JPH02103331A - Ceiling embodies type air conditioner - Google Patents
Ceiling embodies type air conditionerInfo
- Publication number
- JPH02103331A JPH02103331A JP63255172A JP25517288A JPH02103331A JP H02103331 A JPH02103331 A JP H02103331A JP 63255172 A JP63255172 A JP 63255172A JP 25517288 A JP25517288 A JP 25517288A JP H02103331 A JPH02103331 A JP H02103331A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- ceiling
- air
- time
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007664 blowing Methods 0.000 claims description 22
- 238000013459 approach Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
Landscapes
- Air-Flow Control Members (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は天井埋込型空気調和機、特にその吹出し角度の
制御に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ceiling-embedded air conditioner, and particularly to control of the air outlet angle thereof.
従来の技術
従来の技術について第6図から第8図を用いて説明する
。1は天井埋込型の空気調和機の室内機であシ、天壁2
に固定ボルト3によシ個定され、室内機1の下面は天井
4と略同−面上に開口している。室内機1は外殻5と下
面グリル6とから構成し、その内部には冷却システムの
室内側熱交換器7a、7bが、またその各々と熱交換可
能な様に送風機8を設置している。Prior Art The conventional technology will be explained with reference to FIGS. 6 to 8. 1 is an indoor unit of a ceiling-embedded air conditioner, ceiling wall 2
The lower surface of the indoor unit 1 is opened substantially on the same plane as the ceiling 4. The indoor unit 1 is composed of an outer shell 5 and a lower grille 6, and indoor heat exchangers 7a and 7b of the cooling system are installed inside the indoor unit 1, and a blower 8 is installed so as to be able to exchange heat with each of them. .
そして下面グリル6の中央部に方形状の吸込口10を設
け、吸込口1oの周囲には吹出しグリル11a、11b
を設けている。送風機8から吹出した空気の略半分は熱
交換器7aを通ったのち、吹出しグリル11aを通過し
、斜め下前方へと吹き出す。また送風機8から吹出した
残シの空気は熱交換器7bを通シ、吹出しグリル11b
を通過し斜め下前方へと吹出す様な構造としている。A rectangular suction port 10 is provided in the center of the lower grille 6, and outlet grilles 11a, 11b are provided around the suction port 1o.
has been established. Approximately half of the air blown from the blower 8 passes through the heat exchanger 7a, passes through the blowout grille 11a, and blows out diagonally downward and forward. In addition, the remaining air blown from the blower 8 is passed through the heat exchanger 7b, and the air is passed through the air outlet grill 11b.
The structure is such that the air passes through the air and blows out diagonally downward and forward.
また各々の吹出し風向をコントロールするため可動式の
ルーバ12a、12bを設置している。Furthermore, movable louvers 12a and 12b are installed to control the direction of each blowout air.
そして、使用者が任意の室温に設定可能な様なリモコン
タイプの温度設定手段100を設けている。A remote control type temperature setting means 100 is provided which allows the user to set the room temperature to any desired temperature.
吸込口1oの内部には、吸込温度上ンサ13を固定設置
しており、吸込温度を測定するとともに温度設定手段1
00による設定温度との温度差を検出し、冷却システム
を0N−OFFさせ室内を略−様に保っている。A suction temperature sensor 13 is fixedly installed inside the suction port 1o to measure the suction temperature and also to set the temperature setting means 1.
The temperature difference between the set temperature and the temperature set by 00 is detected, and the cooling system is turned off to maintain the inside of the room at approximately -.
この様に構成する従来の天井埋込型の空気調和機の動作
について説明する。The operation of the conventional ceiling-embedded air conditioner configured in this manner will be explained.
一般的に天井埋込型空気調和機は事務所や店舗あるいは
居室の天井部に設置されることが多く、室14の温度調
節を行なう。Generally, a ceiling-embedded air conditioner is often installed on the ceiling of an office, store, or living room, and controls the temperature of the room 14.
