JPH0830633B2 - Heat transfer tube for absorber - Google Patents
Heat transfer tube for absorberInfo
- Publication number
- JPH0830633B2 JPH0830633B2 JP2031783A JP3178390A JPH0830633B2 JP H0830633 B2 JPH0830633 B2 JP H0830633B2 JP 2031783 A JP2031783 A JP 2031783A JP 3178390 A JP3178390 A JP 3178390A JP H0830633 B2 JPH0830633 B2 JP H0830633B2
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- transfer tube
- absorber
- curvature
- radius
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は吸収冷凍機用の吸収器用伝熱管に関するもの
である。TECHNICAL FIELD The present invention relates to an absorber heat transfer tube for an absorption refrigerator.
〈従来の技術〉 この種の吸収器用伝熱管としては、突条の山部と谷部
の曲率半径が等しい。又は、谷部の曲率半径が小さい場
合には、谷部の吸収液膜が厚くなるが、山部へ向かって
広がらず、且つ隣の谷部への吸収液の移動が困難となっ
ていた（例えば、特開昭58-20095号）。<Prior Art> In this type of absorber heat transfer tube, the ridges and the valleys of the protrusions have the same radius of curvature. Alternatively, when the radius of curvature of the valley is small, the absorption liquid film in the valley becomes thicker, but it does not spread toward the peak and it is difficult to move the absorption liquid to the adjacent valley ( For example, JP-A-58-20095).
他の従来例（例えば実願昭63-11800号）は第５図，第
６図に示すように、突条２をもつ伝熱管１の山部３の曲
率半径R1,谷部４の曲率半径R2とした場合において、R2
＞R1では谷部４の曲率半径が大きい分、吸収液が薄く広
がり易く、且つ隣の谷部４への吸収液の移動がスムーズ
に行なわれ伝熱管全周へ均一に流れる。Another conventional example (for example, Japanese Utility Model Application No. 63-11800) is, as shown in FIGS. 5 and 6, a radius of curvature R 1 of a mountain portion 3 and a curvature of a valley portion 4 of a heat transfer tube 1 having a ridge 2. R 2 for radius R 2
When> R 1 , the radius of curvature of the valley portion 4 is large, so that the absorbing liquid is thin and easily spread, and the absorbing liquid is smoothly moved to the adjacent valley portion 4 and flows uniformly over the entire circumference of the heat transfer tube.
〈発明が解決しようとする課題〉 しかしながら、この構造では管群全体からみると、伝
熱管長が長くなったり管群の段数が多くなると、吸収液
の滴下状況が悪くなり均一に濡れず、偏流してくる問題
があった。<Problems to be Solved by the Invention> However, in this structure, when the length of the heat transfer tube is increased or the number of stages of the tube group is increased from the viewpoint of the entire tube group, the dripping state of the absorbing liquid is deteriorated and the liquid does not uniformly get wet, resulting in uneven There was a problem flowing.
本発明は上記実情に鑑み、吸収器管群での吸収液の濡
れ性を向上させ、管群全体の熱交換量を増加させるよう
にした吸収器用伝熱管を提供することを目的としたもの
である。In view of the above situation, the present invention aims to provide a heat transfer tube for an absorber, which improves the wettability of the absorbing liquid in the absorber tube group and increases the heat exchange amount of the entire tube group. is there.
〈課題を解決するための手段〉 本発明は、管外表面に吸収液が滴下又は散布され管内
の冷却水によって管外の吸収液を冷却し、蒸発器からの
冷媒蒸気を冷却する吸収器用伝熱管において、管外面に
は管軸に対して15°以下の捩じれ角を為すような複数の
突条を、それらの突条の山部と突条の間の谷部とが連続
した弯曲面形状を与えるように形成すると共に、それら
の山部の曲率半径（R1）と谷部の曲率半径（R2）とを、
それらの比率（R2/R1）が１よりは大きくなるように設
定したものである。<Means for Solving the Problems> The present invention is an absorber transmission for cooling the absorption liquid outside the pipe by cooling or cooling the absorption liquid inside the pipe by absorbing or dripping the absorption liquid on the outside surface of the pipe. In a heat tube, the outer surface of the tube has a plurality of ridges with a twist angle of 15 ° or less with respect to the tube axis, and a curved surface shape in which the peaks of these ridges and the valleys between the ridges are continuous. And the radius of curvature of the peaks (R 1 ) and the radius of curvature of the valleys (R 2 ) of
The ratios (R 2 / R 1 ) are set to be larger than 1.
