperature and humidity environment in the facility is changed to any desired conditions (“low temperature / high humidity”, “low temperature / low humidity”, “ High temperature / high humidity ”and“ high temperature / low humidity ”).

It is the schematic which shows the installation condition of the carbon dioxide supply apparatus which concerns on embodiment of this invention. It is a lineblock diagram showing the carbon dioxide supply device concerning the embodiment of the present invention. It is a figure which shows the operating method of the carbon dioxide supply apparatus which concerns on embodiment of this invention.

Hereinafter, a carbon dioxide supply device concerning an embodiment of the present invention is explained in detail based on a drawing.
FIG. 1 is a schematic view showing an installation state of a carbon dioxide supply device 1 according to an embodiment of the present invention. As shown in FIG. 1, the carbon dioxide supply device 1 is disposed adjacent to a farming facility 50, generates carbon dioxide by combustion, and supplies (supply) air containing the carbon dioxide into the facility 50. This is a device that cares SA).

  The agricultural facility 50 is, for example, a plant cultivation house or a plant factory. Inside the agricultural facility 50, for example, plants 55 (agricultural crops) such as various vegetables, fruit trees or flower buds are cultivated mainly in winter. By supplying carbon dioxide with the carbon dioxide supply device 1, photosynthesis of the plant 55 cultivated inside the facility 50 can be activated, and promotion of growth and improvement of quality can be achieved.

  The air supply port 16 of the carbon dioxide supply device 1 is a blowout port for air (air supply SA) containing carbon dioxide at a high concentration. The air supply port 16 is connected to the facility 50 using a duct 52 made of, for example, an aluminum flexible duct or the like. In addition, a duct 51 is provided inside the facility 50 for guiding and supplying carbon dioxide to a predetermined place. The duct 51 is, for example, a synthetic resin duct and is connected to a duct 52 connected to the carbon dioxide supply device 1.

  The return air port 24 of the carbon dioxide supply device 1 is a suction port for taking in the air (return air RA) in the facility 50. The return air port 24 is connected to the facility 50 using a duct 54 made of, for example, an aluminum flexible duct or the like. The duct 54 may be connected to a duct 53 that is provided inside the facility 50 and sucks air in the facility 50.

  FIG. 2 is a configuration diagram showing the carbon dioxide supply device 1. As shown in FIG. 2, the carbon dioxide supply device 1 has an air supply path 10 that leads from the outside air inlet 14 to the air inlet 16, and an exhaust path 20 that leads from the return air outlet 24 to the exhaust outlet 26.

  The air supply path 10 is a path for taking outside air OA and supplying it to the facility 50 (air supply SA). On the other hand, the exhaust path 20 is a path for taking in air (return air RA) in the facility 50 and discharging it outside (exhaust EA).

  The air supply path 10 and the exhaust path 20 are defined by, for example, a partition wall formed by bending a steel plate or the like. Moreover, the outside air inlet port 14, the air supply port 16, the return air port 24, the exhaust port 26, and the like are openings formed on the side surface of a substantially rectangular parallelepiped casing of the carbon dioxide supply device 1 made of, for example, a steel plate. is there. Various forms can be adopted for each of these shapes and arrangements.

  In the air supply path 10, an air supply blower 11 for flowing air, a combustor 12 for burning fuel such as kerosene, and a water spray device 35 for spraying water are disposed. The air supply blower 11 is, for example, a double-sided suction type multi-blade blower (sirocco fan) or the like, and includes a motor (not shown) and a rotary blade driven by the motor, and near the air supply port 16 in the air supply path 10. It is arranged.

  By operating the air supply blower 11, the air in the air supply path 10 is discharged from the air supply port 16 (supply air SA), and accordingly, the air is supplied into the air supply path 10 through the outside air inlet 14. Outside air OA is inhaled.

  The installation location of the air supply blower 11 may be another place as long as air can flow through the air supply path 10. For example, the air supply blower 11 may be provided upstream of the combustor 12. Thereby, it can suppress that the air blower 11 is heated with the heat which the combustor 12 generate | occur | produces.

