Domestic appliance for a building, method for mounting a domestic appliance and method for operating a domestic appliance

Abstract

The invention relates to a building services appliance (1) with a direct electric heat source (3) for heating the building. The heat source (3) is provided by a flow connection to first medium connections (6) of the building services appliance (1) for supplying a first heat transfer medium at a first temperature, and by a flow connection via a heat exchanger (16) to second medium connections (7) of the building services appliance (1) for supplying a second heat transfer medium, different from the first, at a second temperature. The invention further relates to a method for installing a building services appliance (1) and a method for operating a building services appliance (1).

Description

[0001] The invention relates to a building services appliance with a direct electric heat source for heating the building. The invention further relates to a method for installing a building services appliance and a method for operating a building services appliance.

[0002] For example, the prior art document DE 10 2021 133 807 A1 describes a building services system, in particular an apartment station, with a primary connection including a flow connection, wherein a branch is provided at the flow connection before a first valve, and a heating flow is coupled to the first valve, and a return connection; with a heat exchanger which is coupled to the flow connection via the branch; with an instantaneous water heater for reheating water from the flow connection; and with a hot water pipe as the outlet connection of the apartment station, wherein the hot water pipe is coupled to the instantaneous water heater; and with a temperature sensor in or on the hot water pipe for detecting the temperature of the water in the hot water pipe.

[0003] Furthermore, the document DE 10 2014 225 693 A1 discloses a heating system for heating a building and for heating hot water, which is provided at a tap, comprising a fresh water supply line for supplying cold water, a main heat source, a heat storage unit connected to the main heat source and an auxiliary heat source, wherein the main heat source is intended for heating the building and / or for heating the heat storage unit, wherein the heat storage unit stores hot water or a heated heat transfer medium for heating the hot water storage unit, and wherein the auxiliary heat source is intended for heating the hot water.The system provides that the hot water from the heat storage tank is routed via a second drain line, and that the hot water from the additional heat source is routed via a second drain line with a second valve, with the first drain line and the second drain line being joined at a junction point, from where a hot water line leads the hot water to the tap.

[0004] Further state of the art is revealed in the publications EP 3 015 786 A1, WO 2020 / 016489 A1 and WO 2024 / 023513 A1.

[0005] The object of the invention is to propose a building technology device which has advantages over known building technology devices, in particular for the provision of both heating water and hot water, and which is extremely compact and quick and easy to install.

[0006] This is achieved with a building services device with the features of claim 1. It is provided that the heat source for providing a first heat transfer medium at a first temperature is fluidically connected to first medium connections of the building services device, and for providing a second heat transfer medium different from the first at a second temperature via a heat exchanger, is thermally connected to a second medium connection of the building services device.

[0007] Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are possible.

[0008] The building services unit is designed and intended for installation on or in the building. It can therefore form part of the building, but can also exist separately from the building, particularly until its installation on or in the building. The building services unit has a direct electric heat source, which is powered by electricity, at least intermittently, to heat the building. For example, this heat source may be the only heat source of the building services unit. Alternatively, the building services unit may have several heat sources, at least one of which is a direct electric heat source. Preferably, the building services unit has only direct electric heat sources.

[0009] A direct electric heat source is an electrically operated heat source in which electrical energy is converted into heat and directly supplied to the heat transfer medium, in particular the first heat transfer medium. Preferably, the heat source is in the form of an electric instantaneous water heater. The instantaneous water heater has, for example, a tubular heating element that is electrically heated and through which the first heat transfer medium flows, at least temporarily. Alternatively, the instantaneous water heater is a bare-wire instantaneous water heater in which at least one electrically energized heating wire is at least temporarily surrounded and / or exposed to the first heat transfer medium. The heating wire is thus in direct contact with the heat transfer medium.

[0010] The building services appliance has several medium connections, namely at least the first medium connections and the second medium connections. The building services appliance provides the first heat transfer medium via at least one of the first medium connections. Specifically, the building services appliance receives the first heat transfer medium via one of the first medium connections, heats it using the heat source, and then provides it again at the other of the first medium connections. The first heat transfer medium is provided at the first temperature; therefore, the first heat transfer medium present at one of the first medium connections is at the first temperature.

[0011] The first medium connections are fluidically connected to the heat source; in particular, they are fluidically connected to each other, at least temporarily, via the heat source. The first heat transfer medium thus flows from one of the first medium connections, at least temporarily, via the heat source to the other of the first medium connections. The first heat transfer medium is, for example, heating water, which serves to operate a heating emitter, such as a heating radiator and / or a heating pipe of an underfloor heating system. The heating emitter is located in a heating circuit that also includes the building services equipment, in particular the heat source.

