Outdoor Energy Storage Device

Abstract

The present invention relates to an outdoor energy storage device (40) for a system (2) for temperature regulation, in particular heating, cooling or air conditioning, of an interior space (4) of a building (6), the outdoor energy storage device (40) being installable outside the building (6) and having a modular design and comprising at least one energy storage device (14), an air heat exchanger (22) and a device unit (50), the device unit (50) being arranged between the energy storage device (14) and the air heat exchanger (22). The device unit (50) has an exhaust connection (56) for the exhaust of the building (6) that distributes the exhaust air flowing in from the building (6) to the device unit (50), and an insulator (66) insulates the device unit (50) from the surrounding environment. After passing through the device unit (50), the exhaust air of the building (6) is first introduced by a fan (80) into an energy storage device (14) and then into an air heat exchanger (22), where heat is recovered in the energy storage device (14) and the air heat exchanger (22).

Description

[Technical Field]

[0001] The present invention relates to an outdoor energy storage device for an air conditioning system for an interior space of a building. Such an outdoor energy storage device is located outdoors and is at least partially buried underground. [Background technology]

[0002] A system for conditioning the interior space of a building may include an energy storage unit for energy transfer and storage by a water heat exchanger in a liquid reservoir. The liquid reservoir is located outdoors, and the water heat exchanger and building heat pump are located indoors. Other building service components, such as heating and hot water, are also located indoors. These devices are easily accessible and protected within the building, but still require a large amount of space.

[0003] Patent Document 1 discloses a heat transfer device having a water heat exchanger in a liquid storage tank as a heat storage device into which exhaust air is introduced, and an air heat exchanger located in the exhaust air flow. A heat pump is provided not only in the water heat exchanger but also in the air heat exchanger. The heat pump is arranged so that the exhaust air flows over the heat pump, and the exhaust air is preheated by the motor-compressor unit of the heat pump before coming into contact with the heat storage medium, and then heat is transferred to the heat storage medium.

[0004] Patent Document 2 relates to an air conditioning system for interior spaces of a building connected via at least one exhaust duct, where one or more interior spaces are equipped with an air conditioner having an outside air source and supplying supply air or recirculated air to the interior spaces. The air conditioner is connected to a fluid circuit of a heat pump, and the exhaust duct of the heat pump and another fluid circuit are connected to an energy storage unit installed outdoors. The energy storage unit is designed to transfer and store energy using a heat exchanger in a liquid storage tank, and the liquid storage tank is connected to another fluid circuit of the heat pump via the heat exchanger, and the exhaust air is introduced into the liquid storage tank via the heat exchanger.

[0005] Patent document 3 discloses a heat pump system with a water tank buried underground as the main heat source of the heat pump and an additional pump that can introduce water from an additional heat accumulator into the water tank. When the heat supply in the water tank is used up, a control device operates the additional pump until at least a portion of the water in the water tank is replaced.

[0006] Patent Document 4 discloses a heating and cooling system that uses a heat pump and a phase-change heat storage device to provide heating, cooling, and non-potable hot water to a building. A heat exchanger in the exhaust air stream and another heat exchanger attached to the building's wastewater pipe extract heat from used air and gray water, which is then transferred to a heat reservoir via an ethylene glycol circuit. This heat is extracted from the heat storage device and supplied to the heat pump's evaporator when heating is required. The potable water circuit flows through a condenser, a hot water tank, and, if necessary, a heat exchanger in the air conditioning system. Cooling is achieved by extending the ethylene glycol circuit and introducing it into the heat exchanger.

[0007] Patent Document 5 discloses an energy storage device, preferably at least partially buried underground. The device includes a water heat exchanger and an air heat exchanger disposed above the water heat exchanger, the water heat exchanger being disposed in a liquid reservoir formed in the floor between an inner wall and an outer wall. The inner wall encloses a cavity at least partially filled with at least one first container and one second container, the first container and the second container having equal volumes, each forming one pole of a redox flow battery.

