JPH0345868A - Heat recovery system utilizing latent heat recovery device - Google Patents
Heat recovery system utilizing latent heat recovery deviceInfo
- Publication number
- JPH0345868A JPH0345868A JP1177219A JP17721989A JPH0345868A JP H0345868 A JPH0345868 A JP H0345868A JP 1177219 A JP1177219 A JP 1177219A JP 17721989 A JP17721989 A JP 17721989A JP H0345868 A JPH0345868 A JP H0345868A
- Authority
- JP
- Japan
- Prior art keywords
- hot water
- cooling
- heating
- route
- water
- 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
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 140
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000000498 cooling water Substances 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000008400 supply water Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、エンジンの排気ガスを潜熱回収器に導き、こ
の潜熱回収器により熱回収を行う熱回収システムにおい
て、給湯のほか、冷・暖房等の他の用途に対しても回収
した熱量を有効に利用できるようにした熱回収システム
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a heat recovery system that guides engine exhaust gas to a latent heat recovery device and recovers heat using the latent heat recovery device. The present invention relates to a heat recovery system that allows the recovered heat to be used effectively for other uses such as the following.
［従来の技術］
給湯のほか、冷暖房等の他の回収熱量の用途を有する従
来の熱回収システムとしては、第２図に示すように、冷
却水の循環路１ａと分岐循環路１ｂおよび排気管ＩＣと
を備えたエンジン（たとえば、ガスエンジン）１．交流
発電機２．冷却水熱交換器３．排気ガス熱交換器４を備
え、これら各熱交換器３，４を結ぶ熱回収ライン５中に
冷・暖房用の熱交換器６および給湯用の温水熱交換器７
を設けていた。[Prior Art] In addition to hot water supply, a conventional heat recovery system that has other uses for the recovered heat such as air conditioning and heating includes a cooling water circulation path 1a, a branch circulation path 1b, and an exhaust pipe, as shown in FIG. An engine (for example, a gas engine) equipped with an IC 1. AC generator 2. Cooling water heat exchanger 3. An exhaust gas heat exchanger 4 is provided, and a heat exchanger 6 for cooling/heating and a hot water heat exchanger 7 for hot water supply are provided in a heat recovery line 5 connecting each of these heat exchangers 3 and 4.
was established.
なお、８は排気ガスの排気管である。Note that 8 is an exhaust pipe for exhaust gas.
以上の構成で、エンジン１の駆動により交流発電機２に
よって電力を発生すると共に、エンジン（の高熱部を冷
却した後の温水を利用して冷却水熱交換器３中で水道水
を温水にし、これを更に排気ガス熱交換器４に供給して
排気管１ｃから供給された排気ガスにて加熱し、この結
果得られた温水を各熱交換器６．７を介して冷・暖房お
よび給湯用として使用するようにしていた。With the above configuration, electric power is generated by the alternator 2 when the engine 1 is driven, and tap water is heated in the cooling water heat exchanger 3 using hot water after cooling the high-temperature parts of the engine. This is further supplied to the exhaust gas heat exchanger 4 and heated by the exhaust gas supplied from the exhaust pipe 1c, and the resulting hot water is used for cooling/heating and hot water supply via each heat exchanger 6.7. I was trying to use it as.
［発明が解決しようとする課題］
ところで、従来のものは１間接式である排気ガス熱交換
器４によって排気ガスの熱回収をしている方式であった
ため、熱効率が８０％位と低いという欠点があった。[Problems to be Solved by the Invention] By the way, the conventional system recovers heat from the exhaust gas using the exhaust gas heat exchanger 4, which is a one-indirect type, and therefore has the disadvantage of a low thermal efficiency of about 80%. was there.
また、従来のものは同一の熱回収ライン５中に給湯、冷
・暖房という多用途の熱回収用途を組み込んでいたため
、総合効率が各用途の需要等で大巾に変化し、結果とし
て総合効率が悪くなるという欠点もあった。In addition, because the conventional system incorporates multiple heat recovery applications such as hot water supply, cooling, and heating into the same heat recovery line 5, the overall efficiency varies greatly depending on the demand for each application, and as a result, the overall efficiency It also had the disadvantage of being inefficient.
本発明は、従来のこれらの課題（問題点）を解決するよ
うにした潜熱回収器を利用した熱回収システムを提供す
ることを目的とする。An object of the present invention is to provide a heat recovery system using a latent heat recovery device that solves these conventional problems.
