JP4344461B2 - Hot air heater for horticultural house - Google Patents
Hot air heater for horticultural house Download PDFInfo
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- JP4344461B2 JP4344461B2 JP2000220249A JP2000220249A JP4344461B2 JP 4344461 B2 JP4344461 B2 JP 4344461B2 JP 2000220249 A JP2000220249 A JP 2000220249A JP 2000220249 A JP2000220249 A JP 2000220249A JP 4344461 B2 JP4344461 B2 JP 4344461B2
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- blower
- temperature
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- hot air
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Description
【０００１】
【発明の属する技術分野】
本発明は、作物を栽培する施設園芸ハウス（以下、単にハウスと略称する。）の内部を温風で暖房するための温風暖房機に関し、更に詳しくは、熱交換部を備え送風機により温風をハウス内へ送り出すようにした温風暖房機に関するものである。
【０００２】
【従来の技術】
通常、この種の温風暖房機では、ハウス内に設置された温度センサーからの情報により熱交換部におけるバーナーをオン・オフすることにより、ハウス内の温度を設定温度（管理温度）に維持する仕組みになっている。
即ち、図３の熱交換部における温度推移を説明する運転状態図に示すごとく、
▲１▼暖房オンの指令が出された時、或いはハウス内の温度が設定温度より低いと熱交換部におけるバーナーの燃焼が開始され、▲２▼設定温度でもって定常運転（バーナー燃焼と送風機による温度バランスが平衡状態にある運転）が維持される。そうして、▲３▼暖房オフの指令が出されるか、或いはハウス内の温度が設定温度より高くなると、直ちにバーナーの燃焼が停止されると共に、▲４▼送風機からは熱交換部を冷却するべく所定の時間（図３のＳで示す時間＝通常約６分間）送風が継続され、▲５▼所定時間経過後に送風機が停止し、熱交換部がハウス内の温度と同じ常温状態になる。この様な運転を繰り返すことにより、ハウス内の温度が設定温度に維持される仕組みになっている。
【０００３】
しかし、この種の温風暖房機では、負荷が大きい場合（図３の実線（Ａ）で示した運転時）を基準にして設計されているために、負荷の少ない小型のハウスで使用する場合や春先または秋口など比較的負荷が少なくて済む場合（図３の破線（Ｂ）で示した運転時）において、負荷が大きい場合と比較して熱交換部の冷却時間が短くて済むにも拘わらず送風（冷風運転）時間が長くなることになり、その為、送風機の送風口に近い部分の作物に生育障害が生じたり、生育障害を避けるために送風口の配置に特別な工夫が必要となることがあった。
【０００４】
【発明が解決しようとする課題】
本発明はこのような従来の不具合に鑑みてなされたものであり、バーナーの燃焼を停止した後において、ハウス負荷の大小に関係なく、送風機からの送風温度が設定温度以下になる惧れがない施設園芸ハウス用温風暖房機を提供せんとするものである。
【０００５】
【課題を解決するための手段】
斯かる目的を達成する本発明第１発明の施設園芸ハウス用温風暖房機は、熱交換部を備え送風機により温風をハウス内へ送り出すようにした温風暖房機において、暖房オフの指令に基づいて前記熱交換部のバーナーを停止した後も前記送風機における送風動作を所定時間継続させると共に、該送風機の送風温度を設定温度と比較して低くなった場合には上記設定時間に関係なく前記送風機における送風動作を停止させるようにした事を特徴としたものである。
また、本発明第２発明の施設園芸ハウス用温風暖房機は、暖房オフの指令に基づいて前記熱交換部のバーナーを停止した後も前記送風機における送風動作を所定時間継続させると共に、該送風機の送風温度を設定温度と比較して低くなった場合に上記設定時間に関係なく前記送風機における送風量を徐々に減少させるようにした事を特徴としたものである。
【０００６】
【発明の実施の形態】
以下、本発明の具体的な好適実施例を図面に示したフロー図に従って詳細に説明するが、本発明は係る実施例のものに限定されるものではない。
また、本温風暖房機を構成している熱交換部におけるバーナーや送風機などの具体的構造について格別に図示しなかったが、基本的に従来品と同様であるのでその説明を省略する。また、バーナーや送風機など時間や温度によりオン・オフ動作する構成部材は、従来品と同様にリレーによるシーケンス制御によりコントロールされるか、またはコンピュータによりコントロールされている。
【０００７】
暖房オンの指定を出すか、或いはハウス内の温度が設定温度より低いと、ハウス内に設置された温度センサーから熱交換部におけるバーナー燃焼と送風機運転の指令が出され、バーナーの燃焼が開始されると同時に送風機が運転を開始し、熱交換部における温度が図３に示すごとく▲１▼から▲２▼の設定温度に上昇する。
設定温度による定常運転（バーナー燃焼と送風機による温度バランスが平衡状態にある運転）は、暖房オフの指令が出されるまで維持される。
そうして、暖房オフの指令が出されるか、或いはハウス内の温度が設定温度より高くなると、バーナーの燃焼が直ちに停止され、熱交換部の温度が図３における▲３▼から▲４▼へと下降を開始するようになる。
【０００８】
この際、熱交換部を強制的に冷却するべく、図１に示した熱交換部の冷却フローチャートのごとく、ステップ１で熱交換部におけるバーナーの燃焼を停止した後も、送風機における送風動作を所定時間（図３において「Ｓ」で示す時間、通常約５〜１０分間）継続させる（ステップ２）と共に、送風機から吐出される送風温度を施設園芸ハウス用温風暖房機の送風口に設けた温度センサーで検出して、送風温度Ｔを送風設定温度ｔと比較して、過冷とならないようにする。
【０００９】
すなわち、ステップ３において送風機の送風時間を送風設定時間Ｓと比較し、送風機の送風時間が送風設定時間Ｓを経過した場合には、ステップ４に移行させて送風機の送風運転を直ちに停止せしめ、熱交換部の冷却運転を停止させる（ステップ５）。また、送風機の送風時間が設定時間Ｓを経過していない場合には、ステップ６に移行させて送風機から吐出される送風温度Ｔと送風設定温度ｔとを比較する。その結果、送風温度Ｔが送風設定温度ｔよりも高い場合にはステップ３に戻され、送風温度Ｔが送風設定温度ｔよりも低い場合にはステップ７に移行し、上記送風運転の設定時間Ｓに関係なく送風機の送風運転を直ちに停止せしめて、熱交換部の冷却運転を停止するものである。
この様な送風機のオン・オフ動作を、設定時間Ｓの間繰り返す（図２参照）。
【００１０】
以上の説明（第１発明）では、送風機による送風運転を送風機のオン・オフ制御するようにしたが、送風機の送風温度を設定温度と比較して低くなった場合に、送風設定時間に関係なく送風機における送風量を徐々に減少させるようにしても良い（第２発明）。
【００１１】
【発明の効果】
本発明に係る施設園芸ハウス用温風暖房機は斯様に、熱交換部を備え送風機により温風をハウス内へ送り出すようにした温風暖房機において、暖房オフの指令に基づいて熱交換部のバーナーを停止した後も送風機における送風動作を所定時間継続させると共に、該送風機の送風温度を設定温度と比較して低くなった場合には上記設定時間に関係なく送風機における送風動作を停止させるか又は送風量を徐々に減少させるようにしたので、バーナーの燃焼を停止した後において、送風機からの送風温度が設定温度以下になるような惧れがなくなる。このことは、ハウス負荷の大小に関係なく維持することが可能であり、よって、送風機の送風口に近い部分の作物に生育障害が生じたり、生育障害を避けるために送風口の配置に特別な工夫を必要とするようなことがなくなる。
