Combined hot water and heating storage tank

Abstract

Combined hot water and heating storage tank (21) for heating drinking water and for heating heating water for heating a building in conjunction with a heat pump, comprising - a heating storage part (2), - a hot water storage part (1), wherein both storage parts (1, 2) each have a storage space for storing heating water tempered by the heat pump, wherein the storage spaces of the two storage parts (1, 2) are hydraulically separated from each other, wherein the storage parts (1, 2) each have a flow connection (9, 12) for connecting the respective storage space to a flow of the heat pump and each have a return connection (10, 13) for connecting the respective storage space to a return of the heat pump, wherein the heating storage part (2) has a heating circuit flow connection (11) for connecting the storage space of the heating storage part (2) to a flow of a heating distribution system of the building and a heating circuit return connection (14, 16) for connecting the storage space of the heating storage part (2) to a return of the heating distribution system of the building, wherein the hot water storage part (1) and the heating storage part (2) are arranged next to each other and connected to each other as a structural unit, wherein a thermal intermediate insulation (7) is arranged between the two storage parts (1, 2), which thermally insulates the two storage parts (1, 2) from each other, wherein both storage parts (1, 2) are enclosed by a common thermal external insulation (6) which thermally insulates the two storage parts (1, 2) from the environment, wherein a heat exchanger (4) is arranged in the storage space of the hot water storage part (1) and a heat exchanger (3) is arranged in the storage space of the heating storage part (2), each of which is provided and arranged for heating the drinking water, wherein the heat exchanger of the heating storage part (3) has a cold water connection (15) for supplying untempered drinking water and the heat exchanger of the hot water storage part (4) has a hot water connection (8) for discharging heated drinking water, wherein the two heat exchangers (3, 4) are hydraulically connected to one another and connected in series, so that untempered drinking water, starting from the cold water connection (15), first flows through the heat exchanger of the heating storage part (3) and can be heated by the heating water located in the storage space of the heating storage part (2), the drinking water heated in this way then flows from the heat exchanger of the heating storage part (3) into the heat exchanger of the hot water storage part (4), flows through this in the direction of the hot water connection (8) and can be further heated by the heating water located in the storage space of the hot water storage part (1), and the heated drinking water can exit the heat exchanger of the hot water storage part (4) at the hot water connection (8).

Description

[0001] The present application relates to a combined hot water and heating storage tank according to claim 1. The combined hot water and heating storage tank is used for hot water preparation and heating of buildings in conjunction with a heating device, for example and preferably with at least one heat pump.

[0002] Heat pumps for space heating in buildings and for heating drinking water are significantly more efficient the lower the flow temperature provided by the heat pump. Therefore, the goal with heat pumps is always to operate at low flow temperatures for as much of their operating time as possible.

[0003] Heat pumps typically supply the building with hot drinking water, for example for showering, and with hot heating water to meet the heating demand, i.e. for space heating. The temperatures required to provide hot drinking water are generally significantly higher than the temperatures of the heating water for space heating. The heat pump regularly switches between "hot water" and "heating" operating modes as required. Switching between charging the storage tank with hot heating water for heating drinking water or with hot heating water for space heating is achieved, for example, by means of a reversing valve or two circulation pumps in the heat pump's flow line.

[0004] The heating circuit(s) of the respective heating distribution system (e.g. a static heating circuit with radiators and / or a heating circuit with underfloor heating) are usually supplied with one or more additional circulation pumps (heating circuit pumps), which pump the heating water from the respective heating storage tank into a heating distribution system, which has corresponding pipes for sub-distribution to the respective heating devices (radiators or underfloor heating).

[0005] The majority of the annual heating work in normal residential buildings is used for space heating (about 75%), so that the heat pump can be operated at the lower temperatures for space heating in most operating conditions. State of the art

[0006] In conjunction with heat pumps, two types of storage solutions are usually installed:

[0007] Option 1: separate hot water and heating storage tanks. This option requires two storage tanks to be installed: i) A hot water storage tank for the provision of hot drinking water, which is usually operated at 50°C to 60°C. ii) A storage tank for space heating, which is usually operated at lower temperatures of 30°C to 50°C (depending on the heat distribution system, i.e., radiators or underfloor heating). Storage tanks are primarily used to ensure the minimum running time of heat pumps when, during heating operation, the heat pump's flow rate is higher than the flow rate drawn from the heating circuit. The excess heat energy is then temporarily stored in the storage tank. Storage tanks are also used to temporarily store heat energy, for example, when the heat pump is operated with inexpensive electricity from the home's photovoltaic system.

