JP2015140947A - Air conditioner for agriculture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for agriculture capable of distributing calory in a cultivation space while restricting consumption energy.SOLUTION: This invention outputs a required supply calory, as a rated supply calory, required for forming temperature environment suitable for growing plants in a cultivation space 2 and comprises a heat exchanging coil 6 for outputting a rated calory corresponding to the rated supply calory; and a fan device 7 capable of changing-over between a rated air amount output mode for outputting a rated air amount corresponding to a rated calory and an air amount increasing output mode for outputting a prescribed air amount more than a rated air amount as an agitating air amount.

Description

  The present invention relates to an agricultural air conditioner and relates to a technique for uniformly supplying a necessary amount of heat to a cultivation space.

  Conventionally, when vegetables, fruits, flowers and the like are cultivated in an agricultural greenhouse or the like, it is necessary to realize a temperature environment suitable for plant growth in the cultivation space inside the agricultural greenhouse. For this reason, a heating device or a cooling device is provided to supply an amount of heat commensurate with the heat load. The rated output with respect to the heat load of this heating device or cooling device is determined by the supply heat amount, which is the product of the air discharge temperature and the air volume, and the rated air volume of the fan device and the rated heat value of the heat source are determined according to the rated supply heat amount. The air volume was basically not changed.

  Moreover, in a general air conditioner, the indoor current temperature is compared with a set target temperature, and when the temperature difference is large, the fan device is operated at the maximum air volume while the maximum heat generation amount is output. is there.

  For example, in what is described in Patent Document 1, a blower fan for blowing heat-exchanged air into a room is rotated at a higher speed than the highest rotation speed during normal operation, and the air flow to be blown is maximized. After the power operation is performed and the full power operation is performed, the rotational speed of the blower fan is gradually decreased, and the rotational speed higher than the highest rotational speed during normal operation is maintained.

Japanese Patent No. 4571520

  However, in large agricultural greenhouses, because the indoor space is large, the air flow carrying the heat does not spread evenly to every corner of the indoor space, and there are places where the heat is unevenly distributed in the indoor space, and the target temperature is reached. In addition to the adjusted region, there are mixed regions that are higher than the target temperature and regions that are lower than the target temperature, and plants that grow excessively due to the uneven temperature and plants that delay growth occur. In order to solve the problem, it was necessary to separately provide a circulation fan for stirring and circulating the air in the room.

  In addition, in order to sufficiently distribute the amount of heat to the indoor space of the agricultural greenhouse, continuing full power operation that maximizes both the heat generation amount and the air volume as in Patent Document 1 increases the cost due to an increase in energy consumption. It becomes a problem.

  This invention solves the above-mentioned subject, and it aims at providing the air conditioning apparatus for agriculture which can distribute heat quantity uniformly to the cultivation space, suppressing consumption energy.

  In order to solve the above problems, the agricultural air conditioner of the present invention outputs the necessary supply heat amount required for forming a temperature environment suitable for plant growth in the cultivation space as a rated supply heat amount. Switchable between a heat source that outputs the rated heat generation that matches the supply heat quantity, a rated air volume output mode that outputs the rated air volume that matches the rated heat generation quantity, and an air volume increase output mode that outputs a predetermined air volume that exceeds the rated air volume as the stirring air volume And a fan device.

  The agricultural air conditioner of the present invention has a control device that controls the fan device, and the control device operates the fan device in the rated air volume output mode and the air volume increase output in a state where the heat source unit outputs the rated heat generation amount. It is characterized by switching to the mode.

  In the agricultural air conditioner of the present invention, a housing containing a heat source, a fan device mounting portion provided on the housing, and an opening interposed between the housing and the fan device and inclined at a predetermined angle with respect to the shaft center A short tubular wind box having a portion is provided, and the fan device is mounted on the fan device mounting portion so that the mounting angle around the axis can be changed, and the fan device is mounted on the opening of the wind box.

