JPH029341Y2 - - Google Patents
Info
- Publication number
- JPH029341Y2 JPH029341Y2 JP1981061218U JP6121881U JPH029341Y2 JP H029341 Y2 JPH029341 Y2 JP H029341Y2 JP 1981061218 U JP1981061218 U JP 1981061218U JP 6121881 U JP6121881 U JP 6121881U JP H029341 Y2 JPH029341 Y2 JP H029341Y2
- Authority
- JP
- Japan
- Prior art keywords
- hot water
- heat
- heat exchanger
- storage tank
- collector
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 125
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004378 air conditioning Methods 0.000 claims description 6
- 239000002828 fuel tank Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000013517 stratification Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 239000002918 waste heat Substances 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【考案の詳細な説明】
本考案は太陽熱および排熱利用ヒートポンプ冷
暖房給湯装置における貯湯槽装置に関するもので
ある。[Detailed Description of the Invention] The present invention relates to a hot water storage tank device in a heat pump air conditioning, heating, and hot water supply system that utilizes solar heat and waste heat.
従来一般の冷暖房給湯装置は第１図に示すよう
にポンプａとコレクターｂと貯湯槽ｃとポンプｄ
とヒートポンプ室外ユニツトｅと電気温水器ｆと
室内ユニツトｇとシスターンｋとを備えており、
ヒートポンプ室外ユニツトｅは水熱源熱交換器ｈ
と空気熱源熱交換器ｉとコンプレツサーｊとを備
えている。 As shown in Fig. 1, a conventional general air-conditioning/heating water supply system consists of a pump a, a collector b, a hot water storage tank c, and a pump d.
It is equipped with a heat pump outdoor unit e, an electric water heater f, an indoor unit g, and a cistern k.
Heat pump outdoor unit e is water heat source heat exchanger h
, an air heat source heat exchanger i, and a compressor j.
また前記貯湯槽ｃは第２図に示すように内部に
湯を貯める槽であり、この貯湯槽ｃにはコレクタ
ーｂからの出口管路ｌ、コレクターｂへの入口管
路ｍが接続してあつて、これらで集熱回路Ａを構
成しており、また貯湯槽ｃにはシスターンｋより
の管路ｎ、補助熱源としての電気温水器ｆへの管
路ｏが接続してあり、これらで給湯回路Ｂを構成
している。また、貯湯槽ｃにはヒートポンプ室外
ユニツトｅの水熱源熱交換器ｈからの管路ｐ、水
熱激熱交換器ｈへの管路ｑが接続してあり、これ
らでヒートポンプ回路Ｄを構成している。 In addition, the hot water storage tank c is a tank that stores hot water inside as shown in FIG. These constitute a heat collection circuit A, and the hot water storage tank c is connected to a pipe n from a cistern k and a pipe o to an electric water heater f as an auxiliary heat source, and these are used to supply hot water. It constitutes circuit B. In addition, a pipe p from the water heat source heat exchanger h of the heat pump outdoor unit e and a pipe q to the water heat intense heat exchanger h are connected to the hot water storage tank c, and these constitute a heat pump circuit D. ing.
そして、冬モード運転の場合、コレクターｂを
通じて大陽熱により市水を暖め貯湯槽ｃに貯え
る。貯湯槽ｃ内の水は給湯及びヒートポンプの熱
源として水熱源熱交換器ｈで使用される。貯湯槽
ｃ内の水は温度が低い場合、電気温水器ｆで暖め
られ給湯に使用される。 In the case of winter mode operation, city water is heated by solar heat through collector b and stored in hot water tank c. The water in the hot water storage tank c is used in a water heat source heat exchanger h as a heat source for hot water supply and a heat pump. When the temperature of the water in the hot water storage tank c is low, it is heated by an electric water heater f and used for hot water supply.
また、夏モード運転の場合コレクターｂは給湯
にのみ使用される。 Furthermore, in the case of summer mode operation, collector b is used only for hot water supply.
このように従来の貯湯槽ｃは、コレクタｂで集
熱した太陽熱及びヒートポンプの熱と市水とを熱
交換できるが、コレクタｂを流通した流体及びヒ
ートポンプの水熱源熱交換器ｈを流通した流体が
貯湯槽ｃ内に直接供給されるから、貯湯槽ｃ内で
各流体及び市水が攪拌されてしまうために市水と
太陽熱、ヒートポンプの熱を効率良く熱交換して
高温とすることができないばかりか、市水は太陽
熱、ヒートポンプの熱によつてのみ熱交換される
から貯湯槽ｃから排出される温水の温度は低く、
そのまま給湯場所に給湯できないから、貯湯槽ｃ
とは別に電気温水器ｆを設けて給湯しており、設
備費が高くなる。 In this way, the conventional hot water storage tank c can exchange heat between the solar heat collected by the collector b and the heat from the heat pump, and city water. is directly supplied into the hot water storage tank c, and the various fluids and city water are agitated within the hot water storage tank c, making it impossible to efficiently exchange heat between the city water, solar heat, and heat from the heat pump to reach a high temperature. Not only that, but the temperature of the hot water discharged from the hot water tank c is low because city water exchanges heat only with solar heat and heat from the heat pump.