[0012] Furthermore, the building services unit has secondary medium connections. These secondary medium connections, or rather the flow path connecting them, are thermally connected to the heat source via the heat exchanger. This means that heat provided by the heat source is transferred, at least temporarily, via the heat exchanger to the secondary heat transfer medium, which is supplied at at least one of the secondary medium connections or is present in the flow path between the two secondary medium connections. The secondary medium connections are fluidically connected to the heat exchanger; in particular, they are fluidically connected to each other via the flow path running through the heat exchanger.Accordingly, it is intended that the building services equipment receives the second heat transfer medium via one of the second medium connections, heats it by means of the heat source or the heat provided by the heat source and then makes it available at the other of the second medium connections or pumps it out of the building services equipment through it.

[0013] It is important that the flow path between the second medium connections is thermally connected to the heat source via the heat exchanger, but fluidically separated from the heat source. Preferably, both the first heat transfer medium, heated by the heat source, and the second heat transfer medium are supplied to the heat exchanger, so that the heat provided by the heat source is transferred from the first heat transfer medium to the second heat transfer medium within the heat exchanger. The second heat transfer medium is fluidically separated from the first heat transfer medium; consequently, the two heat transfer media do not come into contact with each other.

[0014] The second heat transfer medium is preferably fresh water or drinking water, which can be drawn off in the form of hot water, for example, via at least one tap. In this case, a fresh water pipe or cold water pipe of the building is preferably connected to one of the second medium connections, through which cold fresh water is supplied. A hot water pipe is connected to the other of the second medium connections. At least one water consumer, such as the aforementioned tap, is connected to the second medium connection via the hot water pipe.

[0015] The described design of the domestic hot water unit has the advantage that both the first heat transfer medium, for example, heating water, and the second heat transfer medium, in particular potable water, can be heated, or at least temporarily heated, using the same heat source. The heat source is electrically operated, so that both the heating water and the potable water can be supplied by the unit using only electrical energy; no other energy source is required. In this way, for example, small buildings, so-called tiny houses, can be efficiently supplied with both heating water and potable water. It is also possible to forgo a central heating system in a larger building with multiple units. Instead, a domestic hot water unit as described here is installed in one or more of the units.This eliminates the need for complex piping within the building.

[0016] A further development of the invention provides that the heat source is fluidically connected to the first medium connections via a first flow connection and to the heat exchanger via a second flow connection. Accordingly, the first heat transfer medium, heated by the heat source, can be supplied to the first medium connections, the heat exchanger, or both. This means that the heat source can be used to heat both the first heat transfer medium present at the first medium connections and the first heat transfer medium supplied to the heat exchanger. Such a configuration of the domestic hot water appliance is particularly suitable for providing or heating both heating water and domestic hot water. This achieves the advantages already mentioned.

[0017] A further development of the invention provides that the first medium connections have at least one first inlet connection and at least one first outlet connection, and the second medium connections have a second inlet connection and a second outlet connection. Both the first and second medium connections can be subdivided into inlet connections and outlet connections. The at least one first inlet connection serves to supply the first heat transfer medium into the domestic appliance, and the at least one first outlet connection serves to discharge the first heat transfer medium from the domestic appliance. The first inlet connection and the first outlet connection are fluidically connected via the heat source, so that the first heat transfer medium, flowing from the direction of the first inlet connection towards the first outlet connection, flows through the heat source.

[0018] In principle, any number of first inlet connections and any number of first outlet connections can be present. Preferably, however, there are as many first outlet connections as first inlet connections and vice versa. The first medium connections can comprise just a single first inlet connection and a single first outlet connection, but preferably there are several first inlet connections and several first outlet connections. For example, a heat emitter is fluidically connected to each of the first inlet connections and the first outlet connections.

[0019] The second heat transfer medium is supplied via the second medium connections. Preferably, the building services unit has a single second inlet connection and a single second outlet connection. Fresh water is preferably supplied to the building services unit via the second inlet connection and routed through the heat exchanger to the second outlet connection. Here, it is heated via the first heat transfer medium using the thermal connection between the heat source and the heat exchanger. With the described configuration of the building services unit, it is therefore possible to supply both heating water and potable water.

[0020] A further development of the invention provides that the at least one first inlet connection is located on an inlet manifold fluidically connected to the heat source, and the at least one first outlet connection is located on an outlet manifold fluidically connected to the heat source. The inlet manifold and the outlet manifold serve to connect the at least one first inlet connection and the at least one first outlet connection to the heat source in a fluidically parallel manner. The inlet manifold has an inlet collection chamber into which the first inlet connection, or all first inlet connections, open. Similarly, the outlet manifold has an outlet collection chamber into which the first outlet connection, or all first outlet connections, open.The inlet collection chamber and the outlet collection chamber are each fluidically connected to the heat source; in particular, they are fluidically connected to each other via the heat source.

[0021] Insofar as this description refers to the first inlet connection or the at least one first inlet connection, the explanations are always equivalent. Explanations concerning the at least one first inlet connection are therefore applicable to the first inlet connection, and vice versa. If there are several first inlet connections, the explanations concerning the first inlet connection or the at least one first inlet connection are preferably applicable to each of the several inlet connections. The same applies analogously to the first outlet connection or the at least one first outlet connection. The inlet manifold and the outlet manifold serve to divide the first heat transfer medium into several heating circuits, in particular into several heat emitters.This means that even larger buildings can be heated using the building technology unit.

