Power engine and assembly kit

Abstract

The invention relates to a combined heat and power engine, in particular a building heat pump, with at least one heat exchanger (10a; 10b; 10c; 10d), and with at least one fan (12a; 12b; 12c; 12d) which is configured to provide an airflow for heat transfer at the heat exchanger (10a; 10b; 10c; 10d). It is proposed that the fan (12a; 12b; 12c; 12d) be designed as a radial fan.

Description

Prior ArtA combined cycle power machine has already been proposed, having at least one heat exchanger, and having at least one fan which is configured to provide an air flow for a heat transfer at the heat exchanger.Disclosure of the InventionThe invention is based on a power heating machine, in particular a building heat pump, having at least one heat exchanger, and having at least one fan which is configured to provide an air flow for a heat transfer at the heat exchanger.It is proposed that the fan is designed as a radial fan.The configuration of the combined heat machine according to the invention advantageously makes it possible to provide high flexibility / modularity, since in particular a combined heat machine with a particularly small width and with a variable arrangement of an air inlet opening and / or air outlet opening can be achieved. A construction with low costs can be provided advantageously, since manufacturing and development costs and planning costs can be saved in particular by the modularity. Advantageously, a high level of operating comfort can be provided, since a low level of noise is achieved, in particular, by using the radial fan. Advantageously, a high power / efficiency can be provided, since in particular radial fans have a low flow resistance.The power heating machine is preferably designed as a building heat pump, in particular an air / water heat pump, which is configured to temperature control, preferably heat and / or cool, an interior. The power heating machine is preferably configured to be fastened to a wall, in particular a house wall. In particular, the power heating machine is configured for operation in an external environment or in an interior space. It is conceivable for the power heating machine to be fastened to the house wall via a fastening unit. Alternatively, the power heating machine could also be set up / fastened on a base via the fastening unit. The power heating machine is preferably configured to draw heat from an environment and / or to release heat to the environment. The environment is preferably designed as an ambient air.The radial fan preferably has at least one rotor. Preferably, the rotor rotates about a rotational axis in operation. Preferably, the axis of rotation is arranged at least substantially parallel to a horizontal direction. The radial fan is preferably configured to generate an air flow. Preferably, the air flow is formed by the ambient air. The radial fan is preferably configured to deflect the air flow at least substantially by 90°. The radial fan preferably has at least one suction opening which is arranged at least substantially perpendicular to the axis of rotation of the radial fan. In particular, a main extension plane of the suction opening is arranged at least substantially perpendicular to the axis of rotation of the radial fan. The radial fan preferably has at least one outlet opening which is arranged at least substantially parallel to the axis of rotation. In particular, a main extension plane of the outlet opening is arranged at least substantially parallel to the axis of rotation of the radial fan. In particular, the outlet opening is arranged at a distance from the axis of rotation. The radial fan preferably generates a negative pressure at the intake opening, which draws in the ambient air axially, in particular parallel to the axis of rotation of the radial fan, and blows it out radially, in particular perpendicularly to the axis of rotation of the radial fan.A "radial fan" is to be understood here in particular as a turbomachine which draws in a gas, preferably air, at least substantially parallel to an axis of rotation of a rotor and compresses it radially to an axis of rotation of the rotor. A "negative pressure" is to be understood here in particular as a fluid pressure which is lower than the ambient air pressure. "At least substantially" is to be understood in this context in particular as meaning that a deviation from a predefined value deviates in particular by less than 25%, preferably by less than 10% and particularly preferably by less than 5% of the predefined value. A "main extension plane" of a structural unit is to be understood in particular as a plane which is parallel to a largest side surface of a smallest imaginary cuboid which just still completely encloses the structural unit and in particular runs through the center point of the cuboid.The power heating machine preferably has at least one, in particular closed, refrigerant circuit. The refrigerant circuit preferably comprises at least one refrigerant. The refrigerant circuit preferably has at least one refrigerant pump which is configured to circulate the refrigerant. The heat exchanger is preferably configured to emit a thermal energy from the refrigerant to the air flow and / or to transfer a thermal energy from the air flow to the refrigerant. The power heating machine preferably has a housing. Preferably, the