Since hot water cannot be directly supplied to the hot water supply location, the hot water storage tank c
An electric water heater f is installed separately to supply hot water, which increases equipment costs.
本考案は上記の事情に鑑みなされたものであ
り、その目的は、市水と太陽熱、ヒートポンプの
熱を効率良く熱交換できると共に、貯湯槽から高
温の温水を給湯できるようにした冷暖房給湯装置
における貯湯槽装置を提供することを目的とす
る。 The present invention was developed in view of the above circumstances, and its purpose is to provide an air-conditioning/heating water heater that can efficiently exchange city water, solar heat, and heat from a heat pump, as well as supply high-temperature hot water from a hot water storage tank. The purpose is to provide a hot water storage tank device.
以下、本考案を第３図以下を参照して説明す
る。図面中１は貯湯槽であり、この貯湯槽１内に
はコレクター用熱交換器４、ヒートポンプ用熱交
換器３、バーナー２と温度レベルの低い順に挿入
してある。 Hereinafter, the present invention will be explained with reference to FIG. 3 and subsequent figures. In the drawing, 1 is a hot water storage tank, and a collector heat exchanger 4, a heat pump heat exchanger 3, and a burner 2 are inserted in the hot water storage tank 1 in descending order of temperature level.
図面中６はヒートポンプ室外ユニツトであり、
ヒートポンプ室外ユニツト６は水熱源熱交換器７
と空気熱源熱交換器８とコンプレツサー９とを備
えている。また１０はコレクター、１１は室内ユ
ニツト、１２，１８はポンプである。 6 in the drawing is a heat pump outdoor unit,
The heat pump outdoor unit 6 is a water heat source heat exchanger 7
, an air heat source heat exchanger 8 and a compressor 9. Further, 10 is a collector, 11 is an indoor unit, and 12 and 18 are pumps.
ポンプ１２の吸込側はコレクター１０の高温側
に第１管路１３を介して接続してあり、ポンプ１
２の吐出側は第２管路１４を介してコレクター用
熱交換器４の入口側に接続してあり、この第２管
路１４に逆流防止弁１５が設けてある。コレクタ
ー用熱交換器４の出口側は第３管路１６を介して
コレクター１０の低温側に接続してあり、この第
３管路１６に逆流防止弁１７が設けてある。他の
ポンプ１８の吸込側は第４管路１９を介してヒー
トポンプ用熱交換器３の出口側に接続してあり、
またこのポンプ１８の吸込側は第５管路２０を介
してコレクター用熱交換器４の出口側に接続して
ある。 The suction side of the pump 12 is connected to the high temperature side of the collector 10 via a first pipe line 13.
The discharge side of the heat exchanger 2 is connected to the inlet side of the collector heat exchanger 4 via a second pipe line 14, and the second pipe line 14 is provided with a check valve 15. The outlet side of the collector heat exchanger 4 is connected to the low temperature side of the collector 10 via a third pipe line 16, and this third pipe line 16 is provided with a check valve 17. The suction side of the other pump 18 is connected to the outlet side of the heat pump heat exchanger 3 via a fourth pipe line 19,
Further, the suction side of this pump 18 is connected to the outlet side of the collector heat exchanger 4 via a fifth pipe line 20.
ポンプ１８の吐出側は第６管路２２を介してヒ
ートポンプ室外ユニツトの水熱源熱交換器７の入
口側に接続してあり、この水熱源熱交換器７の出
口側はヒートポンプ用熱交換器３の入口側に第７
管路２３を介して接続してあり、この第７管路２
３には三方切換バルブ２４が設けてあり、三方切
換バルブ２４は第８管路２５を介してコレクター
用熱交換器４の入口側に接続してあり、この第８
管路２５に逆流防止弁２６が設けてある。 The discharge side of the pump 18 is connected to the inlet side of the water heat source heat exchanger 7 of the heat pump outdoor unit via the sixth pipe line 22, and the outlet side of the water heat source heat exchanger 7 is connected to the heat pump heat exchanger 3. No. 7 on the entrance side of
It is connected via a pipe line 23, and this seventh pipe line 2
3 is provided with a three-way switching valve 24, and the three-way switching valve 24 is connected to the inlet side of the collector heat exchanger 4 via an eighth pipe line 25.