［課題を解決するための手段１
本発明はエンジンの排気ガスを潜熱回収器に導き、この
潜熱回収器に対して循環的に供給される水を潜熱回収方
式により温水へと加熱し、この温水を熱源として温水熱
交換器において供給水をクリーンな温水に加熱して給湯
するようにした給湯ルートと、エンジンのジャケット部
から熱回収した温水を熱源として加熱される冷却水熱交
換器。[Means for Solving the Problems 1] The present invention guides engine exhaust gas to a latent heat recovery device, heats water cyclically supplied to the latent heat recovery device into hot water by a latent heat recovery method, and converts the hot water into hot water. A hot water supply route uses hot water as a heat source to heat the supply water to clean hot water in a hot water heat exchanger, and a cooling water heat exchanger uses hot water recovered from the engine jacket as a heat source.
この冷却水熱交換器の温水が供給される温水槽を介して
暖房用の温水または冷房用の冷水を得るようにした冷・
暖房用ルートとを備えるようにした潜熱回収器を利用し
た熱回収システムに関するものである。This cooling water heat exchanger is designed to obtain hot water for heating or cold water for cooling through a hot water tank to which hot water is supplied.
The present invention relates to a heat recovery system using a latent heat recovery device equipped with a heating route.
この場合、給湯ルートには貯湯槽を備えて貯湯槽から給
湯するようにし、冷・暖房用ルートは。In this case, the hot water supply route is equipped with a hot water storage tank, and hot water is supplied from the hot water storage tank, and the cooling/heating route is equipped with a hot water storage tank.
暖房用熱交換器より成る暖房ルートと複合吸収式冷温水
器とクーリングタワーより戊る冷房ルートとを備え、暖
房時と冷房時の各場合に温水槽からの温水を暖房ルート
と冷房ルートとに切り換えて。Equipped with a heating route consisting of a heating heat exchanger and a cooling route from a combined absorption type water cooler/heater and a cooling tower, hot water from the hot water tank is switched between the heating route and the cooling route during heating and cooling respectively. hand.
暖房用の温水、冷房用の冷水を得るようにした潜熱回収
器を利用した熱回収システムとすることができる。A heat recovery system using a latent heat recovery device that obtains hot water for heating and cold water for cooling can be provided.
［実施例］
以下第１図に示す一実施例により本発明を具体的に説明
する。[Example] The present invention will be specifically described below with reference to an example shown in FIG.
同図において、従来のものと同等の構成について第２図
のものと同一の符号を付して示した。In the same figure, the same reference numerals as those in FIG. 2 are used to indicate structures equivalent to the conventional one.
２は潜熱回収器で、上方に先端部がシャワー状の蛇口１
０ａを有する供給管１０．排気管８を備え、蛇口１０ａ
の直下方に当たる略中間部に充填層１１を、また、底部
に貯湯部１２と排気ガス供給管１３（この供給管１３は
排気管１ｃに連結されている）を備えて構成されている
。2 is a latent heat recovery device, and above there is a faucet 1 with a shower-shaped tip.
Supply pipe 10 with 0a. Equipped with an exhaust pipe 8, a faucet 10a
A packed bed 11 is provided at a substantially middle portion directly below the fuel tank, and a hot water storage portion 12 and an exhaust gas supply pipe 13 (this supply pipe 13 is connected to the exhaust pipe 1c) are provided at the bottom.
１４は給水用のタンクで、給水管１４ａ、レベルスイッ
チ１４ｂとを備え、貯湯部１２のレベルスイッチ１２ｃ
からの要求信号に基づいて貯湯部１２への水を補給し、
自身への水の補給はレベルスイッチ１４ｂからの信号に
基づいて行うようになっている。Reference numeral 14 denotes a water supply tank, which includes a water supply pipe 14a and a level switch 14b, and a level switch 12c of the hot water storage section 12.
replenishes water to the hot water storage unit 12 based on a request signal from the
Water is replenished to itself based on a signal from the level switch 14b.
