JP3206774B2 - Greenhouse cooling controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically controls the temperature of a cultivated greenhouse for the purpose of changing the flowering time from a normal time in order to ship products (fruits and flowers) at a high price. To improve a cooling control device.

[0002]

BACKGROUND OF THE INVENTION The applicant of the present invention has previously disclosed a nighttime cooling control apparatus for a greenhouse based on the difference between the temperature of the greenhouse and the temperature outside the greenhouse, the amount of solar radiation before sunset, and the heat transmission rate of the greenhouse at that time. A technique was proposed in which the heat balance was calculated, and the ventilation or cooling was determined based on the heat balance. (Japanese Patent Application Laid-Open No. 62-361)
With the adoption of this technology, melons can be supplied throughout the year with high value-added quality.

[0003]

The object of the invention is to solve the present invention is the basis of the above-described technique, in the cultivation of Koc ® uranium, is flowering early flowering time, it is shipped to the high price period, management on important Therefore, during July to the end of October, the greenhouse is 25 ° C during the day and 20 ° C at night.
It is necessary to perform cooling both day and night in order to maintain a low temperature, and an object of the present invention is to provide a cooling control device.

[0004]

In a cooling controller for a greenhouse in which plants are grown, the heat balance of the greenhouse at that time is calculated based on the temperature difference between the inside and outside of the greenhouse, the amount of solar radiation, and the heat transmission coefficient of the greenhouse. Room temperature control means for determining whether ventilation or cooling based on heat balance and controlling room temperature, and shuts out the flow of indoor cool air
Cooling car provided to cover the ceiling of the greenhouse body
Ten and opening / closing means for opening and closing the cool curtain
When cooling is not required, open the curtain.
If cooling is required, turn on the cooling device and
The cooling curtain is closed, and the skylight is opened when the amount of solar radiation is larger than a predetermined solar radiation amount set value.

[0005]

When the temperature in the greenhouse is higher than the set value, in addition to the conventional temperature control effect, the outflow of cold air in the greenhouse can be effectively shut off by closing the cooling curtain to reduce the power consumption of the cooling device. . Also, in the daytime cooling, unlike the nighttime cooling, the air temperature between the outer wall and the cooler curtain becomes higher than the outside air temperature due to solar radiation heat, so that the cooldown effect can be enhanced by opening the skylight.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a configuration diagram showing one embodiment of the present invention. 1 is a greenhouse main body, 101 is a ceiling ventilation window, 102 to 103 are ventilation windows on a wall surface, 201 to 203 are electric motors for opening and closing the ventilation windows,
3 is a cooling device, 4 is a temperature sensor in a greenhouse, 5 is an outside air temperature sensor in a greenhouse, 6 is a solar radiation sensor, 7 is a control device using a microcomputer, an operation output MV1 to the cooling device, a curtain for cooling. The operation output MV2 to the motor for opening and closing operation, the operation output MV3 to the motor for opening and closing the wall ventilation window, and the operation output MV4 to the motor for opening and closing the ceiling ventilation window are transmitted. Reference numeral 401 denotes a cooling curtain which mainly comprises a keyboard and is used for exchanging information with the control device. The cooling curtain 401 mainly blocks outflow of indoor cool air, and 301 denotes an electric motor for opening and closing the cooling curtain. The operation of the control device of the present invention will be described based on the flowchart of FIG. In step (1), a cooling judgment value S is calculated by the following equation. Heat balance S = (Greenhouse transmittance) X (solar radiation) X (floor area)
-(Greenhouse surface area) X (Target temperature-Outside air temperature) X (Heat transmissivity) X (Underground heat release) X α The transmittance of the greenhouse is a constant determined by the materials and dimensions of the roof, walls, and windows. Is 5.0 to 5.5 Kca in a glass room such as a greenhouse
^{l / m 2/0 C /} hr underground heat radiation amount estimated value is calculated based on the amount of solar radiation that day. Assuming that K ₁ and K ₂ are constants, the integral value of the solar radiation time with respect to K ₁ (solar radiation amount−K ₂ ) is obtained. When it becomes negative, it is set to zero. α is a constant indicating hysteresis and safety factor. Based on the obtained heat balance S, the necessity of cooling is determined in step (2). If the heat balance S is positive, the determination is YES and the process proceeds to step (3). When the result is NO, the operation output MV3 for opening the ventilation window and the operation output MV2 for opening the cooling curtain are transmitted to keep the cooling device OFF. In step (3), the room temperature is set to a set value (for example, 25 ° C. or 20 ° C.).
Is determined to be higher than the above, and in the case of YES, the operation output MV1 to proceed to step (4) to turn on the cooling device 3
Outgoing. In step (5), side windows 102, 103
To send the operation output MV3, and further step (6)
Sends an operation output MV2 for closing the cool curtain 301. At step (7), the room temperature and the set cooling temperature are checked. If this temperature is smaller than the lower limit of the hysteresis width of the cooling operation, the result is YES, and the routine proceeds to step (12).
If NO is determined, the process proceeds to step (8). In step (8), it is checked whether the amount of solar radiation is larger than the set amount of solar radiation. If the amount of solar radiation is larger, the determination is YES, and the process proceeds to step (10). In step (10), an operation output MV4 for opening the skylight is output. If NO is determined, the process proceeds to step (9). In step (9), an operation output MV4 for closing the skylight is output.

[0007]

According to the invention the invention, in a greenhouse for growing Koc ® uranium, it is possible to automate the management of air conditioning system for controlling the room temperature, in addition to labor saving operation, wasted energy Consumption can be prevented.
In addition, the insulated curtain which has been mainly used at night until now is operated in conjunction with the cooling device 3,
Not add any special equipment it can be applied to the cultivation of such Koc ® uranium.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing an operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Greenhouse 101 Ceiling ventilation window 102, 103 Wall ventilation window 3 Cooling device 4, 5 Temperature sensor 6 Solar radiation sensor 7 Control device 8 Man-machine interface 401 Cooling curtain 201-203 Ventilation window opening / closing motor 301 Cooling curtain opening / closing motor MV1 Cooling Device operation signal line MV2 Cooling curtain operation signal line MV3 Wall ventilation window opening / closing operation signal line MV4 Ceiling window opening / closing operation signal line

Claims (1)

(57) [Claims] 1. A cooling controller for a greenhouse in which plants are grown, wherein a heat balance of the greenhouse at that time is calculated based on a temperature difference between the inside and outside of the greenhouse, an amount of solar radiation, and a heat transmission coefficient of the greenhouse, and based on the heat balance. Room temperature to control room temperature by deciding between ventilation and cooling
Control means and a greenhouse body to block outflow of indoor cold air
Cooling curtains provided over the ceiling of the
Opening / closing means for operating the opening / closing of the curtain for use, and when the cooling is not required, the curtain is opened and the cooling is required.
If this is the case, turn on the cooling device and
A cooling control device , wherein the ten is closed, and the skylight is opened when the amount of solar radiation is larger than a predetermined value of the amount of solar radiation.