JP2004294019A - Electric water heating apparatus - Google Patents

Electric water heating apparatus Download PDF

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Publication number
JP2004294019A
JP2004294019A JP2003090266A JP2003090266A JP2004294019A JP 2004294019 A JP2004294019 A JP 2004294019A JP 2003090266 A JP2003090266 A JP 2003090266A JP 2003090266 A JP2003090266 A JP 2003090266A JP 2004294019 A JP2004294019 A JP 2004294019A
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JP
Japan
Prior art keywords
heat exchanger
heat
hot water
heating
bathtub
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
Application number
JP2003090266A
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Japanese (ja)
Inventor
Takemi Kinoshita
武美 木下
Masanori Fujiwara
巨典 藤原
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.)
Hitachi Appliances Inc
Original Assignee
Hitachi Air Conditioning Systems Co Ltd
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Filing date
Publication date
Application filed by Hitachi Air Conditioning Systems Co Ltd filed Critical Hitachi Air Conditioning Systems Co Ltd
Priority to JP2003090266A priority Critical patent/JP2004294019A/en
Publication of JP2004294019A publication Critical patent/JP2004294019A/en
Pending legal-status Critical Current

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  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Control For Baths (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric water heating apparatus, saving the power and a power rate by reducing load of a heating means such as a heater, and boiling the water later in a bathtub and preheating water in a hot water storing tank by sharing parts of a pump and a pipeline with a heat exchanger for heating. <P>SOLUTION: The lower part in the hot water storing tank 1 is provided with the heat exchanger 8 for heat recovery to introduce water in the bathtub 7 and perform heat exchange, and the respective introduction pipes 62, 82 of the heat exchanger 6 for heating and the heat exchanger 8 for heat recovery are respectively connected to a lead-out pipe 71 of the bathtub 7. The respective lead-out pipes 61, 81 of the heat exchanger 6 for heating and the heat exchanger 8 for heat recovery are respectively connected to an introduction pipe 72 of the bathtub, and a selector valve 9 is provided to selectively switch a passage of the lead-out pipe of the bathtub 7 between the heat exchanger 6 for heating and the head exchanger 8 for heat recovery. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、電気温水器に関し、特に、ヒータ等の加熱手段の負荷を減じて電力と電力料金を節減するとともに、ポンプや配管の一部を加熱用熱交換器と共用して、貯湯タンク水の予熱と風呂の追い焚きとを行うことができる電気温水器に関するものである。