  In the agricultural air conditioner of the present invention, a housing containing a heat source, a fan device mounting portion provided on the housing, and a space between the housing and the fan device are bent in any direction with respect to the axis. A flexible wind box is provided, one end opening of the wind box is attached to the fan device mounting portion, and the fan device is attached to the other end opening of the wind box.

  As described above, the agricultural air conditioner of the present invention outputs the necessary supply heat amount as the rated supply heat amount to the cultivation space. This rated supply heat quantity is the product of the discharge temperature commensurate with the rated heat value of the heat source section and the rated air volume of the fan device, and the fan device is operated in the rated air volume output mode with the heat source section outputting the rated heat value. Thus, it is supplied to the cultivation space.

  When temperature unevenness occurs in the cultivation space, that is, the indoor temperature in the near area near the agricultural air conditioner is close to the discharge temperature higher than the set target temperature, and in the far area far from the agricultural air conditioner. When the room temperature becomes lower than the set target temperature and the temperature difference between the two regions is greatly separated, the fan device is switched to the air volume increase output mode for operation.

  When the air volume sent out by the fan device increases, the wind speed of the air flow that carries the heat increases, and the reach of the air flow increases compared to when operating in the rated air volume output mode, and it is possible to carry the heat volume to a farther area. As the air flow passes, the air in the near region in the cultivation space is entrained, the air in the cultivation space is agitated, and the amount of heat that reaches each place in the cultivation space is made uniform. As a result, the temperature difference between the various places in the cultivation space is eliminated, and the growth of the plant can be adjusted under a uniform temperature.

  When operating in the increased air volume output mode, the heat source section maintains the state of outputting the rated heat output, so the air discharge temperature is lower than when operating in the rated air volume output mode, but stirring of the air flow with increased wind speed By receiving the action, a uniform temperature environment can be realized in the cultivation space while suppressing an increase in energy consumption.

The schematic diagram which shows the air conditioning apparatus for agriculture in embodiment of this invention The air conditioner is shown, (a) is a front view, (b) is a side view. Block diagram showing the air conditioner It shows the temperature change in the house, (a) is a graph showing the temperature change at point A and point B when the air flow is higher than the rating, (b) is the point A and B at the rated air flow The graph which shows the temperature change in Figure, (c) is the graph which shows the change of the air flow (A)-(c) is a top view which shows the air conditioning apparatus for agriculture in other embodiment of this invention, respectively. The agricultural air conditioner of (b) of FIG. 4 is shown, (a) is a side view, (b) is a front view, and (c) is a front view. The agricultural air conditioner of (c) of FIG. 4 is shown, (a) is a top view, (b) is a side view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3, an agricultural house 1 is composed of, for example, a greenhouse or an agricultural vinyl house, and forms a cultivation space 2 for cultivating vegetables, fruits, flowers, and the like. Although this Embodiment demonstrates the case where the cultivation space 2 of the agricultural house 1 is heated in winter etc., this invention is applicable also when it cools.

  The agricultural air conditioner 3 outputs a necessary supply heat amount required for forming a temperature environment suitable for plant growth in the cultivation space 2 as a rated supply heat amount, and includes an outdoor unit 4 and an indoor unit 5. Then, two outdoor units 4 and four indoor units 5 are arranged. The outdoor unit 4 includes a heat exchange coil and a compressor, and supplies a heat medium accompanied by the amount of heat to the indoor unit 5.

  The indoor unit 5 includes a heat exchange coil 6 disposed inside a housing 5a that forms a heat source, a fan device 7 disposed on the entire surface of the housing 5a, and a control device 8 disposed on a side of the housing 5a. 6 outputs a rated calorific value corresponding to the rated supply heat amount of the agricultural air conditioner 3. The fan device 7 includes a fan and a motor, and operates in a rated air volume output mode that outputs a rated air volume corresponding to the rated heat generation amount of the heat exchange coil 6, and outputs a predetermined air volume that is equal to or higher than the rated air volume as an agitating air volume. It is possible to switch to operation in the air volume increase output mode.

