JP2003106652A - Hot water supply system using co2 heat pump - Google Patents

Hot water supply system using co2 heat pump

Info

Publication number
JP2003106652A
JP2003106652A JP2001340017A JP2001340017A JP2003106652A JP 2003106652 A JP2003106652 A JP 2003106652A JP 2001340017 A JP2001340017 A JP 2001340017A JP 2001340017 A JP2001340017 A JP 2001340017A JP 2003106652 A JP2003106652 A JP 2003106652A
Authority
JP
Japan
Prior art keywords
water heater
hot water
heat pump
electric
tank
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
JP2001340017A
Other languages
Japanese (ja)
Inventor
Hirotaka Wada
博孝 和田
Makoto Oyama
誠 尾山
Tatsuyuki Kishimoto
竜征 岸本
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.)
Daiwa House Industry Co Ltd
Daiwa General Research Institute Co Ltd
Original Assignee
Daiwa House Industry Co Ltd
Daiwa General Research Institute 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 Daiwa House Industry Co Ltd, Daiwa General Research Institute Co Ltd filed Critical Daiwa House Industry Co Ltd
Priority to JP2001340017A priority Critical patent/JP2003106652A/en
Publication of JP2003106652A publication Critical patent/JP2003106652A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00Domestic hot-water supply systems
    • F24D17/02Domestic hot-water supply systems using heat pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00Gas cycle refrigeration machines
    • F25B2309/06Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce initial cost and running cost while ensuring a necessary hot water supplying capacity in a hot water supply system using a CO<2> heat pump water heater. SOLUTION: A hot water storage tank 3 of the CO<2> heat pump water heater 1 and a tank 4a of an electric water heater 4 are connected, so that hot water in the hot water storage tank 3 of the CO<2> heat pump water heater 1 is fed to the tank 4a of the electric water heater. A heating temperature in the CO<2> heat pump water heater 1 is set lower than that in the electric water heater 4. The tank 4a of the electric water heater 4 supplies hot water to using sides A, B, C.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、COヒートポン
プを用いた給湯システムに関する。
TECHNICAL FIELD The present invention relates to a hot water supply system using a CO 2 heat pump.

【0002】[0002]

【従来の技術及び課題】COヒートポンプ給湯機は、
地球温暖化ガスの排出を少なくでき、しかも、加熱能力
に優れた二酸化炭素の特性から投入電力の3倍以上のエ
ネルギーを高温のお湯に熱交換できる等の優れた効果を
発揮しうるものとして注目されている。
2. Description of the Related Art A CO 2 heat pump water heater is
Attention is paid to the fact that it can reduce the emission of global warming gas, and can exhibit the excellent effect of exchanging energy more than 3 times the input power to high temperature hot water due to the characteristics of carbon dioxide, which has an excellent heating capacity. Has been done.

【0003】しかるに、このCOヒートポンプ給湯機
は、未だ高価であり、イニシャルコストが高くつくとい
う問題があり、そのため、例えば、単身者用の集合住宅
において1機を2世帯で共有するシステムというような
かたちでの実用化が進められている。
However, this CO 2 heat pump water heater has a problem that it is still expensive and the initial cost is high. Therefore, for example, a system in which one household is shared by two households in an apartment house for a single person. It is being put into practical use.

【0004】しかし、例えば上記のような単身者用集合
住宅において、1機を2世帯で共有することは可能であ
っても、1機を例えば3世帯で共有させようとする場
合、1機では給湯能力に不足を生じることがあり、かと
いって、2機を3世帯で共有するシステムにすると、高
価なCOヒートポンプ給湯機を3世帯で2機も使用す
ることになり、イニシャルコストが高くついてしまうと
いう問題を生じる。
However, for example, in the above-mentioned single-family housing complex, although it is possible for one household to be shared by two households, if one household is to be shared by three households, for example, There may be a shortage of hot water supply capacity. However, if a system in which two households are shared by three households is used, two expensive CO 2 heat pump water heaters will also be used by three households, resulting in high initial costs. There is a problem of being stuck.