  The combustor 12 is provided so that combustion exhaust gas is discharged into the air supply path 10. In other words, the combustor 12 is provided so that the combustion exhaust gas is mixed with the outside air OA introduced from the outside air inlet 14. Thereby, the combustion exhaust gas containing carbon dioxide at a high concentration is supplied into the facility 50 (supply air SA).

  Further, the combustion air used for combustion in the combustor 12 may be the outside air OA introduced from the outside air inlet 14, or may be taken from an inlet (not shown) provided separately. Further, a combustion blower (not shown) for supplying combustion air may be provided separately.

  The water spraying device 35 includes a nozzle that ejects water in the form of a mist in the air supply path 10, takes in water through the water supply pipe 36, and sprays water into the air supply path 10. Thereby, the air flowing through the air supply path 10, that is, the air supply SA supplied into the facility 50 can be humidified.

  Further, the water containing the combustion exhaust gas is cooled by spraying water into the air supply path 10. That is, the air is cooled by the temperature of the water rising due to heat in the air (sensible heat) and the evaporation of the water (latent heat). Therefore, the air can be quickly cooled to a desired temperature.

  The water supply pipe 36 for supplying water to the water spray device 35 may be disposed inside the duct 52 or the duct 54 that connects the carbon dioxide supply device 1 and the facility 50. By disposing the water supply pipe 36 inside the duct 52 or the duct 54, the water supply pipe 36 can be prevented from freezing.

  Further, the air supply path 10 may be partitioned by a partition wall made of a steel plate or the like in which ventilation holes are formed. For example, a space in which the air supply blower 11 is disposed, a space in which the combustion exhaust gas from the combustor 12 is mixed, and a space in which water is sprayed from the water spray device 35 may be divided. Thereby, for example, damage to equipment due to combustion heat or spray water can be suppressed.

  The exhaust path 20 is provided with an exhaust blower 21 for flowing air through the exhaust path 20. The exhaust blower 21 is, for example, a double-side suction type multi-blade blower (sirocco fan) or the like, and includes a motor (not shown) and a rotary blade driven by the motor.

  By operating the exhaust fan 21, the air in the exhaust path 20 is discharged from the exhaust port 26 (exhaust EA), and the return air RA is sucked into the exhaust path 20 through the return port 24 accordingly. . Thereby, the inside of the facility 50 can be efficiently ventilated, and the temperature, humidity, and carbon dioxide concentration in the facility 50 can be adjusted using the outside air OA. Further, by operating the air supply fan 11 and the exhaust fan 21 simultaneously, the ventilation efficiency can be further increased.

  The carbon dioxide supply device 1 may include various sensors such as a temperature sensor, a humidity sensor, and a carbon dioxide sensor (not shown) for detecting the environment in the facility 50, the outside air conditions, the operating state of each component device, and the like. .

  In addition, the carbon dioxide supply device 1 includes a control device (not shown) that executes a predetermined calculation based on detection values and various set values of the various sensors, and the control device performs the combustor 12, the water spray device 35, the supply device. The air blower 11 and the exhaust blower 21 are controlled.

  FIG. 3 is a diagram illustrating an operation mode of the carbon dioxide supply device 1 and operating states of the air supply blower 11, the exhaust blower 21, the combustor 12, and the water spray device 35. With reference to FIG.2 and FIG.3, each operation mode of the carbon dioxide supply apparatus 1 is demonstrated.

(1) Low temperature carbon dioxide supply operation M1
An operation method (low temperature carbon dioxide supply operation M1) for cooling the air containing the combustion exhaust gas and supplying it to the facility 50 will be described. The low-temperature carbon dioxide supply operation M1 is executed when, for example, daytime sunshine requires carbon dioxide in the facility 50, the temperature in the facility 50 is sufficiently high, and heating or the like is not required.

  In the low-temperature carbon dioxide supply operation M1, the combustor 12, the water spray device 35, the air supply blower 11, and the exhaust blower 21 are operated. By operating the combustor 12, combustion exhaust gas containing carbon dioxide at a high concentration at a high temperature is generated and discharged into the air supply path 10. The combustion exhaust gas is cooled by being mixed with the low-temperature outside air OA introduced from the outside air intake port 14 in the air supply path 10.