[0022] A further development of the invention provides that the heat source has a medium inlet and a medium outlet, wherein the first and second flow connections are connected to the medium inlet and the medium outlet in a flow-parallel manner. The first heat transfer medium is supplied to the heat source via the medium inlet. The heat source then provides the heated first heat transfer medium again via the medium outlet. Thus, there is only a single flow connection through the heat source, to which both the first and second flow connections are connected. This enables a particularly compact design for the heat source and therefore for the entire building services device.Due to the parallel flow path of the first and second flow paths to the medium inlet and outlet, the heat source heats both the first heat transfer medium supplied at the first medium connections and the second heat transfer medium present at the second medium connections, at least temporarily. This, in turn, enables the compact design already described.

[0023] A further development of the invention provides that a common circulation pump is present in both the first and second flow connections and that they are fluidically connected to the heat source via a switching valve, or that a first circulation pump is present in the first flow connection and a second circulation pump in the second flow connection. In order to selectively heat either the first heat transfer medium present at the first medium connections or the second heat transfer medium present at the second medium connections using the heat source, it is necessary to supply the first heat transfer medium flowing through the heat source either to the first medium connections or to the heat exchanger.

[0024] In one configuration, the first heat transfer medium is circulated using a shared circulation pump. The switching valve determines whether the first heat transfer medium, heated by the heat source, is supplied to the first medium connections or fed to the heat exchanger to heat the second heat transfer medium. In the first switching position of the switching valve, the circulation pump pumps the first heat transfer medium from one of the first medium connections, specifically the first inlet connection, via the heat source to the other of the first medium connections, specifically the first outlet connection. In the second switching position, the circulation pump pumps the first heat transfer medium from the heat exchanger to the heat source and then pumps the heated first heat transfer medium back to the heat exchanger.

[0025] In a second variant, each of the flow connections has its own separate circulation pump: the first circulation pump in the first flow connection and the second circulation pump in the second. The circulation pumps can be operated independently. When the first circulation pump is operating, the first heat transfer medium is pumped from one of the first medium connections to the heat source and then to the other of the first medium connections. When the second circulation pump is operating, the first heat transfer medium is pumped from the heat exchanger to the heat source and back to the heat exchanger. This allows for the simultaneous heating of the first heat transfer medium at the first medium connections and the second heat transfer medium via the heat exchanger. In either case, this results in particularly flexible operation of the building services unit.

[0026] A further development of the invention provides that the heat source, the first and second flow connections, and the first and second medium connections are arranged on and / or in a common housing of the building services device, particularly in a heating circuit distribution cabinet. The building services device is therefore not a collection of individual elements, but rather these elements are located on or in the housing. This applies at least to the heat source, the flow connections, and the medium connections. Preferably, the flow connections are also arranged in the housing. For example, the housing may be in the form of a heating circuit distribution cabinet. The housing can be designed as a surface-mounted or flush-mounted unit. In any case, it enables simple and quick installation of the building services device and easy integration into a heating circuit.

[0027] A further development of the invention provides that the first heat transfer medium is present in a heating circuit, which is closed, particularly after the intended installation of the building services appliance, and which includes the heat source, the first medium connections, and the heat exchanger. The building services appliance thus has the heating circuit or, after its intended installation on or in the building, at least forms part of it. In particular, the heat source, the first medium connections, and the heat exchanger are components of the heating circuit. Preferably, the heating circuit also includes the heat emitter. For example, the heating circuit is divided into several sub-circuits. For instance, the heat source, the first medium connections, and—preferably—the heat emitter are present in a first sub-circuit. In a second sub-circuit, on the other hand, the heat source and the heat exchanger are arranged.

[0028] As described in this document, the first heat transfer medium can be circulated in the heating circuit, specifically in both sub-circuits, by means of the circulation pump. The first heat transfer medium is divided between the first sub-circuit and / or the second sub-circuit using the switching valve. Alternatively, each sub-circuit can have its own separate circulation pump: the first sub-circuit has its own pump, and the second sub-circuit has its own pump. In either case, flexible operation of the heating system is achieved.

[0029] The invention further relates to a building with a building services unit, in particular with a building services unit as described herein, wherein the building services unit has a direct electric heat source for heating the building. It is provided that the heat source is connected, via a flow connection, to first medium connections of the building services unit for supplying a first heat transfer medium at a first temperature, and, via a heat exchanger, is connected, via a flow connection, to a second medium connection of the building services unit for supplying a second heat transfer medium, different from the first, at a second temperature.

[0030] The advantages of such a design for the building or the building services equipment have already been mentioned. Both the building and the building services equipment can be further developed as explained in this description, and reference is made to that description in that regard.