  The control device 8 operates the fan device 7 in the rated air volume output mode in a state where the heat exchange coil 6 outputs the rated heat generation based on the indoor temperature measured by the temperature sensors 8a arranged in various places of the agricultural house 1. And switch to air volume increase output mode.

  Hereinafter, the operation of the above-described configuration will be described. The agricultural air conditioner 3 outputs a necessary supply heat amount for making the cultivation space 2 an optimum temperature environment for the cultivated plant as a rated supply heat amount.

  This rated supply heat quantity is the product of the discharge temperature commensurate with the rated heat value of the heat exchange coil 6 and the rated air volume of the fan device 7, and the fan device 7 is rated in a state where the heat exchange coil 6 outputs the rated heat value. By operating in the air volume output mode, it is supplied to the cultivation space. This state is as shown in FIG. 1, and the air flow 9 blown from the fan device 7 of each indoor unit 5 does not reach the vicinity of the center of the agricultural house 1.

  The temperature change in the house at the points A and B of the cultivation space 2 at this time is shown in FIG. For example, when the set target temperature is 20 ° C., the discharge temperature of the air flow blown from the fan device 7 is 30 ° C. Thus, since the discharge temperature of the airflow discharged from the fan device 7 is higher than the set target temperature, the room temperature tends to match the set target temperature or higher than the set target temperature at the point A in the near region. On the other hand, at a point B in a far region far from the fan device 7, the temperature is, for example, 15 ° C., which is lower than the set target temperature.

  Since the occurrence of a temperature difference in various places in the cultivation space 2 inhibits the cultivated plants from growing equally, the control device 8 is far away from the room temperature measured by temperature sensors placed in various places in the agricultural house 1. In order to do so, the fan device 7 is operated by switching to the air volume increase output mode.

In the air volume increase output mode, as shown in FIG. 4C, the fan device 7 outputs a predetermined air volume that is equal to or higher than the rated air volume, for example, 50%, as the agitation air volume.
An increase in the amount of air sent out by the fan device 7 causes an increase in the wind speed of the air flow. For this reason, the wind speed of the airflow that carries the amount of heat generated from the heat exchange coil 6 increases, and the reach of the airflow increases compared to when operating in the rated airflow output mode, so that the amount of heat is carried to a farther distant area. The air in the vicinity of the cultivation space 2 near the fan device 7 is entrained with the passage of the air flow, the air in the cultivation space 2 is agitated, and the amount of heat that reaches the various places in the cultivation space 2 Is made uniform. As a result, the temperature difference between the places in the cultivation space 2 is eliminated, and the growth of the plant can be adjusted under a uniform temperature.

  During operation in the air volume increase output mode, the heat exchange coil 6 maintains the state of outputting the rated heat generation amount, so that the air discharge temperature is reduced to 26 ° C., for example, compared to when operating in the rated air volume output mode. However, by receiving the stirring action of the air flow with increased wind speed, as shown in FIG. 4A, at the point A in the near area of the fan device 7 and the point B in the far area far from the fan device 7. The room temperature reaches the set target temperature. Therefore, a uniform temperature environment can be realized in the cultivation space 2 while suppressing the increase in energy consumption by maintaining the state of outputting the rated heat generation amount without increasing the heat generation amount of the heat exchange coil 6.

  Next, another embodiment of the present invention will be described. The agricultural air conditioner described below is basically the same as that described in the previous embodiment, and the same members are denoted by the same reference numerals and the description thereof is omitted.

  In FIG. 5A, the fan device 7 is joined by a hinge 9 to the fan device mounting portion 5b that forms the front surface of the housing 5a of the indoor unit 5, and the fan device 7 is opened and closed in the form of a single door. It is provided as possible. A spray pipe 10 for cleaning the heat exchange coil 6 is provided inside the housing 5a.

  According to this configuration, the heat exchange coil 6 can be easily performed from the inside of the housing 5 a by the cleaning liquid sprayed from the spray pipe 10, and maintenance is facilitated by opening the fan device 7.