〈作用〉 上記のような構成のため、上方のトレイより滴下する
界面活性剤を含む臭化リチウム，水溶液等の吸収液は、
伝熱管に当たって各突条の山部を越えて外表面をスムー
ズに流れ、各山部と谷部で生ずるマランゴニー対流が干
渉し合い管軸方向に大きな撹乱作用が生じ、且つ全周に
わたり均一なマランゴニー対流となり、しかも、管自体
は捩じれているため各段の伝熱面全長にわたって吸収液
が濡れるものとなる。<Operation> Due to the above-mentioned configuration, the absorbing liquid such as lithium bromide or aqueous solution containing the surfactant dropped from the upper tray is
When the heat transfer tube hits the ridges of each ridge and smoothly flows over the outer surface, the Marangoni convection generated at the ridges and valleys interferes with each other to cause a large disturbance action in the axial direction of the pipe, and the Marangoni uniform over the entire circumference. Due to convection, and because the tube itself is twisted, the absorbing liquid becomes wet over the entire length of the heat transfer surface of each stage.
〈実施例〉 以下、本発明の実施例を図面に基づいて説明すれば、
次の通りである。<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.
It is as follows.
第１図は吸収冷凍機構の吸収器部の説明図を示し、１
は本発明の吸収器に平行に設置された例えばφ16の伝熱
管であり、この最上位置の伝熱管１の上方に吸収液散布
用トレイ５を設置する。このトレイ５には多数のトレイ
用孔5aを穿ってなる。この場合、伝熱管１の外表面は、
第２図，第３図に示すように長手方向、即ち管軸方向に
15°以下の捩じれ角α°（図示にあって約５°）を有
し、且つ、管軸方向に複数の突条２を形成されている。
しかも、この各突条２の山部３及び隣り合った突条2,2
の間の谷部４は、それぞれ曲面形状をしている。そし
て、山部３の曲率半径R1が例えば1.0mm、谷部４の曲率
半径R2が例えば1.5mmであり、山部３より谷部４の曲率
半径を大きくなるように伝熱管１は形成されている。ま
た、各突条２の高さＨが1.0mm以下の例えば0.7mmにな
り、且つ、各突条２の間隔が例えば略4mmになるように
伝熱管１を形成する。そして、捩じれ角は例えば５°で
ある。FIG. 1 is an explanatory view of the absorber section of the absorption refrigeration mechanism.
Is a heat transfer tube of, for example, φ16 installed in parallel with the absorber of the present invention, and the absorbing liquid spraying tray 5 is installed above the heat transfer tube 1 at the uppermost position. The tray 5 is formed with a large number of tray holes 5a. In this case, the outer surface of the heat transfer tube 1 is
As shown in FIGS. 2 and 3, in the longitudinal direction, that is, in the pipe axis direction.
It has a twist angle α of 15 ° or less (about 5 ° in the figure) and a plurality of ridges 2 are formed in the tube axis direction.
Moreover, the ridge portion 3 of each ridge 2 and the adjacent ridges 2, 2
The troughs 4 between them have curved shapes. The radius of curvature R 1 of the crest 3 is, for example, 1.0 mm, the radius of curvature R 2 of the trough 4 is, for example, 1.5 mm, and the heat transfer tube 1 is formed so that the radius of curvature of the trough 4 is larger than that of the crest 3. Has been done. Further, the heat transfer tube 1 is formed such that the height H of each ridge 2 is 1.0 mm or less, for example, 0.7 mm, and the interval between each ridge 2 is, for example, about 4 mm. The twist angle is, for example, 5 °.
