DE102014206415A1 - Heat storage arrangement and method for operating such - Google Patents

Abstract

The invention relates to a heat storage arrangement comprising an inner storage tank, an inner heat-insulating layer at least partially surrounding the inner storage tank, a arranged on the side facing away from the inner storage tank side of the thermal barrier coating device for transmitting a passing through the inner thermal insulation layer loss heat flux of the inner storage tank on a heat transfer fluid and a Evaporator-containing heat pump, the device with the evaporator of the heat pump is hydraulically connected.

Description

The present invention relates to a heat storage arrangement and a method for operating such. In this case, the heat storage arrangement contains an inner storage tank, an inner heat-insulating layer at least partially surrounding the inner storage tank, a device for transferring a heat loss layer passing through the inner heat-insulating layer of the inner storage tank to a heat transfer fluid and a heat pump containing an evaporator. The device for transmitting the heat flow is hydraulically connectable to the evaporator of the heat pump.

In the area of building energy supply and thermal solar energy use, solar thermal combined systems are systems that serve both domestic water heating and heating support. These plants usually have at least one hot water tank, which is provided with a thermal insulation to reduce heat losses of the memory. The term "heat losses of the storage" or in short "storage losses" is understood here to mean the self-discharge of the storage due to the heat flow through the thermal insulation to the environment. Typical combination storage tanks according to the prior art have a heat loss rate of about 4 W / K at a volume of 1,000 liters. With a mean temperature difference to an unheated installation room of 35 K and a heating period of 8 months (September to April), these heat losses add up to about 800 kWh.

Combined units, especially with regard to domestic water heating, use different types of storage, of which the most important ones are from Peuser ( FA Peuser, K.-H. Remmers and M. Schnauss: Long-term experience solar thermal, Solarpraxisverlag, ISBN 3-934595-07-3, 2001 ) to be discribed. With regard to the classification of thermal energy storage devices, these are all sensitive heat storage devices that store heat by increasing the temperature of a medium (without phase change). Since the storage medium here is consistently water, it can immediately serve as a heat transfer fluid, are flowed through with the heat exchanger (eg radiator).

In recent years, more and more concepts are being worked on in order to increase the solar coverage of the total heat demand of a building in combination plants. This is compared to today typical combination systems both an increase in the collector surface and an increase in the heat capacity of the memory required. The concept of the "solar-active house" relies on very large storage volumes for hot water storage tanks, whereby the long-term goal is the development of novel thermochemical heat storage with a higher energy density than hot water storage systems by a factor of eight. Another approach to building energy supply that has been increasingly pursued in recent years is the combination of thermal solar energy use with electric heat pumps.

In latent heat storage, a phase change (usually solid) is used to increase the usable heat capacity in a given temperature interval. The phase change material (PCM, eg water / ice, salt hydrates or paraffin) can either fill directly as a non-encapsulated substance a storage container in which a heat exchanger is integrated, or the phase change material can be integrated into a composite (eg a graphite matrix to increase the thermal conductivity) from the shaped body such as Plates are formed, which are brought into heat exchange with a heat transfer fluid. An encapsulation of the phase change material in macrocapsules or microcapsules is known, wherein the macrocapsules can be introduced directly into a storage container, so that between the capsules a heat transfer fluid can flow.

Phase change slurries (PCS) are also known which consist of a suspension of PCM microcapsules in a heat transfer fluid or of an emulsion. The use of PCS in a heat storage for buildings will be in the EP 1 798 487 B1 described.

Furthermore, sorption storage and thermochemical storage are known. The main problems of the sorption reservoirs to date are high costs, not yet available sorption materials with regard to the requirement of the application (in particular storage density and long-term stability) and not yet mature concepts for system integration in building energy systems.