【0005】本発明は、例えばそのような問題点に鑑
み、COヒートポンプ給湯機を用いた給湯システムに
おいて、必要な給湯能力を確保しつつ、イニシャルコス
トもランニングコストも低く抑えることができるように
することを課題とする。
In view of such a problem, the present invention enables a hot water supply system using a CO 2 heat pump water heater to ensure a required hot water supply capacity and to keep initial costs and running costs low. The task is to do.

【0006】[0006]

【課題を解決するための手段】上記の課題は、CO
ートポンプ給湯機の貯湯タンクと電気温水器のタンクと
が接続されて、COヒートポンプ給湯機の貯湯タンク
のお湯が電気温水器のタンクに送り込まれるようになさ
れており、かつ、COヒートポンプ給湯機での沸き上
げ温度は電気温水器での沸き上げ温度よりも低く設定さ
れ、この電気温水器のタンクから利用側に給湯されるよ
うになされていることを特徴とするCOヒートポンプ
を用いた給湯システムによって解決される。
[Means for Solving the Problems] The above problem is that the hot water tank of the CO 2 heat pump water heater is connected to the hot water tank of the electric water heater, and the hot water of the hot water tank of the CO 2 heat pump water heater is the tank of the electric water heater. And the boiling temperature of the CO 2 heat pump water heater is set lower than the boiling temperature of the electric water heater so that hot water is supplied from the tank of this electric water heater to the user side. It is solved by a hot water supply system using a CO 2 heat pump.

【0007】このシステムでは、COヒートポンプ給
湯機の給湯能力不足を、他のCOヒートポンプ給湯機
で補うのではなく、電気温水器で補うようにしたもので
あり、そのため、必要な給湯能力を確保しながら、シス
テム全体のイニシャルコストを低く抑えることができ
る。
[0007] In this system, the hot water supply incompetence of CO 2 heat pump water heater, rather than compensated by other CO 2 heat pump water heater, which was set to compensate an electric water heater, the reason, the hot water supply capacity required It is possible to keep the initial cost of the entire system low while securing it.

【0008】しかも、COヒートポンプ給湯機での沸
き上げ温度は電気温水器での沸き上げ温度よりも低く設
定され、COヒートポンプ給湯機の貯湯タンクのお湯
が電気温水器のタンクに送り込まれるようになされてい
るから、COヒートポンプ給湯機によって沸き上げら
れるお湯の量をCOヒートポンプ給湯機の能力範囲内
で多くすることができ、電気温水器では、水を一から沸
き上げるのではなく、COヒートポンプ給湯機で沸き
上げられたお湯を沸き上げるだけでよいから、電気温水
器のランニングコストも低く抑えることができ、その結
果、システム全体のランニングコストを低く抑えること
ができる。特に、上記のシステムにおいて、電気温水器
が深夜電力利用の電気温水器からなる場合は、システム
のランニングコストを非常に低く抑えることができる。
[0008] Moreover, boiling temperature of a CO 2 heat pump water heater is set lower than the boiling temperature of an electric water heater, so that the hot water of the hot water storage tank of CO 2 heat pump water heater is fed into the tank of an electric water heater Therefore, the amount of hot water boiled by the CO 2 heat pump water heater can be increased within the capacity range of the CO 2 heat pump water heater, and in the electric water heater, instead of boiling water from the beginning, Since it is only necessary to boil the hot water boiled by the CO 2 heat pump water heater, the running cost of the electric water heater can be kept low, and as a result, the running cost of the entire system can be kept low. In particular, in the above system, when the electric water heater is an electric water heater that uses midnight power, the running cost of the system can be kept very low.