[0031] Furthermore, the invention relates to a method for mounting a building services appliance, in particular a building services appliance as described in this description, wherein the building services appliance has a direct electric heat source for heating the building. It is provided that the heat source is connected, via a flow connection, to first medium connections of the building services appliance to provide a first heat transfer medium at a first temperature, and, via a heat exchanger, to second medium connections of the building services appliance to provide a second heat transfer medium, different from the first, at a second temperature. Reference is again made to the explanations in this description regarding the advantages and possible advantageous embodiments.

[0032] A further development of the invention provides that a first device module, comprising a housing of the domestic appliance, an inlet distributor having one of the first medium connections, and an outlet distributor having another of the first medium connections, is provided, and subsequently a second device module, comprising the heat source and the heat exchanger, is inserted into the housing. The domestic appliance is thus in modular form and consists of several modules, at least the first and second modules. Both device modules are provided as a single unit; the elements forming the respective device module are attached to or connected with each other.

[0033] The first device module comprises at least the device housing, to which the inlet manifold and the outlet manifold are mounted. For example, the inlet manifold and the outlet manifold are attached to a rear panel of the device housing. After mounting the first device module, which preferably involves attaching the first device module or the device housing to the building or a wall of the building, the second device module is inserted into the device housing. The second device module includes at least the heat source and the heat exchanger. These are supplied as a single unit and are inserted together into the device housing and secured there.

[0034] The heat source is then connected to the first medium connections and the heat exchanger to the second medium connections of the building services unit, ensuring proper flow control. This approach allows the first unit module to be installed during the initial construction phase, while the second module is installed in a later phase. This reliably prevents damage to the heat source and heat exchanger during the initial construction phase.

[0035] A further development of the invention provides that, before the second device module is inserted into the device housing, at least one heat emitter, in particular a heating radiator and / or a heating pipe of an underfloor heating system, is fluidically connected to the inlet manifold and the outlet manifold. Thus, after the first device module has been installed, the emitter is first fluidically connected to the building services device or the first device module. For this purpose, the heat emitter is preferably connected to the inlet manifold and the outlet manifold. Only then is the second device module inserted into the device housing. This achieves the advantages described above.

[0036] The invention also relates to a method for operating a building services appliance, in particular a building services appliance as described in this description, wherein the building services appliance has a direct electric heat source for heating the building. It is provided that the heat source is connected, via a heat exchanger, to first medium connections of the building services appliance for supplying a first heat transfer medium at a first temperature, and, via a heat exchanger, is connected to a second medium connection of the building services appliance for supplying a second heat transfer medium, different from the first, at a second temperature. The heat source is operated, at least temporarily, to heat the first heat transfer medium with a first heating output and, at least temporarily, to heat the second heat transfer medium with a second heating output.

[0037] Both the building services device and the method for operating it can be further developed as explained in this description. The advantages of the described design of the building services device and the method for operating it have also already been discussed in detail.

[0038] The building services unit is designed such that, using the heat source, in particular the unit's sole heat source, both the first and second heat transfer media can be heated, or at least temporarily heated. This is achieved through thermal coupling between the heat source and the second heat transfer medium via the first heat transfer medium and the heat exchanger. The first heat transfer medium, heated by the heat source, is thus fed into the heat exchanger, where it transfers the heat supplied by the heat source to the second heat transfer medium.

[0039] This approach, or design of the building services appliance, eliminates the need for a separate reservoir of the second heat transfer medium within the appliance itself, allowing the appliance to heat the second medium like an instantaneous water heater. If the first heat transfer medium needs to be heated before being supplied to the first medium connections, the heat source operates at its primary heating capacity. Conversely, if the heat source is used to heat the second heat transfer medium, the secondary heating capacity is utilized.

[0040] A further development of the invention provides that the first heat transfer medium is temporarily conveyed between the first medium connections at a first medium flow rate and temporarily supplied to the heat exchanger at a second medium flow rate to heat the second heat transfer medium. Medium flow rate refers to the quantity of the first heat transfer medium per unit of time, for example, a mass flow rate or a volume flow rate. The first medium flow rate occurs when the first heat transfer medium is conveyed from one of the first medium connections via the heat source to the other of the first medium connections.

[0041] The second medium flow rate is used when the first heat transfer medium is circulated between the heat source and the heat exchanger to utilize the heat provided by the heat source to heat the second heat transfer medium. Typically, the second medium flow rate is higher than the first, specifically by an integer factor of at least 2, at least 5, or at least 10. The circulation pump or the pump of the building services equipment is designed and configured to adjust the different medium flow rates. By using the different medium flow rates, targeted heating of both the first and second heat transfer media is possible.

[0042] A further development of the invention provides that, during the conveying of the first heat transfer medium between the first medium connections, the first medium flow rate is set to zero, and during the supply of the second heat transfer medium, the first medium flow rate is set to zero. In other words, the domestic appliance either operates the heating circuit or supplies the second heat transfer medium, in particular hot water. Thus, when the first heat transfer medium is circulated in the heating circuit and conveyed accordingly between the first medium connections, preferably no first heat transfer medium is supplied to the heat exchanger, and the second medium flow rate is zero or at least nearly zero.

