JPS5915764A - Light energy collecting apparatus having film structure - Google Patents

Light energy collecting apparatus having film structure

Info

Publication number
JPS5915764A
JPS5915764A JP57125496A JP12549682A JPS5915764A JP S5915764 A JPS5915764 A JP S5915764A JP 57125496 A JP57125496 A JP 57125496A JP 12549682 A JP12549682 A JP 12549682A JP S5915764 A JPS5915764 A JP S5915764A
Authority
JP
Japan
Prior art keywords
light energy
substance
compound
membrane
header
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.)
Granted
Application number
JP57125496A
Other languages
Japanese (ja)
Other versions
JPH033872B2 (en
Inventor
Kozo Kimura
興造 木村
Shoichi Suzuki
鈴木 昭一
Satoru Hirata
哲 平田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Takenaka Komuten Co Ltd
Original Assignee
Takenaka Komuten Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Takenaka Komuten Co Ltd filed Critical Takenaka Komuten Co Ltd
Priority to JP57125496A priority Critical patent/JPS5915764A/en
Publication of JPS5915764A publication Critical patent/JPS5915764A/en
Publication of JPH033872B2 publication Critical patent/JPH033872B2/ja
Granted legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/16Materials undergoing chemical reactions when used

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)

Abstract

PURPOSE:To enable to conserve energy for a long period, by causing a reaction of optical isomerization for converting to a light energy storing compound by the light energy transmitted through a film member. CONSTITUTION:Norbornadiene (referred hereinafter as substance N) is used as a light energy storing compound passed through the inside of a compound passage 26. The substance N is converted into a highly strained compound of quadricyclene (referred hereinafter as substance Q) by the reaction of optical isomerization when short wave rays in the range of ultraviolet rays are radiated. Solar rays radiated to a light energy collecting apparatus are radiated to the substance N in the compound passage 26 through a film member 10 and converts the substance N to the substance Q by causing the reaction of optical isomerization. Since the substance Q in a substance Q storing tank 36 is not converted again to the substance N by itself, it is enabled to accumulate energy over a long period.

Description

【発明の詳細な説明】 本発明は一対の膜体の間を通過する光エネルギ貯蔵化合
物に光エネルギを蓄積させて果状する膜構造光エネルギ
集成装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a membrane structure light energy assembly that stores light energy in a light energy storage compound that passes between a pair of membrane bodies.

太陽光等の光エネルギを果状する装置として対向する膜
体間に空気を導入し、この空気を熱媒体として太陽熱を
蓄積させる装置が提案されているこの果状装置は空気を
熱媒体としているため軽量で取扱いが容易となる利点を
有するが、空気の熱容量が小さいため太陽エネルギの果
状効率が低くかつ長期の保存が不可能である不具合を有
している。
A device has been proposed that uses light energy such as sunlight as a device that introduces air between opposing membrane bodies and uses this air as a heat medium to accumulate solar heat. This device uses air as a heat medium. Therefore, it has the advantage of being lightweight and easy to handle, but it has the disadvantage that the heat capacity of air is small, so the efficiency of solar energy is low, and it is impossible to store it for a long time.

また一対の膜体間へ水を流通させ、太陽光で加熱して果
状する装置も考えられるが、空気と同様にエネルギの長
期保存が不可能である。
Another possibility is a device that circulates water between a pair of membrane bodies and heats it with sunlight to form a fruit, but like air, it is impossible to store energy for a long time.

本発明は上記事実を考慮し、大規模な太陽熱集成が可能
で、長期間に渡ってエネルギ保存が可能な膜構造光エネ
ルギ集成装置を得ることが目的である。
In consideration of the above facts, the present invention aims to provide a membrane-structured optical energy assembly that is capable of large-scale solar thermal assembly and that can store energy for a long period of time.