housing is at least substantially rectangular. The housing is preferably formed from at least one sheet metal component. For example, at least two side surfaces could be formed from a sheet metal component, in particular a formed sheet metal component. It is conceivable that one of the, in particular six, side surfaces is designed as a sheet metal component. Alternatively, the housing could also be formed from at least one plastic component, a composite material, a casting material or a comparable material.Furthermore, a power heating machine is proposed having at least one air inlet opening, which is arranged at least substantially perpendicular to an air outlet opening. Advantageously, a high flexibility can be provided, since in particular due to the air inlet opening arranged perpendicular to the air outlet opening, the power heating machine can also be arranged directly on a wall, in particular in a corner of the wall. Advantageously, a high degree of efficiency can be provided, since in particular the air inlet opening arranged perpendicular to the air outlet opening has a low air flow resistance. Preferably, the at least one air inlet opening and / or the at least one air outlet opening is arranged in the housing. Preferably, the housing delimits the air inlet opening and the air outlet opening along a circumference of the air inlet opening and / or of the air outlet opening. Preferably, the air inlet opening and / or the air outlet opening is designed as an opening cross-sectional area. Preferably, the opening cross-sectional area is completely, in particular circumferentially, bounded by a housing and / or a comparable component. Preferably, the air inlet opening and / or the air outlet opening is at least substantially planar. The air inlet opening preferably has a main extension plane which is arranged at least substantially perpendicular to a main extension plane of the air outlet opening. The main extension plane of the air inlet opening is preferably arranged at least substantially parallel to a main extension plane of the suction opening of the radial fan and / or at least substantially perpendicular to an, in particular central, air flow suction direction at the suction opening of the radial fan. The air outlet opening is preferably arranged at least substantially parallel to a main extension plane of the outlet opening of the radial fan and / or perpendicular to an, in particular central, air flow outlet direction of the radial fan. Preferably, the air inlet opening is configured to provide ambient air. For example, the air inlet opening and / or the air outlet opening is designed as an interface of the power heating machine to the environment. It is conceivable that the air inlet opening and / or the air outlet opening have at least one filter. It is conceivable for the air inlet opening and / or the air outlet opening to have a mechanical protection, such as a grid. A "mean flow direction" is to be understood here in particular as a main flow direction, preferably neglecting flow vortices, which is formed by averaging all flow direction components. An "opening" is to be understood here in particular as a boundary surface, preferably an inlet and / or outlet surface, of a recess arranged in a body.In addition, a power heating machine is proposed having at least one air inlet opening which is arranged at least substantially parallel to an air outlet opening. Advantageously, low costs can be provided, since a standard housing can be used in particular by the air inlet opening arranged at least substantially parallel to the air outlet opening. Advantageously, a high flexibility can be provided, since in particular by means of the air inlet opening arranged parallel to the air outlet opening, an additional possibility of the variable arrangement of the air inlet and / or air outlet opening can be provided. Preferably, the main extension plane of the air inlet opening is arranged at least substantially parallel to a main extension plane of the air outlet opening. Preferably, the air inlet opening is arranged on a side of the air outlet opening opposite the fan. Preferably, the air outlet opening is arranged at a distance from the air inlet opening. It is conceivable for the air inlet opening to be arranged on a housing component which is configured differently from a further housing component which has the air outlet opening. Preferably, the air inlet opening is arranged at least substantially congruently with the air outlet opening in a main extension plane of the air inlet opening. It is conceivable that the air inlet opening is arranged at least partially congruently with the air outlet opening in a main extension plane of the air inlet opening, for example slightly offset relative to one another and / or with a surface of different size. Preferably, the air inlet opening is arranged overlapping the air outlet opening. Preferably, the air outlet opening is at least substantially the same size or smaller than the air inlet opening.Furthermore, it is proposed that the air inlet opening and the air outlet opening are arranged in a common plane. Advantageously, a particularly high flexibility can be provided, since, in particular, by arranging the air inlet opening and the air outlet opening in the common plane, the power heating machine can also be installed in recesses which are only open to one