  The air containing the combustion exhaust gas is further cooled by being sprayed with water from the water spray device 35 in the air supply path 10. That is, the water spray device 35 cools the air to a desired temperature by spraying water and using the sensible heat and latent heat of the water.

  Here, since the air containing combustion exhaust gas is cooled using the latent heat of water, the combustion exhaust gas can be efficiently cooled even if the amount of outside air OA mixed with the combustion exhaust gas is small. In addition, the heat generated by combustion is used not only for the temperature rise of air (sensible heat) but also for the evaporation of water (latent heat), so the temperature rise in the facility 50 is suppressed without reducing the amount of combustion. Can do.

  The cooled air is supplied into the facility 50 by the air supply fan 11 (air supply SA). Thus, in order to supply the low temperature air (supply air SA) containing the carbon dioxide generated by combustion to the inside of the agricultural facility 50, the carbon dioxide in the facility 50 is suppressed while suppressing the temperature rise in the facility 50. The concentration of can be increased.

  By operating the exhaust fan 21 together with the air supply fan 11, the air in the facility 50 is sucked from the return air port 24 (return air RA), flows through the exhaust path 20, and is discharged from the exhaust port 26 to the outside. (Exhaust EA). Thereby, since the air (return air RA) in the facility 50 can be discharged while introducing the outside air OA into the facility 50, the air in the facility 50 can be efficiently ventilated.

  Here, the outside air OA having a lower temperature and humidity than the air in the facility 50 is introduced by ventilation, and the air (return) in the facility 50 having a lower carbon dioxide concentration than the supply air SA and a higher temperature and humidity than the outside air OA. Qi RA) is discharged outside. Thereby, the density | concentration of a carbon dioxide can be increased, suppressing the temperature rise in the facility 50, and the humidity in the facility 50 can be maintained suitably.

  Further, in the low temperature carbon dioxide supply operation M1, the combustion amount of the combustor 12 may be suitably adjusted based on the concentration of carbon dioxide in the facility 50 detected by a carbon dioxide sensor (not shown) or the like. For example, the combustion amount of the combustor 12 may be increased when the concentration of carbon dioxide in the facility 50 is low. Thereby, the density | concentration of the carbon dioxide in the facility 50 can be maintained in a suitable state.

(2) Humidification heating operation M2
The operation method (humidification heating operation M2) which humidifies the air containing combustion exhaust gas and supplies it to the facility 50 will be described.

  The humidification heating operation M2 is an operation mainly intended for heating and humidification, and is executed when, for example, the temperature in the facility 50 is low and dry in winter. In the humidification heating operation M2, the combustor 12, the water spray device 35, the air supply blower 11, and the exhaust blower 21 are operated. Warm air containing combustion exhaust gas generated by the combustor 12 is humidified by spraying water from the water spray device 35.

  In the humidifying and heating operation M2, the amount of combustion exhaust gas supplied by the combustor 12 is increased as compared with the low temperature carbon dioxide supply operation M1, so that air having a temperature higher than that of the air supplied by the low temperature carbon dioxide supply operation M1 is obtained. It can be supplied into the facility 50. Thereby, heating and humidification in the facility 50 can be performed. Further, the humidifying and heating operation M <b> 2 can supply the carbon dioxide to the facility 50 in order to operate the combustor 12.

  Further, in the humidifying and heating operation M2, the combustion amount of the combustor 12 and the water spray amount of the water spray device 35 are adjusted based on the temperature and humidity in the facility 50 detected by a temperature sensor and a humidity sensor (not shown). May be. Thereby, the temperature and humidity in the facility 50 can be maintained in a suitable state.

(3) Humidification and cooling operation M3
An operation method (humidification cooling operation M3) in which air is cooled and humidified by spraying water and supplied to the facility 50 will be described.