[0008] Patent Document 6 relates to an air-cooled heat storage air conditioning system. The housing includes an exhaust air circulation fan duct, a heat storage fan duct equipped with a heat storage tank that exchanges heat with the exhaust air, an air supply fan duct equipped with an evaporator, an exhaust fan duct equipped with a condenser, and a compressor that operates the evaporator, condenser, and heat storage tank. The compressor and the circulation exhaust fan passage are arranged in parallel, sandwiched between the air supply fan passage and the exhaust fan passage. The heat storage fan passage is located at the end of the column direction of the air passage, adjacent to the aforementioned passage that forms the housing. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] GB Patent Application Publication No. 2076139 [Patent Document 2] German Patent Invention No. 102020119653 [Patent Document 3] European Patent Application Publication No. 2090838 [Patent Document 4] GB Patent Application Publication No. 2247072 [Patent Document 5] German Patent Invention No. 102019135681 [Patent Document 6] Japanese Patent Application Laid-Open No. 2002-267214 Summary of the Invention [Problem to be solved by the invention]

[0010] SUMMARY OF THE INVENTION It is an object of the present invention to provide a space-saving device for an air conditioning system. [Means for solving the problem]

[0011] This objective is achieved by an outdoor energy storage device for a system for temperature regulation, particularly heating, cooling, or air conditioning, of the interior space of a building. The outdoor energy storage device can be installed outdoors and has a modular design. It includes at least one energy storage device, an air heat exchanger, and a device unit. The energy storage device is designed to include a liquid reservoir with a water heat exchanger for energy transfer and energy storage. The air heat exchanger surrounds a radial fan at least in multiple sections along its periphery, thereby generating an airflow passing through the air heat exchanger from the outside to the inside in the radial direction and discharging the air axially upward at the radial fan. The device unit is disposed between the energy storage device and the air heat exchanger and has an exhaust connection for the building's exhaust air, which distributes exhaust air flowing from the building into the device unit. The device unit includes an insulator that isolates the device unit from the ambient environment. After passing through the device unit, the building exhaust air is directed by a fan first to an energy storage device and then to an air heat exchanger, whereby heat is recovered at least in the energy storage device and, optionally, also in the air heat exchanger.

[0012] The outdoor energy storage device is constructed with individual components modularized, allowing it to be delivered pre-assembled and requiring no indoor installation space. To achieve the goal of a compact design and minimizing energy loss in the liquid storage tank, the placement of the components is important. In this invention, all components are stacked on top of each other. The energy storage device allows energy to be stored in the liquid. Energy is transferred not only via an air heat exchanger but also via a water heat exchanger. Individual functional modules important to this function are located within the device unit. Exhaust air is the indoor air discharged from the building, and its thermal energy passes through the energy storage device to recover hot or cold air. Traditionally, this device has been used for temperature control. That is, by heating the functional modules in the outdoor energy storage device unit in winter and cooling them in summer, safe operation is possible even when the outdoor temperature is low. Therefore, "temperature control" includes both heating and cooling. Thus, the operation of functional modules in the device unit having electrical circuits sensitive to low temperatures is less affected by the cold, even when the outside temperature is low in winter, as the exhaust regulates the temperature of the water pump and any other functional modules that are optionally provided, and there is no need to heat the outdoor energy storage device.

[0013] In one embodiment of the present invention, the device unit comprises at least one heat pump coupled to a water heat exchanger and an air heat exchanger via a connecting plate.

[0014] In contrast to other known systems in which only the energy store with the liquid reservoir is installed outdoors, other functional modules, in particular the water pump, which is conventionally installed indoors, are relocated outdoors.

[0015] In a further embodiment of the invention, the device unit includes the devices necessary for the functioning of the energy storage and the air heat exchanger. Furthermore, the device unit may have a hot water tank for drinking or non-drinking water. Alternatively or additionally, the device unit may have an energy buffer, for example in the form of a water tank. The energy buffer is used to provide short-term energy and assist the functioning of the heat pump.

[0016] The interior of the device unit is insulated from the outside temperature and forms a space heated by the building's exhaust air. The same principle is used to regulate the temperature of other functional modules, especially their electrical circuits. The functional modules typically form sealed functional units with their own housings inside the outdoor energy storage device. The functional modules are replaceable, making maintenance and repair easy. In the electrical circuits, electrical and / or electromechanical components are combined to form a functional arrangement that controls, for example, the functional module or its interaction with other functional modules, or with other components of the system, including the energy storage device or the building. The electrical circuits are sensitive to low temperatures and are often a factor limiting the operation of the functional modules at low temperatures. Therefore, controlling the temperature of the electrical circuits in particular improves the operational reliability of the entire outdoor energy storage device.