The most important goals in the further development of thermal storage are the increase of the usable energy density and, if necessary, the heat transfer performance of the storage (if the storage medium is not also heat transfer fluid) and the increase in storage efficiency, which is defined as the energy usable in the storage discharge in relation to the Storage charge spent energy. To increase storage efficiency, the reduction of heat loss plays a key role in sensitive and latent heat storage. An important approach here is improved thermal insulation (eg by evacuated highly porous insulating materials such as perlite or fumed silica, so-called vacuum super insulation). For a given storage capacity is a close Relationship between energy density and storage efficiency, as a memory with higher energy density in a smaller volume and thus can be realized with a smaller surface, so that the heat insulation is reduced with the same quality of thermal insulation.

Since latent heat storage (and especially sorption and thermochemical storage) are significantly more expensive than water storage due to the material costs in the production and also in most known designs, the heat transfer performance is a limiting factor, was looking for ways to take advantage of latent or Sorptionsspeicher (high energy density or significantly reduced heat losses) with those of water storage (cost-effective, high heat transfer performance) to combine. As a result of these efforts, various combination memories are known. For example, this describes EP 2204618 A2 a hot water tank, which contains a jacket around the water tank in the upper area, which is filled with a PCM.

Furthermore, thermal storage are known, which are used in combination with solar and heat pump systems. For example, in the DE 20 2006 012 871 U1 a water / ice storage described which serves to equalize the heat input of a heat pump and is located in the flow of the heat pump evaporator.

The combination of an absorption chiller / heat pump with a latent storage is in the WO 2006/100047 A2 described. Here, the latent heat storage is integrated into the condenser circuit of the absorption heat pump.

In large hot water tanks according to the prior art, as required for combination systems with high solar degrees of coverage, the heat losses to the environment represent a hitherto unavoidable disadvantage Standard DIN EN 12977-1 (2012) If the heat loss rate of hot water storage tanks in W / K is not greater than 0.16 × √V _n with the nominal volume V _n in liters. For a storage volume of 10 m ³ , according to this formula, the heat loss rate is 16 W / K and the heat losses / day at ΔT = 35 K is 13 kWh. For a typical small combi system with a 1 m ³ solar storage tank, permissible heat losses of 4.3 kWh / day result under the same conditions. These heat flows are disadvantageous in that they increase the heating energy requirement of the building (in particular the proportion not covered by the solar system) when the storage is located outside the insulated building envelope. If it is inside the insulated shell, these heat flows cover part of the heating load in winter, but in summer they can contribute to overheating of the building or increase the need for cooling.

Overall, the development of thermal storage for solar thermal combined systems with high solar coverages is still unsatisfactory. The concept of the "Solar Active House" with a very large hot water tank (from about 5 m ³ ) addresses so far only one niche market (almost exclusively in new construction), since the memory should be due to the large heat losses within the insulated building envelope and this can rarely be realized in old buildings.

However, there is a need for improved systems for the thermal solar energy use due to the great potential for the substitution of fossil fuels, especially in old buildings. Here are the attractive ways to reduce the heating demand in the course of a renovation often limited, be it due to preservable facades or due to only very expensive recoverable thermal bridges, lack of space for the roof truss and basement ceiling insulation etc. The use of highly efficient compression heat pumps is often in the inventory refurbishment complicates the fact that the soil as a heat source can not be developed or only with great effort and possibly unreasonable burdens on the building users. However, electric heat pumps that use air as a source of heat can usually achieve little more than the primary energy efficiency of gas condensing boilers - with annual work figures of 2.6.

When retrofitting thermal storage in old buildings often there is a problem regarding the accessibility of the installation rooms (eg basement rooms). The recoverable storage volume is often limited by the dimensions of the access ways (doors, stairs). This problem can be solved either by a construction of a storage container on site in the installation room or by a modular storage concept. For example, this describes EP 2532940 A2 a pressure-loadable segment memory, which can be designed so that the individual segments do not need to be made pressure-tight at their contact surfaces. The hydraulic connection between the individual segments can be realized by means of pipe grommets, which seal when filling the memory under pressure due to the pressure generated by the pressure to the outside.