室14は、天井4.側壁15,16、及び床17よシ構
成している。又、第8図の二点鎖線に囲まれた空間が居
住域であり、ASHRAEの5TANDARDでは、高
さ18ooIIrII以下でかつ側壁から600U以上
離れた空間を居住域と定義している。つまシム間はおお
むねこの居住域で活動すると定義している。The room 14 has a ceiling 4. It consists of side walls 15, 16 and a floor 17. Furthermore, the space surrounded by the two-dot chain line in FIG. 8 is the living area, and in ASHRAE's 5TANDARD, the living area is defined as a space with a height of 18ooIIrII or less and a distance of 600U or more from the side wall. It is defined that the Tsuma Sims generally operate in this residential area.
このときの吹出空気の流線は、第8図の様に、熱交換器
7a、7bによシ暖められた(冷房時は冷やされた)空
気が、吹出しグリル11a、11bから斜め下方に吹出
し、居住域内で大きな弧を描く様に、室14内を暖め(
冷やし)たのち室内機1の中央の吸込口10よυ吸込ま
れる。このとき、各吹出し気流a、及びbは路間−の吹
出し風量。At this time, the flow lines of the blown air are such that the air heated by the heat exchangers 7a and 7b (cooled during cooling) is blown diagonally downward from the air outlet grilles 11a and 11b. , the interior of the room 14 is heated in a large arc within the living area (
cooling) and then sucked into the central suction port 10 of the indoor unit 1. At this time, each of the blown air flows a and b is the blown air volume between the roads.
吹出し方向であり、気流a、bの流線はいずれも略同様
の弧を描く。This is the blowing direction, and the streamlines of airflows a and b both draw approximately the same arc.
この様にして吸込まれた空気の温度を吸込温度センサ1
3により検知することによシ、吹出し空気温度を調節し
、室14の居住域内の平均温度をほぼ設定温度に維持す
るものであった。The temperature of the air sucked in this way is measured by the suction temperature sensor 1.
3, the temperature of the blown air is adjusted to maintain the average temperature in the living area of the room 14 at approximately the set temperature.
発明が解決しようとする課題
店舗や事務所、あるいは居室の天井は床から2.5〜3
ffの高さであシ、この位置に室内機が設置されたとき
、暖房時は空気の比重量の影響で、高温の空気が天井付
近によどみ、人間の活動範囲である居住域よりも上方の
天井付近を無駄に暖房してしまうので、非常に効率の悪
い暖房となシ、ランニングコストが高くなるという問題
があった。Problems that the invention aims to solve The ceiling of a store, office, or living room is 2.5 to 3 cm above the floor.
When the indoor unit is installed in this position, the high temperature air stagnates near the ceiling due to the specific weight of the air during heating, and the air rises above the living area, which is the area of human activity. Since heating is wasted near the ceiling of the room, there is a problem of extremely inefficient heating and high running costs.
本発明は上記問題点を解決するもので、同一ランニング
コストで、良好な室内の温度分布が得られる天井埋込型
空気調和機を提供することを目的とする。The present invention solves the above-mentioned problems, and aims to provide a ceiling-embedded air conditioner that can provide a good indoor temperature distribution at the same running cost.
課題を解決するための手段
この目的を達成するために本発明の天井埋込型空気調和
機は、運転時間を積算する運転時間積算手段と、吹出し
角度を制御する吹出し角度切替手段とを備えたものであ
る。Means for Solving the Problems In order to achieve this object, the ceiling-embedded air conditioner of the present invention is provided with an operating time accumulating means for accumulating operating time, and an air blowing angle switching means for controlling an air blowing angle. It is something.
作 用
この構成によって、暖房運転開始一定時間経過後、室内
温度が安定し、高温の空気が天井付近によどみ始めると
、運転時間積算手段よシ信号を吹出し角度切替手段に送
シ、一定時間のみ温風を天井と略水平に吹出すよう制御
する。With this configuration, after a certain period of time has elapsed from the start of heating operation, when the indoor temperature stabilizes and high-temperature air begins to stagnate near the ceiling, the operating time integrating means sends a signal to the blow-off angle switching means, and the operation is performed only for a certain period of time. Controls the hot air so that it blows out approximately parallel to the ceiling.