[0017] In a further embodiment of the present invention, the device unit is surrounded on its outside by an insulator.

[0018] The device unit with the insulator is arranged between the energy storage device and the air heat exchanger in the form of a highly insulated "hot space", which can accommodate a hot water tank for drinking or non-potable water, so that energy loss to the environment is minimized.

[0019] In a further embodiment of the invention, the insulator covers the entire area of ​​the floor plate of the energy store.

[0020] In this case, the insulator can be reinforced around the perimeter with a collar, which is particularly advantageous in outdoor energy storage devices that are partially buried underground, with the collar covering the portion of the device that is buried underground.

[0021] The device unit and the air heat exchanger may include a side cover above the insulator. The air heat exchanger may have a cover.

[0022] Building exhaust air can enter the appliance through a piping connection below the edge, preferably laid underground.

[0023] The building's exhaust air, together with waste heat from electrical components in the device units, serves to control the building's temperature. The device units are typically provided with a number of functional modules advantageously designed to control heating, cooling, and / or ventilation within the system. The functional modules are arranged such that the exhaust air flows between the functional modules and reaches an energy storage device to control the temperature of the functional modules.

[0024] In one embodiment, a fan is disposed within the device unit, and the exhaust air is introduced into the energy storage device through the fan. The fan guides the exhaust air to the energy storage device. For this purpose, the energy storage device preferably includes an exhaust air conduction heat exchanger designed so that the exhaust air passes through a liquid reservoir before flowing to an air heat exchanger within the energy storage device. In this way, energy is already transferred between the exhaust air and the liquid in the liquid reservoir before the thermal energy of the exhaust air is used in the air heat exchanger.

[0025] In one embodiment, the outdoor energy storage device includes a base plate, a cover, and a peripheral sidewall between the base plate and the cover, which enclose a space in which the energy storage device and functional modules are housed. The base plate may have a raised edge associated with the trough shape. The outdoor energy storage device can be at least partially buried underground, with only the cover and upper sidewall protruding above ground. They can be integrated into the design of the outdoor space, for example, by adding vegetation or creating a garden pond on the cover.

[0026] Some exemplary embodiments will now be described in more detail with reference to the drawings. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a diagram illustrating an exemplary embodiment of a system for conditioning an interior space of a building. [Figure 2] FIG. 2 is a three-dimensional perspective view of an exemplary embodiment of an outdoor energy storage device. [Figure 3] FIG. 3 is a three-dimensional perspective view of the interior of the outdoor energy storage device. [Figure 4] FIG. 4 is a three-dimensional perspective view of a device unit of an outdoor energy storage device. [Figure 5] FIG. 5 is a three-dimensional perspective view of the interior of the outdoor energy storage device. DETAILED DESCRIPTION OF THE INVENTION

[0028] In the drawings, identical or functionally equivalent elements are designated with the same reference numbers.

[0029] FIG. 1 shows an exemplary embodiment of a system 2 for conditioning interior spaces 4 of a building 6. The building 6 may be, for example, a residential or office building. However, such a system 2 can be applied to various types of buildings and is therefore not limited to the illustrated example. Each interior space 4 is connected to an exhaust path via an exhaust vent 8, which discharges exhaust air from the interior space 4.

[0030] The outdoor energy storage device 40 is disposed outside the building 6, for example, in a garden or outdoor area. The outdoor energy storage device 40 is at least partially buried underground 30, with only the upper region of the outdoor energy storage device 40 protruding from the ground 30. The outdoor energy storage device 40 includes an energy storage device 14 having a water heat exchanger 18 inside a liquid storage tank 16 and an air heat exchanger 22 above the liquid storage tank 16. The outdoor energy storage device 40 also includes a device unit 50 having a heat pump 52 as a functional module 50. The heat pump is coupled to the water heat exchanger 18 and the air heat exchanger 22. The device unit 50 further includes a hot water tank 54 for potable water and / or non-potable water therein, from which potable water and / or non-potable water can be provided to the building 6.