[0008] Disadvantages of installing two separate storage tanks are increased space requirements due to the larger installation area and increased heat loss due to the overall larger external surface of the two storage tanks.

[0009] Variant 2: Layered storage. Another common storage solution is the so-called layered storage, also called a "layered storage." With layered storage, only one common storage tank is used for heating the drinking water and for space heating. Due to the smaller outer surface, heat losses are lower than with the previously described variant 1. Likewise, the overall space requirement is smaller, although the layered storage tank itself is larger than a single hot water tank or a single heating tank from variant 1.

[0010] The entire stratified storage tank is filled with heating water. The drinking water is heated either by an internal heat exchanger (e.g., and preferably made of stainless steel), through which the drinking water flows, or by an external heat exchanger. An internal heat exchanger is typically formed by a helical tube body inserted into a storage chamber of the stratified storage tank and surrounded by the heating water, allowing thermal energy to be exchanged through a tube wall of the heat exchanger with the drinking water flowing within the heat exchanger.

[0011] The upper section of a stratified storage tank is used exclusively for heating drinking water, while the lower section is used for space heating and preheating drinking water. The upper section of the stratified storage tank is charged by the heat pump with higher temperatures (e.g., 50°C to 60°C), while the lower section is charged with lower temperatures (e.g., 30°C to 50°C). Due to the temperature-dependent density of the water and gravity, this temperature stratification is maintained for a certain period of time.

[0012] However, thermal stratification is counteracted by heat conduction, entraining currents, and kinetic energy during charging. This repeatedly leads to partial mixing of the temperatures in the stratified storage tank, causing the upper part of the stratified storage tank to cool down and thus require more frequent recharging by the heat pump at higher temperatures. The resulting increase in the proportion of high temperatures in the heat pump's total heating work thus reduces the heat pump's efficiency.

[0013] A circulation system for the hot drinking water, which is present in many homes via a circulation pipe system and ensures that the hot drinking water is quickly available at the taps, can also ensure that the upper part of the stratified storage tank cools down significantly faster. This is especially the case if the drinking water circulating through the heat exchanger first flows through the lower, cooler section of the stratified storage tank and then through the upper, warmer section.

[0014] The maximum stratification efficiency achievable on test benches with very good stratified storage tanks is between 80% and 90%. In practical operation, however, the stratification efficiency is often significantly lower due to changing volume flows. A stratification efficiency of 100% describes perfect temperature stratification of the heating water in the storage tank without any disruptions, while a stratification efficiency of 0% describes complete mixing of the storage tank. One advantage of a stratified storage tank with an internal heat exchanger is that the lower section of the stratified storage tank, which is intended for room heating, can preheat the drinking water as the drinking water flows through the heat exchanger from bottom to top. In this case, a cold water connection is provided at one end of the stratified storage tank and a hot water connection at the top.

[0015] Both of the storage solutions mentioned, which are common today for operation with heat pumps, have their own advantages and disadvantages.

[0016] A further disadvantage of both variants arises from the hydraulic integration of heating storage tanks or stratified storage tanks as separate storage tanks. Heating storage tanks and stratified storage tanks are very often installed in conjunction with heat pumps for heating as so-called "separated storage tanks." This hydraulic integration describes the heat pump using a separate flow connection for the warmer flow of the heat pump in the upper section of the heating storage tank (in the middle section for stratified storage tanks) and a separate return connection for the cooler return of the heat pump in the lower section of the heating storage tank or stratified storage tank to charge the respective storage tank.

[0017] The heating distribution system, which draws heat energy from the respective storage tank to supply radiators, for example, also uses its own heating circuit flow connection, which is located in the upper area in normal heating storage tanks and in the middle area in stratified storage tanks. Each storage tank also has its own heating circuit return connection in the lower area of ​​the storage tank. In heat pumps, for example, the heating circuit flow is approx. 5 K to 10 K warmer than the heating circuit return. Integration as a separate storage tank is advantageous because the volume flow of the heat pump for supplying heat to the storage tank and the volume flow of the heating distribution system for extracting heat energy for space heating can sometimes fluctuate greatly and differ from one another. Both volume flows are pumped using their own circulation pumps. This means that even within a heating storage tank orin the lower area of ​​a stratified storage tank, there is a mixing of temperatures, namely in this described case not between the area for heating the drinking water and the area for space heating, but due to the different flow and return temperatures of the heating distribution system only in the heating storage tank or in the lower area of ​​the stratified storage tank.