A check valve 26 is provided in the conduit 25 .
貯湯槽１の底部には市水供給管路２７が接続し
てあり、この市水供給管路２７からの分岐管路２
８は混合弁２９の一方の接続口に接続してあり、
また貯湯槽１の上部から湯取出管路３０が出てい
てこの湯取出管路３０は混合弁２９の他方の接続
口に接続してある。バーナー２には燃料タンクよ
りの燃料供給管路３１が接続してある。 A city water supply pipe 27 is connected to the bottom of the hot water storage tank 1, and a branch pipe 2 from this city water supply pipe 27 is connected to the bottom of the hot water storage tank 1.
8 is connected to one connection port of the mixing valve 29,
Further, a hot water outlet pipe 30 comes out from the upper part of the hot water storage tank 1, and this hot water outlet pipe 30 is connected to the other connection port of the mixing valve 29. A fuel supply line 31 from a fuel tank is connected to the burner 2.
ヒートポンプ室外ユニツト６はヒートポンプ室
内ユニツト１１に第９、第10管路３２，３３を介
して接続してあり、第９管路３２にポンプ３４が
設けてある。 The heat pump outdoor unit 6 is connected to the heat pump indoor unit 11 via ninth and tenth pipe lines 32 and 33, and the ninth pipe line 32 is provided with a pump 34.
そして、コレクター１０、管路１４、コレクタ
ー用熱交換器４、第３管路１６、コレクター１０
で集熱回路A′を構成し、市水供給管路２７、貯
湯槽１、湯取出管路３０、混合弁２９とで給湯回
路B′を構成し、水熱源熱交換器７、第７管路２
３、ヒートポンプ用熱交換器３、第４管路１９、
水熱源熱交換器７でヒートポンプ回路D′を構成
し、燃料供給管路３１、バーナー２、貯湯槽１で
加温水回路E′を構成している。 Then, the collector 10, the pipe line 14, the collector heat exchanger 4, the third pipe line 16, the collector 10
The city water supply pipe 27, the hot water storage tank 1, the hot water outlet pipe 30, and the mixing valve 29 form the hot water supply circuit B'. Road 2
3, heat exchanger for heat pump 3, fourth pipe line 19,
The water heat source heat exchanger 7 constitutes a heat pump circuit D', and the fuel supply pipe 31, burner 2, and hot water storage tank 1 constitute a heated water circuit E'.
次に作動を説明する。 Next, the operation will be explained.
（冬モード運転の場合）
１ 給湯のみの場合
コレクター１０で暖められた集熱流体（熱媒
体）はコレクター用熱交換器４に入りここで貯湯
槽１内の下部の水に熱を放出して暖める。コレク
ター用熱交換器４で温められた水は軽いので、上
部に上昇して行き、貯湯槽１の上部より順々に温
度が上昇する。従つてコレクター用熱交換器４の
周辺の水はいつも貯湯槽１内で最も温度が低い状
態となつており、この為コレクター用熱交換器４
を流れる熱媒体の温度は低くて良く、コレクター
１の集熱効率は上昇する。貯湯槽１の上部の温度
が低い場合、上部の温水をバーナーで温めて使用
する。(In the case of winter mode operation) 1 In the case of hot water supply only The heat collection fluid (heat medium) warmed by the collector 10 enters the collector heat exchanger 4, where it releases heat to the water in the lower part of the hot water storage tank 1. warm. Since the water heated by the collector heat exchanger 4 is light, it rises to the upper part, and the temperature gradually increases from the upper part of the hot water storage tank 1. Therefore, the water around the collector heat exchanger 4 is always at the lowest temperature in the hot water storage tank 1, and for this reason, the water around the collector heat exchanger 4
The temperature of the heat medium flowing through the collector 1 may be low, and the heat collection efficiency of the collector 1 increases. When the temperature in the upper part of the hot water tank 1 is low, the hot water in the upper part is heated with a burner and used.
２ 給湯及び暖房の場合
コレクター用熱交換器４で温められた水は軽い
ので上部に上昇して行き、その熱の一部はヒート
ポンプ用熱交換器３により吸収され、暖房に使用
される。2. In the case of hot water supply and heating The water heated by the collector heat exchanger 4 is light, so it rises to the upper part, and a part of the heat is absorbed by the heat pump heat exchanger 3 and used for heating.