[0031] The building 6 includes a node 12 that connects the building 6 to the outdoor energy storage device 40 via a connection 42. For this purpose, the connection 42 may include, for example, a supply line for the exhaust air from the building 6, an electrical connection, a drinking or non-potable water supply line, or a fluid line for a heat pump 52, which are necessary for the functioning of the outdoor energy storage device 40 and are returned to the building to allow for effective temperature regulation of the interior spaces 4 of the building 6 for heating, cooling, or air conditioning, as well as hot water. The shown connection 12 between the building 6 and the outdoor energy storage device 40 and the connection 42 to the outdoor energy storage device 40 should be understood as merely an example. Of course, the individual lines could be routed in dedicated supply ducts, could be combined in other ways between the building 6 and the outdoor energy storage device 40, and could even penetrate the building 6 at several points other than the node 12.

[0032] The exhaust duct 10 is coupled to the energy storage device 14 and the heat pump 52 , and the incoming exhaust air is distributed to the device unit 50 before entering the energy storage device 14 .

[0033] A water heat exchanger 18 with multiple pipes is provided in the liquid reservoir 16 of the energy storage device 14, and these pipes are connected to the heat pump 52 via a fluid circuit. A heat transfer medium flows through these pipes, and releases the heat or cold transferred from the liquid in the liquid reservoir 16. Typically, the liquid reservoir 16 is filled with water or a paraffin compound.

[0034] Above the liquid reservoir 16, an air heat exchanger 22 is provided above the insulating layer 20. The air heat exchanger 22 is divided into several segments and arranged around the central region 24 of the energy store 14. A heat exchanger 44 with flow conductors is arranged below the insulating layer 20. The heat exchanger 44 is designed so that the air flows through the liquid in the liquid reservoir 16 before entering the air heat exchanger 22 of the energy store 14. This allows the energy contained in the air flow to first be supplied to the liquid reservoir 16. The heat exchanger 44 guides the air radially outward through the liquid. The air is then guided from the radially outward direction through the air heat exchanger 22. A radial fan is provided in the central region 24, which draws air from the heat exchanger 22 together with the air flowing radially from the outside toward the central region 24, and the air is then discharged from the energy store 14.

[0035] The heat pump 52 is connected to the fluid circuit of the water heat exchanger 18. The heat pump 52 is similarly connected to the fluid circuit of the air heat exchanger 22, which includes a number of pipes. A heat transfer medium flows through the pipes, and the heat transfer medium transfers heat or cold from the air flowing past the pipes. The heat pump 52 can be equipped with pumping devices for the water heat exchanger 18 and the air heat exchanger 22. The fluid circuit 32 in the building 6 is coupled to the outdoor energy storage device 40 via a connection 42, and the heat pump 52 is connected to the air conditioner 34. In addition to being connected to the other fluid circuits 32, the air conditioner 34 receives outside air via a supply line 38 through an opening 36.

[0036] Another module may be a pump coupled to the hot water tank 54 for potable and / or non-potable water. This pump is designed to pump potable and / or non-potable water from the hot water tank 54 for potable and / or non-potable water into the building 6. For this purpose, the outdoor energy storage device 40 is provided with a potable and / or non-potable water connection that leads to the hot water line of the building 6.

[0037] 2 is a three-dimensional perspective view of an exemplary embodiment of the outdoor energy storage device 40. In addition to the features already described in relation to FIG. 1, an exhaust connection 56 can be seen, which is buried in the ground 30 and supplies the exhaust air from the building 6 to the outdoor energy storage device 40 in the area of ​​the device unit 50.

[0038] Furthermore, because the liquid storage tank 16 is surrounded by the ground 30, the air heat exchanger and other components of the device unit can be positioned above the ground 30, and these components are protected from environmental influences by the side cover 58 and cover 60. The cover 60 has an opening in the central region 24, through which air passing through the air heat exchanger is exhausted from the outdoor energy storage device 40. The side cover 58 gives the outdoor energy storage device 40 a visually appealing appearance, allowing it to blend in pleasantly with the exterior of a garden or other visible area to viewers. The cover 60 can be planted and filled with water, allowing for the creation of a flower bed or pond above the outdoor energy storage device 40. The tub-like lid can also be filled with decorative sand or gravel.

[0039] Below the side cover 58 there is provided a heat insulator 62 which is reinforced, particularly in the area of ​​the ground 30, by an additional collar 64 having insulating properties. The heat insulator 62 and the collar 64 form an insulator 66 which insulates particularly the device unit 50.

