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EP3062027B1 - Heat storage system and method for its operation - Google Patents

Heat storage system and method for its operation Download PDF

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Publication number
EP3062027B1
EP3062027B1 EP16157242.5A EP16157242A EP3062027B1 EP 3062027 B1 EP3062027 B1 EP 3062027B1 EP 16157242 A EP16157242 A EP 16157242A EP 3062027 B1 EP3062027 B1 EP 3062027B1
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EP
European Patent Office
Prior art keywords
heat
circulation pump
storage system
outlet
hot water
Prior art date
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Active
Application number
EP16157242.5A
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German (de)
French (fr)
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EP3062027A1 (en
Inventor
Hans-Josef Spahn
Frank Salg
Tobias Lingk
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Vaillant GmbH
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Vaillant GmbH
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Publication of EP3062027A1 publication Critical patent/EP3062027A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • 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
    • F24D17/0026—Domestic hot-water supply systems with conventional heating means
    • F24D17/0031—Domestic hot-water supply systems with conventional heating means with accumulation of the heated 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/02—Photovoltaic energy
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/08—Electric heater
    • 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
    • F24D2220/02—Fluid distribution means
    • F24D2220/0235—Three-way-valves
    • 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
    • F24D2220/08—Storage tanks
    • 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
    • F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium

Definitions

  • the invention relates to a heat storage system with storage loading system for heating the heat accumulator.
  • the prior art is either an immersion heater mounted directly within a reservoir or the operation of an electrically driven compression heat pump. Both technical solutions are switched on at a power surplus or at a reduced electricity price.
  • the patent application EP 1 795 818 A1 relates to a process for hot water preparation with a heat generator and a stratified storage. At least one cold water supply pipe opens into its bottom area and at least one hot water supply pipe in its upper area.
  • the stratified charge accumulator is connected to a charging circuit with a charge pump guided via the heat generator.
  • the invention is based on the object to optimize the hot water.
  • the invention is characterized in that a control device automatically adjusts to the plant situation and / or optimizes the hot water preparation.
  • the object of the present invention is to provide an alternative to the prior art.
  • the heat storage system comprises a storage charging system, which is provided outside of a heat storage.
  • the instantaneous water heater can heat the hot water circulating between the instantaneous water heater and the heat storage and thus heat the heat accumulator.
  • hot water can be drawn from the circuit through an outlet, wherein the water heater can raise the hot water from the temperature of the heat storage to the desired water temperature.
  • FIG. 1 represents a heat storage system according to the invention.
  • a heat storage 5 heat is stored in a supply of hot water.
  • cold water in the lower region of a stratified storage heat storage device 5 is supplied.
  • hot water is removed and either fed to an outlet 10 or circulated through a circuit 11, wherein the hot water is heated by the powered by photovoltaic panels 4 water heater 3 and is funded by the circulation pump 2.
  • the spout 10 is in the example in FIG FIG. 1 connected via a valve 1 to the circuit.
  • the valve 1 is in this case a three-way valve that either shuts off the outlet 10 or blocks a return in the circuit 11 via the circulation pump 2. According to the invention, this three-way valve can also be adjusted continuously.
  • FIG. 2 illustrates the situation in which hot water is shown through the spout 10. The valve is switched so that the return of the circuit 11 is closed. The circulation pump 2 does not promote in this situation.
  • FIG. 3 represents the situation in which the photovoltaic module 4 energy is provided.
  • the valve 1 is switched so that the outlet 10 is locked and the hot water is circulated in the circuit 11 and is continuously heated by the water heater 3.
  • the heat accumulator 5 can as in FIG. 4 also be heated by a further heat source via a charging heat exchanger 6.
  • a charging heat exchanger 6 This is, for example, a heat pump or a solar collector.
  • FIG. 5 represents an embodiment of the invention, in which the heat accumulator is filled with a heat transfer medium, for example water or a PCM material.
  • a heat transfer medium for example water or a PCM material.
  • the hot water is heated by a hot water heat exchanger 7.
  • the inlet 9 is provided in the circuit 11 between the circulation pump 2 and the heat accumulator 5.
  • FIG. 6 It is shown that a bypass 8 is provided parallel to the circulation pump 2. This bypass can be switched by a bypass three-way valve. This results particularly advantageous in the use of a designed as a three-way mixer valve 1 the ability to provide larger volume flows at the outlet available
  • FIG. 7 represents a further alternative embodiment of the invention.
  • no valve 1 is used.
  • the volumetric flow flowing through the one-tenth volumetric flow is detected by means of a volume flow sensor 12 and it is thus detected whether hot water flows through the outlet 10. Accordingly, when no water flows and power from the photovoltaic module 4 is available, the water heater 3 is operated and the circulation pump 2 operated. This happens primarily when a photovoltaic surplus (or any other temporary power production) exists, or a favorable electricity price is offered by the energy supplier at specific or flexible times.
  • the invention thus relates to the combination of an electrically operated flow heater 3 and a circulation pump 2 for storage charge.
  • a storage charge the heat transfer medium leaving the storage 5 in the flow heater 3 is heated to either a maximum set temperature or at a defined volume flow.
  • a valve 1 for example a three-way change-over valve or mixer valve, is connected in one embodiment so that the water heated by the flow heater 3 is returned to the reservoir 5.
  • the circulation pump 2 thereby conveys the heat transfer medium from the heat storage 5 through the components described above again at a lower point in the heat storage 5.
  • the heat storage 5 should be as possible a stratified storage or have at least one Schichtlade .
  • valve 1 a simple branch of the outlet 10 may be provided.
  • This alternative takes advantage of the fact that the hot water anyway by a Faucet is passed, which also represents a valve. To see if hot water is being splashed, it is an alternative in FIG. 7 a volumetric flow sensor 12 is provided.
  • the advantage of the invention is that with the help of the water heater 3, a defined amount in the heat storage 5 can be heated.
  • this storage charging system enables the defined heat carrier reheating for a required temperature at the outlet. Due to the direct heating of the heat transfer medium can be dispensed with a heat exchanger. For applications in which a media separation is required (eg PCM memory, integration of a second heat source, etc.), one or more heat exchangers can be used in the memory.
  • the use of a designed as a three-way mixer valve 1 and an additional bypass 8 the possibility to provide larger volume flows at the same temperature at the outlet, FIG. 6 , Today, the pressure loss in a commercial water heater is very large.
  • the three-way mixing valve 1 a minimal sufficient volume flow in the flow heater 3 can now be heated to a maximum temperature and mixed with a second volume flow from the memory 5 so that the desired outlet temperature is reached.
  • Example of a possible application A hot water tank that is heated by a heat pump to a temperature level that is still efficiently achievable for the heat pump (eg 40 ° C). If now higher temperatures than the 40 ° C at the outlet needed, then the desired outlet temperature can be provided by means of the water heater.
  • the combination with photovoltaic panels 4 hereby enables economical operation when the photovoltaic current excess is used for the storage charging.