【0009】なお、上記の課題は、基本的には、電気温
水器が備えられ、COヒートポンプ給湯機と前記電気
温水器とで沸き上げられ貯湯されたお湯が利用側に給湯
されるようになされていることを特徴とするCOヒー
トポンプを用いた給湯システムによって解決される。
The above-mentioned problem is basically that an electric water heater is provided, and hot water boiled up and stored by the CO 2 heat pump water heater and the electric water heater is supplied to the user side. It is solved by a hot water supply system using a CO 2 heat pump, which is characterized by being performed.

【0010】このシステムによれば、必要な給湯能力を
確保しながら、システム全体のイニシャルコストを低く
抑えることができるる。しかも、COヒートポンプ給
湯機を使用するものであるからそれ自体でランニングコ
ストを抑えることができると共に、COヒートポンプ
給湯機の使用により電気温水器のランニングコストも抑
えることができ、それによってシステム全体のランニン
グコストを低く抑えることが可能である。特に、電気温
水器が深夜電力利用のものからなる場合は、システムの
ランニングコストを非常に低く抑えることができる。即
ち、COヒートポンプ給湯機の貯湯タンクのお湯が電
気温水器のタンクに送り込まれる構成を採らないシステ
ムに構成されていてもよい。
According to this system, the initial cost of the entire system can be kept low while ensuring the required hot water supply capacity. Moreover, since the CO 2 heat pump water heater is used, the running cost can be suppressed by itself, and the running cost of the electric water heater can also be suppressed by using the CO 2 heat pump water heater, whereby the entire system can be suppressed. It is possible to keep the running cost of. In particular, when the electric water heater is of a type using electric power at midnight, the running cost of the system can be kept very low. That is, the system may not be configured so that the hot water in the hot water storage tank of the CO 2 heat pump water heater is sent to the tank of the electric water heater.

【0011】[0011]

【発明の実施の形態】次に、本発明の実施形態を図面に
基づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

【0012】図1に示す実施形態の給湯システムは、単
身者用集合住宅においてA,B,Cの3世帯を1単位と
した給湯システムに構成されており、A,B,Cの各世
帯にはそれぞれ、キッチン11、洗面所12、浴室13
が備えられ、それぞれの場所でお湯を利用できるように
なっている。
The hot water supply system of the embodiment shown in FIG. 1 is configured as a hot water supply system in which three households A, B, and C are set as one unit in a housing complex for a single person. Kitchen 11, washroom 12, bathroom 13
Is provided and hot water is available in each place.

【0013】このシステムには、1機のCOヒートポ
ンプ給湯機1が備えられている。このCOヒートポン
プ給湯機1において、2はヒートポンプユニットであ
り、3は貯湯タンクである。このCOヒートポンプ給
湯機1は、単身者用の集合住宅において、1機で2世帯
をまかなう能力はあるが、1機で3世帯をまかなうには
能力的に不足のあるものである。そのため、本システム
では、上記の3世帯A,B,Cをまかなうために、もう
1機のCOヒートポンプ給湯機を備えさせるというこ
とをせずに、電気温水器4を備えさせている。この電気
温水器4は深夜電力を利用して貯湯を行うことができる
ものであるのもよい。
This system is equipped with one CO 2 heat pump water heater 1. In this CO 2 heat pump water heater 1, 2 is a heat pump unit and 3 is a hot water storage tank. This CO 2 heat pump water heater 1 has the ability to cover two households with one machine in an apartment house for a single person, but is insufficient to cover three households with one machine. Therefore, in this system, in order to cover the above-mentioned three households A, B, and C, the electric water heater 4 is provided without providing another CO 2 heat pump water heater. The electric water heater 4 may be one that can store hot water by using electric power at midnight.