【０００２】
【従来の技術】
従来、深夜電力を用いた電気温水器により給湯するシステムでは、浴槽等に給湯する場合、所定の温度に設定した温水を、浴槽の給湯口や蛇口から供給するようになっている。
この電気温水器は、例えば、貯湯タンクと、該貯湯タンクの下部に設けられた給水管と、貯湯タンクの上部に設けられた給湯管と、貯湯タンク内の下部に設けられた下部ヒータと、貯湯タンク内の上部に設けられた上部ヒータと、貯湯タンク内の上部に設けられ、浴槽の水を導入して熱交換を行う加熱用熱交換器を備えている。
すなわち、この電気温水器では、水道管から供給された水道水を貯湯タンクの下部ヒータや上部ヒータにより加熱するとともに、この加熱した温水を、直接或いは別の水道管からの水道水と混合することにより設定温度に調節し、この温度調節した温水を配管を介して給湯口や蛇口に供給することができる。
また、加熱用熱交換器により、浴槽の水を貯湯タンク内の温水で加熱し、風呂の追い焚きもすることができる。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来の電気温水器では、貯湯タンクに供給された水道水をヒータによって加熱することから、冬期においては、低温の水を所定温度まで加熱するためにかなりの電力を使用する必要があり、深夜電力といえども電力料金が高くなるという問題を有している。また、水温が低すぎることにより、所定温度まで深夜電力の時間内で沸き上げきれなくなるという問題も有している。
【０００４】
本発明は、上記従来の電気温水器が有する問題点に鑑み、ヒータ等の加熱手段の負荷を減じて電力と電力料金を節減するとともに、ポンプや配管の一部を加熱用熱交換器と共用して、風呂の追い焚きと貯湯タンク水の予熱とを行うことができる電気温水器を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の電気温水器は、貯湯タンクと、該貯湯タンクの下部に設けられた給水管と、貯湯タンクの上部に設けられた給湯管と、貯湯タンク内の上部に設けられ、浴槽の水を導入して熱交換を行う加熱用熱交換器とを備えた電気温水器において、貯湯タンク内の下部に、浴槽の水を導入して熱交換を行う熱回収用熱交換器を設け、浴槽の導出管に、加熱用熱交換器と熱回収用熱交換器の各導入管をそれぞれ接続するとともに、浴槽の導入管に、加熱用熱交換器と熱回収用熱交換器の各導出管をそれぞれ接続し、浴槽の導出管の流路を加熱用熱交換器側又は熱回収用熱交換器側に選択的に切り替える切替弁を設けたことを特徴とする。
【０００６】
この電気温水器は、貯湯タンク内の下部に、浴槽の水を導入して熱交換を行う熱回収用熱交換器を設け、浴槽の導出管に、加熱用熱交換器と熱回収用熱交換器の各導入管をそれぞれ接続するとともに、浴槽の導入管に、加熱用熱交換器と熱回収用熱交換器の各導出管をそれぞれ接続し、浴槽の導出管の流路を加熱用熱交換器側又は熱回収用熱交換器側に選択的に切り替える切替弁を設けることから、貯湯タンクの水を浴槽の温水を利用して予熱し、ヒータ等の加熱手段の負荷を減じて電力と電力料金を節減するなどとともに、浴槽の導出管の流路を切替弁により切り替えるだけで、ポンプや配管の一部を加熱用熱交換器と共用して、前記貯湯タンク水の予熱と風呂の追い焚きとを行うことができる。
【０００７】
この場合において、熱回収用熱交換器の熱交換パイプを加熱用熱交換器の熱交換パイプより細径に設けることができる。
【０００８】
これにより、熱回収用熱交換器の循環流量を下げ、浴槽と貯湯タンクの温度差が小さい場合でも効率的に熱交換することができる。
【０００９】
【発明の実施の形態】
以下、本発明の電気温水器の実施の形態を図面に基づいて説明する。
【００１０】
図１に、本発明の電気温水器の１実施例を示す。
【００１１】
この電気温水器は、所要の容量を有する円筒状の貯湯タンク１と、該貯湯タンクの下部に設けられた給水管２と、貯湯タンク１の上部に設けられた給湯管３と、貯湯タンク１内の下部に設けられた下部ヒータ４と、貯湯タンク１内の上部に設けられた上部ヒータ５と、貯湯タンク１内の上部に設けられ、浴槽の水を導入して熱交換を行う加熱用熱交換器６とを備えている。
なお、ヒータは、適宜位置に１個設けるようにしたり、加熱手段として、ヒータに代えてヒートポンプユニット等の外部加熱手段を設けるようにすることもできる。
【００１２】
そして、この電気温水器は、貯湯タンク１内の下部に、浴槽７の水を導入して熱交換を行う熱回収用熱交換器８を設け、浴槽７の導出管７１に、加熱用熱交換器６と熱回収用熱交換器８の各導入管６２、８２をそれぞれ接続するとともに、浴槽の導入管７２に、加熱用熱交換器６と熱回収用熱交換器８の各導出管６１、８１をそれぞれ接続し、浴槽７の導出管７１の流路を加熱用熱交換器６側又は熱回収用熱交換器８側に選択的に切り替える切替弁９を設けている。
【００１３】
また、この電気温水器は、熱回収用熱交換器８の熱交換パイプ８３を加熱用熱交換器６の熱交換パイプ６３より細径に設けており、これにより、熱回収用熱交換器８の循環流量を下げ、浴槽７と貯湯タンク１の水温の差が小さい場合でも効率的に熱交換できるようにしている。
【００１４】
貯湯タンク１は、断熱材（図示省略）に覆われるとともに、縦長に形成されている。
深夜電力を利用して下部ヒータ４により加熱された水は、実際の使用時間になると、貯湯タンク１の上半部より上が高温の水で、下部は比較的低温の水となっている。
また、給湯や加熱用熱交換器６の使用により、貯湯タンク１内の上半部の水温が低下したときには、上部ヒータ５により加熱する。
【００１５】