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  • 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)
  • Central Heating Systems (AREA)

Description

Die Erfindung betrifft einen Wärmespeichersystem mit Speicherladesystem zum Erwärmen des Wärmespeichers.The invention relates to a heat storage system with storage loading system for heating the heat accumulator.

Stand der Technik ist entweder ein Heizstab, der direkt innerhalb eines Speichers angebracht ist oder der Betrieb einer elektrisch betriebenen Kompressionswärmepumpe. Beide technischen Lösungen werden bei einem Strom-Überschuss oder bei einem vergünstigten Strompreis eingeschaltet.The prior art is either an immersion heater mounted directly within a reservoir or the operation of an electrically driven compression heat pump. Both technical solutions are switched on at a power surplus or at a reduced electricity price.

Die Patentanmeldungen FR 2 389 838 A2 und FR2398976A1 offenbaren eine Umwälzvorrichtung für sanitäres Warmwasser, bestehend aus einem Wasserumwälzkreis zur Rückleitung zum Generator. Es ist ein Speicherbehälter ausreichender Größe vorgesehen, der in den Umwälzkreis geschaltet ist, um Warmwasser sehr großer momentaner Durchsatzmengen für die gleichzeitige Versorgung mehrerer Zapfstellen liefern zu können.The patent applications FR 2 389 838 A2 and FR2398976A1 disclose a circulating device for sanitary hot water, consisting of a Wasserumwälzkreis for return to the generator. It is provided a storage tank of sufficient size, which is connected in the recirculation to provide hot water very large instantaneous flow rates for the simultaneous supply of multiple taps.

