Compact hybrid system including a boiler and a heat pump

Abstract

The object of the present invention is a hybrid system (1) adapted to serve a heating system for at least the indoor heating and comprising a boiler (3) and a first circulator (32) and a heat pump (2) hydraulically connected to said boiler (3). Said heat pump (2) comprises at least a first heat exchanger (210), a compressor (211) and an expansion valve (212), a technical module (21) configured to house at least one or more of said components, and an external unit (20) comprising a second heat exchanger (200; 201) in a heat exchange relationship with the external air (AIR).

Description

[0001] COMPACT HYBRID SYSTEM INCLUDING A BOILER AND A HEAT

[0002] PUMP

[0003] DESCRIPTION

[0004] The object of the present invention is a hybrid system comprising a boiler and a heat pump of reduced overall dimensions and costs, and increased silence, efficiency, and installation flexibility.

[0005] The invention preferably falls within the sector of the “hybrid systems” adapted to serve a heating system for the indoor heating and / or cooling and / or for the production of sanitary hot water, particularly those systems comprising a fuel boiler and a heat pump, hydraulically and electronically coupled to each other.

[0006] Figure l.a and l.b show known hybrid systems 1’ that use a combination of at least two different heat generators, integrated and / or cooperating with each other, generally a heat pump 2’ and a fuel boiler 3’ (e.g., gas), preferably of the condensing type (referred to as “boiler” for the sake of brevity).

[0007] These systems, besides being used for the indoor heating and / or cooling, may also be arranged for the production of hot water for sanitary uses, in such case the boiler being of the “combined” type.

[0008] In such systems, hereinafter referred to as “hybrid systems” for simplicity, a hydraulic connection is to be created between the various heat generators 2’ and 3’, while appropriate shared control logics, which shall not be discussed any further being them well known to a man skilled in the art and in any case not relevant to the invention, allow the management and / or coordination of the While the boiler 3’ of a hybrid system 1’ is predominantly placed inside a building, e.g., hung on a wall of an installation room A, on the other hand, different installation ways may be envisaged for the heat pump 2’, both inside and outside the building.

[0009] For example, figure l.a shows a first possible installation of a known hybrid system 1’, which provides for a boiler 3’ installed as a wall unit on a wall of an internal room of a building and a heat pump 2’, the relative components whereof, well known to a man skilled in the art, are primarily placed in an external unit 20’ (also known as “ODU”) to said room A.

[0010] Such installation method, although very frequent, is not free from drawbacks and problems.

[0011] For example, the installation of the hybrid system 1’ may be expensive due to the complex connections needed to connect the external unit 20’ of heat pump 2’, which is outside a building, to the boiler 3.

[0012] Furthermore, the external unit 20’ of the heat pump 2’ requires adequate space for the installation, which is not always available in all buildings.

[0013] This may be a problem, especially in urban settings or in buildings with limited outdoor spaces, such as balconies or small courtyards. The lack of adequate space may therefore complicate the installation and require alternative solutions or structural modifications, thus increasing the project costs and completion times.

[0014] Even the solutions described in the prior art documents EP 4 739 266 Al and / or EP 2 322 880 Al are not free from such problems.

[0015] To eliminate, or at least significantly reduce, these problems, more compact and space-saving hybrid systems 1’ are being developed.

[0016] For example, increasing efforts are being made to integrate all the components of the heat pump 2’ inside the boiler 3’, with the aim of completely eliminating the overall dimensions represented by the external unit 20’.

[0017] Even this approach, schematically illustrated in figure l.b and / or in the documents EP 4 056 920 Bl and / or EP 3 361 179 Al, however, has limitations. For example, in the case of the air-to-water heat pumps 2’ integrated into the boiler 3’ of the hybrid system 1’, the boiler 3’ needs be connected to the outside of the installation room A via at least two ducts 4’, 5’; a first duct 4’ allows the air suction and supply towards the heat pump 2’, while a second duct 5’ allows the exhaust thereof outside the same installation room A.

[0018] For clarity, the ducts 4’ and 5’ shall be referred to as “air ducts 4’ and 5'” to distinguish them from the exhaust duct 6’ of the fuel gases and fumes of the boiler 3’.

[0019] The air ducts 4’ and 5’ are generally large, with diameters typically ranging between 150 and 200 mm, and may be insulated. This makes the installation of hybrid system 1’ particularly complex and expensive, as it requires masonry work and invasive interventions. In particular, large-diameter holes need to be drilled through one or more walls of the installation room A to allow the passage and the housing of the air ducts 4’ and 5’.