[0043] If, however, the heated second heat transfer medium is supplied by pumping the first heat transfer medium between the heat source and the heat exchanger, the first medium flow rate is set to zero or at least nearly zero, and the heating circuit is not operated accordingly. This is usually necessary because the second heat transfer medium must be heated to a temperature higher than that of the first heat transfer medium, which is required to operate the heating circuit. Therefore, the pumping of the first heat transfer medium between the first medium connections and the pumping of the first heat transfer medium between the heat source and the heat exchanger are carried out alternately, and in particular, exclusively alternately. This ensures reliable and safe operation of the building services equipment.

[0044] A further development of the invention provides that the actual temperature of the first heat transfer medium is adjusted to a predetermined first setpoint temperature during the conveying of the first heat transfer medium between the first medium connections, and to a predetermined second setpoint temperature during the supply of the first heat transfer medium. The actual temperature is understood to be, in particular, the temperature of the first heat transfer medium downstream, especially directly downstream, of the heat source, i.e., for example, at the medium outlet through which the first heat transfer medium flows out of the heat source.

[0045] The temperature of the first heat transfer medium, which it must maintain to operate the heating circuit, is typically lower than the temperature at which the building services equipment is intended to supply the second heat transfer medium. Accordingly, the second setpoint temperature is usually higher than the first setpoint temperature, in particular by an integer factor of at least 1.5, at least 2, or at least 2.5, when the temperature is specified in degrees Celsius. Adjusting the actual temperature to the respective setpoint temperature is achieved by selecting the appropriate heating output of the heat source, depending on the medium flow rate. This procedure enables both the operation of the heating circuit and the supply of the second heat transfer medium with a rapid response time.

[0046] A further development of the invention provides that, following the provision of the second heat transfer medium, the first heat transfer medium is conveyed through the first medium connections at an actual temperature exceeding the first target temperature, and / or that the heat source is operated with an excess of electrical energy and the first heat transfer medium is conveyed through the first medium connections at an actual temperature exceeding the first target temperature.

[0047] While the second heat transfer medium is being supplied at the desired temperature, the heat source is operated at the second heating output, and the first heat transfer medium is circulated at the second flow rate, exhibiting an actual temperature that at least temporarily corresponds to the second setpoint temperature. Once the supply of the second heat transfer medium is complete, meaning the building services equipment does not request any further second heat transfer medium, the first heat transfer medium remains at the second setpoint temperature or at least at an actual temperature exceeding the first setpoint temperature. Nevertheless, the first heat transfer medium continues to be circulated through the first medium connections, thus subjecting the heating circuit to the first heat transfer medium at an excessively high temperature.This leads to energy savings, as additional thermal energy is introduced into the heating circuit after each supply of the second heat transfer medium.

[0048] Additionally or alternatively, the system allows for the first heat transfer medium to be fed into the heating circuit at an excessively high temperature if there is a surplus of electrical energy. This surplus can occur, for example, during periods of low electricity prices or when electricity is generated locally on or within the building, such as by a photovoltaic system. In this case, the heat source is also operated, and the heated first heat transfer medium is fed into the heating circuit, even if this is not currently necessary. Significant energy savings can also be achieved using this approach.

[0049] The features and combinations of features described in the description, in particular those described in the following figure description and / or shown in the figures, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention, in particular the scope of the claims. Thus, embodiments that are not explicitly shown or explained in the description and / or the figures, but which emerge from or can be derived from the explained embodiments, particularly within the scope of the claims, are also to be considered as encompassed by the invention.

[0050] The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without limiting the invention. The drawing shows: Figure 1 is a schematic representation of a building services equipment for a building which has a direct electric heat source for heating the building, and Figure 2 is a schematic representation of a hydraulic circuit diagram of the building services equipment and of building equipment connected to the building services equipment.

[0051] The Figure 1Figure 1 shows a schematic representation of a building services appliance 1. The building services appliance 1 has a housing 2, which preferably has the shape of a heating circuit distribution cabinet. A direct electric heat source 3, preferably in the form of an instantaneous water heater, is arranged in the housing 2. The heat source 3 has an inlet connection 4 and an outlet connection 5. A heat transfer medium can be supplied to it via the inlet connection 4, which is heated within the heat source and then made available at the outlet connection 5. First medium connections 6 and second medium connections 7 are also arranged on or in the housing 2.

[0052] The first medium connections 6 have at least one first inlet connection 8 and one first outlet connection 9; the second medium connections 7 have one second inlet connection 10 and one second outlet connection 11. It can be seen that in the illustrated embodiment there are several first inlet connections 8 and several first outlet connections 9. The first inlet connections 8 are arranged on an inlet distributor 12 and the first outlet connections 9 on an outlet distributor 13. For the sake of simplicity, the following will refer to the first inlet connection 8 and the first outlet connection 9.