[0018] If the heat pump loads the storage tank with a flow temperature of 40°C, for example, the mixing may result in the heating distribution system only being supplied with a flow temperature of 38°C, which in turn means a loss of efficiency for the heat pump. Task

[0019] The present invention is therefore based on the object of providing a hot water and heating storage tank which, in conjunction with a heating device designed as a heat pump, avoids the disadvantages of the known variants which have a negative effect on the efficiency of the heat pump. Solution

[0020] The underlying problem is solved by means of a combined hot water and heating storage tank with the features of claim 1. Advantageous embodiments emerge from the subclaims as well as the description and the exemplary embodiment.

[0021] The hot water and heating storage tank according to the invention comprises a heating storage part and a hot water storage part. Both storage parts each have a storage chamber for storing heating water that has been tempered by the heat pump. The storage parts can, for example, each be formed by steel containers, whereby both storage parts can be of the same size or different sizes. Preferably, both storage parts can be rotationally symmetrical and have at least substantially the same diameter.

[0022] The storage chambers provided by the storage units, each of which can hold a volume of heating water, are hydraulically separated from each other. This prevents mixing of the heating water volumes stored in the storage chambers of the storage units.

[0023] The two storage tank sections each have a flow connection for connecting the respective storage chamber to a flow of the heat pump and each have a return connection for connecting the respective storage chamber to a return of the heat pump. The respective flow connections are connected to each other via a switching valve, which can switch between heating and hot water preparation modes; the shared flow is connected to the heat pump. The return connections of the two storage tank sections are directly connected to each other, so that there is only one common return connection for the heat pump. The corresponding pipes and fittings are installed in the space between the two storage tank sections within the thermal insulation to minimize heat loss to the outside. To provide different temperatures, the flow connections can interact with different flow lines of the heat pump.However, the flow connections can also be connected to the same flow of the heat pump. The same applies to the return connections.

[0024] The heating storage unit has a heating circuit flow connection for connecting the storage space of the heating storage unit to a flow of a building's heating distribution system, and a heating circuit return connection for connecting the storage space of the heating storage unit to a return of the building's heating distribution system. The heating storage unit thus serves to heat the space. In other words, the heating storage unit supplies the heating distribution system with heated heating water. The temperature of the heating water in the storage space of the heating storage unit is generally lower than in the hot water storage unit, for example, in the range between 30°C and 50°C. In the storage space of the hot water storage unit, the temperature of the heating water is, for example, and preferably, between 50°C and 60°C.

[0025] The hot water storage section and the heating storage section are arranged side by side and connected to each other as a single structural unit. For example, and preferably, the two storage sections can be mechanically firmly screwed, welded, or glued together, or a combination thereof. The heating storage section is preferably connected to the hot water storage section by means of connecting brackets that can be removed for installation into the building. Both storage sections can, for example, and preferably, interact with feet, by means of which both storage sections can be placed on a surface.

[0026] A thermal intermediate insulation layer is preferably arranged between the two storage sections, thermally isolating them from each other. This intermediate insulation layer can, for example, and preferably, be known thermal insulation used for insulating water storage tanks. The intermediate insulation reduces the exchange of thermal energy between the two storage sections.

[0027] In addition, both storage sections are enclosed by a common thermal outer insulation, which thermally insulates them from the surroundings. This reduces the loss of heat energy to the environment or to the outside. The outer insulation can be made of known thermal insulation that is commonly used for insulating water storage tanks. In particular, the intermediate insulation and the outer insulation can be made of the same material.

[0028] A heat exchanger is arranged in the storage space of the hot water storage section, and a heat exchanger is arranged in the storage space of the heating storage section. The two heat exchangers are each made, for example, and preferably, of stainless steel or copper. For example, the heat exchangers can each be designed in the form of a coiled pipe. The heat exchangers are each provided and configured for heating the drinking water. In particular, thermal energy from the heating water can pass through a wall (in particular a pipe wall) of the respective heat exchanger into the drinking water conveyed within the heat exchanger, thereby gradually heating the drinking water as it flows through the heat exchangers.