Like from the DE 20 2006 012 871 U1 is known, it is advantageous to connect the evaporator of a heat pump a buffer memory when a solar collector is the only heat source for the heat pump. However, there is not the use of the heat loss of another heat storage described. The buffer is designed as water / ice storage. Such is not readily available for sorption heat pumps that use water as a working fluid, since usually the evaporator of the heat pump must be kept at temperatures above 0 ° C to prevent its freezing.

For solar thermal combined systems (domestic hot water and heating support) with high solar cover levels (based on the total heat demand), there are so far no mature concepts for the integration of sorption heat pumps as an alternative heat source. Furthermore, it would be desirable to be able to set up the required large hot water tank outside the insulated building envelope. However, there is no system for recovering the then during the heating period occurring heat losses of this memory.

Object of the present invention is therefore to provide a heat storage arrangement that significantly increases the total energy efficiency of the system with low cost in solar thermal combined systems with a heat pump as an alternative heating system. In particular, the heat storage arrangement should be advantageously usable in cases where the solar heat storage is outside the insulated building envelope, as is often the case with energetically renovated existing buildings. Furthermore, the solution according to the invention should be so executable that a temporal flexibilization of the heat pump operation (load displacement / load decoupling) is made possible according to aspects that are independent of the current heat demand of the building and the current solar radiation offer.

This object is achieved with respect to a heat storage arrangement having the features of patent claim 1 and with regard to a method for operating a heat storage arrangement having the features of patent claim 15. The respective dependent claims are advantageous developments.

According to the invention, a heat storage arrangement is specified which comprises an inner storage tank, an inner heat-insulating layer at least partially surrounding the inner storage tank, a device disposed on the side of the thermal storage layer facing away from the inner storage tank for transferring a heat loss layer passing through the inner heat-insulating layer of the inner storage tank to a heat transfer fluid and a Contains an evaporator containing heat pump. The device for transmitting the waste heat flow is hydraulically connectable to the evaporator of the heat pump.

According to the invention it was recognized that for solar thermal combined systems (for hot water and heating support), which use a heat pump as an alternative heat source, the waste heat flows can be used by the storage insulation in large parts in a simple manner, and that this to a significant increase in the solar coverage of the system and lead to a corresponding primary energy savings. By the heat storage arrangement according to the invention in this case the loss of heat flow of an insulated heat storage can be collected at a low temperature level and this are fed to the evaporator of a heat pump.

For the energetic refurbishment of existing buildings, the system according to the invention has the advantage that heat storage of solar thermal combined systems can be arranged outside the insulated building envelope, without the heat flow is lost to the heating system through the thermal insulation of the memory. By the system according to the invention, therefore, the primary energy cost of the heating system compared to solar thermal combination systems according to the prior art can be reduced with the same collector and memory size.

Even compared to already known from the prior art solar thermal combi systems in conjunction with a heat pump, the primary energy cost of installation is reduced or increased the solar coverage. This is achieved by utilizing the heat losses of the accumulator to raise the temperature level in the evaporator circuit of the heat pump, so that the heat pump can achieve a higher annual operating efficiency.

A preferred embodiment provides that the device for transmitting a heat flow is designed as a sheath storage, wherein the sheath memory, a fluid or a phase change material (PCM), which may be in thermal contact with the heat transfer fluid contains.

A further preferred embodiment provides that the device for transmitting a heat flow is designed as a heat exchanger and contains no further memory elements.

In a further preferred embodiment of the heat storage arrangement according to the invention an outer heat-insulating layer is arranged on the side facing away from the inner heat-insulating layer side of the device designed as a sheath memory, wherein the heat transfer resistance the inner thermal barrier coating is greater than the thermal resistance of the outer thermal barrier coating. Due to the outer heat-insulating layer, a condensation of atmospheric moisture on the outside of the storage arrangement can be avoided since the water vapor contained in the ambient air can not reach the cold surfaces of the heat storage arrangement. In this case, relatively diffusion-tight (closed-cell) insulating materials can be used as the outer thermal barrier coating.