１５は温水ポンプ、１６は温水熱交換器で、その１次側
１６ａには温水ポンプ１５を介して与えられる潜熱回収
器２からの温水を熱源として、２次側に対して給水管１
７を介して与えられる水道水を温水に変換し、供給管１
８を介して貯湯槽１９を経て給湯するようになっている
。15 is a hot water pump, 16 is a hot water heat exchanger, the primary side 16a of which uses hot water from the latent heat recovery device 2 provided via the hot water pump 15 as a heat source, and the water supply pipe 1 is connected to the secondary side.
7 to convert the tap water given through the supply pipe 1 into hot water.
Hot water is supplied through a hot water storage tank 19 via a hot water tank 8.
２０は高温部２０ａ、低温部２０ｂとを有する温水槽（
蓄熱槽〉、２１は暖房用熱交換器、２２は吸収式冷温水
器（温水吸収式冷凍器）、２３は冷房用クーリングタワ
ーである。20 is a hot water tank (
21 is a heat exchanger for heating, 22 is an absorption cold/heater (hot water absorption refrigerator), and 23 is a cooling tower for air conditioning.
冷温水器２２は、その内部に臭化リチュウムが入ってお
り、温水が通過することにより、蒸発・凝縮を繰り返し
、気化潜熱によって冷水を得るようになっている。The water cooler/heater 22 contains lithium bromide therein, and when hot water passes through it, it repeats evaporation and condensation, and obtains cold water using latent heat of vaporization.
２４および２５は夫々ポンプである。24 and 25 are pumps, respectively.
２６ａおよび２６ｂは夫々暖房用の切換弁、また、２７
ａおよび２７ｂは夫々冷房用の切換弁である。26a and 26b are heating switching valves, and 27
A and 27b are switching valves for cooling, respectively.
なお、上記実施例では、簡単のため、給湯休止区間に設
けられる放熱回路およびそのための制御を行うため、貯
湯槽１９に設けられる温度センサ。In the above embodiment, for the sake of simplicity, a heat dissipation circuit is provided in the hot water supply suspension section, and a temperature sensor is provided in the hot water storage tank 19 to control the heat dissipation circuit.
レベルスイッチおよびこれら各スイッチの検出動作に基
づいて給湯ルートを閉ざし、放熱ルートを形成するため
の電磁弁、絞り弁および戻し弁等は図示を省略しである
が、これらのものが設けられているものとする。Level switches and electromagnetic valves, throttle valves, return valves, etc. for closing the hot water supply route and forming a heat radiation route based on the detection operations of these switches are not shown, but these are provided. shall be taken as a thing.
［作用］
エンジン１によって交流発電機２を駆動して電力を発生
すると共に、エンジン１から排出される高熱量の排気ガ
スが潜熱回収器２に供給されている。一方、潜熱回収器
２内では貯湯部１２の水が温水ポンプ１５を介して温水
熱交換器１６の１次側１６ａを経て供給管１０から潜熱
回収器２に対して循環的に供給される。[Operation] The engine 1 drives the alternator 2 to generate electric power, and high-calorie exhaust gas discharged from the engine 1 is supplied to the latent heat recovery device 2. On the other hand, in the latent heat recovery device 2, water in the hot water storage section 12 is cyclically supplied to the latent heat recovery device 2 from the supply pipe 10 via the hot water pump 15 and the primary side 16a of the hot water heat exchanger 16.
したがって、潜熱回収器２内で排気ガスと水が直接接触
し、いわゆる潜熱回収方式で貯湯部１２に温水を貯え、
温水ポンプ１５を介して循環されて加熱される。Therefore, the exhaust gas and water come into direct contact in the latent heat recovery device 2, and hot water is stored in the hot water storage section 12 using the so-called latent heat recovery method.
It is circulated and heated via the hot water pump 15.
なお、この間、循環される温水を熱源として温水熱交換
器１６で給水管１７から供給される水道水を加熱して温
水に変換し、この温水を供給管１６８を経て貯湯槽１９
に貯え、需要に応じて給湯する。貯湯部１２の湯量はレ
ベルスイッチ１２ｂで監視されており、その湯量が少な
くなったときはタンク１４から給水管１４ａを介して補
給される。During this time, the hot water heat exchanger 16 uses the circulating hot water as a heat source to heat the tap water supplied from the water supply pipe 17 and convert it into hot water, and this hot water is passed through the supply pipe 168 to the hot water tank 19.