【0014】この電気温水器4は、そのタンク4aがC
ヒートポンプ給湯機1の貯湯タンク3と接続され、
COヒートポンプ給湯機1の貯湯タンク3のお湯が電
気温水器4のタンク4aに送り込まれるようになされて
いる。そして、COヒートポンプ給湯機1での沸き上
げ温度は電気温水器4での沸き上げ温度よりも低く設定
されており、利用側A,B,Cへは、電気温水器4のタ
ンク4aを通じて給湯されるようになされている。因み
に、電気温水器4の沸き上げ温度は例えば80°Cに設
定され、COヒートポンプ給湯機1での沸き上げ温度
は例えば65°Cに設定される。
The tank 4a of the electric water heater 4 is C
It is connected to the hot water storage tank 3 of the O 2 heat pump water heater 1,
The hot water in the hot water storage tank 3 of the CO 2 heat pump water heater 1 is fed into the tank 4 a of the electric water heater 4. The boiling temperature in the CO 2 heat pump water heater 1 is set lower than the boiling temperature in the electric water heater 4, and hot water is supplied to the users A, B, C through the tank 4 a of the electric water heater 4. It is designed to be done. Incidentally, the boiling temperature of the electric water heater 4 is set to, for example, 80 ° C, and the boiling temperature of the CO 2 heat pump water heater 1 is set to, for example, 65 ° C.

【0015】即ち、この給湯システムにおいて、CO
ヒートポンプ給湯機1に給水(5)されると、その水
(5)は、COヒートポンプ給湯機1で上記のような
65℃に加熱されてその貯湯タンク3に貯湯され、この
貯湯タンク3内のお湯(6)は、電気温水器4のタンク
4aに送られ、電気温水器4で上記のような80°Cに
沸き上げられてそのタンク4aに貯湯される。その間、
COヒートポンプ給湯機1では、電気温水器4に送ら
れて減少した分の水が給水(5)され、その分の沸き上
げが行われてタンク3にお湯が補給される。これによ
り、COヒートポンプ給湯機1と電気温水器4の各タ
ンク3,4aに貯湯され、これらのお湯によって利用側
の3世帯A,B,Cをまかなうに充分な給湯(7)がな
されるようになっている。
That is, in this hot water supply system, CO 2
When water (5) is supplied to the heat pump water heater 1, the water (5) is heated to the above-mentioned 65 ° C. by the CO 2 heat pump water heater 1 and stored in the hot water storage tank 3 in the hot water storage tank 3. The hot water (6) is sent to the tank 4 a of the electric water heater 4, is boiled to 80 ° C. as described above by the electric water heater 4, and is stored in the tank 4 a. in the meantime,
In the CO 2 heat pump water heater 1, the reduced amount of water sent to the electric water heater 4 is supplied (5), and the water is boiled for that amount to replenish the tank 3 with hot water. As a result, hot water is stored in the tanks 3 and 4a of the CO 2 heat pump water heater 1 and the electric water heater 4, and the hot water supplies sufficient hot water (7) to cover the three households A, B and C on the use side. It is like this.

【0016】上記の給湯システムでは、COヒートポ
ンプ給湯機1の給湯能力不足を、他のCOヒートポン
プ給湯機1の追加によって補うのではなく、電気温水器
4で補うようにしたものであるから、必要な給湯能力を
確保しながら、システム全体のイニシャルコストを低く
抑えることができる。
[0016] In the above hot water system, the hot water supply incompetence of CO 2 heat pump water heater 1, rather than compensated by addition of other CO 2 heat pump water heater 1, because is obtained as compensated by the electric water heater 4 The initial cost of the entire system can be kept low while ensuring the required hot water supply capacity.

【0017】しかも、COヒートポンプ給湯機1での
沸き上げ温度は電気温水器4での沸き上げ温度よりも低
く設定されているから、COヒートポンプ給湯機1に
よって沸き上げられるお湯の量をCOヒートポンプ給
湯機1の能力範囲内で多くすることができ、しかも、電
気温水器4では、水を一から沸き上げるのではなく、C
ヒートポンプ給湯機1で沸き上げられたお湯を沸き
上げるだけでよいから、電気温水器4のランニングコス
トを低く抑えることができ、その結果、必要な給湯量を
確保することができながら、システム全体のランニング
コストを低く抑えることができる。
[0017] Moreover, since boiling temperature of a CO 2 heat pump water heater 1 is set lower than the boiling temperature of the electric water heater 4, the amount of hot water is boiled by the CO 2 heat pump water heater 1 CO 2 It can be increased within the capacity range of the heat pump water heater 1, and the electric water heater 4 does not boil water from the beginning, but C
Since it is only necessary to boil the hot water boiled by the O 2 heat pump water heater 1, the running cost of the electric water heater 4 can be kept low, and as a result, the required amount of hot water can be secured while the system is being maintained. The overall running cost can be kept low.