ヒートポンプ用熱交換器３により吸収されなか
つた残りの熱は更に上部に上昇して行き、貯湯槽
９上部より順々に水温を上昇させる。従つてコレ
クター用熱交換器４の周辺の水はいつも貯湯槽内
で最も温度の低い状態となつており、又次にヒー
トポンプ用熱交換器３の周辺の水が温度が低くな
る。そして貯湯槽内には下から上に向つて水温が
高くなる、いわゆる、温度成層の状態が保たれ
る。 The remaining heat that has not been absorbed by the heat pump heat exchanger 3 further rises to the upper part, causing the water temperature to rise sequentially from the upper part of the hot water storage tank 9. Therefore, the water around the collector heat exchanger 4 is always at the lowest temperature in the hot water storage tank, and the water around the heat pump heat exchanger 3 has the lowest temperature next. A state of so-called temperature stratification is maintained in the hot water storage tank, where the water temperature increases from the bottom to the top.
この為コレクター用熱交換器４を流れる熱媒体
の温度は低くて良く、コレクターの集熱効率は上
昇する。貯湯槽の上部の温度が低い場合、上部の
温水をバーナーで温めて使用する。 Therefore, the temperature of the heat medium flowing through the collector heat exchanger 4 may be low, and the heat collection efficiency of the collector increases. If the temperature at the top of the hot water tank is low, use a burner to heat the hot water at the top.
（夏モード運転の場合） １ 給湯のみの場合 冬モード運転の場合と同様。(When driving in summer mode) 1 For hot water supply only Same as when driving in winter mode.
２ 給湯及び冷房の場合
コレクター用熱交換器４で温められた水及びヒ
ートポンプ用熱交換器３で冷房の排熱により温め
られた水は軽いので、上部に上昇して行き、貯湯
槽の上部より順々に温度が上昇する。この際一般
的にはコレクター用熱交換器４よりヒートポンプ
用熱交換器３の方が温度が高いので、貯湯槽内に
は下から上に向つて水温が高くなる、いわゆる、
温度成層の状態が保たれる。温度成層の状態は熱
的に安定であり、無理がないため各部の効率は向
上する。貯湯槽の上部の温度が低い場合上部の温
水をバーナーで温めて使用する。2 In the case of hot water supply and cooling The water heated by the collector heat exchanger 4 and the water warmed by the exhaust heat of the air conditioner in the heat pump heat exchanger 3 are light, so they rise to the top and are removed from the top of the hot water storage tank. The temperature increases one after another. At this time, the temperature of the heat pump heat exchanger 3 is generally higher than that of the collector heat exchanger 4, so the water temperature in the hot water storage tank increases from the bottom to the top.
A state of temperature stratification is maintained. The temperature stratification state is thermally stable and reasonable, so the efficiency of each part improves. If the temperature at the top of the hot water tank is low, use a burner to heat the hot water at the top.
尚上記いずれの場合もバーナー２の温度はコレ
クター用熱交換器４及びヒートポンプ用熱交換器
３の温度よりも高く、バーナー使用時においても
貯湯槽内には温度成層が保たれる。即ち熱の流れ
る方向と熱交換器の設置方向、いずれも上下方向
とは、常に一致しており効率が良い。 In any of the above cases, the temperature of the burner 2 is higher than the temperature of the collector heat exchanger 4 and the heat pump heat exchanger 3, and temperature stratification is maintained in the hot water storage tank even when the burner is in use. That is, the direction of heat flow and the installation direction of the heat exchanger, both of which are vertical, always match, resulting in good efficiency.