本発明に係る膜構造光エネルギ果状装置社、対向して配
置する一対の膜体の両端をそれぞれ入口ヘッダ及び出口
ヘッダへ取り付け、入口ヘッダから光エネルギ貯蔵化合
物を両膜体間へ供給し、透明膜体を透過する太陽光等の
光エネルギで光エネルギ貯蔵化合物を高歪可能化合物か
ら高歪化合物へ変化させ、この高歪化合物を出口ヘッダ
から取り出すようになっている。
The membrane structure optical energy device according to the present invention attaches both ends of a pair of membrane bodies disposed opposite to an inlet header and an outlet header, respectively, and supplies a light energy storage compound from the inlet header between the two membrane bodies, The light energy storage compound is changed from a highly strainable compound to a high strain compound by light energy such as sunlight transmitted through the transparent membrane, and this high strain compound is taken out from the exit header.

以下本発明の実施例を図面に従い説明する。Embodiments of the present invention will be described below with reference to the drawings.

第1図ないし第3図に示される如く本実施例に係るエネ
ルギ収集装置は一対の対向して配置される透明膜体10
及び不透明膜体12の間を光エイ・ルギ貯蔵化合物が流
通するようになっている。
As shown in FIGS. 1 to 3, the energy collection device according to this embodiment includes a pair of transparent film bodies 10 disposed opposite to each other.
The optical energy storage compound is configured to flow between the opaque film body 12 and the opaque film body 12.

これらの透明膜体10及び不透明膜体12はその長手方
向(第1図左右方向)の両端部が入口ヘッダ14及び出
口へラダ16へ接続される。第4図に示される如くこの
接続構造は、ヘッダ14及び16から突出したー・対の
フランジ18.20へ透明膜体10及び不透明膜体12
の端部が接着等の手段により固着されて両膜体10.1
2が平行に配置されている。
Both ends of the transparent film body 10 and the opaque film body 12 in the longitudinal direction (left and right direction in FIG. 1) are connected to an entrance header 14 and an exit ladder 16. As shown in FIG. 4, this connection structure connects the transparent membrane 10 and the opaque membrane 12 to paired flanges 18.20 projecting from the headers 14 and 16.
The ends of both membranes 10.1 are fixed by adhesive or other means.
2 are arranged in parallel.

捷だ一対のへラダ14.16間には第3図に詳細に示さ
れる如くセパレータとしての役目を有するリブ22が複
数側柵は渡されている。このリブ22は幅寸法が膜体1
0.12間の寸法とされ幅方向端が膜体10.12へ接
着された薄肉板材であり、その長手方向がヘッダ14.
16の長手方向と直角に配置されて両端部がヘッダ14
,16へ固着されている。従ってこのリブ22は膜体1
0.12間を細長い複数個の小室に区画している。
As shown in detail in FIG. 3, a rib 22 serving as a separator is provided between the pair of spars 14 and 16 of the multi-sided fence. This rib 22 has a width dimension of the membrane body 1
It is a thin plate material with a dimension of between 0.12 and 10.12 mm, and its widthwise end is glued to the membrane body 10.12, and its longitudinal direction is the header 14.12.
The header 14 is arranged at right angles to the longitudinal direction of the header 16.
, 16. Therefore, this rib 22
The area is divided into several long and narrow chambers.

ことにこの実施例では、数個の小室が交互に化合物流通
路26及び空気充填室28とされている。
In particular, in this embodiment, several chambers are alternately designated as compound flow channels 26 and air-filled chambers 28.

空気充填室28へ充填された空気は光エネルギの収集に
は寄与しないが、充填空気の圧力で膜体10.12を張
設し空間30の屋根を構成させるようになっている。
Although the air filled into the air filling chamber 28 does not contribute to the collection of light energy, the pressure of the filled air stretches the membrane body 10.12 to form the roof of the space 30.