次にこの作用を説明すると、先ず上記伝熱管１におい
て、トレイ５の滴下孔5aから界面活性剤を含んだ臭化リ
チュウム（RiBr），水溶液等の吸収液を伝熱管１へ滴下
した場合には、吸収液が各突条２の山部３を越えて伝熱
管１の外表面をスムーズに流れ、各谷部４でマランゴニ
ー対流、即ち界面活性剤の液膜表面の濃度分布により、
表面張力差が生じ、これに起因して張力対流が発生す
る。Next, this operation will be explained. First, in the heat transfer tube 1, when an absorbing liquid such as lithium bromide (RiBr) containing a surfactant or an aqueous solution is dropped into the heat transfer tube 1 from the dropping hole 5a of the tray 5. , The absorbing liquid smoothly flows over the outer surface of the heat transfer tube 1 over the ridges 3 of each ridge 2, and the Marangoni convection at each valley 4, that is, the concentration distribution on the surface of the liquid film of the surfactant,
A difference in surface tension occurs, which causes tension convection.
即ち、第２図に示したように各谷部４では液膜ａの厚
さΔＨが厚くなり、管軸方向のマランゴニー対流が強く
なる。また、各山部３では液膜の厚さΔｈが薄くなり、
管軸方向のマランゴニー対流が弱くなる。そして、山部
３と谷部４のマランゴニー対流が干渉し合い、管軸方向
に大きな撹乱作用が発生する。That is, as shown in FIG. 2, the thickness ΔH of the liquid film a becomes thicker in each valley 4 and the Marangoni convection in the tube axis direction becomes stronger. In addition, the thickness Δh of the liquid film becomes thin in each mountain portion 3,
Marangoni convection in the tube axis direction weakens. Then, the Marangoni convections of the mountain portion 3 and the valley portion 4 interfere with each other, and a large disturbing action occurs in the pipe axis direction.
更に、谷部４の曲率半径が山部３の曲率半径より大き
く、谷部４がなだらかな曲面形状であり、谷部４での吸
収液の入れ換わりが速くなり、伝熱管１の外表面での吸
収液の移動が速くなる。そして、伝熱管１の全周にわた
り略均一にマランゴニー対流が発生する。しかも、捩じ
れ角があるため、吸収液が捩じれ角に合って流下するた
め、各段の伝熱面全長にわたって吸収液が濡れ偏流する
ことがない。そのため、管群全体にわたり均一なマラン
ゴニー対流が発生する。Furthermore, the radius of curvature of the valley portion 4 is larger than that of the mountain portion 3, and the valley portion 4 has a gently curved surface shape, the exchange of the absorbing liquid in the valley portion 4 becomes faster, and the outer surface of the heat transfer tube 1 is The absorption liquid moves faster. Then, Marangoni convection is generated substantially uniformly over the entire circumference of the heat transfer tube 1. Moreover, since there is a twist angle, the absorbing liquid flows down according to the twist angle, so that the absorbing liquid does not wet and drift unevenly over the entire length of the heat transfer surface of each stage. Therefore, uniform Marangoni convection occurs over the entire tube group.
上記実施例によれば、伝熱管１に吸収液を滴下したと
き、管外面の吸収液が山部３より曲率半径が大きい谷部
４から曲面に形成された山部３を越えて次の谷部４へと
スムーズに流れ、谷部４での吸収液の入れ換えが捩じり
角があるため更にスムーズに行われると共に、吸収液を
伝熱管１の全周にわたり均一に流すことができ、且つ、
山部３及び谷部４に発生したマランゴニー対流が互いに
干渉し合い、管軸方向に大きな撹乱作用が発生し、伝熱
管１での熱交換効率を大幅に向上させることができる。
また、管内面を管外面に対応して曲面に形成することに
より、管内面への冷却水中のスケール付着を防止できる
と共に、管内の清掃を容易に行うことができる。According to the above-mentioned embodiment, when the absorbing liquid is dropped onto the heat transfer tube 1, the absorbing liquid on the outer surface of the pipe passes from the valley portion 4 having a larger radius of curvature than the peak portion 3 to the next valley over the curved peak portion 3. It smoothly flows to the portion 4, and the replacement of the absorbing liquid in the valley 4 is performed more smoothly due to the twist angle, and the absorbing liquid can be made to flow uniformly over the entire circumference of the heat transfer tube 1, and ,
The Marangoni convections generated in the ridges 3 and the valleys 4 interfere with each other to generate a large disturbing action in the tube axis direction, and the heat exchange efficiency in the heat transfer tube 1 can be significantly improved.