The water is stored in the water and hot water is supplied according to demand. The amount of hot water in the hot water storage section 12 is monitored by a level switch 12b, and when the amount of hot water becomes low, it is replenished from the tank 14 via the water supply pipe 14a.
一方、冷却水熱交換器３によりエンジン１のジャケット
部分の排気ガスを熱源として加熱され、２次側に得られ
た温水は温水槽２０に供給される。On the other hand, the coolant heat exchanger 3 heats the exhaust gas from the jacket portion of the engine 1 as a heat source, and the hot water obtained on the secondary side is supplied to the hot water tank 20 .
この場合、暖房の季節においては、暖房用の弁２６ａ、
２６ｂを開き、冷房用の弁２７ａ、２７ｂは閉ざすよう
にするため、温水槽２ｏの温水は暖房用熱交換器２１の
１次側に供給され、その２次側からは加熱された暖房用
の温水が図示しない暖房機器へと供給される。In this case, during the heating season, the heating valve 26a,
26b is opened and the cooling valves 27a and 27b are closed, the hot water in the hot water tank 2o is supplied to the primary side of the heating heat exchanger 21, and the heated water for heating is supplied from the secondary side of the heating heat exchanger 21. Hot water is supplied to a heating device (not shown).
一方、冷房の季節においては、冷房用の弁２７ａ、２７
ｂを開き、暖房用の弁２６ａ、２６ｂが閉ざすように切
り換えるため、温水槽２０からの温水が冷温水器２２に
おいて冷水に変換され。On the other hand, during the cooling season, the cooling valves 27a, 27
Since the heating valves 26a and 26b are switched to open and close the heating valves 26a and 26b, hot water from the hot water tank 20 is converted to cold water in the water cooler/heater 22.
この冷水が冷房機器（図示せず）へ供給される。This cold water is supplied to a cooling device (not shown).
なお、クーリングタワー２３は冷房時に回収した暖風を
冷温水器２２から得て、外部に放熱するようにしている
。Note that the cooling tower 23 obtains warm air collected during cooling from the water cooler/heater 22 and radiates the heat to the outside.
［発明の効果コ
本発明は、上記のように潜熱回収器を利用して得られた
高効率の回収熱量を給湯のほか、冷・暖房等の他の用途
にも使用できるようにした熱回収システムであるから１
次のような優れた効果を有する。[Effects of the invention] The present invention is a heat recovery system that enables the highly efficient recovered heat obtained by using the latent heat recovery device as described above to be used for other purposes such as cooling and heating in addition to hot water supply. Because it is a system 1
It has the following excellent effects.
■潜熱回収方式により得られた多量の温水を給湯用のほ
か、冷・暖房用という他の熱回収用途にも使用するもの
であるため、総合効率を低下させないで複数用途に対す
る回収熱量の有効的な利用ができ、大変経済的である。■A large amount of hot water obtained through the latent heat recovery method is used not only for hot water supply but also for other heat recovery purposes such as cooling and heating, so the amount of recovered heat can be effectively used for multiple uses without reducing overall efficiency. It can be used in many ways and is very economical.
■このため、熱効率が大であるにもかかわらず潜熱回収
方式の熱回収システムを採用でき難かつた需要家も２本
システムを採用するための設備投資がし易くなった。■For this reason, even customers who had difficulty adopting a latent heat recovery system despite its high thermal efficiency can now easily invest in equipment to adopt a two-piece system.