In der Patentanmeldung DE 26 41 601 A1 ist ein Gerät zur Heißwasserbereitung beschrieben. In einem Speicherbehälter mit einem untenliegenden Kaltwasserzulaufstutzen und einem obenliegenden Heißwasserentnahmestutzen steht mittels eines Heizkörpers erwärmtes Wasser zur Ableitung bereit. An dem Zulaufstutzen und dem Entnahmestutzen des Speicherbehälters ist je ein absperrbares Abzweigorgan vorgesehen. Der Heizkörper und eine vorgeschaltete Umwälzpumpe sind an die Abzweigorgane angeschlossen. Im Heizbetrieb wird aus dem Speicherbehälter mittels der Umwälzpumpe am Zulaufstutzen Wasser abgezogen, mittels des Heizkörpers erhitzt und dem Speicherbehälter über den Entnahmestutzen zugeführt.In the patent application DE 26 41 601 A1 is a device for hot water preparation described. In a storage container with an underlying cold water inlet nozzle and an overhead hot water outlet nozzle is heated by a radiator heated water for discharge. At the inlet nozzle and the sampling nozzle of the storage container per a shut-off branching device is provided. The radiator and an upstream circulating pump are connected to the branch organs. In heating operation, water is withdrawn from the storage tank by means of the circulation pump at the inlet connection, heated by means of the heating element and fed to the storage tank via the extraction connection.

Die Patentanmeldung EP 1 795 818 A1 betrifft ein Verfahren zur Warmwasserbereitung mit einem Wärmeerzeuger und einem Schichtladespeicher. In dessen Bodenbereich mündet mindestens ein Kaltwasserzuführrohr und in dessen oberen Bereich mindestens ein Warmwasserzuführrohr. Der Schichtladespeicher ist an einen über den Wärmeerzeuger geführten Ladekreis mit einer Ladepumpe angeschlossen. Der Erfindung liegt die Aufgabe zu Grunde, die Warmwasserbereitung zu optimieren. Gekennzeichnet ist die Erfindung dadurch, dass eine Regeleinrichtung sich automatisch auf die Anlagensituation einstellt und/oder die Warmwasserbereitung optimiert.The patent application EP 1 795 818 A1 relates to a process for hot water preparation with a heat generator and a stratified storage. At least one cold water supply pipe opens into its bottom area and at least one hot water supply pipe in its upper area. The stratified charge accumulator is connected to a charging circuit with a charge pump guided via the heat generator. The invention is based on the object to optimize the hot water. The invention is characterized in that a control device automatically adjusts to the plant situation and / or optimizes the hot water preparation.

Aufgabe der vorliegenden Erfindung ist es, eine Alternative zum Stand der Technik bereitzustellen.The object of the present invention is to provide an alternative to the prior art.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des unabhängigen Anspruchs gelöst. Dabei umfasst das Wärmespeichersystem ein Speicherladesystem, das außerhalb eines Wärmespeichers vorgesehen ist. Dabei kann einerseits der Durchlauferhitzer das zwischen Durchlauferhitzer und Wärmespeicher zirkulierende Warmwasser erhitzen und so den Wärmespeicher erwärmen. Andererseits kann durch einen Auslauf Warmwasser aus dem Kreislauf gezapft werden, wobei der Durchlauferhitzer das Warmwasser von der Temperatur des Wärmespeichers auf die gewünschte Wassertemperatur anheben kann. Vorteilhafte Weiterbildungen der Erfindung werden durch die abhängigen Ansprüche geschützt. Ein Verfahrensanspruch beschreibt das Verfahren zum Betreiben des erfindungsgemäßen Wärmespeichersystems.This object is achieved by the features of the independent claim. In this case, the heat storage system comprises a storage charging system, which is provided outside of a heat storage. On the one hand, the instantaneous water heater can heat the hot water circulating between the instantaneous water heater and the heat storage and thus heat the heat accumulator. On the other hand, hot water can be drawn from the circuit through an outlet, wherein the water heater can raise the hot water from the temperature of the heat storage to the desired water temperature. Advantageous developments of the invention are protected by the dependent claims. A method claim describes the method for operating the heat storage system according to the invention.