Further, by forming the inner surface of the pipe into a curved surface corresponding to the outer surface of the pipe, it is possible to prevent the scale from adhering to the inner surface of the cooling water in the cooling water and to easily clean the inside of the pipe.
更に、突条２の高さを1.0mmより大きくした場合に
は、伝熱管１の管外に滴下した吸収液が谷部４に滞留し
易くなり、吸収液の入れ換えがスムーズに行われなくな
るため、突条２の高さを1.0mm以下にするのが望まし
い。Furthermore, when the height of the ridges 2 is set to be larger than 1.0 mm, the absorbing liquid dropped outside the heat transfer tube 1 is likely to stay in the troughs 4 and the absorbing liquid cannot be replaced smoothly. It is desirable that the height of the ridge 2 be 1.0 mm or less.
尚、上記伝熱管１よりも管外面の突条２の数を減らし
た場合にも、谷部４の曲率半径を山部３より大きくする
ことにより同様の作用効果を得ることができる。Even when the number of the projections 2 on the outer surface of the heat transfer tube 1 is smaller than that of the heat transfer tube 1, the same operational effect can be obtained by making the radius of curvature of the valley 4 larger than that of the peak 3.
〈発明の効果〉 上述のように本発明の吸収器用伝熱管は、複数個の捩
じった突条を配設し、且つ谷部の曲率半径（R2）と山部
の曲率半径（R1）とを、それらの比率（R2/R1）が１よ
り大きくなるように設定したことにより、液膜の厚い
谷部と液膜の薄い山部で発生したマランゴニー対流が互
いに干渉し合い、管軸方向に強力な撹乱作用を発生し合
う。谷部の曲率半径が大きいため、次の谷部への吸収
液の移動がスムーズに行える。管外面に管軸に対して
15°以下の捩じれがあるため、吸収液が管軸方向に流れ
ながら、しかも次の伝熱管に重力の影響で流下するた
め、管軸方向に捩じれがない場合に比べ、管群全体での
濡れ性が向上する。そのため、これらが相俟って
伝熱性能が５％程度上昇するものとなる。このときの伝
熱性能を変化を示せば、第４図のようになる。例えばLi
Br溶液流量0.66kg/msを散布した場合の熱交換量は、従
来型は43KW出力したが、本発明では45kW出力した。故に
５％の上昇か確認できた。<Advantages of the Invention> As described above, the absorber heat transfer tube of the present invention is provided with a plurality of twisted ridges, and the radius of curvature of the valley (R 2 ) and the radius of curvature of the mountain (R 2 ). By setting 1 ) and so that their ratio (R 2 / R 1 ) is greater than 1, the Marangoni convections generated in the thick valley of the liquid film and the thin peak of the liquid film interfere with each other. , Generate strong disturbing action in the axial direction of the tube. Since the radius of curvature of the valley is large, the absorption liquid can be smoothly moved to the next valley. On the outer surface of the pipe with respect to the pipe axis
Since there is a twist of 15 ° or less, the absorbing liquid flows in the tube axis direction and flows down to the next heat transfer tube due to the effect of gravity, so that the entire tube group becomes wet compared to the case where there is no twist in the tube axis direction. The property is improved. Therefore, the heat transfer performance increases about 5% together. The change in heat transfer performance at this time is shown in FIG. For example Li
The amount of heat exchange when the Br solution flow rate was 0.66 kg / ms was 43 KW output in the conventional type, but 45 kW output in the present invention. Therefore, it was confirmed that the increase was 5%.