[0020] Furthermore, if the boiler 3’ of the hybrid system 1’ is not positioned at or in proximity of a perimeter wall of the building, it will be much more difficult to route the air ducts 4’ and 5’ towards the outside.

[0021] In this case, the considerable length of the air ducts 4’ and 5’ may become a critical aspect, making it necessary to cover them for aesthetic reasons. This would involve the use of expensive coverings, such as plasterboard or similar materials, which would require additional finishing work, such as plastering and painting.

[0022] Even the installation and start-up times of the hybrid system 1’ may be excessively long.

[0023] Finally, it should be noted that the hybrid system 1’ shown in figure l.b, especially if installed within a domestic environment, may be noisy, especially due to the air flow passing through the heat pump 2’, driven by the relative fan.

[0024] The object of the present invention is to obviate such drawbacks by providing a hybrid system consisting of a boiler and a heat pump, characterised by reduced overall dimensions and costs, while maintaining high efficiency. A further object of the present invention, at least for some executive variants thereof, is to provide for a hybrid system, composed of a boiler and a heat pump, that is easy, quick, flexible, and economical to install, minimising or completely eliminating the need for invasive building interventions.

[0025] A further object of the present invention, at least for some executive variants thereof, is to provide for a hybrid system, composed of a boiler and a heat pump, characterised by greater noiselessness.

[0026] These and other objects, which shall appear clear hereinafter, are achieved with a hybrid system comprising a boiler and a heat pump according to the provisions of the independent claims.

[0027] Other objects may also be achieved by means of the additional features of the dependent claims.

[0028] Further features of the present invention shall be better highlighted by the following description of a preferred embodiment, according to the patent claims and illustrated, purely by way of a non-limiting example, in the accompanying drawing tables, wherein:

[0029] - Figures l.a and l.b show a state-of-the-art hybrid system, comprising a boiler and a heat pump, according to a first and second installation method;

[0030] - Figure 2 schematically shows a hybrid system comprising a boiler and a heat pump according to a first executive embodiment of the invention;

[0031] - Figure 3 schematically shows a hybrid system comprising a boiler and a heat pump according to a second executive embodiment of the invention;

[0032] - Figure 4 schematically shows a hybrid system comprising a boiler and a heat pump according to a third executive embodiment of the invention;

[0033] - Figure 5 schematically shows a hybrid system comprising a boiler and a heat pump according to a fourth executive embodiment of the invention.

[0034] The features of one or more preferred variants of the hybrid system of the invention comprising a boiler and a heat pump, are now described using the references contained in the figures.

[0035] During the description, the parts and components of the hybrid system that have the same function or are equivalent to those of the state of the art will be indicated with the same numerals, but those relating to the state of the art have been marked with a superscript.

[0036] With reference to figures 2 to 5, numeral 1 therefore shows the hybrid system of the invention, adapted to serve a heating system for at least the indoor heating and / or cooling, comprising at least one boiler 3 and at least one heat pump 2, hydraulically and electronically coupled to each other.

[0037] It should be noted that in said figures, the components of the hybrid system 1, in particular of the heat pump 2 thereof, are only schematically illustrated, as their mutual connection is well known to the man skilled in the art.

[0038] In a first general configuration, the boiler 3 may be of the type comprising only the primary circuit 30 and the relative primary exchanger 34, where a first technical fluid (generally water) is substantially heated for the indoor heating.

[0039] For simplicity of description, hereinafter, reference shall be explicitly made to a hybrid system 1 operating in “indoor heating” mode (as illustrated, without limiting intent, in the attached figures). However, all the considerations made in relation to this operating mode may be extended, as shall be seen, also to the “indoor cooling”, given the possibility of reversing the thermodynamic cycle of the heat pump 2. In essence, depending on whether the hybrid system 1 operates in “cooling” or “heating” mode, the same heat exchanger of the heat pump 2 may carry out the function of either a condenser or an evaporator.

[0040] Furthermore, for the purposes of the invention and without any limiting intent, reference shall be preferably made to a fuel boiler (e.g., gas) of the condensing combined type, which includes, in addition to the primary circuit 30 for the indoor heating, a secondary circuit 31 for the production of sanitary hot water, equipped with a sanitary exchanger 35.

[0041] A circulator 32 enables the circulation of said first technical fluid along said primary 30 and secondary circuits 31, while a diverter valve 36, e.g., a 3-way valve, enables the boiler 3 to be switched between an indoor heating mode and a sanitary water production mode, or vice versa. Since such types of boilers 3 are well known to a man skilled in the art, it will not be necessary to discuss any further on the operation and / or additional components thereof, if any.