[0053] In principle, the building services device 1 can, of course, have any number of first inlet connections 8 and any number of first outlet connections 9. The inlet distributor 12 has at least one first inlet connection 8, and the outlet distributor 3 has at least one first outlet connection 9. If this description refers only to one of the first inlet connections 8 or the first outlet connections 9, the statements are always applicable to the multiple first inlet connections 8 and the multiple first outlet connections 9, and in particular to each of them.

[0054] Heat source 3 is fluidically connected to the first medium connections 6. A first heat transfer medium is supplied to the building services unit 1 via the first inlet connection 8, which then flows through heat source 3 and exits the building services unit 1 via the first outlet connection 9. For this purpose, the first inlet connection 8 and the first outlet connection 9 are fluidically connected to each other via a first flow connection 14, which runs through heat source 3. Specifically, the first inlet connection 8, or rather the inlet distributor 12, is fluidically connected to the inlet connection 4 of heat source 3. The outlet connection 5 of heat source 3 is, in turn, fluidly connected to the first outlet connection 9, or rather the outlet distributor 13.In the first flow connection 14, there is also a first circulation pump 15, by means of which the first heat transfer medium is conveyed from the direction of the first inlet connection S8 towards the first outlet connection 9.

[0055] The second medium connections 7, namely the second inlet connection 10 and the second outlet connection 11, are fluidically separated from the heat source 3. They are connected to each other via a flow connection within the building services unit 1. This flow connection is thermally, or heat-transferring, connected to the heat source 3. For this purpose, the building services unit 1 has a heat exchanger 16. This heat exchanger is fluidically connected to the heat source 3 via a second flow connection 17. A medium inlet 18 of the heat exchanger 16 is fluidically connected to the outlet connection 5 of the heat source 3, whereas a medium outlet 19 of the heat exchanger 16 is fluidly connected to the inlet connection 4. Preferably, the heat exchanger 16 is fluidically connected to the heat source 3 in parallel with the first medium connections 6.

[0056] In the second flow path 17, a second circulation pump 20 is preferably present, which is only shown schematically here. Fluidically separated from the medium inlet 18 and the medium outlet 19, the second medium connections 7 are connected to the heat exchanger 16. In this respect, fluidically separated flow paths exist through the heat exchanger 16, whereby the medium inlet 18 and the medium outlet 19 are fluidically connected to each other via a first flow path, whereas the second medium connections 7, i.e., the second inlet connection 10 and the second outlet connection 11, are fluidically connected to each other via a second flow path. The second flow path corresponds to the flow path already mentioned.

[0057] A second heat transfer medium is supplied to the building services unit 1 via one of the second medium connections 7. Specifically, the second heat transfer medium is supplied to the building services unit 1 via the second inlet connection 10 and removed via the second outlet connection 11. Within the building services unit 1, the first and second heat transfer media are completely separated from each other in terms of flow and are only connected to each other thermally, i.e., for heat transfer, via the heat exchanger 16.

[0058] The domestic service unit 1 can operate a heating circuit 21 (not shown in detail here) and also provide heated drinking water, i.e., hot water. To establish the heating circuit 21, at least one heat emitter 22 is fluidically connected to the first medium connections 6. For example, such a heat emitter 22 is fluidically connected to each first inlet connection 8 and each first outlet connection 9. The first heat transfer medium is therefore heating water, which, during operation of the domestic service unit 1, flows at least temporarily from the first outlet connection 9 to the respective heat emitter 22, flows through it, and then returns to the first inlet connection 8.Starting from the first inlet port 8, the first heat transfer medium is conveyed through the heat source 3, namely using the first circulation pump 15, so that it then exits again from the first outlet port 9 in the direction of the heat emitter 22.

[0059] To supply the heated second heat transfer medium, the second circulation pump 20 is operated, at least intermittently. This pump conveys the first heat transfer medium from the outlet port 5 of the heat source 3 through the heat exchanger 16 and back to the inlet port 4 of the heat source 3. As it flows through the heat exchanger 16, the first heat transfer medium, circulated by the second circulation pump 20, transfers heat to the second heat transfer medium, which simultaneously flows from the second inlet port 10 towards the second outlet port 11, thereby passing through the heat exchanger 16.

[0060] It is evident that the building services unit 1 has additional elements besides those already described, such as several valves 23 and several thermometers 24. However, these are only of minor importance for the building services unit 1 described in the context explained, and therefore will not be discussed further. Furthermore, the building services unit 1 has a venting device 25, a connection 26 for an expansion tank, and a connection 27 for a relief line through which the first heat transfer medium is discharged from the building services unit 1 if its pressure exceeds a maximum permissible pressure. Connection 27 is, for example, fluidically connected to the first flow connection 14 via a pressure relief valve.

[0061] The Figure 2Figure 1 shows a schematic diagram of the hydraulic circuit of the building services unit 1 and of the building's fluid-connected equipment. In addition to the building services unit 1, the heating circuit 21 with the heat emitter 22 is also shown. It is also evident that an expansion tank 28 is fluid-connected to connection 26, which is preferably also located in the unit housing 2. A check valve 29 and 30, respectively, are arranged in both the first flow connection 14 and the second flow connection 17. The check valves 29 and 30 each allow the first heat transfer medium to flow towards the inlet connection 4 of the heat source 3 and prevent flow in the opposite direction.