[0040] FIG. 3 shows a three-dimensional perspective view of the interior of the outdoor energy storage device 40 , excluding parts that obstruct the view into the interior, such as the side cover 58 , the cover 60 , or the casing of the liquid reservoir 16 .

[0041] It can be seen that a radial fan 70 is provided above the air heat exchanger 22 to remove air flowing through the air heat exchanger 22. The air heat exchanger 22, together with the radial fan 70, is designed as a modular unit that is attached to the device unit 50. The device unit 50 is surrounded by an insulator 66. The insulator 66 is continuous through the insulation 62 and collar 64 to removable side panels 68, which act as vacuum insulators and enclose the warm area inside the device unit 50. The removable side panels 68 allow access to the interior of the device unit 50 from all four sides.

[0042] The energy store is also arranged in a modular design below the device unit 50; in the example shown, only the support structure 72 supporting the water heat exchanger 18 and the casing surrounding the liquid reservoir 16 is visible. Due to its modular design, the outdoor energy store 40 can be installed in a particularly flexible and cost-effective manner, so that the functional modules provided in the device unit 50 can be selected to take individual characteristics into account when controlling the temperature of the building 6. It is therefore possible to leave out the hot water tank 54, for example, if the hot water supply to the building 6 is carried out in a different way. Naturally, other functional modules can also be integrated into the device unit 50.

[0043] 4 shows a three-dimensional perspective view of the interior of the device unit 50 of the outdoor energy storage device 40. In addition to the heat pump 52 and the hot water tank 54 already described, additional functional modules 74 are arranged in the device unit 50, such as a system module for operating the outdoor energy storage device 40 and an energy buffer in the form of a water tank. The individual modules are connected via connecting plates 76, which significantly simplifies the installation of hydraulic lines connecting to the various components of the outdoor energy storage device 40 and returning them to the building 6. In this configuration, the connecting plates 76 are arranged on the side walls of the device unit 50 in order to achieve a design of the device unit 50 that saves as much space as possible.

[0044] As described above, exhaust air from the building 6 is supplied to the device unit 50 via the exhaust air connection 56. For example, when the outside temperature is low, such as in winter, the temperature control using the exhaust air heats the functional modules 74 and the components of the heat pump 52 and the heated hot water tank 54, improving their operational reliability and performance. The temperature control effect is supported by the waste heat of the electrical circuits of the individual modules, which also contributes to heating. Heating the outdoor energy storage device 40 is not necessary. For example, when the outside temperature is high, such as in summer, the temperature control cools the individual modules. This is because the cooler exhaust air also releases heat from the electrical circuits. Next, the exhaust air path within the device unit 50 will be described with reference to FIG. 5 .

[0045] Figure 5 shows the exhaust path using a three-dimensional perspective view of the interior of the outdoor energy storage device.

[0046] Inside the device unit 50, a fan 80 is mounted on a base plate 82 separating the device unit 50 from the energy store 14, with the liquid reservoir 16 of the energy store 14 located below. Exhaust air from the building 6 enters through the exhaust connection 56 and is first distributed inside the device unit 50 for temperature control as previously described.

[0047] A first portion of the exhaust airflow coming from building 6 is designated by reference numeral 90 in Figure 5. The exhaust air passes through fan 80 and is introduced into the region above the water in liquid reservoir 16.

[0048] A second portion of the airflow is designated by reference numeral 92, where the energy of the building 6 exhaust air as well as the heat of the modules within the device unit 50 is transferred to the liquid reservoir 16 via the heat exchanger 44 (see FIG. 1).

[0049] A third portion of the airflow, designated 94, carries the exhaust air from the device units 50 to the air heat exchanger 22, where the remaining energy is absorbed. The exhaust air is supplied directly to the air heat exchanger 22 through an insulated hose (not shown). Condensed water from the heat exchanger, as well as water entering through the openings in the radial fan 70 due to rain, is also directed downward through this hose to the energy storage device 14. The exhaust air is then discharged as exhaust air from the outdoor energy storage device 40 in the central region 24.

[0050] The outdoor energy storage device 40 offers many advantages over conventional systems. Its efficiency is high because all components, especially the hot water tank 54 for potable and / or non-potable water, are conveniently housed within an insulated container 66, designed as a "hot space." The arrangement of the modules 74, heat pump 52, and, if applicable, the hot water tank 54, in the device unit 50 constitutes a modular system. The outdoor energy storage device 40 features a compact above-ground installation space, requires little outdoor space, and can be quickly and easily installed as an underground structure. This reduces the total cost due to reduced material usage and faster assembly. All technical components are accessible from all four sides, allowing for quick and easy assembly as well as optimal access for maintenance and service.