side. Preferably, the air outlet opening is arranged next to the air inlet opening. Preferably, the air outlet opening is arranged at a distance from the air inlet opening. It is conceivable that the air inlet opening and / or the air outlet opening are connected to a ventilation system. For example, the air inlet opening could be connected, preferably in a fluid-tight manner, to an air supply hollow body. For example, the air outlet opening could be connected, preferably in a fluid-tight manner, to an air discharge hollow body. The air supply hollow body and / or the air discharge hollow body could be designed, for example, as a tube, shaft, hose, channel or a comparable hollow profile. In particular, the air supply hollow body / air discharge hollow body is configured for operation of the power heating machine in an interior space.Moreover, it is proposed that the heat exchanger is arranged between the air inlet opening and the radial fan. Advantageously, a high degree of efficiency can be provided, since in particular a particularly high heat transfer can be provided by the arrangement of the heat exchanger between the air inlet opening and the radial fan. Preferably, the radial fan generates a negative pressure which is configured to suck in ambient air and to provide an air flow through the heat exchanger. Preferably, the heat exchanger is arranged between the air inlet opening and the suction opening of the radial fan. In particular, the heat exchanger contacts the radial fan. It is conceivable for the radial fan to have a suction element which is connected to the heat exchanger, in particular in a fluid-tight manner. For example, the heat exchanger is configured for heat transfer according to a cross-flow principle. It is conceivable that the heat exchanger is configured for the heat transfer according to a co-current or counter-current principle.It is also proposed that the heat exchanger has a main air flow direction which has a smallest angle to a rotational axis of the radial fan. Advantageously, a high degree of efficiency can be provided, since in particular the air flows through a larger surface by the main air flow direction arranged at an angle to the axis of rotation. Advantageously, a particularly high flexibility / modularity can be provided, since in particular the main air flow direction arranged at an angle to the axis of rotation enables an arrangement of the air inlet opening on at least two sides. Preferably, the heat exchanger has an air flow inlet opening and an air flow outlet opening. In particular, the air flow inlet opening is at least substantially the same size as the air flow outlet opening. In particular, the air flow inlet opening and / or the air flow outlet opening is at least substantially rectangular. Preferably, the air flow inlet opening is formed at least substantially parallel to the air flow outlet opening. Preferably, the main air flow direction is arranged at least substantially perpendicular to the air flow inlet opening and the air flow outlet opening, in particular at least substantially perpendicular to a main extension plane of the air flow inlet opening and / or the air flow outlet opening of the heat exchanger, preferably a main extension plane of the heat exchanger. Preferably, the heat exchanger is configured to transfer a thermal energy along a temperature gradient between the coolant and the air flow. The heat exchanger is preferably formed from a metallic material. In particular, the smallest angle between the main air flow direction and the axis of rotation of the radial fan has a value of in particular at least 5°, preferably at least 10° and preferably approximately 20°. Preferably, the smallest angle is in a range of 5° to 35°. Preferably, the smallest angle has a value of less than 45°. An "air main flow direction" is to be understood here in particular as a mean flow direction of the air flow which flows through the heat exchanger for a heat transfer. In particular, the main air flow direction is oriented at least substantially perpendicular to the main extension plane of the air flow inlet opening and / or the air flow outlet opening of the heat exchanger.In addition, a power heating machine with at least one air flow guide element is proposed, which at least partially forms an intake duct between the air inlet opening and the heat exchanger. Advantageously, a high degree of efficiency can be provided, since particularly low flow losses can be provided in particular by the formation of an intake duct. The air flow guide element is preferably configured to provide the ambient air at the air flow inlet opening, preferably in a uniformly distributed manner. The air flow guide element is preferably designed as a preferably removable insert which is configured to guide an air flow. Preferably, the flow guide element contacts the heat exchanger, in particular at least along an edge of the heat exchanger. For example, the air flow guide element is configured to prevent dead space and / or air turbulences of the air flow. The air flow guide element preferably has a wedge shape and / or is formed so as to taper. It is conceivable that the intake channel is formed at least partially by the housing.It is furthermore proposed that the air flow guide element has a concave shape in the intake duct. Advantageously, a particularly high degree of efficiency can