【図面の簡単な説明】 第１図は本発明の実施例を示す吸収器に水平使用した説
明図、第２図は伝熱管の要部縦断正面図、第３図は同伝
熱管の捩じれ角を示す説明図、第４図は熱交換量を示す
図、第５図は従来品の伝熱管の断面図、第６図は同側面
図である。 １……伝熱管、２……突条、３……山部、４……谷部。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view in which an absorber according to an embodiment of the present invention is used horizontally, FIG. 2 is a vertical sectional front view of a main part of a heat transfer tube, and FIG. 3 is a twist angle of the heat transfer tube. FIG. 4 is a diagram showing the amount of heat exchange, FIG. 5 is a sectional view of a conventional heat transfer tube, and FIG. 6 is a side view of the same. 1 ... Heat transfer tube, 2 ... Ridge, 3 ... Mountain section, 4 ... Valley section.
フロントページの続き (72)発明者 西本 嘉弘 愛知県宝飯郡一宮町大木新道100番地 住 友軽金属工業株式会社伸銅所内 (72)発明者 古川 雅裕 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内 (72)発明者 金子 敏之 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内 (56)参考文献 特開 平２−71062（ＪＰ，Ａ) 特開 平２−176378（ＪＰ，Ａ) 実開 平２−89270（ＪＰ，Ｕ)Front page continued (72) Inventor Yoshihiro Nishimoto 100 Oki Shindo, Ichinomiya-cho, Takai-gun, Aichi Sumitomo Light Metal Industries, Ltd. (Shindo Copper Works) (72) Inventor Masahiro Furukawa 2-18, Keihan Hondori, Moriguchi City, Osaka Electric Machinery Co., Ltd. (72) Inventor Toshiyuki Kaneko 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-2-71062 (JP, A) JP-A-2-176378 ( JP, A) Actual Kaihei 2-89270 (JP, U)
Claims (1)
の冷却水によって管外の吸収液を冷却し、蒸発器からの
冷媒蒸気を冷却する吸収器用伝熱管において、管外面に
は管軸に対して15°以下の捩じれ角を為すような複数の
突条を、それらの突条の山部と突条の間の谷部とが連続
した弯曲面形状を与えるように形成すると共に、それら
の山部の曲率半径（R1）と谷部の曲率半径（R2）とを、
それらの比率（R2/R1）が１よりは大きくなるように設
定したことを特徴とする吸収器用伝熱管。1. A heat transfer tube for an absorber in which an absorbing liquid is dropped or sprinkled on the outer surface of the pipe to cool the absorbing liquid outside the pipe by cooling water inside the pipe to cool refrigerant vapor from an evaporator. A plurality of ridges that form a twist angle of 15 ° or less with respect to the axis are formed such that the peaks of these ridges and the valleys between the ridges give a continuous curved surface shape, The radius of curvature of the peaks (R 1 ) and the radius of curvature of the valleys (R 2 ) are
A heat transfer tube for an absorber, characterized in that the ratio (R 2 / R 1 ) thereof is set to be larger than 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2031783A JPH0830633B2 (en) | 1990-02-13 | 1990-02-13 | Heat transfer tube for absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2031783A JPH0830633B2 (en) | 1990-02-13 | 1990-02-13 | Heat transfer tube for absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03236561A JPH03236561A (en) | 1991-10-22 |
| JPH0830633B2 true JPH0830633B2 (en) | 1996-03-27 |
Family
ID=12340656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2031783A Expired - Lifetime JPH0830633B2 (en) | 1990-02-13 | 1990-02-13 | Heat transfer tube for absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830633B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644051Y2 (en) * | 1980-07-31 | 1989-02-02 | ||
| JPH0271062A (en) * | 1988-09-05 | 1990-03-09 | Sumitomo Light Metal Ind Ltd | Heat transfer tube for absorber |
-
1990
- 1990-02-13 JP JP2031783A patent/JPH0830633B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03236561A (en) | 1991-10-22 |
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