本考案は以上の様に、貯湯槽１内に温度レベル
の低い順に底部側からコレクター用熱交換器４、
ヒートポンプ用熱交換器３、バーナー２を配設し
た構成であるから、貯湯槽１内の市水と太陽熱を
コレクター用熱交換器４で熱交換し、ヒートポン
プの熱と市水をヒートポンプ用熱交換器３で熱交
換して市水と太陽熱、ヒートポンプの熱が貯湯槽
１内で攪拌されることがなく、貯湯槽１内の市水
と太陽熱、ヒートポンプの熱を効率良く熱交換で
き、しかもコレクター用熱交換器４は貯湯槽１の
底部側に設けられ、ヒートポンプ用熱交換器３は
コレクター用熱交換器４の上部に設けてあるか
ら、コレクター用熱交換器４によつて太陽熱で効
率良く暖められた市水は上部に流れ、ヒートポン
プ用熱交換器３によつてヒートポンプの熱で効率
良く更に暖められて上部に流れ、さらにバーナー
２の熱で暖められて高温となつて貯湯槽１の上部
に溜る。 As described above, in the present invention, the collector heat exchanger 4,
Since the configuration includes a heat exchanger 3 for heat pump and burner 2, city water in hot water storage tank 1 and solar heat are exchanged with collector heat exchanger 4, and heat from the heat pump and city water are exchanged for heat pump. By exchanging heat with the collector 3, the city water, solar heat, and heat from the heat pump are not stirred in the hot water storage tank 1, and the city water in the hot water storage tank 1, solar heat, and heat from the heat pump can be exchanged efficiently. The heat exchanger 4 for the heat pump is installed at the bottom of the hot water storage tank 1, and the heat exchanger 3 for the heat pump is installed at the top of the heat exchanger 4 for the collector, so the heat exchanger 4 for the collector efficiently uses solar heat. The warmed city water flows to the upper part, is efficiently further warmed by the heat pump heat exchanger 3 using the heat from the heat pump, flows to the upper part, is further warmed by the heat of the burner 2, becomes high temperature, and is transferred to the hot water storage tank 1. Collects at the top.
したがつて、以上の各動作が相俟つて貯湯槽１
より高温の温水を直接給湯でき、貯湯槽１の外部
に温水器を設置しなくとも良いから設備費を安く
できる。 Therefore, the above operations combine to cause the hot water tank 1 to
Since hot water at a higher temperature can be directly supplied and there is no need to install a water heater outside the hot water tank 1, equipment costs can be reduced.
第１図は従来の冷暖房給湯装置の構成説明図、
第２図は従来の冷暖房給湯装置における貯湯槽の
構成説明図、第３図は本考案一実施例の貯湯槽を
備えた冷暖房給湯装置の構成説明図、第４図は本
考案一実施例の貯湯槽の構成説明図である。
１は貯湯槽、２はバーナー、３はヒートポンプ
用熱交換器、４はコレクター用熱交換器、７は水
熱源熱交換器。
Figure 1 is an explanatory diagram of the configuration of a conventional air-conditioning, heating, and hot-water supply system.
Fig. 2 is an explanatory diagram of the configuration of a hot water storage tank in a conventional air-conditioning/heating hot water supply system, Fig. 3 is an explanatory diagram of the configuration of a heating/cooling hot water supply system equipped with a hot water storage tank according to an embodiment of the present invention, and Fig. 4 is an explanatory diagram of the configuration of a hot water storage tank according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the configuration of a hot water storage tank. 1 is a hot water storage tank, 2 is a burner, 3 is a heat exchanger for a heat pump, 4 is a heat exchanger for a collector, and 7 is a water heat source heat exchanger.
Claims (1)
上部に湯取出管路３０を接続し、前記貯湯槽１内
の底部側にコレクター１０に接続されたコレクタ
ー用熱交換器４を設け、前記貯湯槽１内の該コレ
クター用熱交換器４より上方にヒートポンプの水
熱源熱交換器７に接続されたヒートポンプ用熱交
換器３を設け、前記貯湯槽１内の該ヒートポンプ
用熱交換器３より上方に燃料タンクに通じるバー
ナー２を設けたことを特徴とする冷暖房給湯装置
における貯湯槽装置。 A city water supply pipe 27 is connected to the bottom of the hot water tank 1,
A hot water outlet pipe 30 is connected to the upper part, and a collector heat exchanger 4 connected to the collector 10 is provided at the bottom side of the hot water storage tank 1, and a collector heat exchanger 4 is provided above the collector heat exchanger 4 in the hot water storage tank 1. A heat exchanger 3 for the heat pump connected to the water heat source heat exchanger 7 of the heat pump is provided in the hot water tank 1, and a burner 2 communicating with the fuel tank is provided above the heat exchanger 3 for the heat pump in the hot water storage tank 1. A hot water storage tank device in an air conditioning, heating, and hot water supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981061218U JPH029341Y2 (en) | 1981-04-30 | 1981-04-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981061218U JPH029341Y2 (en) | 1981-04-30 | 1981-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57174960U JPS57174960U (en) | 1982-11-05 |
| JPH029341Y2 true JPH029341Y2 (en) | 1990-03-07 |
Family
ID=29857470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981061218U Expired JPH029341Y2 (en) | 1981-04-30 | 1981-04-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH029341Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4023139B2 (en) | 2001-04-04 | 2007-12-19 | 株式会社デンソー | Hybrid water heater |
-
1981
- 1981-04-30 JP JP1981061218U patent/JPH029341Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57174960U (en) | 1982-11-05 |
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