[0029] The heat exchanger of the heating storage section has a cold water connection for supplying untempered drinking water, and the heat exchanger of the hot water storage section has a hot water connection for discharging heated drinking water. The two heat exchangers are hydraulically connected and fluidically connected in series, so that untempered drinking water, starting from the cold water connection, first flows through the heat exchanger of the heating storage section and can be heated by the heating water in the storage space of the heating storage section. The (pre-)heated drinking water can then flow from the heat exchanger of the heating storage section into the heat exchanger of the hot water storage section and through this towards the hot water connection. The drinking water is further heated by the heating water in the storage space of the hot water storage section.Finally, the (fully) heated drinking water can exit the heat exchanger of the hot water storage unit at the hot water connection.

[0030] The combined hot water and heating storage tank specified in claim 1 has many advantages. In particular, compared to separate installation of the storage tanks, it utilizes the advantage of a somewhat smaller storage shell (low heat loss and smaller footprint) while maintaining complete thermal separation of both temperature zones, i.e., the two storage components (drinking water heating in the hot water storage section and heating water extraction for space heating in the heating storage section). There is no mixing of the volumes of heating water stored in the storage spaces of the two storage sections, and therefore no associated efficiency losses.In addition, the drinking water is preheated as it flows through the heat exchanger in the heating storage section, reducing the proportion of the high temperatures required by the hot water storage section to heat the drinking water to a desired final temperature (e.g., 50°C) in the heat pump's overall heating work. The invention allows the heat pump to operate significantly more efficiently and thus consumes less electricity overall.

[0031] In an advantageous embodiment, the combined hot water and heating storage tank comprises an overflow chamber by means of which the flow connection of the heating storage tank section and the heating circuit flow connection are directly connected to each other in terms of flow technology. The overflow chamber thus allows the heating water to flow directly from the heat pump flow into the heating circuit flow without first having to enter the storage space of the heating storage tank. The overflow chamber is arranged in the storage space of the heating storage tank section and encloses the flow connection of the heating storage tank section and the heating circuit flow connection. In the upper area, the overflow chamber has an opening through which both heating water can flow into the storage space of the heating storage tank section and heating water can flow from the storage space of the heating storage tank section into the overflow chamber.In other words, it is possible to both introduce water from the heat pump's flow line through the opening in the upper area of ​​the overflow chamber into the storage space of the heating storage section, thereby "charging" it (with thermal energy), and to extract thermal energy from the heating storage section, with the heating water flowing through the opening in the upper area of ​​the overflow chamber to the heating circuit flow connection. Consequently, the overflow chamber allows different volume flows to flow from the flow connection of the heating storage section to the heating circuit flow connection on the one hand, and from the flow connection into the storage space of the heating storage section on the other.

[0032] This design has the advantage that the flow temperature generated by the heat pump can always flow directly into the heating circuit flow without temperature mixing whenever the volume flow of heated heating water provided by the heat pump (i.e., the volume flow in the heat pump circuit) is greater than the volume flow in the heating circuit, which corresponds to the majority of operating conditions during the heating season. In this context, there are two operating conditions during the heating season. 1. Operating condition: the heat pump is in operation; warm flow water flows directly into the heating circuit flow, and any excess flow flows through the opening in the upper area of ​​the overflow chamber into the heating storage section. 2.Operating mode: The heat pump is not in operation. In this case, the heating circuit is supplied only with the stored heat from the heating storage unit. The heating water is supplied to the heating circuit via the opening in the upper area of ​​the overflow chamber. The invention allows the heat pump to operate more efficiently, thus consuming significantly less electricity.

[0033] Furthermore, a design of the combined hot water and heating storage tank may be advantageous in which it has a circulation connection for connection to a circulation pipe system of the building. The circulation connection is arranged on a connecting line between the heat exchanger of the hot water storage part and the heat exchanger of the heating storage part and is hydraulically connected to both heat exchangers. For example, and preferably, the circulation connection can be arranged in the area of ​​the intermediate insulation between the two storage parts, with the connecting line between the two heat exchangers extending through the intermediate insulation to hydraulically connect the two heat exchangers to each other.The arrangement of the circulation connection has the advantage that the recirculated drinking water, which is still at a relatively high temperature, can be fed directly into the heat exchanger in the hot water storage section, bypassing the heat exchanger in the heating storage section. This prevents an indirect exchange of heat energy between the two storage sections, which would otherwise occur due to the drinking water circulating in the circulation system. In other words, the position of the connection prevents the recirculated drinking water, which is still at a relatively high temperature, from initially cooling in the heat exchanger of the heating storage section due to the lower storage temperature, which then further cools the hot water storage section. Examples of implementation

[0034] The invention is explained in more detail below using an exemplary embodiment illustrated in the figures. It shows: Fig. 1: Sectional drawing of the combined hot water and heating storage tank from the side (with the connections facing forward), Fig. 2: Section of the combined hot water and heating tank from above.