In den Figuren 1 bis 7 wird das erfindungsgemäße Wärmespeichersystem beschrieben. Figur 1 stellt ein erfindungsgemäßes Wärmespeichersystem dar. In einem Wärmespeicher 5 wird Wärme in einem Vorrat an Warmwasser gespeichert. Durch einen Eintritt 9 wird kaltes Wasser im unteren Bereich des eines Schichtenspeicher ausgeführten Wärmespeichers 5 zugeführt. Im oberen Bereich wird Warmwasser entnommen und entweder einem Auslauf 10 zugeführt oder über einen Kreislauf 11 zirkuliert, wobei das Warmwasser durch den von Photovoltaik-Kollektoren 4 gespeisten Durchlauferhitzer 3 erhitzt wird und durch die Umwälzpumpe 2 gefördert wird. Der Auslauf 10 ist in dem Beispiel in Figur 1 über ein Ventil 1 an den Kreislauf angeschlossen. Das Ventil 1 ist in diesem Fall ein Dreiwegeventil, dass entweder den Auslauf 10 absperrt oder eine Rückführung im Kreislauf 11 über die Umwälzpumpe 2 sperrt. Erfindungsgemäß kann dieses Dreiwegeventil auch kontinuierlich verstellt werden.In the FIGS. 1 to 7 the heat storage system according to the invention will be described. FIG. 1 represents a heat storage system according to the invention. In a heat storage 5 heat is stored in a supply of hot water. Through an inlet 9 cold water in the lower region of a stratified storage heat storage device 5 is supplied. In the upper area hot water is removed and either fed to an outlet 10 or circulated through a circuit 11, wherein the hot water is heated by the powered by photovoltaic panels 4 water heater 3 and is funded by the circulation pump 2. The spout 10 is in the example in FIG FIG. 1 connected via a valve 1 to the circuit. The valve 1 is in this case a three-way valve that either shuts off the outlet 10 or blocks a return in the circuit 11 via the circulation pump 2. According to the invention, this three-way valve can also be adjusted continuously.

Figur 2 stellt die Situation dar, in der Warmwasser durch den Auslauf 10 gezeigt wird. Dabei ist das Ventil so geschaltet, dass der Rücklauf des Kreislaufs 11 verschlossen ist. Die Umwälzpumpe 2 fördert in dieser Situation nicht. FIG. 2 illustrates the situation in which hot water is shown through the spout 10. The valve is switched so that the return of the circuit 11 is closed. The circulation pump 2 does not promote in this situation.

Figur 3 stellt die Situation dar, in der vom Photovoltaik-Modul 4 Energie zur Verfügung gestellt wird. Dabei ist das Ventil 1 so geschaltet, dass der Auslauf 10 gesperrt ist und das Warmwasser im Kreislauf 11 zirkuliert wird und dabei kontinuierlich durch den Durchlauferhitzer 3 erwärmt wird. FIG. 3 represents the situation in which the photovoltaic module 4 energy is provided. In this case, the valve 1 is switched so that the outlet 10 is locked and the hot water is circulated in the circuit 11 and is continuously heated by the water heater 3.

Der Wärmespeicher 5 kann wie in Figur 4 dargestellt auch von einer weiteren Wärmequelle über einen Lade-Wärmetauscher 6 erwärmt werden. Dies ist beispielsweise eine Wärmepumpe oder ein Solarkollektor.The heat accumulator 5 can as in FIG. 4 also be heated by a further heat source via a charging heat exchanger 6. This is, for example, a heat pump or a solar collector.

Figur 5 stellt eine Ausführungsvariante der Erfindung dar, bei der der Wärmespeicher mit einem Wärmeträgermedium, beispielsweise Wasser oder ein PCM-Material gefüllt ist. In diesem Fall wird das Warmwasser über einen Warmwasser-Wärmetauscher 7 erwärmt. In diesem Fall ist der Eintritt 9 in dem Kreislauf 11 zwischen Umwälzpumpe 2 und dem Wärmespeicher 5 vorgesehen. FIG. 5 represents an embodiment of the invention, in which the heat accumulator is filled with a heat transfer medium, for example water or a PCM material. In this case, the hot water is heated by a hot water heat exchanger 7. In this case, the inlet 9 is provided in the circuit 11 between the circulation pump 2 and the heat accumulator 5.