給水管２は、図では省略しているが、水道管に接続されており、該水道管から貯湯タンク１に水を減った分だけ自動的に供給する。
また、給湯管３は、例えば、浴槽７や浴槽側の蛇口等に接続されており、途中で水道水と混合されることにより適温の温水を供給することができる。
【００１６】
切替弁９は、浴槽７の導出管７１が、加熱用熱交換器６の導入管６２と熱回収用熱交換器８の導入管８２とに接続される分岐部に配設されており、該切替弁９の上流側には追い焚き用のポンプ１０が設置されている。
【００１７】
かくして、本実施例の電気温水器は、貯湯タンク１内の下部に、浴槽７の水を導入して熱交換を行う熱回収用熱交換器８を設け、浴槽７の導出管７１に、加熱用熱交換器６と熱回収用熱交換器８の各導入管６２、８２をそれぞれ接続するとともに、浴槽７の導入管７２に、加熱用熱交換器６と熱回収用熱交換器８の各導出管６１、８１をそれぞれ接続し、浴槽７の導出管７１の流路を加熱用熱交換器６側又は熱回収用熱交換器８側に選択的に切り替える切替弁９を設けたことから、貯湯タンク１の水を浴槽７の温水を利用して予熱し、ヒータ４の負荷を減じて電力と電力料金を節減するとともに、浴槽７の導出管７１の流路を切替弁９により切り替えるだけで、ポンプ１０や配管の一部７１、７２を加熱用熱交換器６と共用して、前記貯湯タンク水の予熱と風呂の追い焚きとを行うことができる。
【００１８】
以上、本発明の電気温水器について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。
【００１９】
【発明の効果】
本発明の電気温水器によれば、貯湯タンク内の下部に、浴槽の水を導入して熱交換を行う熱回収用熱交換器を設け、浴槽の導出管に、加熱用熱交換器と熱回収用熱交換器の各導入管をそれぞれ接続するとともに、浴槽の導入管に、加熱用熱交換器と熱回収用熱交換器の各導出管をそれぞれ接続し、浴槽の導出管の流路を加熱用熱交換器側又は熱回収用熱交換器側に選択的に切り替える切替弁を設けることから、貯湯タンクの水を浴槽の温水を利用して予熱し、ヒータ等の加熱手段の負荷を減じて電力と電力料金を節減するなどとともに、浴槽の導出管の流路を切替弁により切り替えるだけで、ポンプや配管の一部を加熱用熱交換器と共用して、前記貯湯タンク水の予熱と風呂の追い焚きとを行うことができる。
【００２０】
また、熱回収用熱交換器の熱交換パイプを加熱用熱交換器の熱交換パイプより細径に設けることにより、熱回収用熱交換器の循環流量を下げ、浴槽と貯湯タンクの温度差が小さい場合でも効率的に熱交換することができる。
【図面の簡単な説明】
【図１】本発明の電気温水器の１実施例を示す断面図である。
【符号の説明】
１ 貯湯タンク
２ 給水管
３ 給湯管
４ 下部ヒータ
５ 上部ヒータ
６ 加熱用熱交換器
６１ 導出管
６２ 導入管
６３ 熱交換パイプ
７ 浴槽
７１ 導出管
７２ 導入管
８ 熱回収用熱交換器
８１ 導出管
８２ 導入管
８３ 熱交換パイプ
９ 切替弁
１０ ポンプ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric water heater, and in particular, reduces the load on a heating means such as a heater to save electricity and electricity charges, and also shares a part of a pump and a pipe with a heating heat exchanger to form a hot water storage tank. The present invention relates to an electric water heater capable of performing preheating of a bath and reheating of a bath.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a system for supplying hot water with an electric water heater using midnight power, when supplying water to a bathtub or the like, hot water set to a predetermined temperature is supplied from a hot water supply port or a faucet of the bathtub.
This electric water heater is, for example, a hot water storage tank, a water supply pipe provided at a lower part of the hot water storage tank, a hot water supply pipe provided at an upper part of the hot water storage tank, a lower heater provided at a lower part in the hot water storage tank, An upper heater is provided in the upper portion of the hot water storage tank, and a heating heat exchanger is provided in the upper portion of the hot water storage tank and exchanges heat by introducing water in the bathtub.