Furthermore, it is preferred that the device formed as a sheath storage is formed by at least two, preferably made of plastic, hollow body, each having an outer wall and an inner side and an outer side, wherein the shape of the at least two hollow body adapted to the surface of the inner thermal barrier coating is and each two adjacent hollow body of the at least two hollow bodies have a common contact surface. The at least two hollow bodies are in this case arranged substantially in a form-fitting manner around the arrangement of inner storage tank and inner heat-insulating layer. Advantage of such a modular, consisting of several hollow sheath storage is its easier Einbringbarkeit in rooms with narrow accesses (as typically cellar rooms in the renovation of buildings). In this case, the effective storage capacity that can be introduced into a given room with narrow access (door, stairs) can be significantly increased compared to a water storage tank according to the prior art. For the hollow body, extrusion blow molding offers a cost-effective production process.

A further preferred embodiment provides that in each case one of the at least two hollow bodies, and in each case a part of the inner thermal barrier coating and optionally a part of the outer thermal barrier coating is integrated in each one of at least two prefabricated elements, wherein the at least two prefabricated elements substantially form fit are arranged around the inner storage container.

A further preferred embodiment of the heat storage arrangement according to the invention provides that the inner thermal barrier coating consists of a hard foam and substantially positively abuts a wall of the inner storage container, also the outer wall of the at least two hollow body and / or optionally the outer thermal barrier coating is made hard enough, in order to limit a deformation of the outside of the hollow body, and the at least two hollow bodies are held in position by at least one tensile structure, preferably a steel drawstring, wherein the at least one tensile structure on an outer periphery of the assembly comprising the inner storage container inner heat-insulating layer, which is arranged at least two hollow body and optionally the outer thermal barrier coating. By this arrangement prevents the hollow body bulge too much at the common contact surfaces. Furthermore, can be operated at a higher pressure by the support on the inner storage tank and the drawstrings of the shell memory. An annular arrangement of the hollow body offers the advantage over an alternative linear arrangement that the pressure-stable end plates required for a linear arrangement are not required.

Furthermore, it is preferred that the at least two hollow bodies are designed such that they have at least one fluid passage at each contact surface to an adjacent hollow body, which is sealed by a pressure applied via the zugbelastbare structure contact pressure to the outside, and the at least two hollow body in addition a total of two more Have fluid connections on its outer side, so that at the two or more hollow bodies, a fluid circuit is constructed, through which all existing hollow body can be flowed through. Particularly preferably, the at least two hollow bodies are designed so that they have at each contact surface to an adjacent hollow body two fluid passages at different heights and also each have a tensile structure in the respective height of these two fluid passages. In this way, the contact pressure can be maximized. In addition, if two fluid passages are present at different heights, as a result of the buoyancy forces, a thermal stratification in the hollow bodies can occur.

In a further preferred embodiment, the at least two prefabricated elements are designed so that heat-conducting planar elements abut in the areas on the inner thermal barrier coating, in which a heat flow could pass from the inner storage tank to the at least two hollow bodies past the surroundings of the heat storage arrangement, and the heat-conducting sheet-like elements have an overlapping surface with the inside of the at least two hollow bodies in order to at least partially redirect the heat flow to the at least two hollow bodies, the heat-conducting sheet-like elements preferably being metal sheets. By this embodiment, an even more efficient recovery of the heat losses of the inner storage container, in particular at the lid and bottom area, can be achieved.

Furthermore, it is preferred that the jacket store at least one phase change material (PCM) contains, which has a melting point between -5 ° C and 30 ° C. The PCM is preferably ice here if the refrigerant used in the heat pump allows operation below 0 ° C. This is the case, for example, with sorption heat pumps with ammonia or methanol as refrigerant and with almost all compression heat pumps.

In a further preferred embodiment, the jacket reservoir contains at least one phase change slurry (PCS) which is pumpable and can be used to transfer heat to the heat pump evaporator, the PCS containing at least one phase change material (PCM) having a melting point between 5 ° C and 30 ° C. The phase change fluid here is preferably an ice slurry.

It is further preferred that the melting point of the at least one phase change material (PCM) is between 4 ° C and 20 ° C. Here, the refrigerant used in the heat pump is preferably water.