In Figur 6 ist dargestellt, dass parallel zur Umwälzpumpe 2 ein Bypass 8 vorgesehen ist. Dieser Bypass kann durch ein Bypass-Dreiwegeventil geschaltet werden. Dadurch ergibt sich besonders vorteilhaft bei dem Einsatz eines als Drei-Wege-Mischer ausgeführten Ventils 1 die Möglichkeit, größere Volumenströme am Auslauf zur Verfügung zu stellenIn FIG. 6 It is shown that a bypass 8 is provided parallel to the circulation pump 2. This bypass can be switched by a bypass three-way valve. This results particularly advantageous in the use of a designed as a three-way mixer valve 1 the ability to provide larger volume flows at the outlet available

Figur 7 stellt eine weitere alternative Ausführungsform der Erfindung dar. Hier wird kein Ventil 1 eingesetzt. Stattdessen wird über einen Volumenstromsensor 12 der durch die zur Zehntel fließende Volumenstrom erfasst und so erkannt, ob Warmwasser durch den Auslauf 10 fließt. Entsprechend wird dann, wenn kein Wasser fließt und Strom vom Photovoltaik-Modul 4 zur Verfügung steht der Durchlauferhitzer 3 betrieben und die Umwälzpumpe 2 betrieben. Dies geschieht vorrangig wenn ein Photovoltaik-Überschuss (oder jede andere temporäre Stromproduktion) besteht, oder ein günstiger Strompreis zu bestimmten oder flexiblen Zeiten durch den Energieversorger angeboten wird. FIG. 7 represents a further alternative embodiment of the invention. Here, no valve 1 is used. Instead, the volumetric flow flowing through the one-tenth volumetric flow is detected by means of a volume flow sensor 12 and it is thus detected whether hot water flows through the outlet 10. Accordingly, when no water flows and power from the photovoltaic module 4 is available, the water heater 3 is operated and the circulation pump 2 operated. This happens primarily when a photovoltaic surplus (or any other temporary power production) exists, or a favorable electricity price is offered by the energy supplier at specific or flexible times.

Gegenstand der Erfindung also ist die Kombination eines elektrisch betriebenen Durchlauferhitzers 3 und einer Umwälzpumpe 2 zur Speicherladung. Dabei wird bei einer Speicherladung, das aus dem Speicher 5 austretende Wärmeträgermedium im Durchlauferhitzer 3 auf entweder eine maximal eingestellte Temperatur, oder bei einem definierten Volumenstrom erwärmt. Des Weiteren besteht die Möglichkeit einer variablen Austrittstemperatur in Abhängigkeit der Speichertemperatur. Ein Ventil 1, beispielsweise ein Dreiwege-Umschaltventil oder Mischerventil, ist dabei in einer Ausführungsvariante so geschaltet, dass das durch den Durchlauferhitzer 3 erwärmte Wasser wieder in den Speicher 5 zurückgeführt wird. Die Umwälzpumpe 2 fördert dabei das Wärmeträgermedium aus dem Wärmespeicher 5 durch die zuvor beschriebenen Komponenten wieder an einer tieferen Stelle in den Wärmespeicher 5. Der Wärmespeicher 5 sollte dabei möglichst ein Schichtladespeicher sein oder zumindest ein Schichtladeverhalten aufweisen. Anstelle des Ventils 1 kann auch ein einfacher Abzweig des Auslaufs 10 vorgesehen sein. Diese Alternative macht sich die Tatsache zu Nutze, dass das Warmwasser ohnehin durch einen Wasserhahn geleitet wird, der ebenfalls ein Ventil darstellt. Um zu erkennen, ob Warmwasser geklatscht wird, ist es einer Alternative in Figur 7 ein Volumenstromsensor 12 vorgesehen.The invention thus relates to the combination of an electrically operated flow heater 3 and a circulation pump 2 for storage charge. In the case of a storage charge, the heat transfer medium leaving the storage 5 in the flow heater 3 is heated to either a maximum set temperature or at a defined volume flow. Furthermore, there is the possibility of a variable outlet temperature depending on the storage temperature. A valve 1, for example a three-way change-over valve or mixer valve, is connected in one embodiment so that the water heated by the flow heater 3 is returned to the reservoir 5. The circulation pump 2 thereby conveys the heat transfer medium from the heat storage 5 through the components described above again at a lower point in the heat storage 5. The heat storage 5 should be as possible a stratified storage or have at least one Schichtladeverhalten. Instead of the valve 1, a simple branch of the outlet 10 may be provided. This alternative takes advantage of the fact that the hot water anyway by a Faucet is passed, which also represents a valve. To see if hot water is being splashed, it is an alternative in FIG. 7 a volumetric flow sensor 12 is provided.