[0042] According to the invention, the heat pump 2 is instead preferably of the “split” type and therefore consists, as is known, essentially of two separate units, although hydraulically and functionally connected and cooperating with each other: a first unit 20, generally arranged outdoors and externally to the installation room A of the hybrid system 1 (also known as ODU), and a second unit 21, preferably consisting of a “technical module” 21, each unit 20 and 21 comprising one or more operating components of said heat pump 2.

[0043] More precisely, said technical module 21 may be configured to:

[0044] - house therein at least one operating component of the heat pump 2 of the hybrid system 1,

[0045] - be placed, optionally, inside the installation room A of the hybrid system 1 (e.g., in a technical room or in a living space), or outside it (e.g., outdoors, arranged on a balcony or in a generic area outside the same installation room A).

[0046] As it will clearly appear from the description of the figures 2-5, the technical module 21 is fluidically connected and cooperating with the external unit 20 of the heat pump 2 via pipes that, depending on the embodiment variant, may be traversed by a heat transfer fluid of the heat pump 2, hereinafter also referred to as "refrigerant” for the sake of brevity, or by a technical fluid of the hybrid system 1.

[0047] Reference shall also be made to a heat pump 2 that uses the external air AIR, even at low temperatures, in order to vary, in the ways that will be described, the temperature of the technical fluid in boiler 3, e.g., by heating and / or cooling it, so as to distribute it in the heating / cooling systems of a building (such as radiators or floor radiant panels) or to use it for the preparation of sanitary hot water.

[0048] Preferably, the technical module 21 may essentially consist of a box-shaped body specifically configured and sized to comprise and house, connected via dedicated pipes, at least one or more of said components:

[0049] - a compressor 211 that increases pressure and temperature of the refrigerant, and / or

[0050] - a first heat exchanger 210 configured to carry out a heat exchange between said heat transfer fluid of the heat pump 2 and said technical fluid of said boiler 3, and / or

[0051] - an expansion valve 212 that, as is known, reduces the pressure and the temperature of the refrigerant, preparing it for a new cycle.

[0052] When the hybrid system 1 is operating for the indoor and / or the sanitary hot water heating, the first heat exchanger 210 acts as a condenser 210, as it receives the heat that the heat transfer fluid of the heat pump 2 has drawn directly or indirectly from the external air AIR and transfers it to the technical fluid in the boiler 3, heating it.

[0053] According to a first possible variant of the invention, the technical module 21 may comprise and house therein at least the compressor 211 and the expansion valve 212 of the heat pump 2, while the condenser 210 may be directly integrated into the boiler 3, suitably inserted and positioned inside the casing or chassis 37 thereof. See, for example, the configuration of the figures 2 and 3, in which the technical module 21 is placed inside the installation room A, or the variant of figure 4, in which the same technical module 21 is arranged outside.

[0054] In this embodiment, the condenser 210 may be preferably positioned downstream of the circulator 32 of the boiler 3, for example between the same circulator 32 and the primary exchanger 34.

[0055] Nothing prevents the technical module 21, when placed inside the installation room A and the same boiler 3, from being integrated into a single shared container body, symbolically indicated by the dotted line C in figures 2 and / or 3. In a further possible embodiment variant, the condenser 210 may also be advantageously housed inside the technical module 21, both when said technical module 21 is placed inside the installation room and when it is arranged outside.

[0056] Such an option, illustrated by way of an example in the configuration of figure 5, may be extended, with minimal adaptations within the reach of a man skilled in the art, also to the configurations of the figures 2, 3, and / or 4.

[0057] Furthermore, nothing prevents the entire technical module 21 from being integrated into the boiler 3, thus creating a compact system that essentially constitutes a single body.

[0058] In this case, the technical module 21, or the components thereof, will be adequately arranged inside the casing 37 of the boiler 3, without significantly increasing size or overall dimensions thereof, with the condenser 210 that may be preferably positioned between the circulator 32 and the primary exchanger 34 of the boiler 3.

[0059] According to the invention, the external unit 20 of the heat pump 2 comprises instead at least a second heat exchanger 200, 201 in a heat exchange relationship with the external air AIR. As shall be seen, said second heat exchanger 200, 201 is therefore configured to carry out a heat exchange between said external air AIR and said refrigerant of the heat pump 2 or a second technical fluid of the hybrid system 1.

[0060] In heating mode, said second heat exchanger 200, 201 is capable of absorbing heat from said external air AIR.