A further preferred embodiment of the heat storage arrangement according to the invention provides that the evaporator of the heat pump in addition to the shell memory is still connected to at least one other heat source, wherein at least a serial flow through the further heat source, the shell memory and the evaporator of the heat pump with the heat transfer fluid allows in this order becomes. In this way, a temporal flexibility of the heat pump operation (load displacement / load decoupling) can be made possible.

Furthermore, it is preferred that the heat pump is a sorption heat pump, in which water is preferably used as the refrigerant. In the event that the heat pump is a thermally driven heat pump (in particular sorption heat pump), the temporal flexibility is relevant if the heat source of the heat pump is coupled to a power generator (cogeneration). Due to the high mass-specific heat of evaporation of water, the highest (annual) operating figures can be achieved with water as the refrigerant for sorption heat pumps, provided that suitable low-temperature heat sources are available.

The present invention is also directed to a method for operating a heat storage arrangement according to the invention, wherein heat from a heat source, preferably a solar thermal system, introduced into the inner storage tank and used after removal to cover a heating and / or hot water demand, wherein by the heat pump discharged additional heat is also used to cover the heating and / or hot water demand, characterized in that when the heat of the inner storage tank in a foreseeable future time, preferably within the next two to four days, probably not alone Heizwärme- and / or hot water demand can cover, the heat pump is switched on before the complete discharge of the inner storage container periodically to cover the heating and / or hot water demand in the way that over the storage period of the device to trans Actuation of a heat flow of the evaporator of the heat pump receives at least the loss of heat flow from the inner storage tank.

Whether in a certain time the heat of the inner storage tank alone can cover the heat and / or hot water demand can be assessed for example by means of a predictive control.

If the device for transmitting a heat flow is designed as a sheath storage, this is preferably operated in a temperature range between 0 ° C and 20 ° C. The volume of the jacket storage is then preferably dimensioned so that the heat flow from the inner storage tank over a period of 8 hours at most leads to a temperature increase of 10 K in the shell memory. As a result, a temporal flexibility is achieved with respect to the heat pump operation, which can be used for example in compression heat pumps to take account of grid loads and fluctuating electricity prices.

If the heat pump is an electric heat pump, it is possible to use the sheath accumulator for charging the inner storage container with high power, preferably in times of favorable electricity supply.

A further preferred variant of the method according to the invention provides that the heat pump is a thermally driven heat pump, preferably a sorption heat pump, and drive heat for the heat pump is provided by an additional heat source, preferably a burner or a CHP plant.

A further preferred variant of the method according to the invention provides that, when a first threshold temperature in the inner storage tank is undershot, the heat and / or hot water requirement is primarily covered by the heat from the heat pump, when a second threshold temperature is exceeded in the apparatus for transmitting a heat flow, and the coverage of the heating heat demand otherwise takes place primarily by the heat from the inner storage tank.

In a further preferred variant of the method according to the invention, the inner storage tank is used as a layer heat storage, wherein the heat pump additionally introduces heat into a central region of the inner storage tank. In this way, the annual yield of the solar system can be increased.

The present invention will be explained in more detail with reference to the following figures, without restricting the invention to the specifically illustrated embodiments and parameters.

1 shows a section of a cross section through a part of a heat storage arrangement according to the invention. An inner storage tank 1 is of an inner thermal barrier coating 2 surround. On the inner storage tank 1 opposite side of the thermal barrier coating 2 there is a device 3 for the transmission of a through the inner thermal barrier coating 2 passing heat loss heat of the inner storage tank 1 to a heat transfer fluid, which is designed as a sheath storage. On the inner thermal barrier coating 2 opposite side of the device designed as a sheath storage device 3 is an outer thermal barrier coating 5 arranged. The sheath storage is in this case composed of several hollow bodies, which were produced by extrusion blow molding of a suitable plastic (eg HDPE). The individual hollow bodies are shaped so that they form fit around the inner storage tank 1 and the inner thermal barrier coating 2 arrange to be ordered.