[0051] The features described above and in the claims, as well as those shown in the drawings, can be advantageously implemented individually or in various combinations. The invention is not limited to the exemplary embodiments described, but can be varied in many ways within the ability of those skilled in the art. [Explanation of symbols]

[0052] 2. System 4. Interior space 6. Building 8 exhaust port 10 Exhaust duct 12 Relay Point 14 Energy Storage 16 Liquid reservoir 18 Water heat exchanger 20 Insulation layer 22 Air heat exchanger 24 areas 30 ground 32 Fluid circuit 34 Air conditioner 36 Opening 38 Supply Line 40 Outdoor Energy Storage Device 42 Connection 44 Heat exchanger 50 device units 52 modules 52 Heat Pump 54 Hot Water Tank 56 Exhaust connection 58 Side cover 60 Cover 62 Insulation 64 colors 66 Insulator 68 Side Panel 70 Radial Fan 72 Support structure 74 Functional Modules 76 Connection plate 80 fans 82 Bottom plate 90 Airflow 92 Airflow 94 Airflow

Claims

1. An outdoor energy storage device (40) for a system (2) for regulating the temperature of an interior space (4) of a building (6), in particular for heating, cooling or air conditioning, comprising: The outdoor energy storage device (40) can be installed outside the building (6) and includes at least one energy storage device (14), an air heat exchanger (22), and a device unit (50) in a modular design; The energy storage device (14) is designed to include a liquid reservoir (16) with a water heat exchanger (18) for heat exchange and energy storage; The air heat exchanger (22) surrounds the radial fan (70) at least in a plurality of sections along the outer periphery, whereby an air flow passing through the air heat exchanger (22) is generated from the outside in the radial direction toward the inside, and the air flow is discharged axially upward in the radial fan (70); The device unit (50) is disposed between the energy storage device (14) and the air heat exchanger (22), and has an exhaust connection (56) for the exhaust of the building (6) that distributes the exhaust air flowing in from the building (6) to the device unit (50); An insulator (66) insulates the device unit (50) from the surrounding environment, and exhaust air from the building (6) passes through the device unit (50) and is then introduced by a fan (80) first into the energy storage device (14), and then into the air heat exchanger (22), where heat is recovered at least in the energy storage device (14).

2. 2. The outdoor energy storage device (40) of claim 1, wherein the device unit (50) has at least one heat pump (52) coupled to the water heat exchanger (18) and the air heat exchanger (22) via a connecting plate (76).

3. 2. The outdoor energy storage device (40) according to claim 1, wherein the device unit (50) comprises the energy store (14) and the air heat exchanger (22) with devices necessary for their functioning, and further comprises an energy buffer in the form of a hot water tank (54) for drinking water or non-potable water, or in particular a water tank.

4. The outdoor energy storage device (40) according to claim 1, wherein the device unit (50) is surrounded on its outside by the insulator (62, 62', 68).

5. The outdoor energy storage device (40) of claim 4, wherein the insulator (66) extends from the area of ​​the base plate (82) across the energy storage device (14).

6. The outdoor energy storage device (40) of claim 4, wherein the insulator (66) is circumferentially reinforced by a collar (64).

7. 7. The outdoor energy storage device (40) of claim 6, wherein a portion of the outdoor energy storage device (40) is buried underground (30), and the collar (64) covers a portion of the device unit (50) that is buried underground (30).

8. The outdoor energy storage device (40) according to any one of claims 1 to 7, wherein the device unit (50) has a modular structure, and the interior of the device unit is insulated from the outside air temperature and forms a space that is heated by the exhaust air of the building (6).

9. 8. The outdoor energy storage device (40) according to claim 1, wherein the device unit (50) and the air heat exchanger (22) above the insulator are provided with side covers (58), and the air heat exchanger (22) is provided with a cover (60).

10. 8. The outdoor energy storage device (40) of claim 1, wherein exhaust air from the building (6) flows into the device unit (50) via a piping connection (56) preferably laid underground (30) below the end of the device unit (50).

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