be provided, since in particular a particularly good air flow guidance can be provided by the concave shape of the air flow guide element. Preferably, the concave shape is formed as a cylinder. Alternatively, the concave shape could also be formed as a ball. Alternatively, the air flow guiding element could also have a convex shape. Further forms of the air flow guide element that appear expedient to the person skilled in the art are conceivable. It is conceivable for the air flow guide element to form at least partially two, in particular concave, intake ducts.It is furthermore proposed that the shape of the air inlet opening is formed at least substantially by the shape of the air flow guide element. Advantageously, a high degree of efficiency can be provided, since particularly low flow losses are achieved in particular by the shape of the air inlet opening formed by the shape of the air flow guide element. Preferably, the air flow guiding element forms the air inlet opening at least partially. The power heating machine preferably has at least one air supply hollow body which is formed at least substantially identically in shape to the air inlet opening formed by the air flow guide element. It is conceivable for the hollow air supply body to have a connecting element which is designed to have the same shape as the air inlet opening formed by the air flow guide element. Alternatively or additionally, the power heating machine could have at least one air discharge hollow body which is configured to discharge the air stream into an environment. Preferably, the hollow air discharge body is designed identically in shape to the air outlet opening. It is conceivable for the hollow air discharge body to have a further connection element which is designed to have the same shape as the air outlet opening.In addition, it is proposed that the air inlet opening and / or the air outlet opening are at least substantially semicircular / semi-elliptical. Advantageously, a high degree of efficiency can be provided, since in particular the semi-circular / semi-elliptical shape is defined by the shape of the air flow guiding element and as a result flow losses are minimal.Furthermore, a power heating machine is proposed, which has at least one insert module, which has at least one first insert element, which at least partially delimits the air inlet opening, and which has at least one further insert element, which at least partially delimits the air outlet opening. Advantageously, a low assembly complexity can be provided, since in particular the air inlet opening and the air outlet opening can be limited with only one insert module. Advantageously, a particularly high flexibility can be provided, since in particular the insert module can be used in modular fashion for different embodiments. Preferably, the first insert element is configured to at least partially form the intake duct. Preferably, the further insert element is configured to at least partially form the outlet channel. The insert module is preferably configured to enable a combination with different housings, in particular different housing sizes and / or housing shapes. The insert module is preferably formed in one piece. In particular, the insert module separates the intake channel and an exhaust channel from one another. Preferably, the insert module is arranged / fastened in a form-fitting manner in the housing.The power heating machine is preferably at least partially designed as an assembly kit which has at least different housings, with different air inlet openings and / or air outlet openings, which has at least different air flow guide elements, and which has at least different insert modules which can be combined with different housings and different flow guide elements. Advantageously, a high flexibility can be provided, since in particular the power heating machine can be assembled from prefabricated components. The combined cycle machine preferably has further components of the refrigeration circuit, such as, for example, compressors, throttle valves, further heat exchangers, valves or further components which appear expedient to the person skilled in the art and are preferably arranged in the insert module. It is conceivable for the further components of the refrigeration circuit to be arranged partially in the insert module. Preferably, the components of the assembly kit are matched to one another and can be combined with one another. The assembly kit is preferably designed to adapt the power heating machine flexibly to local circumstances. For example, from a plurality of different housings with different air inlet and air outlet openings, the embodiment can be selected which is as well suited as possible for a predefined installation space. For example, the assembly kit contains different insert modules, which make possible a combination with different exemplary embodiments, in particular different housings. Furthermore, the air inlet opening and / or the air outlet opening could be combined with different connection elements and combined / connectable with different air discharge hollow bodies and / or air supply hollow bodies.The heat engine according to the invention and the assembly kit according to the invention should not be limited to the application and embodiment described above. In particular, the heat engine according to the invention