That is, in this electric water heater, the tap water supplied from the water pipe is heated by the lower heater and the upper heater of the hot water storage tank, and the heated hot water is mixed directly or with the tap water from another water pipe. The temperature can be adjusted to a set temperature, and the temperature-adjusted hot water can be supplied to a hot water port or a faucet via a pipe.
Further, the water in the bathtub can be heated by the hot water in the hot water storage tank by the heat exchanger for heating, and the bath can be reheated.
[0003]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional electric water heater, tap water supplied to a hot water storage tank is heated by a heater, so in winter, it is necessary to use considerable electric power to heat low-temperature water to a predetermined temperature. However, there is a problem that the electricity rate is high even for late-night power. Further, there is also a problem that the water cannot be sufficiently heated to a predetermined temperature within the time of midnight electric power because the water temperature is too low.
[0004]
The present invention has been made in consideration of the above-mentioned problems of the conventional electric water heater, and in addition to reducing the load of a heating means such as a heater, thereby saving power and electricity charges, a part of a pump and a pipe are shared with a heating heat exchanger. Then, an object of the present invention is to provide an electric water heater capable of performing reheating of a bath and preheating of hot water storage tank water.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the electric water heater of the present invention includes a hot water storage tank, a water supply pipe provided at a lower part of the hot water storage tank, a hot water supply pipe provided at an upper part of the hot water storage tank, and an upper part in the hot water storage tank. In an electric water heater provided with a heating heat exchanger for performing heat exchange by introducing water in a bath tub, heat recovery heat for introducing heat in the bath tub to perform heat exchange in a lower part of the hot water storage tank. A heat exchanger and a heat exchanger for heating and a heat exchanger for heat recovery are connected to the outlet pipe of the bathtub, respectively, and a heat exchanger for heating and heat exchange for heat recovery are connected to the inlet pipe of the bathtub. Each of the outlet pipes of the vessel is connected to each other, and a switching valve for selectively switching a flow path of the outlet pipe of the bathtub to the heating heat exchanger side or the heat recovery heat exchanger side is provided.
[0006]
This electric water heater is provided with a heat recovery heat exchanger that introduces water from the bath tub and performs heat exchange in the lower part of the hot water storage tank, and a heating heat exchanger and a heat recovery heat exchange are provided in the outlet pipe of the bath tub. In addition to connecting the respective inlet pipes of the heat exchanger, the respective outlet pipes of the heating heat exchanger and the heat recovery heat exchanger are connected to the inlet pipe of the bathtub, respectively, and the flow path of the outlet pipe of the bathtub is used for heat exchange for heating. Since a switching valve is provided for selectively switching between the heat exchanger side and the heat recovery heat exchanger side, the water in the hot water storage tank is preheated by using the hot water in the bathtub, and the load on the heating means such as the heater is reduced to reduce the power and electric power. In addition to reducing fees, simply switching the flow path of the outflow pipe of the bathtub with a switching valve, sharing part of the pump and piping with the heat exchanger for heating, preheating the hot water storage tank water and reheating the bath And can be done.
[0007]
In this case, the heat exchange pipe of the heat exchanger for heat recovery can be provided with a smaller diameter than the heat exchange pipe of the heat exchanger for heating.
[0008]
Thereby, the circulation flow rate of the heat recovery heat exchanger can be reduced, and heat exchange can be performed efficiently even when the temperature difference between the bathtub and the hot water storage tank is small.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an electric water heater of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 shows one embodiment of the electric water heater of the present invention.
[0011]
The electric water heater has a cylindrical hot water storage tank 1 having a required capacity, a water supply pipe 2 provided at a lower part of the hot water storage tank, a hot water supply pipe 3 provided at an upper part of the hot water storage tank 1, and a hot water storage tank 1. A lower heater 4 provided at a lower portion of the inside, an upper heater 5 provided at an upper portion of the hot water storage tank 1, and a heating device provided at an upper portion of the hot water storage tank 1 for introducing water in a bath tub and exchanging heat. And a heat exchanger 6.
One heater may be provided at an appropriate position, or an external heating means such as a heat pump unit may be provided as a heating means instead of the heater.
