DE102008020637A1 - Hot water supply system comprises a hot water tank, in which the hot water is heated with a heat generator at a predetermined temperature, and a circulation line, into which the hot water is pumped with a circulating pump - Google Patents
Hot water supply system comprises a hot water tank, in which the hot water is heated with a heat generator at a predetermined temperature, and a circulation line, into which the hot water is pumped with a circulating pump Download PDFInfo
- Publication number
- DE102008020637A1 DE102008020637A1 DE102008020637A DE102008020637A DE102008020637A1 DE 102008020637 A1 DE102008020637 A1 DE 102008020637A1 DE 102008020637 A DE102008020637 A DE 102008020637A DE 102008020637 A DE102008020637 A DE 102008020637A DE 102008020637 A1 DE102008020637 A1 DE 102008020637A1
- Authority
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- Germany
- Prior art keywords
- hot water
- heat
- heat pump
- temperature
- circulation line
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 3
- 239000007924 injection Substances 0.000 claims abstract description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 2
- 239000001569 carbon dioxide Substances 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 9
- 239000003651 drinking water Substances 0.000 description 5
- 235000020188 drinking water Nutrition 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 208000007764 Legionnaires' Disease Diseases 0.000 description 4
- 241000589248 Legionella Species 0.000 description 3
- 239000012267 brine Substances 0.000 description 2
- 239000013529 heat transfer fluid Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/0073—Arrangements for preventing the occurrence or proliferation of microorganisms in the water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/0078—Recirculation systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/02—Domestic hot-water supply systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
- F24D19/1069—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water regulation in function of the temperature of the domestic hot water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
- F24D3/082—Hot water storage tanks specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/04—Sensors
- F24D2220/042—Temperature sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2240/00—Characterizing positions, e.g. of sensors, inlets, outlets
- F24D2240/26—Vertically distributed at fixed positions, e.g. multiple sensors distributed over the height of a tank, or a vertical inlet distribution pipe having a plurality of orifices
Abstract
Description
Die Erfindung betrifft eine Warmwasserversorgungsanlage mit einem Warmwasserspeicher, in dem Warmwasser mit einem Wärmeerzeuger auf eine vorgegebene Temperatur aufgewärmt wird, und einer Zirkulationsleitung, in der Warmwasser mit einer Zirkulationspumpe umgepumpt wird.The Invention relates to a hot water supply system with a hot water tank, in the hot water with a heat generator to a predetermined Temperature is warmed up, and a circulation line, in the hot water with a circulation pump is pumped.
Beim heutigen Stand der Technik wird mit einem Wärmeerzeuger, insbesondere einer Wärmepumpe, das Wasser einer Warmwasserversorgungsanlage in einem Warmwasserspeicher ohne Direktstrom auf eine Warmwassertemperatur von 50–53°C effizient erwärmt. Mit einem elektrisch direktbetriebenen Heizflansch kann eine höhere Temperatur (zumindest einmal am Tag) erreicht werden. Im stabilen Betrieb sind diese Wärmepumpen durchaus in der Lage, Trinkwassertemperaturen von 60°C ausschließlich mit dem Kälteprozess zu erreichen, wenn ein kleiner Massenstrom in der Zirkulationsleitung gefahren wird, allerdings mit vermindertem Wirkungsgrad.At the current state of the art is using a heat generator, in particular a heat pump, the water of a hot water supply system in a hot water tank without direct current to a hot water temperature heated efficiently from 50-53 ° C. With a electrically driven heating flange can be a higher Temperature (at least once a day) can be achieved. In stable operation These heat pumps are quite capable of drinking water temperatures of 60 ° C exclusively with the refrigeration process to reach when a small mass flow in the circulation line driven is, but with reduced efficiency.