第１図は本発明の一実施例を示す系統図、第２図は従来
例を示す系統図である。
１：エンジン
３：冷却水熱交換器
９：潜熱回収器
１８：供給管
１０ａ：蛇口
１１：充填層
１２：貯湯部
１６：温水熱交換器
１９：貯湯槽
２０：温水槽
２に暖房用熱交換器
２２：複合形吸収式冷温水器
２３：クーリングタワー
１５，２４，２５：ポンプ
２６ａ、２６ｂ：暖房用切換弁
２７ａ、２７ｂ：冷房用切換弁FIG. 1 is a system diagram showing one embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional example. 1: Engine 3: Cooling water heat exchanger 9: Latent heat recovery device 18: Supply pipe 10a: Faucet 11: Filled bed 12: Hot water storage section 16: Hot water heat exchanger 19: Hot water storage tank 20: Heat exchange for heating in hot water tank 2 Container 22: Composite absorption cold/heater 23: Cooling towers 15, 24, 25: Pumps 26a, 26b: Heating switching valves 27a, 27b: Cooling switching valves
Claims (1)
回収器に対して循環的に供給される水を潜熱回収方式に
より温水へと加熱し、この温水を熱源として温水熱交換
器において供給水をクリーンな温水に加熱して給湯する
ようにした給湯ルートと、 エンジンのジャケット部から熱回収した温水を熱源とし
て加熱される冷却水熱交換器、この冷却水熱交換器の温
水が供給される温水槽を介して暖房用の温水または冷房
用の冷水を得るようにした冷・暖房用ルート、 とを備えるようにしたことを特徴とする潜熱回収器を利
用した熱回収システム。 ２、給湯ルートには貯湯槽を備えて貯湯槽から給湯する
ようにし、冷・暖房用ルートは、暖房用熱交換器より成
る暖房ルートと吸収式冷温水器とクーリングタワーより
成る冷房ルートとを備え、暖房時と冷房時の各場合に温
水槽からの温水を暖房ルートと冷房ルートとに切り換え
て、暖房用の温水、冷房用の冷水を得るようにした請求
項１記載の潜熱回収器を利用した熱回収システム。[Claims] 1. Engine exhaust gas is led to a latent heat recovery device, water that is cyclically supplied to the latent heat recovery device is heated to hot water using a latent heat recovery method, and this hot water is used as a heat source to generate hot water. A hot water supply route that heats supply water to clean hot water in a heat exchanger, a cooling water heat exchanger that is heated using hot water recovered from the engine jacket as a heat source, and this cooling water heat exchanger. A cooling/heating route for obtaining hot water for heating or cold water for cooling through a hot water tank to which hot water is supplied. system. 2. The hot water supply route is equipped with a hot water storage tank from which hot water is supplied, and the cooling/heating route is equipped with a heating route consisting of a heating heat exchanger and a cooling route consisting of an absorption type water cooler/heater and a cooling tower. , utilizing the latent heat recovery device according to claim 1, wherein hot water from the hot water tank is switched to a heating route and a cooling route in each case of heating and cooling to obtain hot water for heating and cold water for cooling. heat recovery system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1177219A JP3031553B2 (en) | 1989-07-11 | 1989-07-11 | Heat recovery device using latent heat recovery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1177219A JP3031553B2 (en) | 1989-07-11 | 1989-07-11 | Heat recovery device using latent heat recovery unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0345868A true JPH0345868A (en) | 1991-02-27 |
| JP3031553B2 JP3031553B2 (en) | 2000-04-10 |
Family
ID=16027246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1177219A Expired - Lifetime JP3031553B2 (en) | 1989-07-11 | 1989-07-11 | Heat recovery device using latent heat recovery unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3031553B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345786A (en) * | 1992-08-27 | 1994-09-13 | Hitachi, Ltd. | Absorption heat pump and cogeneration system utilizing exhaust heat |
| CN107830655A (en) * | 2017-11-29 | 2018-03-23 | 大连派思新能源发展有限公司 | The distributed energy resource system of summer in winter dual-use can be achieved |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528622A (en) * | 1975-07-09 | 1977-01-22 | Kusuhara Seisakushiyo Kk | Tile made of cast metal and method of laying the tile |
| JPS5775145U (en) * | 1980-10-25 | 1982-05-10 | ||
| JPS57164240A (en) * | 1981-03-31 | 1982-10-08 | Sanyo Electric Co Ltd | Air conditoner |
-
1989
- 1989-07-11 JP JP1177219A patent/JP3031553B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528622A (en) * | 1975-07-09 | 1977-01-22 | Kusuhara Seisakushiyo Kk | Tile made of cast metal and method of laying the tile |
| JPS5775145U (en) * | 1980-10-25 | 1982-05-10 | ||
| JPS57164240A (en) * | 1981-03-31 | 1982-10-08 | Sanyo Electric Co Ltd | Air conditoner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345786A (en) * | 1992-08-27 | 1994-09-13 | Hitachi, Ltd. | Absorption heat pump and cogeneration system utilizing exhaust heat |
| CN107830655A (en) * | 2017-11-29 | 2018-03-23 | 大连派思新能源发展有限公司 | The distributed energy resource system of summer in winter dual-use can be achieved |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3031553B2 (en) | 2000-04-10 |
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