【図面の簡単な説明】
【図１】 本発明実施の一例を示す熱交換部の冷却フロー図。
【図２】 送風機のオン・オフ動作を説明する図。
【図３】 熱交換部における温度推移を説明する運転状態図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a warm air heater for heating the inside of a facility horticulture house (hereinafter simply abbreviated as a house) for cultivating crops with warm air. It is related with the warm air heater which sent out the inside of a house.
[0002]
[Prior art]
Normally, in this type of hot air heater, the temperature in the house is maintained at the set temperature (management temperature) by turning on / off the burner in the heat exchange section based on information from a temperature sensor installed in the house. It is structured.
That is, as shown in the operation state diagram for explaining the temperature transition in the heat exchange section of FIG.
(1) When a heating-on command is issued, or when the temperature in the house is lower than the set temperature, combustion of the burner in the heat exchanging section is started. (2) Steady operation (with burner combustion and blower) at the set temperature Operation in which the temperature balance is in equilibrium is maintained. Then, when (3) the heating off command is issued or the temperature in the house becomes higher than the set temperature, the combustion of the burner is stopped immediately and (4) the heat exchanger is cooled from the blower. Therefore, the air blowing is continued for a predetermined time (time indicated by S in FIG. 3 = normally about 6 minutes). (5) After the predetermined time has elapsed, the blower is stopped, and the heat exchanging portion becomes a room temperature that is the same as the temperature in the house. By repeating such operation, the temperature inside the house is maintained at the set temperature.
[0003]
However, this type of hot air heater is designed based on a heavy load (during the operation shown by the solid line (A) in FIG. 3), so that it is used in a small house with a small load. When the load is relatively small (such as the operation indicated by the broken line (B) in FIG. 3) such as in early spring or autumn, the cooling time of the heat exchange unit can be shortened compared with the case where the load is large. The air blow (cold wind operation) time will be longer, and therefore, the crop near the blower vent of the blower will be damaged by growth, or special arrangements will be required for the arrangement of the blow vent to avoid the growth hindrance. There was.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such conventional problems, and after stopping the burner combustion, there is no possibility that the temperature of the air blown from the blower becomes lower than the set temperature regardless of the size of the house load. It is intended to provide hot air heaters for facilities gardening houses.
[0005]
[Means for Solving the Problems]
A hot air heater for a facility horticulture house according to the first invention of the present invention that achieves such an object is a hot air heater that includes a heat exchanging unit and sends out hot air into the house by a blower. After continuing the air blowing operation in the blower for a predetermined time even after stopping the burner of the heat exchanging unit based on the above, when the air blowing temperature of the blower is lower than the set temperature, This is characterized in that the blowing operation in the blower is stopped.