[0062] It is also clearly evident that the flow connections 14 and 17 are connected to the heat source 3 in parallel flow direction. For example, a common inlet line 31 serves this purpose, to which, on the one hand, the first inlet connection 8 is connected via the first circulation pump 15 and the medium outlet 19 via the second circulation pump 20, and on the other hand, the inlet connection 4 of the heat source 3 is connected. A drain line 32 is connected to the outlet connection 5 of the heat source 3, and on its side facing away from the heat source 3, this drain line is connected in parallel flow direction to the first outlet connection 9 and to the medium inlet 18 of the heat exchanger 16. The building services unit 1 also has a filter 33, which is arranged in the inlet line 31, i.e., upstream of the heat source 3.

[0063] The building services unit 1 has a control unit 34 for controlling the heat source 3 and the circulation pumps 15 and 20. This control unit is connected, either electronically or electrically, to at least a first temperature sensor 35, a second temperature sensor 36, and a flow sensor 37. The first temperature sensor 35 measures the temperature of the first heat transfer medium downstream of the heat source 3, i.e., in terms of flow, between the outlet connection 5 on the one hand and the first outlet connection 9 and the medium inlet 18 on the other. The second temperature sensor 36 measures the temperature of the second heat transfer medium downstream of the heat exchanger 16, and the flow sensor 37 measures the flow rate of the second heat transfer medium through the heat exchanger 16.

[0064] Furthermore, it is evident that an outlet connection 38 is fluidically connected to the second inlet connection 10, in particular parallel to the heat exchanger 16. The outlet connection 38 can also be located on or in the device housing 2; however, it is preferably arranged away from the domestic service unit 1. While the second outlet connection 11 serves to supply a water consumer, for example a tap, with a second heat transfer medium heated by the heat source 3, the second heat transfer medium is provided at a controlled temperature at the outlet connection 38.

[0065] The control unit 34 is designed to control the circulation pumps 15 and 20, as well as the heat source 3, based on readings from the temperature sensors 35 and 36 and the flow sensor 37. For example, in a first operating mode of the building services unit 1, the first circulation pump 15 is activated and the second circulation pump 20 is deactivated. The heat source 3 is controlled such that the actual temperature of the first heat transfer medium, measured by the first temperature sensor 35 downstream of the heat source 3, corresponds to a first target temperature. The first heat transfer medium is circulated by the first circulation pump 15 through the heating circuit 21 and, in particular, through the heat emitter 22. In a second operating mode, both the first circulation pump 15 and the second circulation pump 20 are deactivated. In a third operating mode, however, the first circulation pump 15 is deactivated and the second circulation pump 20 is activated.The heat source 3 is controlled such that the actual temperature measured by the first temperature sensor 35 corresponds to a second actual temperature. The first heat transfer medium is pumped by the second circulation pump 20 through the heat exchanger 16, where it transfers heat to the second heat transfer medium.

[0066] Preferably, the building services unit 1 is operated in either the first or second operating mode, depending on a basic operating mode. If the basic operating mode corresponds to winter operation, the first operating mode is used; if it corresponds to summer operation, the second operating mode is used. If, in the first or second operating mode, the flow rate of the second heat transfer medium through the heat exchanger 16, measured by the flow sensor 37, is not zero (i.e., there is a flow rate of the second heat transfer medium through the heat exchanger 16), the unit switches to the third operating mode. Preferably, in the third operating mode, the second setpoint temperature is adjusted until the temperature of the second heat transfer medium, measured by the second temperature sensor 36, corresponds to a preset temperature.

[0067] The described building services unit 1, with its very compact design, enables the supply of both heating water and domestic hot water to a building. It is easy to install, for example, by placing it in a niche or cabinet. It can also be installed during the building's shell construction phase. In this case, installation is preferably carried out in several stages, for which the building services unit 1 is divided into several modules. Furthermore, the combined supply of heating water and domestic hot water allows for synergistic effects; for example, the heat generated after the domestic hot water supply can be directly fed into the heating circuit 21, even if it currently has no heat demand. This significantly improves the efficiency of the building services unit 1. REFERENCE MARK LIST

[0068] 1. Domestic appliance 2. Appliance housing 3. Heat source 4. Inlet connection 5. Outlet connection 6. Medium connection 7. Medium connection 8. Inlet connection 9. Outlet connection 10. Inlet connection 11. Outlet connection 12. Inlet distributor 13. Outlet distributor 14. Flow connection 15. Circulating pump 16. Heat exchanger 17. Flow connection 18. Medium inlet 19. Medium outlet 20. Circulating pump 21. Heating circuit 22. Heat emitter 23. Valves 24. Thermometer 25. Venting device 26. Connection 27. Connection 28. Expansion tank 29. Check valve 30. Check valve 31. Supply line 32. Drain line 33. Filter 34. Control unit 35. Temperature sensor 36. Temperature sensor 37. Flow sensor 38 Outlet connection

Claims

1. Building services appliance (1) for a building, comprising a direct electric heat source (3) for heating the building, characterized by the fact that The heat source (3) is connected to the first medium connections (6) of the building services equipment (1) via a flow connection to provide a first heat transfer medium at a first temperature and to a second medium connection (7) of the building services equipment (1) via a heat exchanger (16) via a flow connection connecting the two medium connections.