Der Vorteil der Erfindung besteht darin, dass mithilfe des Durchlauferhitzers 3 eine definierte Menge im Wärmespeicher 5 erwärmt werden kann. Zudem ermöglicht dieses Speicherladesystem die definierte Wärmeträgernacherwärmung für eine geforderte Temperatur am Auslauf. Durch die direkte Erwärmung des Wärmeträgermediums kann auf einen Wärmeübertrager verzichtet werden. Für Anwendungen bei denen eine Medientrennung erforderlich ist, (z.B. PCM Speicher, Einbindung einer zweiten Wärmequelle, o.ä.) kann ein oder mehrere Wärmeübertrager im Speicher eingesetzt werden. Zusätzlich ergibt sich durch den Einsatz eines als Drei-Wege-Mischer ausgeführten Ventils 1 und eines zusätzlichen Bypasses 8, die Möglichkeit größere Volumenströme bei gleicher Temperatur am Auslauf zur Verfügung zu stellen, Figur 6. Dabei ist heute der Druckverlust in einem handelsüblichen Durchlauferhitzer sehr groß. Mithilfe des Dreiwege-Mischventils 1 kann nun ein minimal ausreichender Volumenstrom im Durchlauferhitzer 3 auf eine maximale Temperatur erhitzt werden und mit einem zweiten Volumenstrom aus dem Speicher 5 so gemischt werden, das die gewünschte Auslauftemperatur erreicht wird.The advantage of the invention is that with the help of the water heater 3, a defined amount in the heat storage 5 can be heated. In addition, this storage charging system enables the defined heat carrier reheating for a required temperature at the outlet. Due to the direct heating of the heat transfer medium can be dispensed with a heat exchanger. For applications in which a media separation is required (eg PCM memory, integration of a second heat source, etc.), one or more heat exchangers can be used in the memory. In addition, the use of a designed as a three-way mixer valve 1 and an additional bypass 8, the possibility to provide larger volume flows at the same temperature at the outlet, FIG. 6 , Today, the pressure loss in a commercial water heater is very large. By means of the three-way mixing valve 1, a minimal sufficient volume flow in the flow heater 3 can now be heated to a maximum temperature and mixed with a second volume flow from the memory 5 so that the desired outlet temperature is reached.

Beispiel für eine mögliche Anwendung: Ein Warmwasserspeicher, der durch eine Wärmepumpe auf ein für die Wärmepumpe noch effizient erreichbares Temperaturniveau (z.B. 40°C) erhitzt wird. Werden nun höhere Temperaturen als die 40°C am Auslauf benötigt, so kann mittels des Durchlauferhitzers die gewünschte Auslauftemperatur bereitgestellt werden. Die Kombination mit Photovoltaik-Kollektoren 4 ermöglicht hierbei einen wirtschaftlichen Betrieb, wenn der Photovoltaikstrom-Überschuss für die Speicheraufladung verwendet wird.Example of a possible application: A hot water tank that is heated by a heat pump to a temperature level that is still efficiently achievable for the heat pump (eg 40 ° C). If now higher temperatures than the 40 ° C at the outlet needed, then the desired outlet temperature can be provided by means of the water heater. The combination with photovoltaic panels 4 hereby enables economical operation when the photovoltaic current excess is used for the storage charging.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
VentilValve
22
Umwälzpumpecirculating pump
33
DurchlauferhitzerHeater
44
Photovoltaik-KollektorPhotovoltaic collector
55
Wärmespeicherheat storage
66
Lade-WärmetauscherCharging heat exchanger
77
Warmwasser-WärmetauscherHot water heat exchanger
88th
Bypassbypass
99
Eintrittentry
1010
Auslaufoutlet
1111
Kreislaufcirculation
1212
VolumenstromsensorFlow Sensor

Claims (11)