化合物流通路26に面したヘッダ14.16には第4図
に示される如くノズル32が複数個穿設されており、入
口へラダ14から化合物流通路26へ光エネルギ貯蔵化
合物を供給し、太陽光を収集したのちに出口ヘッダ16
から回収させるようになっている。との化合物流通路2
6内の化合物移動方向が第2.3図矢印A方向で示され
ている。
The header 14.16 facing the compound flow path 26 is provided with a plurality of nozzles 32, as shown in FIG. After collecting the light, exit header 16
It is designed to be collected from Compound flow path 2 with
The direction of movement of the compound within 6 is shown in the direction of arrow A in Figure 2.3.

化合物流通路26内を流通する光エネルギ貯蔵化合物と
して本実施例では第5図に示されるノルボルナジェン(
以下N体と称する)が用いられている。このN体は常温
で流動性を有する高企可能化合物であり、紫外線領域の
短波長光を照射すると光異性化反応により高歪化合物で
あるクワドリシクレン(以下Q体と称する)に変化する
性質を有しており、この9体は触媒(コバルトテトラフ
ェニルポリフィリン錯体やコバルトフタロシアニン錯体
)内を通過させると、触媒熱反応を生じてN体の状態に
戻る性質がある。この時に22kcat/Mot=24
0caL/V程度の熱発生を伴う。
In this embodiment, norbornagene (shown in FIG.
(hereinafter referred to as N-body) is used. This N-isomer is a highly stable compound that has fluidity at room temperature, and when irradiated with short wavelength light in the ultraviolet region, it changes into a highly strained compound quadricyclene (hereinafter referred to as Q-isomer) through a photoisomerization reaction. When these 9 forms are passed through a catalyst (cobalt tetraphenyl porphyrin complex or cobalt phthalocyanine complex), they undergo a catalytic thermal reaction and return to the N form. At this time 22kcat/Mot=24
Accompanied by heat generation of about 0 cal/V.

従って太陽光のうち主として短波長光を蓄積し、必要に
応じて熱エネルギとして放出可能である。
Therefore, it is possible to mainly accumulate short wavelength light of sunlight and release it as thermal energy as necessary.

第1図に示される如く出口ヘッダ16は配管34によっ
て9体貯留槽36へ連通されている。この9体貯留槽3
6は配管38及びポンプ40により貯湯槽42の発熱コ
イル44と連通されており、この発熱コイル44には9
体通路へ触媒46が面して設けられて触媒熱反応により
N体へ復帰させるようになっている。
As shown in FIG. 1, the outlet header 16 is connected to a nine-body reservoir 36 by piping 34. This 9 body storage tank 3
6 is connected to a heating coil 44 of a hot water storage tank 42 through a pipe 38 and a pump 40, and this heating coil 44 has a 9
A catalyst 46 is provided facing the body passageway to return the body to the N body through a catalytic thermal reaction.

発熱コイル44の出口には配管48が接続されており、
この配管48は8体貯留槽50へ接続されて触媒熱反応
により生じたN体を8体貯留槽50へ蓄積させるように
なっている。また8体貯留槽50は配管52及びポンプ
54で入口ヘッダ14と連通されてN体を必要時に入口
ヘッダ14へ循環させるように力っている。
A pipe 48 is connected to the outlet of the heating coil 44.
This pipe 48 is connected to an 8-body storage tank 50 so that the N-bodies produced by the catalytic thermal reaction are accumulated in the 8-body storage tank 50. The eight-body storage tank 50 is also connected to the inlet header 14 by piping 52 and a pump 54 to circulate the N-bodies to the inlet header 14 when necessary.

前記貯湯槽42には熱交コイル56が設けられており、
配管58,60及びポンプ62で空調器64へ接続され
ている。この空調器64は貯湯槽42からの熱を空間3
0へ送って暖房をしたり、−!、たこの熱を利用して例
えば吸収式冷凍機等により空間30を冷房することがで
きるようになっている。またとの貯湯槽42の加熱され
た温水を必要に応じて給湯部へ導いて消費することがで
きる。
The hot water storage tank 42 is provided with a heat exchanger coil 56,
It is connected to an air conditioner 64 by pipes 58, 60 and a pump 62. This air conditioner 64 transfers heat from the hot water tank 42 to the space 3.
0 for heating, -! The heat from the octopus can be used to cool the space 30 using, for example, an absorption refrigerator. Also, the heated hot water in the hot water storage tank 42 can be led to the hot water supply section and consumed as needed.