[0061] Preferably, said external unit 20 may also comprise a fan 202, for example of a tangential type, which sucks the external air AIR, allowing it to pass through the second heat exchanger 200, 201; in such regard, see the arrows of figure 3 and / or 4 referred, by way of an example, to the air flow AIR which, with the hybrid system 1 in heating mode, is capable of passing through the second heat exchanger 200, 201, preferably from top to bottom.

[0062] In case the heat pump 2 of the hybrid system 1 is of the air-to-water type, as shown in the variant of figure 2, said second heat exchanger 200, 201 consists of the evaporator 200 of the same heat pump 2, wherein the refrigerant fluid circulates.

[0063] Alternatively, if the heat pump 2 of the hybrid system 1 is of the water-to-water type, as shown in figure 3, the second heat exchanger 200, 201 is a compact exchanger 201, for example a finned coil 201 (hereinafter also referred to as “external exchanger 201”), capable of heating a second technical fluid passing therethrough, preferably technical water. This second technical fluid exchanges heat, by heating it, with the refrigerant of the heat pump 2 in a third heat exchanger 214, in such variant operating as an evaporator 214, which may be part of the technical module 21 and / or integrated into the boiler 3.

[0064] Compared to the state-of-the-art shown in figure l.a, the external unit 20, which contains the heat exchanger 200 or 201 and possibly the fan 202, therefore distinguishes by its particular compactness, with small dimensions and minimal visual impact.

[0065] Furthermore, since the external unit 20 of the executive variants of figure 2, 3, 4, or 5 is generally installed outside of a building and therefore directly exposed to the external air AIR, it is not necessary to install any ducts for conveying the air towards the evaporator 200 of the heat pump 2 and subsequently discharging it. This represents an important difference compared to the state-of-the-art compact hybrid systems that provide for the evaporator integrated inside the boiler, as illustrated in figure l.b, where such air supply and exhaust ducts are essential. This also significantly facilitates the installation of the same hybrid system 1.

[0066] For example, masonry work and particularly invasive and expensive interventions are no longer required for drilling large holes on one or more walls of the installation room A of the hybrid system 1, or of the building in general, to allow the passage of the air ducts, which are no longer provided for.

[0067] On the contrary, according to the invention, it is sufficient to drill small holes, intended exclusively for the passage of pipes, also of small diameter, configured to transport the refrigerant of the heat pump 2 or a technical fluid (usually water) of the boiler 3 or of the possible heat exchanger 214.

[0068] Said small-diameter pipes may take different configurations depending on whether the technical module 21 is placed inside or outside the installation room A and depending on the type of heat pump (air-to-water or water-to-water), as illustrated in figures 2-5. For example, when the technical module 21 is placed inside the installation room A of the hybrid system 1, the small-diameter pipes may comprise:

[0069] - pipes 70 and 71, crossed by the refrigerant, configured to connect the evaporator 200 of the external unit 20 respectively to the compressor 211 and to the expansion valve 212 of the air-to-water heat pump 2 of figure 2; or

[0070] - pipes 80 and 81, crossed by a technical fluid (typically water), configured for constituting the thermodynamic circuit connecting the heat exchanger 201 of the external unit 20 to the evaporator 214, in which the heat exchange occurs between the technical fluid heated by the external heat exchanger 201 and the refrigerant of the heat pump 2, as illustrated in the example of the water-to- water heat pump of figure 3.

[0071] In this last variant, a second circulator 82, positioned for example on the delivery 80 or return pipe 81, allows the technical fluid to circulate between the external exchanger 201 and the evaporator 214 of the heat pump 2.

[0072] The circulator 82 may be integrated into the technical module 21 of the heat pump 2 or into the boiler 3, without any limitation.

[0073] Conversely, when the technical module 21 is arranged outside the installation room A of the hybrid system 1, the small-diameter pipes may comprise:

[0074] - pipes 72 and 73, crossed by the refrigerant, configured to connect the condenser 210 respectively to the compressor 211 and to the expansion valve 212 of the heat pump 2, if the condenser 210 is integrated into the boiler 3, as illustrated in the example of the air-to-water heat pump of figure 4; or

[0075] - pipes 83 and 84, crossed by the technical fluid of the boiler 3 (typically water), configured to connect the delivery and return pipes of the primary circuit 30 of the boiler 3 to said technical module 21, more precisely to the condenser 210 of the heat pump 2 in case it is placed inside the same technical module 21, as illustrated in the example of the air-to-water heat pump of figure 5.

[0076] For clarity, it should be noted that:

[0077] - when the technical module 21 is placed inside the installation room A, the pipes connecting with the external unit 20 coincide with the pipes 70 and 71 (for the refrigerant) or 80 and 81 (for the technical fluid), which pass through the walls of same room A, as illustrated for the variants illustrated in figures 2 and 3;

[0078] - however, when, the technical module 21 is placed outside the installation room A, the connections between the inner components thereof and the external unit 20 take place by means of known pipes P already arranged outside.