Solange Warmwasser an einer Zapfstelle verbraucht wird, strömt legionellenfreies Wasser aus dem Speicher in die Zirkulationsleitung. Weiterhin strömt in diesem Fall kaltes Wasser nach. In der Praxis kommen sehr lange Betriebsphasen vor, in denen dem Speicher ausschließlich Zirkulationsverluste entnommen werden. Der Legionellenschutz schreibt hier vor, dass das zurückfließende Wasser mindestens 55°C haben muss.So long Hot water is consumed at a tap, flows Legionella-free water from the storage in the circulation line. Furthermore, cold water flows in this case. In In practice, very long operating phases occur in which the memory only circulation losses are taken. Of the Legionella protection stipulates here that the back flowing Water must be at least 55 ° C.
Gemäß
Aufgabe der Erfindung ist es, insbesondere bei einer Warmwassergroßanlage die Temperatur des zirkulierenden Trinkwassers mit möglichst geringen Energieverlusten und geringem Energieaufwand auf einer Temperatur von ca. 60°C zu halten.task The invention is, especially in a large hot water system the temperature of the circulating drinking water with as possible low energy losses and low energy consumption on one Temperature of about 60 ° C to hold.
Gelöst ist die Aufgabe durch die Merkmale des Anspruchs 1. Vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen gegeben. Gemäß Anspruch 11 und 12 ist ein Verfahren beschrieben.Solved is the object by the features of claim 1. Advantageous Embodiments of the invention are in the subclaims where. According to claim 11 and 12 is a method described.
In einer Zirkulationsleitung ist ein Wärmetauscher einer Wärmepumpe eingebaut, mit der das zirkulierende Warmwasser auf eine Temperatur von ca. 60°C erwärmt wird.In a circulation pipe is a heat exchanger of a heat pump installed, with the circulating hot water to a temperature is heated by about 60 ° C.
In einem Ausführungsbeispiel mündet eine Rücklaufleitung der Zirkulationsleitung in eine Warmwasserleitung hinter dem Warmwasserspeicher, und das Warmwasser durchströmt den Warmwasserspeicher nicht.In an embodiment opens a return line the circulation line in a hot water pipe behind the hot water tank, and the hot water does not flow through the hot water tank.
Gemäß einem anderen Ausführungsbeispiel mündet die Rücklaufleitung der Zirkulationsleitung in den oberen Bereich des Warmwasserspeichers, in den das Warmwasser der Zirkulationsleitung zurückströmt.According to one another embodiment, the return line opens the circulation line in the upper area of the hot water tank, in which the hot water of the circulation line flows back.
Bei sehr großen Warmwasseranlagen sind wenigstens zwei Wärmepumpen in die Zirkulationsleitung eingebaut, insbesondere nach langen Durchlaufstrecken des Warmwassers und an Stellen, wo die Temperatur des Warmwassers insbesondere unter 55°C sinkt. Das Warmwasser wird dort von einer Wärmepumpe wieder auf ca. 60°C erwärmt.at very large hot water systems are at least two heat pumps installed in the circulation line, especially after long passages of hot water and in places where the temperature of hot water especially below 55 ° C drops. The hot water will be there heated by a heat pump back to about 60 ° C.
Die in der Zirkulationsleitung angeordnete Wärmepumpe ist in vorteilhafter Weise eine Abluftwärmepumpe, die die Abluft eines Gebäudes abgekühlt und die der Luft entnommene Wärme dem Warmwasser, welches in der Zirkulationsleitung umgepumpt wird, zuführt, insbesondere durch eine Anordnung der Wärmepumpe in der Rücklaufleitung.The arranged in the circulation pipe heat pump is in Advantageously, an exhaust air heat pump, which the exhaust air cooled down of a building and taken from the air Heat the hot water, which in the circulation pipe is pumped, feeds, in particular by an arrangement the heat pump in the return line.
Alternativ besteht die Möglichkeit, die Wärmepumpe in die Wasserleitung hinter dem Warmwasserspeicher, insbesondere hinter der Einmündung der Rücklaufleitung in die Wasserleitung einzubauen.alternative there is the possibility of the heat pump in the Water pipe behind the hot water tank, in particular behind the confluence of the return line in the water pipe install.
Der Wärmeerzeuger, mit dem das Warmwasser in dem Warmwasserspeicher erwärmt wird, ist vorteilhafter Weise eine Luft/Wasser- oder Sole/Wasser-Wärmepumpe und/oder eine Solaranlage.Of the Heat generator with which the hot water in the hot water tank is heated, is advantageously an air / water or brine / water heat pump and / or a solar system.