このことにより、温風は、天井付近の高温空気と共に天
井→側壁→床面に沿って流れ、大きなサーキュレーシジ
ンを発生して室内機の吸入口に吸込まれる。As a result, the hot air flows along the ceiling, side wall, and floor surface together with the high temperature air near the ceiling, generates a large circulation sine, and is sucked into the intake port of the indoor unit.
実施例
以下本発明の一実施例を第1図から第6図によシ説明す
る。尚、従来と同一のものについては説明を省略し、異
なる点のみについて述べる。EXAMPLE An example of the present invention will be explained below with reference to FIGS. 1 to 6. Note that explanations of the same components as those of the prior art will be omitted, and only the different points will be described.
第1図は本発明の一実施例を示す構成図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
18は室内温度設定手段で、19はリモコンに設けられ
た運転時間積算手段で、あらかじめ設定された時間が経
過すれば、吹出し角度切替手段20a、20bに信号を
送り、前記吹出し角度切替手段20a、20bは、信号
に基づいて、ルーバ12a、12bの角度を変更するも
のである。Reference numeral 18 denotes an indoor temperature setting means, and reference numeral 19 denotes an operation time integration means provided on the remote control, which sends a signal to the blowout angle switching means 20a, 20b when a preset time has elapsed, and the blowout angle switching means 20a, 20b changes the angle of the louvers 12a, 12b based on the signal.
第2図に示すように、前記吹出し角度切替手段20aは
、パルスモータ22&の先端部にメネジを切ったモータ
シャフト21aのメネジに、ルーバの駆動シャフト23
aのオネジを螺嵌する構成である。As shown in FIG. 2, the blowing angle switching means 20a is connected to a female thread of a motor shaft 21a which has a female thread at the tip of a pulse motor 22&.
This is a configuration in which the male screw of a is screwed into.
次に上記のように構成した天井埋込型空気調和機の動作
を第3図のフローチャートを用いて説明する。Next, the operation of the ceiling-embedded air conditioner configured as described above will be explained using the flowchart shown in FIG.
前記室14を使用する人が、空気調和ta1の電源を投
入したのち、ステップ24で所望の室温”setに温度
設定し、ステップ26で空調機の運転を開始する。After the person using the room 14 turns on the power to the air conditioner ta1, the temperature is set to a desired room temperature "set" in step 24, and the operation of the air conditioner is started in step 26.
そして、ステップ2eで初期設定である、斜め下吹出し
を行ない、ステップ27で運転時間を積算する。Then, in step 2e, diagonal downward blowing is performed, which is the initial setting, and in step 27, the operating time is integrated.
あらかじめ設定された時間θを経過するまでは、ステッ
プ28でNoの方向に進む。時間θを経過後は、ステッ
プ28でYE3D方向に進み、ステップ29で吹出し角
度切替手段20a、20bによりルーバ12a、12b
を駆動させ、吹出し方向を天井面と略水平になるよう設
定する。この状態で運転時間積算手段19によシ、一定
時間水平吹出し運転を行なった後、ステップ30で運転
終了の判定をし、終了でなければ、Noの方向に進み、
再度ステップ26で斜め下吹出しを行なう。このような
吹出し方向の切替えをステップ30で電源OFFでYE
Sの方向に進むまで繰υ返す。この結果、運転開始初期
のような立上シ運転時には、ルーバ12a、12bの角
度を大きくとるため、第4図に示すように温調された空
気を直接居住域内に吹出すことが可能であシ、居住域を
すばやく設定温度に近づけることができる。Until the preset time θ has elapsed, the process proceeds in the direction of No in step 28. After the time θ has elapsed, the flow advances in the YE3D direction in step 28, and in step 29, the blowing angle switching means 20a, 20b are used to control the louvers 12a, 12b.