[0035] The exemplary embodiment comprises a combined hot water and heating storage tank 21. This comprises two storage tank sections 1, 2, namely a hot water storage tank section 1 and a heating storage tank section 2. The two storage tank sections 1, 2 are arranged side by side, with the hot water storage tank section 1 being connected to the heating storage tank section 2 by means of connecting brackets 19. Both storage tank sections 1, 2 are mounted on a base using feet or a base ring. When the hot water and heating storage tank 21 is in operation, both storage tank sections 1, 2 are filled with heating water.

[0036] The hot water storage part 1 has a flow connection 9 for connecting the hot water storage part 1 or its storage chamber to a flow of a heat pump (not shown in the figures). The flow connection 9 is located in an upper area of ​​the hot water storage part 1. Furthermore, the hot water storage part 1 has a corresponding return connection 10, which is located in a lower area of ​​the hot water storage part 1. Heating water is circulated back to the heat pump via the return connection 10. In other words, the storage chamber of the hot water storage part 1 is connected to a return of the heat pump via the return connection 10. Analogously, the heating storage part 2 also has a flow connection 12 for a flow of the heat pump and a return connection 13 for the return of the heat pump.

[0037] Both storage parts 1, 2 are also each equipped with a vent 17, 18.

[0038] Heating storage section 2 supplies at least one heating circuit (e.g., two heating circuits, one for radiators and one for underfloor heating) and is used to preheat the drinking water. It is typically charged by the heat pump at a low temperature (e.g., 30°C to 50°C). Hot water storage section 1 is used to heat the drinking water and is typically charged by the heat pump at higher temperatures (e.g., 50°C to 60°C).

[0039] However, unlike stratified storage tanks, which consist of a single container, both storage tank sections 1 and 2 are not directly connected via the heating water, but are hydraulically separated from each other. In other words, there is no direct hydraulic connection between the storage chambers of the two storage tank sections 1 and 2, in which the heating water is stored. Mixing of the volumes of heating water stored in the storage chambers of the storage tank sections 1 and 2 is thus prevented. In other words, there is no mixing of the water masses between the hot water storage tank section 1 and the heating storage tank section 2.

[0040] An intermediate insulation 7 is installed between the storage parts 1, 2 so that the effect of heat transfer between the two storage parts 1, 2 by heat conduction is also minimized.

[0041] To heat the drinking water, a heat exchanger 3, 4 is arranged in each of the two storage sections 1, 2. The heat exchangers 3, 4 are here and preferably at least substantially identical in construction. The heat exchangers 3, 4 are each made of stainless steel, in this case each formed by a stainless steel corrugated pipe. In other words, the heat exchangers 3, 4 each comprise a stainless steel pipe laid in a coil. The heat exchangers 3, 4 are arranged in the storage chambers of the storage sections 1, 2 in such a way that they are surrounded by the heating water stored therein.

[0042] The cold drinking water first flows through a cold water connection 15 into the heat exchanger of the heating storage part 3, where it is preheated as it flows through the heat exchanger of the heating storage part 3. Thermal energy from the heating water, which is stored in the storage space of the heating storage part 2, is transferred through a pipe wall of the heat exchanger of the heating storage part 3 to the drinking water flowing through the heat exchanger 3.

[0043] The preheated drinking water then flows through a connecting line from the heat exchanger of the heating storage section 3 to the heat exchanger of the hot water storage section 4, which is located in the hot water storage section 1. The heat exchanger in the hot water storage section 4 reheats the drinking water to its final temperature due to the higher temperature of the heating water in the hot water storage section 1. The heated drinking water can then be drawn off from a hot water connection 8 and supplied to the taps of the respective building. Preheating in the heating storage section 2 reduces the amount of heat required for the hot water storage section 1 with the higher temperatures.