【0018】この場合に、COヒートポンプ給湯機1
のタンク3から電気温水器4に送られてくるすべてのお
湯を電気温水器4で上記のような80°Cの温度に沸き
上げたうえで、利用側A,B,Cに給湯するようにした
場合であっても、電気温水器4は、COヒートポンプ
給湯機1で沸き上げられたお湯を沸き上げるだけでよい
から、夜間であるかそれ以外であるかを問わずランニン
グコストがそう大きくなることはないし、電気温水器4
での沸き上げに時間も要さない。もちろん、COヒー
トポンプ給湯機1での沸き上げも電気温水器4での沸き
上げも深夜に行い、深夜電力を有効活用するシステムと
すれば、ランニングコストは更に低く抑えることができ
るのはいうまでもない。
In this case, the CO 2 heat pump water heater 1
After boiling all the hot water sent from the tank 3 of the electric water heater 4 to the above-mentioned temperature of 80 ° C by the electric water heater 4, supply the hot water to the users A, B, C. Even if it is done, the electric water heater 4 only needs to boil the hot water boiled by the CO 2 heat pump water heater 1, so that the running cost is large regardless of whether it is at night or otherwise. It won't happen, electric water heater 4
It doesn't take much time to boil. Needless to say, if the CO 2 heat pump water heater 1 and the electric water heater 4 both perform boiling at midnight and a system that effectively uses the late-night power is used, the running cost can be further reduced. Nor.

【0019】以上に、本発明の実施形態を示したが、本
発明はこれに限られるものではなく、発明思想を逸脱し
ない範囲で、各種の変更が可能である。例えば、上記の
実施形態では、COヒートポンプ給湯機1と電気温水
器4をそれぞれ1機づつ備えさせた給湯システムに構成
されているが、COヒートポンプ給湯機1を複数機、
電気温水器4を1機備えさせたシステムに構成されても
よいし、COヒートポンプ給湯機1を1機、電気温水
器4を複数機備えさせたシステムに構成されてもよい。
もちろん、本発明の給湯システムは、単身者用集合住宅
の3世帯用のシステムに限られるものではなく、4世帯
以上であってもよいし、2世帯であってもよいし、1世
帯であってもよいし、単身者用でなくてもよいし、集合
住宅でなくてもよい。
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the hot water supply system is provided with one CO 2 heat pump water heater 1 and one electric water heater 4, but a plurality of CO 2 heat pump water heaters 1,
The system may be configured to include one electric water heater 4, or may be configured to include one CO 2 heat pump water heater 1 and a plurality of electric water heaters 4.
Of course, the hot water supply system of the present invention is not limited to a system for three households of a single-person housing complex, but may be four or more households, two households, or one household. It does not have to be a single person, and it does not have to be an apartment house.

【0020】[0020]

【発明の効果】本発明は、以上のとおりのものであるか
ら、CO2ヒートポンプ給湯機を用いた給湯システムに
おいて、必要な給湯能力を確保しつつ、イニシャルコス
トもランニングコストも低く抑えることができる。
According to the present invention, since those of As described above, the hot water system using a CO 2 heat Toponpu water heater, while ensuring hot water supply capacity required, it is possible to suppress initial costs running cost is low it can.

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

【図1】実施形態の給湯システムの構成図である。FIG. 1 is a configuration diagram of a hot water supply system according to an embodiment.