, and set the blowing direction so that it is approximately parallel to the ceiling surface. In this state, after the operation time accumulating means 19 performs horizontal blowing operation for a certain period of time, it is determined in step 30 whether the operation has ended, and if the operation has not ended, proceed in the direction of No.
Diagonal downward blowing is performed again in step 26. To switch the blowing direction like this, turn off the power in step 30 and press YES.
Repeat υ until you move in the direction of S. As a result, during start-up operation such as at the beginning of operation, the angles of the louvers 12a and 12b are set large, so that temperature-controlled air can be blown directly into the living area as shown in Figure 4. The temperature of the living area can be brought close to the set temperature quickly.
そして室14の温度がほぼ設定温度に近づくと高温の空
気が天井付近によどみ初める。この時間を運転時間積算
手段19で判定し、前記吹出し角度切替手段2oa、2
obによりルーバ12a。When the temperature of the chamber 14 approaches the set temperature, the high temperature air begins to stagnate near the ceiling. This time is determined by the operating time integrating means 19, and the blowing angle switching means 2oa, 2
Louver 12a by ob.
12bを駆動させ、吹出し方向を天井面と略水平になる
よう設定する。このため、吹出した温風(冷風)は第6
図に示すように天井4に沿って流れ、対向する側壁15
.16の上部にぶつかる。12b is driven and the blowing direction is set to be approximately parallel to the ceiling surface. Therefore, the hot air (cold air) blown out is
Flows along the ceiling 4 and opposing side walls 15 as shown in the figure.
.. Hit the top of 16.
そして、ぶつかった流れは下方の流れに変化し、側壁1
5.16に沿って下方に流れていく。そして、床面17
に到達したのち床面17を広が9ながら、室内機1の吸
込口10から吸込まれていき、室14内全体に大きなサ
ーキュレーションを発生させる。このため居住域に強風
が発生せず、室14の壁に近い外殻からソフトな温調が
可能となる。Then, the colliding flow changes to a downward flow, and the side wall 1
It flows downward along 5.16. And floor surface 17
After reaching this point, the air spreads across the floor 17 and is sucked in through the suction port 10 of the indoor unit 1, generating large circulation throughout the room 14. Therefore, strong winds do not occur in the living area, and soft temperature control is possible from the outer shell near the wall of the room 14.
上記実施例によれば、運転開始初期には、吹出方向を斜
め下方に向けて、居住域内に温調された空気を直接吹き
こんでやり、早く所望の温度に到達するように制御する
。According to the above embodiment, at the beginning of operation, temperature-controlled air is directly blown into the living area with the blowing direction directed diagonally downward, and control is performed so that the desired temperature is quickly reached.
一方、室14の温度が設定温度に近づけば、吹出し方向
を天井4に略水平とし、吹出し空気は、天井面に沿って
流れるので、風速が減少しにくく、天井面を沿いながら
側壁15.16上端に到達したのち、側壁15.16に
沿って下方に流れてぃき床面17をへて、室内機1の吸
込口10に吸込まれていく。この結果、室14には壁面
に沿った大きなサーキュレーションが発生する。つまシ
室14がほぼ安定した温度に到達すれば、吹出しを居住
域外の天井付近とし、居住域を外殻から温調することに
なる。又、壁に沿った流れであυ、気流は減速しに<<
、確実にサーキュレーションするので室内はより均一な
温度分布にすることが可能である。On the other hand, when the temperature of the chamber 14 approaches the set temperature, the blowing direction is set approximately parallel to the ceiling 4, and the blowing air flows along the ceiling surface, so the wind speed is difficult to decrease, and the air blows along the ceiling surface while moving toward the side walls 15, 16. After reaching the upper end, it flows downward along the side walls 15 and 16, passes through the floor surface 17, and is sucked into the suction port 10 of the indoor unit 1. As a result, large circulation occurs in the chamber 14 along the wall surface. When the temperature in the shoe room 14 reaches a substantially stable temperature, the air outlet is placed near the ceiling outside the living area, and the temperature of the living area is controlled from the outer shell. In addition, the airflow slows down due to the flow along the wall.<<
Since the circulation is ensured, it is possible to achieve a more uniform temperature distribution indoors.