入口へラダ14には配管66を介して緊急貯留槽68が
連通されている。この配管66の中間部にはバルブ70
が介在されており、バルブ70を開放して光エネルギ貯
蔵化合物を緊急貯留槽68内へ貯蔵することができ、ま
たこの緊急貯留槽68へ配管72%バルブ74を介して
連通されるNt等の不活性ガスボンベ76の圧力で入口
ヘッダ14へ光エネルギ貯蔵化合物を補充することがで
きるようになっている。
An emergency storage tank 68 is connected to the inlet ladder 14 via a pipe 66. A valve 70 is located in the middle of this pipe 66.
is interposed, and the light energy storage compound can be stored in the emergency storage tank 68 by opening the valve 70, and the Nt etc. The pressure of the inert gas cylinder 76 allows the inlet header 14 to be refilled with optical energy storage compound.

なお本実施例の不透明膜体12はガラスクロスに四フッ
化エチレン樹脂を表面化粧した材料を用いることが好″
ましい。また空気充填室28の耐圧力が25に2/ct
I、耐荷重が5kg/イとなるように膜体10.12の
材料、寸法を設定しである。
The opaque film body 12 of this embodiment is preferably made of glass cloth coated with tetrafluoroethylene resin.
Delicious. In addition, the pressure resistance of the air filling chamber 28 is 25 to 2/ct.
I. The material and dimensions of the membrane body 10.12 were set so that the load capacity was 5 kg/I.

このように構成された本実施例の光エネルギ収 ゛集装
置Wでは、最初に不活性ガスボンベ76内の不活性ガス
を緊急貯留槽68へ導くことにより、緊急貯留槽68内
のN体を不活性ガスの圧力で入口へラダ14へと送り込
み膜体10,1.2間に充填させる。
In the optical energy collection device W of this embodiment configured in this way, first the inert gas in the inert gas cylinder 76 is guided to the emergency storage tank 68, thereby depleting the N bodies in the emergency storage tank 68. The active gas is fed under pressure to the inlet into the ladder 14 and filled between the membrane bodies 10 and 1.2.

光エネルギ収集装置へ照射する太陽光は膜体10を透過
して化合物流通路26内のN体へ照射し、光異性化反応
により高歪化合物であるQ体に変化させる。
The sunlight irradiated to the light energy collection device passes through the membrane 10 and irradiates the N-form in the compound flow path 26, and is converted into the Q-form, which is a highly strained compound, by a photoisomerization reaction.

このように膜体1.0,12間を進行するうちにN体は
次第にQ体に変化し、出口ヘッダ16から配管34を通
って9体貯留槽36へ蓄積される。
While proceeding between the membrane bodies 1.0 and 12 in this manner, the N bodies gradually change into Q bodies, which pass from the outlet header 16 through the pipe 34 and are accumulated in the nine body storage tank 36.

この9体貯留槽36内のQ体は単独ではN体に復帰する
ことはないので長期間に渡ってエネルギを蓄積すること
ができる。
Since the Q body in the 9 body storage tank 36 does not return to the N body by itself, energy can be stored over a long period of time.

必要に応じて9体貯留槽36内のQ体をポンプ40によ
り発熱コイル44へ導き触媒46と熱反応を生じさせN
体に復帰させる。この触媒熱反応によシ貯湯槽42内の
温水が加熱されるのでこれを暖房、冷房又は給湯に利用
することができる。
If necessary, the Q body in the 9 body storage tank 36 is guided to the heating coil 44 by the pump 40 to cause a thermal reaction with the catalyst 46.
return to the body. This catalytic thermal reaction heats the hot water in the hot water storage tank 42, which can be used for heating, cooling, or hot water supply.