2. Home technology device according to claim 1, characterized by the fact that The heat source (3) is connected via a first flow connection (14) to the first medium connections (6) and via a second flow connection (17) to the heat exchanger (16) in a fluid-technical manner.

3. Home technology device according to one of the preceding claims, characterized by the fact thatthe first medium connections (6) have at least one first inlet connection (8) and at least one first outlet connection (9) and the second medium connections (7) have a second inlet connection (10) and a second outlet connection (11).

4. Home technology device according to one of the preceding claims, characterized by the fact that where at least one first inlet connection (8) is provided on an inlet distributor (12) which is fluidly connected to the heat source (3) and at least one first outlet connection (9) is provided on an outlet distributor (13) which is fluidly connected to the heat source (3).

5. Home technology device according to one of the preceding claims, characterized by the fact that the heat source (3) has a medium inlet (18) and a medium outlet (19), wherein the first flow connection (14) and the second flow connection (17) are connected to the medium inlet (18) and the medium outlet (19) in a flow-technically parallel manner to each other.

6. Home technology device according to one of the preceding claims, characterized by the fact that a common circulation pump is present in the first flow connection (14) and in the second flow connection (17) and they are fluidically connected to the heat source (3) via a switching valve, or that a first circulation pump (15) is present in the first flow connection (14) and a second circulation pump (20) is present in the second flow connection (17).

7. Home technology device according to one of the preceding claims, characterized by the fact that the heat source (3), the first flow connection (14) and the second flow connection (17) as well as the first medium connections (6) and the second medium connections (7) are arranged on and / or in a common device housing (2) of the building technology device (1).

8. Home technology device according to one of the preceding claims, characterized by the fact thatthe first heat transfer medium in a heating circuit (21) which contains the heat source (3), the first medium connections (6) and the heat exchanger (16).

9. Method for mounting a building technology device (1) for a building, in particular a building technology device (1) according to one or more of the preceding claims, wherein the building technology device (1) has a direct electric heat source (3) for heating the building, characterized by the fact that The heat source (3) is connected to the first medium connections (6) of the building services equipment (1) via a flow connection to provide a first heat transfer medium at a first temperature and to a second medium connection (7) of the building services equipment (1) via a heat exchanger (16) via a flow connection connecting the two medium connections.

10. Method according to claim 9, characterized by the fact thata first device module, which has a device housing (2) of the building technology device (1) as well as an inlet distributor (12) having one of the first medium connections (6) and an outlet distributor (13) having another of the first medium connections (6), is provided and subsequently a second device module, which has the heat source (3) and the heat exchanger (16), is inserted into the device housing (2).

11. Method for operating a building technology device (1) for a building, in particular a building technology device (1) according to one or more of the preceding claims, wherein the building technology device (1) has a direct electric heat source (3) for heating the building, characterized by the fact thatThe heat source (3) is connected to the first medium connections (6) of the building services equipment (1) via a flow connection connecting a heat exchanger (16) to a second medium connection (7) of the building services equipment (1) for the provision of a first heat transfer medium at a first temperature and for the provision of a second heat transfer medium different from the first heat transfer medium at a second temperature, wherein the heat source (3) is operated at least temporarily with a first heating power to heat the first heat transfer medium and at least temporarily with a second heating power to heat the second heat transfer medium.

12. Method according to claim 11, characterized by the fact thatThe first heat transfer medium is temporarily conveyed with a first medium flow rate between the first medium connections (6) and temporarily supplied with a second medium flow rate to the heat exchanger (16) to heat the second heat transfer medium.

13. Method according to any one of the preceding claims, characterized by the fact that During the conveying of the first heat transfer medium between the first medium connections (6), the second medium flow rate is set to zero, and during the provision of the second heat transfer medium, the first medium flow rate is set to zero.

14. Method according to any one of the preceding claims, characterized by the fact that The actual temperature of the first heat transfer medium is set to a predetermined first setpoint temperature during the conveying of the first heat transfer medium between the first medium connections (6) and to a predetermined second setpoint temperature during the provision of the second heat transfer medium.

15. Method according to any one of the preceding claims, characterized by the fact that Following the provision of the second heat transfer medium, the first heat transfer medium is conveyed through the first medium connections (6) at an actual temperature exceeding the first target temperature, and / or the heat source is operated with an excess of electrical energy and the first heat transfer medium is conveyed through the first medium connections (6) at an actual temperature exceeding the first target temperature.

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