Die in der Zirkulationsleitung angeordnete Wärmepumpe wird in vorteilhafter Weise mit CO2 als Kältemittel betrieben oder sie weist zwei Verdichter auf, zwischen denen eine Einspritzung dampfförmigen Kältemittels erfolgt. Somit wird effizient eine hohe Warmwassertemperatur, insbesondere über 55°C erreicht.The arranged in the circulation pipe heat pump is operated advantageously with CO 2 as the refrigerant or it has two compressors, between which an injection of vapor refrigerant takes place. Thus, a high hot water temperature, in particular above 55 ° C is efficiently achieved.
Mit einem Verfahren wird die Wärmepumpe, deren Wärmetauscher in der Zirkulationsleitung eingesetzt ist, dann eingeschaltet, wenn die von einem Temperaturfühler der Zirkulationsleitung gemessene Temperatur des zirkulierenden Warmwassers unter eine Temperatur von 55°C absinkt, und/oder die Wärmepumpe wird leistungsreguliert betrieben, wobei die Temperatur des Warmwassers, gemessen von einem Temperaturfühler der Zirkulationsleitung, nach dem Durchfließen des Wärmetauschers eine Temperatur von ca. 60°C aufweist.With One method is the heat pump, its heat exchanger is inserted in the circulation pipe, then turned on when that of a temperature sensor of the circulation pipe measured temperature of the circulating hot water below a temperature drops from 55 ° C, and / or the heat pump is operated in a regulated mode, the temperature of the hot water, measured by a temperature sensor of the circulation line, after flowing through the heat exchanger a Temperature of about 60 ° C.
Mit einem alternativen Verfahren wird der Volumenstrom in einer Zirkulationsleitung mit einer Zirkulationspumpe so eingeregelt, dass die Temperatur des durch den Wärmetauscher fließenden Warmwassers, bei voller Heizleistung der Wärmepumpe, nach dem Wärmetauscher eine Temperatur von ca. 60°C aufweist.With an alternative method, the Vo Lumenstrom regulated in a circulation line with a circulation pump so that the temperature of the hot water flowing through the heat exchanger, at full heat output of the heat pump, after the heat exchanger has a temperature of about 60 ° C.
Die Erfindung zeichnet sich dadurch aus, dass ein herkömmlicher Wärmeerzeuger, wie eine Luft/Wasser- oder Sole/Wasser-Wärmepumpe, den Warmwasserspeicher aufheizt und mit einer zusätzlichen, vorzugsweise kleineren Wärmepumpe, insbesondere Abluftwärmepumpe, die vorzugsweise mit dem Kältemittel CO2 arbeitet, das zurückfließende Zirkulationswasser wieder auf 60°C erwärmt wird. Das Zirkulationswasser durchströmt den Warmwasserspeicher in einem Ausführungsbeispiel nicht. Durch die Bereitstellung einer kleinen Wärmepumpe mit einer Heizleistung, die gerade der Verlustleistung des durch die Zirkulationsleitung strömenden Wassers entspricht, wird effizient und dauerhaft in der Zirkulationsleitung eine Zieltemperatur von ca. 60°C erreicht. Die Heizleistung der Wärmepumpe, deren Wärmetauscher in der Zirkulationsleitung angeordnet ist, liegt in vorteilhafter Weise zwischen ca. 0,5 bis 3 kW, je nach Wärmebedarf der Warmwasserversorgungsanlage liegt die Heizleistung auch darüber. Das Warmwasser aus der Zirkulationsleitung fließt entsprechend der vorgeschlagenen Lösung nicht mit ca. 55°C in den Warmwasserspeicher zurück, sondern wird von der zusätzlichen Wärmepumpe direkt in der Zirkulationsleitung nacherwärmt. Das ermöglicht insbesondere den Einbau von Luftwärmepumpen als Wärmeerzeuger zur Aufladung des Warmwassers im Warmwasserspeicher in Sanierungsobjekten in der Wohnungswirtschaft.The invention is characterized in that a conventional heat generator, such as an air / water or brine / water heat pump, heats the hot water tank and with an additional, preferably smaller heat pump, in particular exhaust air heat pump, which preferably operates with the refrigerant CO 2 , the flowing back circulation water is heated to 60 ° C. The circulation water does not flow through the hot water tank in one embodiment. By providing a small heat pump with a heat output that corresponds precisely to the power loss of the water flowing through the circulation line, a target temperature of approx. 60 ° C is efficiently and permanently achieved in the circulation line. The heat output of the heat pump, whose heat exchanger is arranged in the circulation line, is advantageously between about 0.5 to 3 kW, depending on the heat demand of the hot water supply system, the heating power is also about. The hot water from the circulation line flows according to the proposed solution not with about 55 ° C back into the hot water tank, but is reheated by the additional heat pump directly in the circulation line. This allows in particular the installation of air heat pumps as a heat generator for charging the hot water in the hot water tank in renovation projects in the housing industry.