  The humidifying and cooling operation M3 is executed when the inside of the facility 50 is cooled in a state that does not require the supply of carbon dioxide, for example, at the time of work such as planting or harvesting. In the humidifying and cooling operation M3, the supply blower 11 and the exhaust blower 21 are operated while water is sprayed by the water spray device 35 in a state where combustion in the combustor 12 is stopped.

  The air in the air supply path 10 is cooled by sensible heat and latent heat of water by spraying water. The air in the air supply path 10 is sent out by the air supply blower 11 and supplied into the facility 50. Thereby, the cooling and humidification in the facility 50 can be performed.

  Further, in the humidifying and cooling operation M3, the water spray amount of the water spray device 35 may be adjusted based on the temperature and humidity in the facility 50 detected by a temperature sensor and a humidity sensor (not shown). Thereby, the temperature and humidity in the facility 50 can be maintained in a suitable state.

(4) High temperature carbon dioxide supply operation M4
An operation method (high temperature carbon dioxide supply operation M4) for supplying air containing combustion exhaust gas to the facility 50 will be described. The high-temperature carbon dioxide supply operation M4 is executed, for example, when heating of the facility 50 is required in a cold time such as winter, and supply of carbon dioxide is required.

  In the high temperature carbon dioxide supply operation M4, the fuel is burned by the combustor 12 while the water spraying by the water spray device 35 is stopped, and the air supply blower 11 and the exhaust blower 21 are operated.

  High-temperature combustion exhaust gas containing carbon dioxide at a high concentration is generated from the combustor 12, and the high-temperature combustion exhaust gas is mixed with the outside air OA introduced from the outside air inlet 14, and the facility 50 is supplied by the air supply blower 11. It is blown in. Thereby, the inside of the facility 50 can be warmed while supplying carbon dioxide into the facility 50.

  In the high temperature carbon dioxide supply operation M4, the combustion amount of the combustor 12 may be adjusted based on the concentration of carbon dioxide in the facility 50 detected by a carbon dioxide sensor (not shown) or the like. Thereby, the density | concentration of the carbon dioxide in the facility 50 can be maintained in a suitable state.

(5) Heating operation M5
An operation method (heating operation M5) for supplying air containing combustion exhaust gas to the facility 50 will be described. The heating operation M5 is mainly performed for heating in the facility 50, and is executed when, for example, humidification in the facility 50 is unnecessary and the temperature is low.

  The heating operation M5 is an operation of operating the air supply blower 11 and the exhaust blower 21 while supplying the combustion exhaust gas by the combustor 12 in a state where the water spraying by the water spray device 35 is stopped. By the heating operation M5, the inside of the facility 50 can be warmed by effectively using the combustion heat generated by the combustion of the combustor 12. Carbon dioxide can also be supplied into the facility 50.

  In the heating operation M5, the combustion amount of the combustor 12 may be adjusted based on the temperature in the facility 50 detected by a temperature sensor (not shown) or the like. Thereby, the temperature in the facility 50 can be maintained in a suitable state.

(6) Ventilation operation M6
The ventilation operation M6 is an operation for operating the air supply blower 11 and the exhaust blower 21 in a state where the combustor 12 and the water spray device 35 are stopped. Thereby, when it is not necessary to supply combustion exhaust gas into the facility 50, outside air OA can be introduced into the facility 50 without supplying carbon dioxide by combustion.

  For example, when the temperature in the facility 50 excessively increases during the daytime when the solar radiation is strong, the temperature in the facility 50 can be adjusted by introducing a low temperature outside air OA into the facility 50. Moreover, since the outside air OA with a low absolute humidity can be introduced into the facility 50 and the humidity in the facility 50 can be lowered and suitably maintained, it is possible to prevent deterioration in the quality of crops due to condensation or the like. it can.

  Further, in the facility 50, carbon dioxide is consumed by photosynthesis of the plant 55 (see FIG. 1), and the concentration of carbon dioxide tends to decrease. Therefore, the concentration of carbon dioxide in the facility 50 during the daytime is outside air. It becomes lower than the concentration of carbon dioxide in OA.