Further, the hot air heater for a horticultural house according to the second aspect of the present invention continues the air blowing operation in the air blower for a predetermined time after stopping the burner of the heat exchanging unit based on the heating off command. When the blast temperature is lower than the set temperature, the blast volume in the blower is gradually reduced regardless of the set time.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific preferred embodiments of the present invention will be described in detail with reference to the flowcharts shown in the drawings, but the present invention is not limited to the embodiments.
Moreover, although it did not show in particular about specific structures, such as a burner and an air blower in the heat exchange part which comprises this warm air heater, since it is the same as that of a conventional product fundamentally, the description is abbreviate | omitted. In addition, components such as a burner and a blower that are turned on and off depending on time and temperature are controlled by a sequence control using a relay, or controlled by a computer, as in the conventional product.
[0007]
If heating is turned on or the temperature in the house is lower than the set temperature, the temperature sensor installed in the house issues a burner combustion and blower operation command in the heat exchange section, and combustion of the burner is started. At the same time, the blower starts operation, and the temperature in the heat exchange section rises from (1) to (2) as shown in FIG.
Steady operation at the set temperature (operation in which the temperature balance between the burner combustion and the blower is in an equilibrium state) is maintained until a heating-off command is issued.
Then, when a heating off command is issued or the temperature in the house becomes higher than the set temperature, combustion of the burner is immediately stopped, and the temperature of the heat exchanging section is changed from (3) to (4) in FIG. And start to descend.
[0008]
At this time, in order to forcibly cool the heat exchanging section, as shown in the cooling flowchart of the heat exchanging section shown in FIG. 1, after the burner combustion in the heat exchanging section is stopped in step 1, the blowing operation in the blower is predetermined. The temperature (time indicated by “S” in FIG. 3, usually about 5 to 10 minutes) is continued (step 2), and the air temperature discharged from the air blower is provided at the air outlet of the hot air heater for the facility horticulture house It detects with a sensor and compares the ventilation temperature T with the ventilation setting temperature t, and prevents it from overcooling.
[0009]
That is, in
Such an on / off operation of the blower is repeated for a set time S (see FIG. 2).
[0010]
In the above description (first invention), the blower operation by the blower is controlled to be turned on / off. However, when the blower air temperature of the blower is lower than the set temperature, the blower set time is not concerned. You may make it reduce the ventilation volume in an air blower gradually (2nd invention).
[0011]
【The invention's effect】
The hot air heater for a horticultural horticultural house according to the present invention is thus provided with a heat exchanging unit, and the hot air heater is configured to send out hot air into the house by a blower. Whether the blower operation in the blower is continued for a predetermined time after the burner is stopped, and if the blower temperature of the blower is lower than the set temperature, the blower operation in the blower is stopped regardless of the set time. Alternatively, since the blast volume is gradually reduced, there is no possibility that the blast temperature from the blower becomes lower than the set temperature after the combustion of the burner is stopped. This can be maintained regardless of the size of the house load. Therefore, a crop failure in the portion near the blower vent of the blower may cause a growth failure or a special arrangement of the blower vent to avoid the growth failure. No need for ingenuity.
[Brief description of the drawings]
FIG. 1 is a cooling flow diagram of a heat exchange section showing an example of the present invention.
FIG. 2 is a diagram for explaining an on / off operation of a blower.
FIG. 3 is an operational state diagram illustrating temperature transition in a heat exchange unit.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000220249A JP4344461B2 (en) | 2000-07-21 | 2000-07-21 | Hot air heater for horticultural house |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000220249A JP4344461B2 (en) | 2000-07-21 | 2000-07-21 | Hot air heater for horticultural house |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002034355A JP2002034355A (en) | 2002-02-05 |
| JP4344461B2 true JP4344461B2 (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000220249A Expired - Lifetime JP4344461B2 (en) | 2000-07-21 | 2000-07-21 | Hot air heater for horticultural house |
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| Country | Link |
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| JP (1) | JP4344461B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006296298A (en) * | 2005-04-20 | 2006-11-02 | Kihara Seisakusho:Kk | Warm air heating system for facility horticultural house |
| EP2017528A1 (en) | 2006-05-01 | 2009-01-21 | Shinka Co. Ltd. | Combustor of hydrocarbon based fuel and device comprising combustor of hydrocarbon based fuel as heat generation source |
| JP5240005B2 (en) * | 2009-03-30 | 2013-07-17 | 三菱電機株式会社 | Air conditioning system |
| JP5557708B2 (en) * | 2010-11-18 | 2014-07-23 | 三州産業株式会社 | Hot air heater for facility horticulture and its cooling control method |
| JP2013053845A (en) * | 2012-11-12 | 2013-03-21 | Mitsubishi Electric Corp | Air-conditioning system |
-
2000
- 2000-07-21 JP JP2000220249A patent/JP4344461B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2002034355A (en) | 2002-02-05 |
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