[0044] Both storage tank sections 1, 2 arranged side by side are protected against heat loss to the outside by means of a shared external insulation 6. The installation area of ​​the combined hot water and heating storage tank 21 is somewhat smaller than with separate installation of two separate storage tanks, and heat losses are also lower due to the smaller surface area. The connecting lines of the heat exchangers 3, 4, the connecting lines of the flow and return lines, and the necessary fittings such as the hot water and heating changeover valve 22 and corresponding shut-off valves 23, 24 can be installed within the external insulation 6 in the space between the two storage tank sections 1, 2, so that fewer connections need to be led to the outside through the external insulation 6. This reduces heat loss overall, since the connecting lines and fittings are usually installed outside the storage tank shell.

[0045] The combined hot water and heating storage tank 21 preferably has an overflow chamber 5 in the heating storage tank section 2, which is used to supply heating water to at least one heating circuit. This overflow chamber 5 is installed in such a way that it extends through the storage space of the heating storage tank section 2. During heating operation, the overflow chamber 5 ensures that the flow temperature of the heat pump can flow via the heat pump flow connection 25, with the changeover valve 22 in the appropriate position, via the flow connection 12 of the heating storage tank section 2 directly into a heating circuit flow connection 11 for a heating distribution system of the heating circuit.

[0046] The overflow chamber 5 is closed at the sides and bottom; the upper cover of the overflow chamber 5 has at least one opening. The heating water flows from the heat pump into the overflow chamber 5 via the flow connection of the heating storage unit 12. Heating water from the overflow chamber 5 is supplied to the heating circuit via the heating circuit flow connection 11.

[0047] If a volume flow of the heating water originating from the heat pump and supplying the heating storage part 2 with thermal energy through the flow connection of the heating storage part 12 is not identical to a volume flow of the heating water entering the at least one heating circuit through the heating circuit flow connection 11 and thus extracting thermal energy from the heating storage part 2, the difference in the volume flows can be compensated for through the at least one opening in the upper region of the overflow chamber 5. In most operating states, the volume flow originating from the heat pump is greater than the volume flow supplied to the heating circuit - for example, driven by a heating circuit pump.The temperature produced by the heat pump, i.e. the portion of the volume flow of heated heating water provided by the heat pump that is used by the heating circuit, then flows unhindered through the overflow chamber 5 into the heating circuit flow connection 11. Any excess volume flow not used by the heating circuit flows into the upper area of ​​the storage space of the heating storage section, which consequently stores the excess thermal energy. The temperature thus reached in the heating circuit is higher than with the usual integration of a heating storage tank as a separate storage tank. This allows the flow temperature of the heat pump to be reduced. If the heat pump is not operating, the heating circuit is supplied with heat stored in the heating storage section 2, which then flows through the overflow chamber 5 from the upper storage space of the heating storage section 2 into the heating circuit flow connection 11.

[0048] In summer, i.e., outside of the heating season, only hot water storage section 1 is active, which minimizes heat loss. If the heat pump has a cooling function, the cold drinking water, which flows through the heat exchanger of heating storage section 3 even in summer, cools the heating water in heating storage section 2, thus naturally supporting the cooling function. Even in cooling mode, the drinking water is preheated from approximately 10°C to approximately 15°C, which reduces the heat demand for hot water in the summer months.

[0049] For the return of the heating distribution system, the heating storage part 2 has at least one heating circuit return connection 14, 16. In the example shown, two heating circuit return connections 14, 16 are present, which are formed at different heights on the heating storage part 2 to enable different hydraulic variants. For example, depending on the volume flow of the heating circuit, it may also be advantageous to integrate the heating circuit return not in the lower area of ​​the heating storage part 2, but in the middle area of ​​the heating storage part 2. Corresponding shut-off valves 23, 24 are provided for this purpose in order to be able to switch between the heating return connections 14, 16. The return of the heating circuit is connected to the heating circuit return connection 27, and the return of the heat pump is connected to the heat pump return connection 26.