and the assembly kit according to the invention can have a number which differs from a number of individual elements, components and units and method steps mentioned herein in order to fulfil a mode of operation described herein. In addition, in the value ranges specified in this disclosure, values lying within the stated limits should also be considered as disclosed and usable as desired.DRAWINGFurther advantages are evident from the following description of the drawings. Four exemplary embodiments of the invention are shown in the drawing. The drawings, specification and claims contain numerous features in combination. The skilled person will expediently also consider the features individually and summarize them to form meaningful further combinations.The following are shown: FIG. 1 shows a combined cycle power machine with a radial fan and with a heat exchanger, FIG. 2 shows a housing of the power heating machine with an air inlet opening, with an air outlet opening and with an intake duct, FIG. 3 shows an alternative power heating machine with an alternative arrangement of the air inlet opening, FIG. 4 shows an alternative power heating machine with an alternative shape of the air inlet opening, and FIG. 5 shows an alternative power heating machine with an air supply hollow body and with an air discharge hollow body and connection elements.DESCRIPTION OF THE EMBODIMENTSFIG. 1 shows a schematic illustration of a power heating machine. The power heating machine is designed as a building heat pump. The power heating machine is operable as an air conditioning system and / or as a heater. The power heating machine is configured to draw thermal energy from an air stream and / or to emit thermal energy to an air stream. The air flow is formed by a moving ambient air. The power heating machine has a refrigerant circuit. A refrigerant is arranged in the refrigerant circuit. The refrigerant is configured for circulation in the refrigerant circuit. For this purpose, the refrigerant circuit could comprise further components, such as a compressor, a condenser, an evaporator, valves or the like. The combined cycle engine has a heat exchanger 10a. The heat exchanger 10 ais formed from a metallic material. The material of the heat exchanger 10a has a high thermal conductivity. The heat exchanger 10 ais configured to transfer heat along a temperature gradient between the air flow and the refrigerant. The power heating machine has a fan 12 a. The fan 12 ais designed as a radial fan. The fan 12 ais configured to provide the air flow for heat transfer at the heat exchanger 10 a. The heat exchanger 10a has a main air flow direction 20a. The fan 12 aincludes a rotor. The rotor has a rotation axis 22 a. The rotor rotates about the rotation axis 22 ain operation. The main air flow direction 20 ais arranged at an angle to a rotation axis 22 aof the fan 12 a. The rotation axis 22 aand the main air flow direction 20 ahave a smallest angle 52 a. The smallest angle 52a is about 20°. Alternatively, the smallest angle 52 acan also be smaller or larger than 20°. Alternatively, the smallest angle 52a is greater than 5° and less than 35°. The fan 12a has a suction opening 42a. The suction opening 42 ais arranged perpendicular to the rotation axis 22 a. The fan 12a has an outlet opening 44a. The outlet opening 44 ais arranged parallel to the axis of rotation 22 a.The power heating machine has an air inlet port 14a. The air inlet opening 14 ais configured to provide the ambient air. The air inlet opening 14a has a main extension plane. The main extension plane of the air inlet opening 14 ais arranged parallel to the suction opening 42 a. The power heating machine has an intake passage 26 a. The intake passage 26a connects the air inlet port 14a with an air flow inlet port 38a of the heat exchanger 10a. The heat exchanger 10a is disposed between the air inlet port 14a and the fan 12a. The heat exchanger 10a has an air flow outlet opening 40a. The air flow outlet opening 40 afaces the suction opening 42 aof the fan 12 a. The air flow outlet opening 40 ais fluidically connected to the suction opening 42 aof the fan 12 a. The power heating machine has an insert module 32 a. The insert module 32a has a first insert element 34a. The first insert element 34 ais configured to partially delimit the air inlet opening 14 a. The first insert element 34 ais configured to partially delimit the intake duct 26 a. The power heating machine has an air outlet opening 16 a. The air outlet opening 16 ais configured to discharge the air flow generated by the fan 12 ato the environment. The insert module 32a has a further insert element 36a. The further insert element 36 ais configured to partially delimit the air outlet opening 16 a. The insert module 32 ais designed as an inlet which is designed differently for different housing sizes.FIG. 2 shows a further schematic illustration of the power heating machine. The combined cycle engine includes a housing 50a. The housing 50 aincludes a first housing member 62 a. The first housing element 62 ais formed as a bent sheet metal component. The first housing member 62a forms the housing 50a on two sides. The first housing member 62a circumferentially defines the air inlet opening 14a. The housing 50a has further housing elements. The air inlet port 14a is formed in a rectangular shape. The housing member 62a defines