2 shows a part of a device 3 for the transmission of a through the inner thermal barrier coating 2 passing loss heat flow of the inner storage tank 1 to a heat transfer fluid from different perspectives. The device 3 is designed as a shell memory and is constructed from hollow bodies. The connection of the hollow body is made by a quick connection system with flexible hose pieces 6 and prefabricated on the hollow body fastened fittings 7 , Such quick connectors are known from solar thermal collectors and are usually realized there because of the high temperature requirements with stainless steel corrugated pipes. From the heating technology are also tool-free mountable quick connectors for plastic / metal composite pipes known that may be suitable here (eg plug-in fittings). In the area of fittings 7 are on the hollow bodies indentations or recesses, which is a compound of the elements in a positive arrangement around the inner storage container 1 allow around. The entirety of the hollow body is connected by a Tichelmann interconnection in order to achieve the most uniform possible flow through the elements. To further encourage this, are within the storage elements between the fittings 7 perforated pipes 9 arranged, which together with the connecting pieces represent the distributors and collectors of the Tichelmann interconnection.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1798487 B1 [0006]
• EP 2204618 A2 [0009]
• DE 202006012871 U1 [0010, 0016]
• WO 2006/100047 A2 [0011]
• EP 2532940 A2 [0015]

Cited non-patent literature

• FA Peuser, K.-H. Remmers and M. Schnauss: Long-term experience solar thermal, Solarpraxisverlag, ISBN 3-934595-07-3, 2001 [0003]
• Standard DIN EN 12977-1 (2012) [0012]

Claims (18)