【符号の説明】[Explanation of symbols]

1…COヒートポンプ給湯機 3…貯湯タンク 4…電気温水器 4a…タンク A,B,C…利用側1 ... CO 2 heat pump water heater 3 ... Hot water storage tank 4 ... Electric water heater 4a ... Tanks A, B, C ... Use side

───────────────────────────────────────────────────── フロントページの続き (72)発明者 尾山 誠 奈良県奈良市左京六丁目6番地2 株式会 社大和総合技術研究所内 (72)発明者 岸本 竜征 奈良県奈良市左京六丁目6番地2 株式会 社大和総合技術研究所内   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Oyama             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute (72) Inventor Ryusei Kishimoto             6-6 Sakyo 6-2, Nara, Nara Stock Association             Inside Yamato Research Institute

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 COヒートポンプ給湯機の貯湯タンク
と電気温水器のタンクとが接続されて、COヒートポ
ンプ給湯機の貯湯タンクのお湯が電気温水器のタンクに
送り込まれるようになされており、かつ、COヒート
ポンプ給湯機での沸き上げ温度は電気温水器での沸き上
げ温度よりも低く設定され、この電気温水器のタンクか
ら利用側に給湯されるようになされていることを特徴と
するCOヒートポンプを用いた給湯システム。
1. A hot water storage tank of a CO 2 heat pump water heater and a tank of an electric water heater are connected to feed hot water from a hot water storage tank of the CO 2 heat pump water heater to a tank of the electric water heater, Moreover, the boiling temperature in the CO 2 heat pump water heater is set lower than the boiling temperature in the electric water heater, and the hot water is supplied from the tank of the electric water heater to the user side. Hot water supply system using a CO 2 heat pump.
【請求項2】 電気温水器が備えられ、COヒートポ
ンプ給湯機と前記電気温水器とで沸き上げられ貯湯され
たお湯が利用側に給湯されるようになされていることを
特徴とするCOヒートポンプを用いた給湯システム。
Wherein the electric water heater is provided, CO 2 that CO 2 the heat pump water heater is boiled in an electric water heater the hot water storage has been hot water characterized in that it is adapted to be hot water in the utilization-side Hot water supply system using a heat pump.
JP2001340017A 2001-09-30 2001-09-30 Hot water supply system using co2 heat pump Pending JP2003106652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001340017A JP2003106652A (en) 2001-09-30 2001-09-30 Hot water supply system using co2 heat pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001340017A JP2003106652A (en) 2001-09-30 2001-09-30 Hot water supply system using co2 heat pump

Publications (1)

Publication Number Publication Date
JP2003106652A true JP2003106652A (en) 2003-04-09

Family

ID=19154284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001340017A Pending JP2003106652A (en) 2001-09-30 2001-09-30 Hot water supply system using co2 heat pump

Country Status (1)

Country Link
JP (1) JP2003106652A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7458418B2 (en) 2003-01-13 2008-12-02 Carrier Corporation Storage tank for hot water systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01163553A (en) * 1987-12-18 1989-06-27 Daikin Ind Ltd Hot water supplier
JPH02109908A (en) * 1987-11-20 1990-04-23 Stihl Andreas Cutter hed for mower
JPH0618092A (en) * 1992-07-06 1994-01-25 Mitsubishi Electric Corp Centralized hot-water supplying device
JP2001082803A (en) * 1999-09-09 2001-03-30 Denso Corp Heat pump type hot water apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02109908A (en) * 1987-11-20 1990-04-23 Stihl Andreas Cutter hed for mower
JPH01163553A (en) * 1987-12-18 1989-06-27 Daikin Ind Ltd Hot water supplier
JPH0618092A (en) * 1992-07-06 1994-01-25 Mitsubishi Electric Corp Centralized hot-water supplying device
JP2001082803A (en) * 1999-09-09 2001-03-30 Denso Corp Heat pump type hot water apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7458418B2 (en) 2003-01-13 2008-12-02 Carrier Corporation Storage tank for hot water systems

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