復帰したN体は配管48を通って8体貯留槽5゜へ蓄積
され、ポンプ54の圧力で配管52を通って入口へラダ
14へと送られる。
The returned N bodies pass through the pipe 48 and are accumulated in the eight body storage tank 5°, and are sent to the ladder 14 through the pipe 52 to the inlet under the pressure of the pump 54.

また落雷等の危険性がある場合は、バルブ70を開放し
て入口へラダ14からN体を緊急貯留槽68内へ退避さ
せることができるので引火性の光エネルギ貯蔵化合物を
も使用可能である。
In addition, if there is a danger such as a lightning strike, the valve 70 can be opened to evacuate the N bodies from the rudder 14 to the inlet into the emergency storage tank 68, making it possible to use flammable light energy storage compounds. .

上記の熱エネルギは冷暖房、給湯以外にも発熱、融雪、
温水プール、農業等に広く適用可能であるため応用範囲
が著しく広い。捷だ膜構造は広い範囲に渡って張設可能
であるだめ、道路、商店街アーケード、公園等を全体的
に囲繞可能であり、屋根材として用いる場合にはエネル
ギ収集装置と屋根材とが兼用できコスト低減に寄与でき
、更に屋根からの熱損失を減少することができる。なお
上記実施例の不透明膜体I2に代えて半透明材料を使用
すれば天井部からの採光が可能となる。
The above thermal energy is used not only for air conditioning and hot water supply, but also for heat generation, snow melting,
The range of applications is extremely wide as it can be widely applied to hot water pools, agriculture, etc. Since the membrane structure can be stretched over a wide area, it can completely surround roads, shopping arcades, parks, etc., and when used as a roofing material, it can be used as both an energy collection device and a roofing material. This can contribute to cost reduction and further reduce heat loss from the roof. Note that if a translucent material is used in place of the opaque film body I2 of the above embodiment, light can be brought in from the ceiling.

壕だ上記実施例の空気充填室28へ吸放熱材である水を
循環させて太陽エネルギを収集させれば、水は太陽光の
うち主として長波長光を集熱可能であるだめ光エネルギ
貯蔵化合物と合わせて全波長域の太陽エネルギが集熱可
能となる。上記実施例では光エネルギ貯蔵化合物として
ノルボルナジェンを使用したが、本発明は可逆的光異性
化反応によって光エネルギの吸収と熱エネルギの放出を
反復し得る流動性の光エネルギ貯蔵化合物であれば全て
適用可能であり、アゼピン等の他の化合物も使用できる
。このアゼピンは短波長光を受けて高歪化合物であるジ
クロブテノジヒドロビロールに変化し、触媒の存在下で
再び高歪可能化合物でおるアゼピンに復帰すると共に熱
発生を伴うようになっている。
If solar energy is collected by circulating water, which is a heat absorbing and dissipating material, into the air-filled chamber 28 of the above embodiment, the water can collect mainly long-wavelength light from the sunlight. Together with this, solar energy in the entire wavelength range can be collected. Although norbornadiene was used as the light energy storage compound in the above example, the present invention can be applied to any fluid light energy storage compound that can repeatedly absorb light energy and release thermal energy through a reversible photoisomerization reaction. Yes, other compounds such as azepines can also be used. When this azepine receives short-wavelength light, it changes to dichlorobutenodihydrobyrol, a highly strained compound, and in the presence of a catalyst, it reverts back to azepine, a highly strainable compound, and is accompanied by heat generation. .