In
der Figur ist eine Warmwasserversorgungsanlage
An
das Rohr
Der
Warmwasserspeicher
Mit
einer Zirkulationspumpe
Die
Wärmepumpe
Alternativ
wird die Wärmepumpe
Die
Wärmepumpe
Die
Erfindung umfasst auch die effiziente Erwärmung des Warmwasserspeichers
In
einem anderen Ausführungsbeispiel wird dem Warmwasserspeicher
Der
Warmwasserspeicher
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 102006033834 A1 [0004] - DE 102006033834 A1 [0004]
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008020637A DE102008020637A1 (en) | 2008-04-24 | 2008-04-24 | Hot water supply system comprises a hot water tank, in which the hot water is heated with a heat generator at a predetermined temperature, and a circulation line, into which the hot water is pumped with a circulating pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008020637A DE102008020637A1 (en) | 2008-04-24 | 2008-04-24 | Hot water supply system comprises a hot water tank, in which the hot water is heated with a heat generator at a predetermined temperature, and a circulation line, into which the hot water is pumped with a circulating pump |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102008020637A1 true DE102008020637A1 (en) | 2009-10-29 |
Family
ID=41111749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102008020637A Pending DE102008020637A1 (en) | 2008-04-24 | 2008-04-24 | Hot water supply system comprises a hot water tank, in which the hot water is heated with a heat generator at a predetermined temperature, and a circulation line, into which the hot water is pumped with a circulating pump |
Country Status (1)
Country | Link |
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DE (1) | DE102008020637A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101957069A (en) * | 2010-04-30 | 2011-01-26 | 冼泰来 | Transcritical carbon dioxide solar water heater |
EP3569936A1 (en) * | 2018-05-17 | 2019-11-20 | Danfoss A/S | Domestic water re-heating |
EP3617601A1 (en) * | 2018-08-29 | 2020-03-04 | Stiebel Eltron GmbH & Co. KG | Hot water system, especially drinking water heating and drinking water line installations |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006033834A1 (en) | 2006-03-01 | 2008-01-24 | Dünnleder, Werner, Dipl.-Ing. | Heating system for drinking water has three-way valve in collection line connected to output line of reaction cavity to cold water line of charging pump |
-
2008
- 2008-04-24 DE DE102008020637A patent/DE102008020637A1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006033834A1 (en) | 2006-03-01 | 2008-01-24 | Dünnleder, Werner, Dipl.-Ing. | Heating system for drinking water has three-way valve in collection line connected to output line of reaction cavity to cold water line of charging pump |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101957069A (en) * | 2010-04-30 | 2011-01-26 | 冼泰来 | Transcritical carbon dioxide solar water heater |
EP3569936A1 (en) * | 2018-05-17 | 2019-11-20 | Danfoss A/S | Domestic water re-heating |
EP3617601A1 (en) * | 2018-08-29 | 2020-03-04 | Stiebel Eltron GmbH & Co. KG | Hot water system, especially drinking water heating and drinking water line installations |
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AT510289A4 (en) | HEATER |
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Effective date: 20140416 |
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