特に暖房時には天井4付近に高温空気が滞留しやすく、
頭よシずっと上方を無駄に温めていた。Especially during heating, high temperature air tends to stay near the ceiling 4.
My head was wasting heat all the time.
この様な高温空気を、水平吹出し流により吹きとばし、
居住域内へと運ぶので、効率の良い暖房を可能とする。This kind of high-temperature air is blown away by a horizontal blowout flow,
Since it is carried into the living area, efficient heating is possible.
尚、本実施例では、ルーバ12a、12bの駆動をパル
スモータ22a、22bを用いて行なっているが、形状
記憶合金等を用いて、ルーバ12a。In this embodiment, the louvers 12a and 12b are driven using pulse motors 22a and 22b, but the louvers 12a are driven using a shape memory alloy or the like.
12bを駆動させることも可能である。It is also possible to drive 12b.
発明の効果
以上のように本発明は、運転時間を積算する運転時間積
算手段と、吹出し角度を制御する吹出し角度切替手段と
を備え、前記運転時間積算手段からの出力信号に基づき
、運転時間の積算値があらかじめ設定された時間になれ
ば、一定時間のみ吹出し角度が天井と略水平になるよう
に制御する。Effects of the Invention As described above, the present invention includes an operating time accumulating means for accumulating the operating time and an air blowing angle switching means for controlling the blowing angle, and the operating time is determined based on the output signal from the operating time accumulating means. When the integrated value reaches a preset time, the blowing angle is controlled to be approximately parallel to the ceiling for a certain period of time.
このことによって、暖房時に天井4付近に高温空気が滞
留しやすく、頭よりずっと上方を無駄に温めていたが、
この高温空気を、水平吹出し流により吹きとばし、居住
域内へと運ぶので上下方向の温度分布を良くすると共に
効率の良い暖房が可能となシ、省エネルギーが可能であ
る。As a result, high-temperature air tended to stay near the ceiling 4 during heating, unnecessarily heating the area above the head.
This high-temperature air is blown away by a horizontal blowout flow and carried into the living area, which improves the temperature distribution in the vertical direction and enables efficient heating and energy savings.
これらKよって、省エネルギーでかり快適空調を形成す
ることのできる天井埋込型空気調和機を提供するもので
ある。These K provide a ceiling-embedded air conditioner that can provide energy-saving and comfortable air conditioning.
第1図は本発明の一実施例を示す構成図、第2図は本実
施例の要部拡大図、第3図は吹出し角度を切替えるため
のプログラムの一例を示すフローチャート図、第4図は
斜め下吹出し運転時の室内気流を示す断面図、第6図は
水平吹出し時の室内気流を示す断面図、第6図は従来の
空気調和機の底面図、第7図は上記空気調和機の中央断
面図、第8図は従来例における室内気流を示す断面図で
ある。
19・・・・・・運転時間積算手段、20a、20b・
・・・・吹出し角度切替手段。
代理人の氏名 弁理士 粟 野 重 孝 ほか1名第
図
嬉
図
第
図Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of this embodiment, Fig. 3 is a flowchart showing an example of a program for switching the blowout angle, and Fig. 4 is a flowchart showing an example of a program for switching the blowout angle. 6 is a sectional view showing the indoor airflow during diagonal downward blowing operation, Fig. 6 is a sectional view showing the indoor airflow during horizontal blowing operation, Fig. 6 is a bottom view of a conventional air conditioner, and Fig. 7 is a diagram of the above air conditioner. The center sectional view and FIG. 8 are sectional views showing indoor airflow in a conventional example. 19... Operating time accumulating means, 20a, 20b.