  FIG. 5B and FIG. 6 show that a wind box 11 is interposed between the fan device mounting portion 5 b of the housing 5 a and the fan device 7. The wind box 11 has a short tubular shape and has an opening 12 that is inclined at a predetermined angle with respect to the axis, and a flange 13 on the base end side that forms an opening perpendicular to the axis. The flange 13 is detachably attached to the fan device mounting portion 5b with a bolt 14, and the fan device 7 is provided in the opening 12.

  According to this configuration, the air flow sent out from the fan device 7 is blown out in a direction inclined with respect to the axis of the wind box 11. The direction of the fan device 7 is changed to an arbitrary direction around the axis of the wind box 11 by changing the mounting angle around the axis of the wind box 11 with respect to the fan device mounting portion 5b with the bolt 14 removed. The direction of the air flow sent out from the fan device 7 can be adjusted. Moreover, as shown in FIG.6 (c), the attachment angle of the wind box 11 can be changed in the state which loosens the bolt 14, by making the shape of the bolt hole 13a provided in the flange 13 into a long hole.

  FIG. 5C and FIG. 7 show that a wind box 21 that can be expanded and contracted is interposed between the fan device mounting portion 5b of the housing 5a and the fan device 7. Here, the wind box 21 is a bellows. If it is flexible and can be bent in any direction, it is not limited to the bellows shape.

  One side portion of the fan device 7 is joined to the fan device mounting portion 5 b by a hinge 22, and the fan device 7 can swing around the axis of the hinge 22. The other side of the fan device is joined to the fan device mounting portion 5b via an angle adjusting portion 23 formed of a multi-node link mechanism. The angle adjusting portion 23 tightens or loosens the adjusting screw 24 to thereby connect the multi-node link. The mechanism expands and contracts.

  According to this configuration, when the other side portion of the fan device 7 is pushed forward by the extension of the angle adjusting unit 23, the fan device 7 swings around the axis of the hinge 22 with the deformation of the wind box 21, The direction of the device 7 can be changed to an arbitrary direction around the axis of the hinge 22, and the direction of the air flow sent out from the fan device 7 can be adjusted.

DESCRIPTION OF SYMBOLS 1 Agricultural house 2 Cultivation space 3 Agricultural air conditioner 4 Outdoor unit 5 Indoor unit 5a Housing 5b Fan device mounting part 6 Heat exchange coil 7 Fan device 8 Control device 8a Temperature sensor 9 Hinge 10 Spray piping 11 Wind box 12 Opening Part 13 Flange 13a Bolt hole 14 Bolt 21 Wind box 22 Hinge 23 Angle adjustment part 24 Adjustment screw

Claims (4)

In the cultivation space, the necessary supply heat amount required for forming a temperature environment suitable for plant growth is output as the rated supply heat amount,
Switch between the heat source that outputs the rated heat generation that matches the rated heat supply, the rated airflow output mode that outputs the rated airflow that matches the rated heat generation, and the airflow increase output mode that outputs the predetermined airflow that exceeds the rated airflow as the stirring airflow An agricultural air conditioner comprising a possible fan device.   A control device for controlling the fan device, wherein the control device switches the operation of the fan device between a rated air volume output mode and an air volume increase output mode in a state where the heat source unit outputs a rated heat generation amount. Item 2. The agricultural air conditioner according to Item 1.   A housing containing a heat source, a fan device mounting portion provided on the housing, and a short tubular wind box having an opening that is interposed between the housing and the fan device and is inclined at a predetermined angle with respect to the axis. The agricultural air conditioner according to claim 1 or 2, wherein a wind box is mounted on the fan device mounting portion so that the mounting angle around the axis can be changed, and a fan device is mounted on the opening of the wind box. apparatus.   A housing containing the heat source, a fan device mounting portion provided on the housing, a flexible wind box that is interposed between the housing and the fan device and can be bent in any direction with respect to the axis, The agricultural air conditioner according to claim 1 or 2, wherein one end opening of the wind box is attached to the fan device mounting portion, and the fan device is attached to the other end opening of the wind box.

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