Heat storage arrangement comprising an inner storage tank ( 1 ), an inner storage container ( 1 ) at least partially surrounding inner thermal barrier coating ( 2 ), one on the inner storage tank ( 1 ) facing away from the thermal barrier coating ( 2 ) arranged device ( 3 ) for the transmission of a through the inner thermal barrier coating ( 2 ) passing heat loss heat of the inner storage container ( 1 ) to a heat transfer fluid and a heat pump containing an evaporator ( 4 ), the device ( 3 ) with the evaporator of the heat pump ( 4 ) is hydraulically connectable. Heat storage arrangement according to the preceding claim, characterized in that the device ( 3 ) is designed for transmitting a heat flow as a shell memory, wherein the shell memory, a fluid or a phase change material (PCM), which may be in thermal contact with the heat transfer fluid contains. Heat storage arrangement according to claim 1, characterized in that the device ( 3 ) is designed to transmit a heat flow as a heat exchanger and contains no further memory elements. Heat storage arrangement according to claim 2, characterized in that on the inner thermal barrier coating ( 2 ) facing away from the formed as a sheath device device ( 3 ) an outer thermal barrier coating ( 5 ), wherein the heat transfer resistance of the inner thermal barrier coating ( 2 ) is greater than the thermal resistance of the outer thermal barrier coating ( 5 ). Heat storage arrangement according to one of claims 2 or 4, characterized in that the device designed as a sheath memory ( 3 ) is formed by at least two, preferably made of plastic, hollow body, each having an outer wall and an inner side and an outer side, wherein the shape of the at least two hollow body to the surface of the inner thermal barrier coating ( 2 ) and each two adjacent hollow body of the at least two hollow bodies have a common contact surface. Heat storage arrangement according to the preceding claim, characterized in that in each case one of the at least two hollow bodies, and in each case a part of the inner thermal barrier coating ( 2 ) and, if appropriate, in each case a part of the outer thermal barrier coating ( 5 ) is integrated in each one of at least two prefabricated elements, wherein the at least two prefabricated elements substantially form-fitting manner around the inner storage container ( 1 ) are arranged around. Heat storage arrangement according to one of the two preceding claims, characterized in that the inner thermal barrier coating ( 2 ) consists of a hard foam and substantially form-fitting manner on a wall of the inner storage container ( 1 ) is applied, in addition, the outer wall of the at least two hollow body and / or optionally the outer thermal barrier coating ( 5 ) is designed hard enough to limit deformation of the outside of the hollow body, and the at least two hollow body by at least one zugbelastbare structure, preferably a tension band made of steel, are held in position, wherein the at least one tensile structure on an outer periphery of the assembly comprising the inner storage container ( 1 ), the inner thermal barrier coating ( 2 ), the at least two hollow bodies and optionally the outer thermal barrier coating ( 5 ) is arranged. Heat storage arrangement according to the preceding claim, characterized in that the at least two hollow bodies are designed so that they have at each contact surface to an adjacent hollow body at least one fluid passage, which is sealed by a coatable via the zugbelastbare structure contact pressure to the outside, and at least two Hollow body additionally have a total of two further fluid ports on its outer side, so that at the two or more hollow bodies, a fluid circuit is constructed, through which all existing hollow body can be flowed through. Heat storage arrangement according to one of the two preceding claims, characterized in that heat-conducting sheet-like elements in the areas on the inner thermal insulation layer ( 2 ) are present, in which a heat flow from the inner storage container ( 1 ) could pass past the at least two hollow bodies past the surroundings of the heat storage arrangement, and the heat-conducting sheet-like elements have an overlap surface with the inside of the at least two hollow bodies in order to at least partially redirect the heat flow to the at least two hollow bodies, the heat-conducting sheet-like elements preferably being metal sheets are. Heat storage arrangement according to one of claims 2 or 4 to 9, characterized in that the shell memory contains at least one phase change material (PCM) having a melting point between -5 ° C and 30 ° C. Heat storage arrangement according to one of claims 2 or 4 to 9, characterized in that the jacket store at least one Phase change slurry (PCS), which is pumpable and for heat transfer to the evaporator of the heat pump ( 4 ), wherein the PCS contains at least one phase change material (PCM) having a melting point between -5 ° C and 30 ° C. Heat storage arrangement according to the preceding claim, characterized in that the melting point of the at least one phase change material (PCM) is between 4 ° C and 20 ° C. Heat storage arrangement according to one of claims 2 or 4 to 11, characterized in that the evaporator of the heat pump ( 4 ) in addition to the jacket memory is still connectable to at least one further heat source, wherein at least one serial flow through the further heat source, the shell memory ( 3 ) and the evaporator of the heat pump ( 4 ) is made possible with the heat transfer fluid in this order. Heat storage arrangement according to one of the preceding claims, characterized in that the heat pump ( 4 ) is a sorption heat pump, wherein preferably water is used as the refrigerant. Method for operating a heat storage arrangement according to one of the preceding claims, wherein heat from a heat source, preferably a solar thermal system, in the inner storage container ( 1 ) and used after removal to cover a heating and / or hot water demand, whereby by the heat pump ( 4 ) is also used to cover the heating and / or hot water demand, characterized in that when the heat of the inner storage tank ( 1 ) within a foreseeable future, preferably within the following two to four days, not expected to cover the heating and / or hot water demand alone, the heat pump ( 4 ) even before a complete discharge of the inner storage container ( 1 ) is periodically switched on to cover the heating and / or hot water demand in such a way that in the time average over the storage period of the device ( 3 ) for transmitting a heat flow of the evaporator of the heat pump ( 4 ) at least the lost heat flow from the inner storage tank ( 1 ). Method according to the preceding claim, characterized in that the heat pump ( 4 ) is a thermally driven heat pump, preferably a sorption heat pump, and by an additional heat source, preferably a burner or a CHP plant, drive heat for the heat pump ( 4 ) provided. Method according to one of the two preceding claims, characterized in that when falling below a first threshold temperature in the inner storage container ( 1 ) covering the heat and / or hot water demand primarily by the heat from the heat pump ( 4 ) takes place when in the device ( 3 ) is exceeded to transfer a heat flow, a second threshold temperature, and the coverage of the heating heat requirement otherwise primarily by the heat from the inner storage tank ( 1 ) he follows. Method according to one of claims 15 to 17, characterized in that the inner storage tank ( 1 ) is used as a layer heat storage, wherein the heat pump ( 4 ) additional heat in a central region of the inner storage container ( 1 ).

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