  For this reason, even when combustion in the combustor 12 is stopped, by introducing the outside air OA into the facility 50, carbon dioxide in the outside air OA is supplied into the facility 50. It can suppress that the density | concentration of carbon falls.

(7) Stop M0
The stop M0 is a state in which the combustor 12, the water spray device 35, the air supply blower 11, and the exhaust blower 21 are stopped. For example, when the temperature, humidity, and carbon dioxide concentration in the facility 50 do not need to be adjusted, the stop M0 is set. Thereby, unnecessary circulation between the air in the facility 50 and the outside air OA can be suppressed, heat loss can be reduced, and energy consumption can be reduced.

  As described above, according to the present embodiment, by switching various operation methods of the carbon dioxide supply device 1, the temperature and humidity environment in the facility 50 can be set to a desired value while suitably controlling the concentration of carbon dioxide in the facility 50. It is possible to approach all conditions (“low temperature / high humidity”, “low temperature / low humidity”, “high temperature / high humidity”, “high temperature / low humidity”). That is, the temperature, humidity, and carbon dioxide concentration in the facility 50 can be maintained in a suitable environment for the plant 55.

  The operation method switching operation can be automatically performed by a control device (not shown) based on various inputs and various set values from a temperature sensor, a humidity sensor, and a carbon dioxide sensor (not shown).

  Further, the carbon dioxide supply device 1 may be installed inside the facility 50. In that case, a duct or the like connected to the outside of the facility 50 may be connected to the outside air suction port 14 and the exhaust port 26.

  Moreover, you may supply the exhaust_gas | exhaustion EA discharged | emitted from the exhaust port 26 to evaporators (outdoor heat exchangers), such as a heat pump apparatus provided with a vapor compression refrigeration cycle circuit, for example. That is, the exhaust EA may be sucked into the outdoor unit of the heat pump device and used as a heat source of the heat pump device. Accordingly, the heat (exhaust heat) retained in the exhaust gas EA exhausted from the facility 50 having a temperature higher than that of the outside air OA can be effectively used to improve the efficiency of the heat pump device and save energy.

  Further, instead of or in addition to the generation of carbon dioxide by the combustor 12, carbon dioxide may be supplied from a storage container (cylinder) not shown. Thereby, for example, in a state where heating is unnecessary, the concentration of carbon dioxide in the facility 50 can be increased while suitably controlling the temperature and humidity in the facility 50.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Carbon dioxide supply apparatus 10 Air supply path 11 Supply air blower 12 Combustor 14 Outside air intake port 16 Supply air port 20 Exhaust path 21 Exhaust air blower 24 Return air port 26 Exhaust port 35 Water spray apparatus

Claims (7)

An air supply route for taking in air from the outside of the agricultural facility;
An air supply blower that is provided in the air supply path and flows air through the air supply path;
A combustor for discharging combustion exhaust gas to the air supply path;
A water spray device for spraying water on the air flowing through the air supply path,
A carbon dioxide supply device, wherein the air containing the combustion exhaust gas is cooled by spraying water with the water spray device and supplied to the inside of the facility. An exhaust path for exhausting air from the inside of the facility to the outside;
2. The carbon dioxide supply device according to claim 1, further comprising an exhaust blower that is provided in the exhaust path and causes air to flow through the exhaust path.   The carbon dioxide supply device according to claim 2, wherein air discharged from the exhaust path is supplied to an outdoor unit of a heat pump device.   The air spray device and the air supply blower are operated in a state where combustion in the combustor is stopped to supply air into the facility. The carbon dioxide supply device according to item.   5. The air according to claim 1, wherein air is supplied into the facility by operating the combustor and the air supply blower in a state where water spraying by the water spray device is stopped. The carbon dioxide supply device according to claim 1.   6. The air supply blower is operated in a state where combustion in the combustor and water spraying by the water spraying device are stopped to supply air into the facility. The carbon dioxide supply device according to any one of the above. A storage container for storing carbon dioxide;
The carbon dioxide supply device according to any one of claims 1 to 6, wherein carbon dioxide in the storage container is supplied to the inside of the facility through the air supply path.

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