the air outlet port 16a. The air outlet opening 16a is rectangular. The air outlet opening 16 ais arranged parallel to the rotation axis 22 a. The air inlet port 14a is arranged perpendicular to the air outlet port 16a. The air inlet port 14a is disposed in parallel with the suction port 42a of the fan 12a. The air flow at the air inlet opening 14 ais arranged parallel to the rotation axis 22 aof the fan 12 a. A direction of the air flow at the air outlet opening 16 ais arranged perpendicular to the rotation axis 22 a. The air inlet port 14a has an air flow suction direction 46a. The air outlet opening 16 ahas an air flow outlet direction 48 a. The air flow suction direction 46 ais arranged perpendicular to the air flow discharge direction 48 a. The housing 50 ais configured to partially delimit the intake duct 26 a. The intake duct 26a has a main extension plane. The intake duct 26a has a rectangular shape in the main extension plane. The intake passage 26a is usable with various arrangements of the air intake port 14a. It is conceivable that the air inlet opening 14 ais arranged parallel and / or perpendicular to the axis of rotation 22 aof the rotor of the fan 12 a. In the embodiment shown, the intake duct 26 ais formed free of additional air flow guide elements 24 a. Alternatively, an air flow guide element 24 acan be arranged in the intake duct 26 aand / or be partially or completely delimited by an air flow guide element 24 a.FIGS. 3 to 5 show further exemplary embodiments of the invention. The following descriptions and the drawings are limited substantially to the differences between the exemplary embodiments, wherein with regard to identically denoted components, in particular with regard to components with the same reference numerals, reference can in principle also be made to the drawings and / or the description of the other exemplary embodiments, in particular to FIGS. 1 and 2. To distinguish between the exemplary embodiments, the letter a is appended to the reference numerals of the exemplary embodiment in FIGS. 1 and 2. In the exemplary embodiments of FIGS. 3 to 5, the letter a is replaced by the letters b to d.FIG. 3 shows an alternative power heating machine. The alternative combined heat machine has an alternative housing 50b. The alternative housing 50b includes an alternative first housing member 62b. The alternative combined cycle power machine has a heat exchanger 10b. The alternative combined cycle electric power machine has an air inlet port 14b. The alternative power heating machine has an air outlet opening 16 b. The air inlet port 14 bis disposed parallel to the air outlet port 16 b. The air inlet opening 14 band the air outlet opening 16 bare arranged offset with respect to one another. The air inlet opening 14 band the air outlet opening 16 bare arranged at a distance from one another. The air inlet opening 14 band the air outlet opening 16 bare arranged in a same plane 18 b. The air inlet port 14 band the air outlet port 16 bare disposed in the first housing member 62 bof the housing 50 b. The air inlet opening 14 bis completely bordered / bounded by the first housing element 62 bof the housing 50 b. The air outlet opening 16 bis completely bordered / bounded by the first housing element 62 bof the housing 50 b. Alternatively, the air inlet port 14 band the air outlet port 16 bmay be arranged in two different planes from each other. For example, the air inlet port 14b could be located in a front or upper plane and the air outlet port 16b could be located in a rear or lower plane. Alternatively, it is conceivable that the air inlet opening 14 band the air outlet opening 16 bare arranged congruently with one another. Alternatively, it is conceivable that the air inlet opening 14 band the air outlet opening 16 bare arranged partially overlapping with each other. The power heating machine includes an air flow guide member 24 b. The air flow guide member 24 bconstitutes an intake passage 26 bbetween the air inlet port 14 band the heat exchanger 10 b. The air flow guide member 24 bhas a curved shape 28 bin the intake passage 26 b. A shape 30 bof the air inlet opening 14 bis formed by the shape 28 bof the air flow guide member 24 b. The air inlet port 14 bhas a rectangular shape.FIG. 4 shows an alternative power heating machine. The alternative combined heat machine has an alternative housing 50c. The alternative housing 50c includes an alternative first housing member 62c. The alternative combined cycle power machine includes a heat exchanger 10c. The alternative combined cycle electric power machine has an air inlet port 14c. The alternative power heating machine has an air outlet opening 16c. The air inlet port 14c is disposed in parallel with the air outlet port 16c. The air inlet opening 14 cand the air outlet opening 16 care arranged offset with respect to one another. The air inlet opening 14 cand the air outlet opening 16 care arranged at a distance from one another. The air inlet opening 14 cand the air outlet opening 16 care arranged in a same plane 18 c. The air inlet port 14 cand the air outlet port 16 care disposed in the first housing member 62 cof the housing 50 c. The air inlet opening 14 cis completely bordered / bounded by the first housing element 62 cof the housing 50 c. The air outlet opening 16 cis completely bordered / bounded by the first housing element 62 cof