以上説明した如く本発明に係る膜構造光エネルギ収集装
置は一対の膜体間へ光エネルギ貯蔵化合物を供給する構
造であるため簡単な構造で大規模ガ太陽熱収集が可能と
な9.かつ太陽熱の長期間保存ができる優れた効果を有
する。
As explained above, the film-structured light energy collecting device according to the present invention has a structure in which a light energy storage compound is supplied between a pair of film bodies, so that large-scale solar heat collection is possible with a simple structure.9. It also has the excellent effect of preserving solar heat for a long period of time.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る膜構造光エネルギ収集装置の実施
例を示す系統図、第2図はエネルギ収集装置を示す平面
図、第3図は第2図の分解斜視図、第4図はヘッダと膜
体との取付部を示す断面図、第5図は本実施例に用いる
光エネルギ貯蔵化合物を示す化学反応式である。 10・・・透明膜体、  12・・・不透明膜体、14
・・・入口ヘッダ、  16・・・出口ヘッダ、26・
・・化合物流通路、32・・・ノズル。 代理人 弁理士  中 島  淳 第3図 第4図 z 第5図 (λイ1ζ
FIG. 1 is a system diagram showing an embodiment of the film structure optical energy collecting device according to the present invention, FIG. 2 is a plan view showing the energy collecting device, FIG. 3 is an exploded perspective view of FIG. 2, and FIG. FIG. 5 is a sectional view showing the attachment portion between the header and the film body, and FIG. 5 is a chemical reaction formula showing the optical energy storage compound used in this example. 10... Transparent film body, 12... Opaque film body, 14
...Inlet header, 16...Outlet header, 26.
... Compound flow path, 32... Nozzle. Agent Patent Attorney Atsushi Nakajima Figure 3 Figure 4 z Figure 5 (λi 1ζ

Claims (1)

【特許請求の範囲】[Claims] (1)対向して配置する一対の膜体の両端をそれぞれ入
口ヘッダ及び出口ヘッダへ取シつけ、入口ヘッダから光
エネルギ貯蔵化合物を両膜体間へ供給し、前記膜体を透
過する光エネルギで光エネルギ貯蔵化合物へ光異性化反
応を生じさせ、この光エネルギ貯蔵化合物を出口ヘッダ
から取出すことを特徴とした膜構造光エネルギ集成装置
(1) Both ends of a pair of membrane bodies disposed opposite to each other are attached to an inlet header and an outlet header, and a light energy storage compound is supplied from the inlet header between the two membrane bodies, and the light energy transmitted through the membrane bodies is 1. A membrane-structured light energy assembly, characterized in that a photoisomerization reaction occurs in a light energy storage compound at a temperature of 100.degree. C., and the light energy storage compound is extracted from an exit header.
JP57125496A 1982-07-19 1982-07-19 Light energy collecting apparatus having film structure Granted JPS5915764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57125496A JPS5915764A (en) 1982-07-19 1982-07-19 Light energy collecting apparatus having film structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57125496A JPS5915764A (en) 1982-07-19 1982-07-19 Light energy collecting apparatus having film structure

Publications (2)

Publication Number Publication Date
JPS5915764A true JPS5915764A (en) 1984-01-26
JPH033872B2 JPH033872B2 (en) 1991-01-21

Family

ID=14911538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57125496A Granted JPS5915764A (en) 1982-07-19 1982-07-19 Light energy collecting apparatus having film structure

Country Status (1)

Country Link
JP (1) JPS5915764A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS621807U (en) * 1985-06-17 1987-01-08
US4869131A (en) * 1987-03-09 1989-09-26 Olympic Co., Ltd. Variable speed gearing in rotary electric tool
US4898249A (en) * 1987-08-05 1990-02-06 Olympic Co., Ltd. Rotary electric tool

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5365265A (en) * 1976-11-25 1978-06-10 Battelle Development Corp Capture and collection of sun energy by utilizing reversible photochemical isomerization

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5365265A (en) * 1976-11-25 1978-06-10 Battelle Development Corp Capture and collection of sun energy by utilizing reversible photochemical isomerization

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS621807U (en) * 1985-06-17 1987-01-08
US4869131A (en) * 1987-03-09 1989-09-26 Olympic Co., Ltd. Variable speed gearing in rotary electric tool
US4898249A (en) * 1987-08-05 1990-02-06 Olympic Co., Ltd. Rotary electric tool

Also Published As

Publication number Publication date
JPH033872B2 (en) 1991-01-21

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