[0050] In the example shown, a circulation system for circulating hot drinking water is installed in the house to which the combined hot water and heating storage tank 21 belongs. This circulation system is connected to the heat exchangers 3, 4 via a circulation connection 20. Here, the circulation connection 20 is preferably positioned on the connecting line that connects the heat exchanger of the heating storage tank section 3 and the heat exchanger of the hot water storage tank section 4. This ensures that the hot drinking water circulates only through the heat exchanger of the hot water storage tank section 4. This prevents the temperatures of the heating storage tank section 2 and the hot water storage tank section 1 from equalizing, even if a circulation system for the drinking water is present. List of reference symbols 1 hot water storage unit 2 heating storage part 3 Heat exchanger of the heating storage part 4 heat exchangers of the hot water storage tank 5 Overflow chamber 6 External insulation 7 Intermediate insulation 8 Hot water connection 9 Flow connection of the hot water storage tank 10 Return connection of the hot water storage tank 11 Heating circuit flow connection 12 Flow connection of the heating storage part 13 Return connection of the heating storage part 14 Heating circuit return connection 15 Cold water connection 16 second heating circuit return connection 17 Venting the hot water storage tank 18 Venting the heating storage part 19 connecting consoles 20 Circulation connection 21 combined hot water and heating storage tank 22 Switching valve for hot water and heating operation 23 Shut-off valve heating circuit return connection 16 24 Shut-off valve heating circuit return connection 14 25 Heat pump flow connection 26 Return connection heat pump 27 Return connection heating circuit

Claims

[1] Combined hot water and heating storage tank (21) for heating drinking water and for heating heating water for heating a building in conjunction with a heat pump, comprising - a heating storage part (2), - a hot water storage part (1), wherein both storage parts (1, 2) each have a storage space for storing heating water tempered by the heat pump, wherein the storage spaces of the two storage parts (1, 2) are hydraulically separated from each other, wherein the storage parts (1, 2) each have a flow connection (9, 12) for connecting the respective storage space to a flow of the heat pump and each have a return connection (10, 13) for connecting the respective storage space to a return of the heat pump, wherein the heating storage part (2) has a heating circuit flow connection (11) for connecting the storage space of the heating storage part (2) to a flow of a heating distribution system of the building and a heating circuit return connection (14, 16) for connecting the storage space of the heating storage part (2) to a return of the heating distribution system of the building, wherein the hot water storage part (1) and the heating storage part (2) are arranged next to each other and connected to each other as a structural unit, wherein a thermal intermediate insulation (7) is arranged between the two storage parts (1, 2), which thermally insulates the two storage parts (1, 2) from each other, wherein both storage parts (1, 2) are enclosed by a common thermal external insulation (6) which thermally insulates the two storage parts (1, 2) from the environment, wherein a heat exchanger (4) is arranged in the storage space of the hot water storage part (1) and a heat exchanger (3) is arranged in the storage space of the heating storage part (2), each of which is provided and arranged for heating the drinking water, wherein the heat exchanger of the heating storage part (3) has a cold water connection (15) for supplying untempered drinking water and the heat exchanger of the hot water storage part (4) has a hot water connection (8) for discharging heated drinking water, wherein the two heat exchangers (3, 4) are hydraulically connected to one another and connected in series, so that untempered drinking water, starting from the cold water connection (15), first flows through the heat exchanger of the heating storage part (3) and can be heated by the heating water located in the storage space of the heating storage part (2), the drinking water heated in this way then flows from the heat exchanger of the heating storage part (3) into the heat exchanger of the hot water storage part (4), flows through this in the direction of the hot water connection (8) and can be further heated by the heating water located in the storage space of the hot water storage part (1), and the heated drinking water can exit the heat exchanger of the hot water storage part (4) at the hot water connection (8). [2] Combined hot water and heating storage tank (21) according to claim 1, characterized byan overflow chamber (5) by means of which the flow connection of the heating storage part (12) and the heating circuit flow connection (11) are fluidically connected to one another, wherein the overflow chamber (5) extends through the storage space of the heating storage part (2), wherein the overflow chamber (5) has at least one opening in the upper region through which both heating water can flow into the storage space of the heating storage part (2) and heating water can flow from the storage space of the heating storage part (2) into the overflow chamber (5), so that by means of the overflow chamber (5) an overflow of different volume flows from the flow connection of the heating storage part (12) to the heating circuit flow connection (11) on the one hand and from the flow connection of the heating storage part (12) into the storage space of the heating storage part (2) on the other hand is possible, wherein, when the heat pump is not in operation,Heat can flow from the upper storage space of the heating storage part through the overflow chamber (5) into the heating circuit flow connection (11). [3] Combined hot water and heating storage tank (21) according to claim 1 or 2, characterized by a circulation connection (20) for connection to a circulation pipe system of the building, wherein the circulation connection (20) is arranged on a connecting line between the heat exchanger of the hot water storage part (4) and the heat exchanger of the heating storage part (3) and is hydraulically connected to both heat exchangers (3, 4)

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