...Blowout angle switching means. Name of agent: Patent attorney Shigetaka Awano and one other person
Claims (1)
を制御する吹出し角度切替手段とを備え、前記運転時間
積算手段からの出力信号に基づき、運転時間の積算値が
あらかじめ設定された時間になれば、一定時間のみ吹出
し角度が天井と略水平になるように制御することを特徴
とする天井埋込型空気調和機。The apparatus includes an operating time accumulating means for accumulating operating time and an air blowing angle switching means for controlling a blowing angle, and when the integrated value of the operating time reaches a preset time based on an output signal from the operating time accumulating means. , a ceiling-mounted air conditioner characterized by controlling the air outlet angle so that it is approximately parallel to the ceiling for a certain period of time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63255172A JPH02103331A (en) | 1988-10-11 | 1988-10-11 | Ceiling embodies type air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63255172A JPH02103331A (en) | 1988-10-11 | 1988-10-11 | Ceiling embodies type air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02103331A true JPH02103331A (en) | 1990-04-16 |
Family
ID=17275046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63255172A Pending JPH02103331A (en) | 1988-10-11 | 1988-10-11 | Ceiling embodies type air conditioner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02103331A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5513953A (en) * | 1994-09-13 | 1996-05-07 | Hansen; Clint W. | Suspended ceiling fan |
JPH08320145A (en) * | 1995-05-25 | 1996-12-03 | Toshiba Corp | Air conditioner |
JP2014055733A (en) * | 2012-09-13 | 2014-03-27 | Daikin Ind Ltd | Air conditioner |
CN104748301A (en) * | 2015-03-06 | 2015-07-01 | 深圳达实智能股份有限公司 | Method and system for removing steady state errors of central air-conditioning temperature control system |
-
1988
- 1988-10-11 JP JP63255172A patent/JPH02103331A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5513953A (en) * | 1994-09-13 | 1996-05-07 | Hansen; Clint W. | Suspended ceiling fan |
JPH08320145A (en) * | 1995-05-25 | 1996-12-03 | Toshiba Corp | Air conditioner |
JP2014055733A (en) * | 2012-09-13 | 2014-03-27 | Daikin Ind Ltd | Air conditioner |
CN104748301A (en) * | 2015-03-06 | 2015-07-01 | 深圳达实智能股份有限公司 | Method and system for removing steady state errors of central air-conditioning temperature control system |
CN104748301B (en) * | 2015-03-06 | 2017-03-15 | 深圳达实智能股份有限公司 | A kind of method and system for eliminating central air-conditioning temperature control system steady-state error |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN108386907B (en) | Wall-hanging air conditioner and its automatically cleaning control method | |
CN107255307A (en) | Air-conditioning | |
CN107255337A (en) | The air supply method of air-conditioning | |
AU2004286118B2 (en) | Air conditioner and control method thereof | |
JP3073482B2 (en) | Operation control device and method for air conditioner | |
JPH02103331A (en) | Ceiling embodies type air conditioner | |
JP3526367B2 (en) | Air conditioner | |
JP2594318B2 (en) | Ceiling-mounted air conditioner | |
JPH05296548A (en) | Air conditioner | |
JPH01169256A (en) | Air-conditioner | |
JPH02166338A (en) | Air conditioner | |
JPH08178344A (en) | Air conditioner | |
JPH0234928U (en) | ||
JP2001201149A (en) | Air conditioner | |
JP2553644B2 (en) | Ceiling embedded air conditioner | |
JPH0221151A (en) | Ceiling-enbeded type air conditioner | |
JPH0552386A (en) | Method for controlling air flow direction of air conditioner | |
JPH11141918A (en) | Driving heat storage air conditioning system | |
JPH0331621A (en) | Air conditioner | |
JPS6233228A (en) | Indoor unit of air conditioning device | |
JPH07104028B2 (en) | Air conditioner control method | |
JPH01203838A (en) | Ceiling embedded type air conditioner | |
JPH01203837A (en) | Ceiling embedded type air conditioner | |
JPS629820B2 (en) | ||
JP2000009323A (en) | Hot air heater |