[0012]
In the electric water heater, a heat recovery heat exchanger 8 for introducing water in the bath tub 7 and exchanging heat by introducing water in the bath tub 7 is provided in a lower portion of the hot water storage tank 1. Each of the introduction pipes 62 and 82 of the heat exchanger 6 and the heat recovery heat exchanger 8 are connected to each other, and each of the introduction pipes 61 of the heating heat exchanger 6 and the heat recovery heat exchanger 8 are connected to the introduction pipe 72 of the bathtub. The switching valve 9 is connected to each of them, and a switching valve 9 for selectively switching the flow path of the outlet pipe 71 of the bathtub 7 to the heating heat exchanger 6 side or the heat recovery heat exchanger 8 side is provided.
[0013]
Further, in this electric water heater, the heat exchange pipe 83 of the heat recovery heat exchanger 8 is provided with a smaller diameter than the heat exchange pipe 63 of the heating heat exchanger 6, whereby the heat recovery heat exchanger 8 Is reduced so that heat exchange can be performed efficiently even when the difference between the water temperatures of the bathtub 7 and the hot water storage tank 1 is small.
[0014]
Hot water storage tank 1 is covered with a heat insulating material (not shown) and is formed in a vertically long shape.
In the actual use time, the water heated by the lower heater 4 using the late-night electric power has high temperature water above the upper half of the hot water storage tank 1 and relatively low temperature water below.
When the water temperature in the upper half of the hot water storage tank 1 decreases due to the supply of hot water and the use of the heat exchanger 6 for heating, the hot water is heated by the upper heater 5.
[0015]
Although not shown in the drawing, the water supply pipe 2 is connected to a water supply pipe, and automatically supplies water from the water supply pipe to the hot water storage tank 1 by an amount corresponding to a reduced amount of water.
The hot water supply pipe 3 is connected to, for example, the bathtub 7 or a faucet on the bathtub side, and can supply a suitable temperature of hot water by being mixed with tap water on the way.
[0016]
The switching valve 9 is provided at a branch where the outlet pipe 71 of the bathtub 7 is connected to the inlet pipe 62 of the heating heat exchanger 6 and the inlet pipe 82 of the heat recovery heat exchanger 8. On the upstream side of the switching valve 9, a pump 10 for reheating is installed.
[0017]
Thus, the electric water heater of the present embodiment is provided with a heat recovery heat exchanger 8 for introducing water in the bathtub 7 and exchanging heat by introducing water in the bathtub 7 in the lower part of the hot water storage tank 1, Each of the inlet pipes 62 and 82 of the heat exchanger 6 for heat recovery and the heat exchanger 8 for heat recovery are connected respectively, and each of the heat exchanger 6 for heating and the heat exchanger 8 for heat recovery 8 is connected to the inlet pipe 72 of the bathtub 7. Since the outlet pipes 61 and 81 are respectively connected and the switching valve 9 for selectively switching the flow path of the outlet pipe 71 of the bathtub 7 to the heating heat exchanger 6 side or the heat recovery heat exchanger 8 side is provided, The water in the hot water storage tank 1 is preheated by using the hot water in the bathtub 7 to reduce the load on the heater 4 to save power and electricity, and the flow path of the outlet pipe 71 of the bathtub 7 is simply switched by the switching valve 9. , The pump 10 and part of the pipes 71 and 72 are shared with the heat exchanger 6 for heating, Reheating of pre-heating and bath clauses water and can be carried out.
[0018]
As described above, the electric water heater according to the present invention has been described based on the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the configuration may be appropriately changed without departing from the gist thereof. can do.
[0019]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the electric water heater of this invention, the heat exchanger for heat collection | recovery which introduces water of a bathtub and performs heat exchange in the lower part in a hot-water storage tank is provided, and the heat exchanger for heating and a heat exchanger are provided in the outlet pipe of a bathtub. Connect each inlet pipe of the recovery heat exchanger, and connect each outlet pipe of the heating heat exchanger and the heat recovery heat exchanger to the inlet pipe of the bathtub, respectively, and connect the flow path of the outlet pipe of the bathtub. Since a switching valve for selectively switching between the heating heat exchanger side and the heat recovery heat exchanger side is provided, the water in the hot water storage tank is preheated using the hot water in the bathtub, and the load on the heating means such as a heater is reduced. In addition to saving power and electricity charges, simply switching the flow path of the outlet pipe of the bathtub by a switching valve, sharing a part of the pump and piping with the heat exchanger for heating, preheating the hot water storage tank water and You can do the reheating of the bath.