the housing 50 c. The power heating machine includes an air flow guide member 24c. The air flow guide member 24c forms an intake passage 26c between the air inlet port 14c and the heat exchanger 10c. The air flow guide member 24c has a concave shape 28c in the intake passage 26. A shape 30 cof the air inlet opening 14 cis formed by the shape 28 cof the air flow guide member 24 c. The air inlet port 14c is formed semi-circular / semi-elliptical. The air outlet opening 16 cis rectangular. However, it is conceivable for the air outlet opening 16 cto also be embodied in a semicircular / semi-elliptical manner. The air flow guide member 24c contacts the heat exchanger 10c at three edges of the heat exchanger 10c. The intake passage 26 cis formed entirely by the flow guide member 24 c.FIG. 5 shows an alternative power heating machine. The alternative combined heat machine has an alternative housing 50d. The alternative combined cycle electric power machine has an air inlet port 14d. The alternative power heating machine has an air outlet opening 16 d. The air inlet port 14d is disposed parallel to the air outlet port 16d. The air inlet opening 14d and the air outlet opening 16d are arranged in a common plane 18d. The power heating machine has an air supply hollow body 54 d. The air supply hollow body 54 dis configured to provide the ambient air at the air inlet opening 14 d. The air supply hollow body 54 dmay be connected to an environment, for example, via a ventilation system. The power heating machine has an air discharge hollow body 56 d. The air discharge hollow body 56 dis configured to discharge the air flow to the environment, for example, via a ventilation system. The air supply hollow body 54 dis formed as a round tube. The air discharge hollow body 56 dis formed as a round tube. Alternatively, the air supply hollow body 54 dand / or the air discharge hollow body 56 dmay be formed as an angular tube or have a geometry that appears expedient to the person skilled in the art. The power heating machine has a connection element 58 d. The connector 58 dis configured to connect the round air supply hollow body 54 dto the semicircular air inlet opening 14 d. The power heating machine has a further connection element 60 d. The further connection element 60 dis configured to connect the hollow air discharge body 56 dto the air outlet opening 16 d. Alternatively, the air supply hollow body 54 dand / or the air discharge hollow body 56 dmay also be connected directly to the air inlet opening 14 dor the air outlet opening 16 d.

Claims

Power heating machine, in particular a building heat pump, having at least one heat exchanger (10a; 10b; 10c; 10d) and having at least one fan (12a; 12b; 12c; 12d) which is configured to provide an air stream for a heat transfer at the heat exchanger (10a; 10b; 10c; 10d), characterized in that the fan (12a; 12b; 12c; 12d) is designed as a radial fan.Power heating machine according to claim 1, characterised byat least one air inlet opening (14a) which is arranged at least substantially perpendicular to an air outlet opening (16a).Power heating machine according to claim 1, characterised byat least one air inlet opening (14b; 14c; 14d) which is arranged at least substantially parallel to an air outlet opening (16b; 16c; 16d).Power heating machine according to claim 3, characterised in that the air inlet opening (14b; 14c; 14d) and the air outlet opening (16b; 16c; 16d) are arranged in a common plane (18b; 18c; 18d).Power heating machine according to one of the preceding claims, characterized in that the heat exchanger (10a; 10b; 10c; 10d) is arranged between the air inlet opening (14a; 14b; 14c; 14d) and the fan (12a; 12b; 12c; 12d).Power heating machine according to one of the preceding claims, characterized in that the heat exchanger (10a; 10b; 10c; 10d) has an air main flow direction (20a; 20b; 20c; 20d) which has a smallest angle to a rotation axis (22a; 22b; 22c; 22d) of the fan (12a; 12b; 12c; 12d).Power heating machine according to one of the preceding claims, characterized byat least one air flow guide element (24a; 24b; 24c; 24d) which forms at least one intake duct (26a; 26b; 26c; 26d) between the air inlet opening (14a; 14b; 14c; 14d) and the heat exchanger (10a; 10b; 10c; 10d).Power heating machine according to claim 7, characterised in that the air flow guide element (24c; 24d) in the intake duct (26c; 26d) has a concave shape (28c; 28d).Power heating machine according to one of the preceding claims, characterized in that the shape (30b; 30c; 30d) of the air inlet opening (14b; 14c; 14d) is formed at least substantially by the shape (28b; 28c; 28d) of the air flow guide element (24b; 24c; 24d).Power heating machine according to one of the preceding claims, characterized in that the air inlet opening (14c; 14d) and / or the air outlet opening (16c; 16d) are at least substantially semicircular / semi-elliptical.Power heating machine according to one of the preceding claims, characterized byat least one insert module (32a; 32b; 32c; 32d) which has at least one first insert element (34a; 34b; 34c; 34d) which at least partially delimits the air inlet opening (14a; 14b; 14c; 14d) and which has at least one further insert element (36a; 36b; 36c; 36d) which at least partially delimits the air outlet opening (16a; 16b; 16c; 16d).

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