  1. Heat storage system for storing heat, comprising a heat accumulator (5), an inlet (9) for cold water and an outlet (10) for extraction of hot water, wherein the heat storage system comprises a storage charging system with an electrically operated flow heater (3) and a circulation pump (2), characterised in that the heat accumulator (5), the flow heater (3) and the circulation pump (2) are arranged behind each other in a closed hydraulic circuit (11) in the flow direction of the circulation pump (2), wherein the outlet (10) is arranged between the flow heater (3) and the circulation pump (2).
  2. Heat storage system according to claim 1, characterised in that the outlet (10) is connected to the circuit (11) by a three-way valve (1).
  3. Heat storage system according to claim 1, characterised in that the outlet (10) is directly connected to the circuit (11) and that the outlet (10) is connected to a volume flow sensor (12).
  4. Heat storage system according to any of claims 1 to 3, characterised in that the inlet (9) is directly connected to the circuit (11) between the circulation pump (2) and the heat accumulator (5).
  5. Heat storage system according to any of claims 1 to 3, characterised in that the inlet (9) is directly connected to the heat accumulator (5).
  6. Heat storage system according to any of claims 1 to 4, characterised in that the heat accumulator (5) contains a heat carrier medium and that the heat accumulator (5) comprises a hot water heat exchanger (7) for transferring heat from the heat carrier medium to the hot water.
  7. Heat storage system according to any of claims 1 to 5, characterised in that the heat accumulator (5) can directly store the heated hot water.
  8. Heat storage system according to any of the preceding claims, characterised in that the heat accumulator (5) comprises a load heat exchanger (6) for transferring heat from an external heat source to the heat accumulator (5).
  9. Heat storage system according to any of the preceding claims, characterised in that a bypass (8) with a bypass three-way valve is provided parallel to the circulation pump (2).
  10. Method for operating a heat storage system according to any of claims 1 to 9, characterised in that for extracting hot water through the outlet (10) the flow rate in the circuit (11) is reduced or stopped by the circulation pump, by reducing or stopping the flow rate of the circulation pump and/or at least partly closing the valve (1) in the direction of the circulation pump, and that for heating the heat accumulator (5) the flow heater (3) is operated and hot water is conveyed in the circuit (11) by the circulation pump (2).
  11. Method according to claim 10, wherein for extracting hot water through the outlet (10) the flow rate in the circuit (11) is stopped by the circulation pump, a bypass (8) provided parallel to the circulation pump is opened and the valve (1) configured as a three-way mixer is operated, when the flow heater (3) is operated, in a way that a desired outlet temperature is reached at the outlet (10) for a sufficient flow rate.
EP16157242.5A 2015-02-25 2016-02-25 Heat storage system and method for its operation Active EP3062027B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015203359 2015-02-25

Publications (2)

Publication Number Publication Date
EP3062027A1 EP3062027A1 (en) 2016-08-31
EP3062027B1 true EP3062027B1 (en) 2018-06-06

Family

ID=55524098

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Application Number Title Priority Date Filing Date
EP16157242.5A Active EP3062027B1 (en) 2015-02-25 2016-02-25 Heat storage system and method for its operation

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Country Link
EP (1) EP3062027B1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2398976A1 (en) * 1977-07-25 1979-02-23 Saunier Duval Domestic hot water system - has instantaneous heater and hot water cylinder mounted in parallel to supply heavy flows together

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641601B2 (en) * 1976-09-16 1979-11-15 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Water storage heater
FR2389838A2 (en) * 1977-05-04 1978-12-01 Saunier Duval Domestic hot water circulator - has branch circuit with circulation pump and storage tank of sufficient capacity to supply several taps simultaneously
DE8310135U1 (en) * 1983-04-07 1983-08-11 Nova-Apparatebau GmbH + Co, 7710 Donaueschingen HOT WATER LAYER STORAGE
DE102005058570B3 (en) * 2005-12-08 2007-05-24 Robert Bosch Gmbh Method for controlling water heater and hot water tank with a control circuit to monitor the effect of the heater to optimize the heating to match the hot water demands
DE102007033564B3 (en) * 2007-07-19 2009-01-02 Robert Bosch Gmbh Method for operating a stratified charge storage and domestic hot water system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2398976A1 (en) * 1977-07-25 1979-02-23 Saunier Duval Domestic hot water system - has instantaneous heater and hot water cylinder mounted in parallel to supply heavy flows together

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