[0020]
Also, by providing the heat exchange pipe of the heat recovery heat exchanger with a smaller diameter than the heat exchange pipe of the heating heat exchanger, the circulation flow rate of the heat recovery heat exchanger is reduced, and the temperature difference between the bathtub and the hot water storage tank is reduced. Heat exchange can be performed efficiently even in a small case.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of an electric water heater according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Hot water supply pipe 4 Lower heater 5 Upper heater 6 Heating heat exchanger 61 Outlet pipe 62 Inlet pipe 63 Heat exchange pipe 7 Bathtub 71 Outlet pipe 72 Inlet pipe 8 Heat recovery heat exchanger 81 Outlet pipe 82 Inlet pipe 83 Heat exchange pipe 9 Switching valve 10 Pump

Claims (2)

貯湯タンクと、該貯湯タンクの下部に設けられた給水管と、貯湯タンクの上部に設けられた給湯管と、貯湯タンク内の上部に設けられ、浴槽の水を導入して熱交換を行う加熱用熱交換器とを備えた電気温水器において、貯湯タンク内の下部に、浴槽の水を導入して熱交換を行う熱回収用熱交換器を設け、浴槽の導出管に、加熱用熱交換器と熱回収用熱交換器の各導入管をそれぞれ接続するとともに、浴槽の導入管に、加熱用熱交換器と熱回収用熱交換器の各導出管をそれぞれ接続し、浴槽の導出管の流路を加熱用熱交換器側又は熱回収用熱交換器側に選択的に切り替える切替弁を設けたことを特徴とする電気温水器。A hot water storage tank, a water supply pipe provided at a lower part of the hot water storage tank, a hot water supply pipe provided at an upper part of the hot water storage tank, and a heating apparatus provided at an upper part in the hot water storage tank and introducing heat in a bathtub to perform heat exchange In the electric water heater equipped with a heat exchanger for heat recovery, a heat recovery heat exchanger for introducing water in the bath tub to perform heat exchange is provided in the lower part of the hot water storage tank, and a heat exchange pipe for heating is provided in an outlet pipe of the bath tub. The heat exchanger for heat recovery and the heat exchanger for heat recovery are connected to each other, and the heat exchanger for heating and the heat exchanger for heat recovery are connected to the inlet for the bathtub, respectively. An electric water heater comprising a switching valve for selectively switching a flow path to a heating heat exchanger side or a heat recovery heat exchanger side. 熱回収用熱交換器の熱交換パイプを加熱用熱交換器の熱交換パイプより細径に設けたことを特徴とする請求項１記載の電気温水器。The electric water heater according to claim 1, wherein the heat exchange pipe of the heat recovery heat exchanger is provided with a smaller diameter than the heat exchange pipe of the heating heat exchanger.
JP2003090266A 2003-03-28 2003-03-28 Electric water heating apparatus Pending JP2004294019A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010041653A1 (en) * 2008-10-07 2010-04-15 ダイキン工業株式会社 Hot water system
EP4043800A1 (en) 2021-02-10 2022-08-17 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating
EP4043801A1 (en) 2021-02-10 2022-08-17 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001336833A (en) * 2000-05-30 2001-12-07 Takagi Ind Co Ltd Heat exchanging method, heat exchanger and heat exchanging system
JP2002195651A (en) * 2000-12-28 2002-07-10 Chofu Seisakusho Co Ltd Hot-water supply system utilizing waste heat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001336833A (en) * 2000-05-30 2001-12-07 Takagi Ind Co Ltd Heat exchanging method, heat exchanger and heat exchanging system
JP2002195651A (en) * 2000-12-28 2002-07-10 Chofu Seisakusho Co Ltd Hot-water supply system utilizing waste heat

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010041653A1 (en) * 2008-10-07 2010-04-15 ダイキン工業株式会社 Hot water system
EP4043800A1 (en) 2021-02-10 2022-08-17 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating
EP4043801A1 (en) 2021-02-10 2022-08-17 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating
WO2022172867A1 (en) 2021-02-10 2022-08-18 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating
WO2022172865A1 (en) 2021-02-10 2022-08-18 Daikin Industries, Ltd. System for producing heat for domestic hot water or central heating

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