[0079] According to the invention, the heat exchanger 200, 201 of the external unit 20 of the heat pump 2 may cooperate with a photovoltaic-thermal panel (PVT), so as to exploit the solar energy to simultaneously produce electricity and heat, optimising the energy efficiency of the hybrid system 1.

[0080] In detail, the heat exchanger 200, 201 of the external unit 20 may be closely integrated and / or coupled with a photovoltaic-thermal panel 9, which comprises at least:

[0081] - a photovoltaic panel PV, which converts the incident sunlight into electricity, and

[0082] - a thermal absorber T which, placed in contact under the photovoltaic panel PV, captures the heat generated therefrom to heat the refrigerant (variant of figure 2) or the technical fluid (variant of figure 3) circulating respectively through the exchanger 200 or 201 of the external unit 20.

[0083] In other words, according to such a variant of the invention, the external unit 20 is configured to:

[0084] - capture the solar radiation and convert it into electricity that may be used for the most varied purposes, for example to supply any user or the same electrical devices of the hybrid system 1, such as, without any limiting intent, at least the circulators 32 and / or 82 thereof;

[0085] - absorb the heat generated by the sunlight striking the photovoltaic panel PV, transferring it to the refrigerant fluid or to a technical fluid;

[0086] - evaporate the refrigerant fluid in the evaporator 200 or 214 of the heat pump 2, increasing the efficiency of the thermodynamic cycle.

[0087] It is clear that with the present invention the stated objects are achieved; in particular, a hybrid system with reduced overall dimensions and costs, easy and quick installation, and high efficiency is provided.

[0088] The external unit (ODU) 20, comprising the exchanger 200, 201, may take a substantially flat geometry, made possible by the fact that the compressor and / or other bulky components normally present have been moved and housed in a special technical module 21.

[0089] Thanks to such a configuration, the heat exchanger 200, 201 may be installed with minimal aesthetic and overall dimension impact. In fact, it may be integrated (built-in) into a wall or roof, designed as a painted panel in the same colour as the building, or masked by existing architectural elements (tiles, roof tiles, coverings), provided that an adequate air circulation is guaranteed, for example by means of dedicated openings for the suction and exhaust.

[0090] The installation may also take place in non -conventional positions, such as horizontally under a balcony, on the front face of a railing, or integrated into the load-bearing structure thereof, effectively resulting in harmony with the building and essentially almost invisible.

[0091] The elimination of design constraints typical of the traditional ODUs — such as the presence of the compressor or other bulky components — allows the structure and arrangement thereof to be rethought, achieving an external unit so flat that it may be recessed into the wall or roof, or installed with such a small overall dimension that it does not compromise the habitability of outdoor spaces, such as balconies, which may continue to be furnished and used.

[0092] The present invention therefore allows one of the main obstacles to the adoption of heat pumps in historic city centres, where stringent architectural and aesthetic constraints apply to, be overcome.

[0093] The substantially “flat” configuration of the heat exchanger 200, 201, characterised by a reduced thickness but by a large surface extension (e.g., with a form factor substantially equal to or less than 0.2, or equal to or less than 0.1, or equal to or less than 0.05), allows for increasing the exchange surface while maintaining a minimum overall dimension in depth at the same time.

[0094] This enables the use of smaller, more economical and silent fans 202, with an airflow distributed over a larger area and therefore less noisy.

[0095] Furthermore, in the hybrid system 1 of the invention, the main sound sources — the fan and the airflow generated therefrom — are located in the external unit 20, outside the living space, further reducing the overall acoustic impact of the heat pump 2.

[0096] Even the maintenance of the heat pump 2 of the hybrid system 1 is simplified, particularly when most of the components thereof is integrated into the relative boiler 3, which is typically installed inside the building in easily accessible positions, or in the technical module 21.

[0097] Finally, it is clear that several variants of the hybrid system 1 of the invention are possible for the man skilled in the art, without departing from the novelty scopes of the inventive idea, as well as it is clear that in the practical embodiment of the invention the various components of said hybrid system may be replaced by technically equivalent elements.

[0098] For example, as previously mentioned, the hybrid system 1 of the invention, in addition to operating according an indoor heating and / or sanitary water mode, may provide, in addition or alternatively, also for the indoor cooling.

[0099] In such case, the heat pump 2 of said hybrid system 1 comprises a switching valve (not shown in the attached figures), which, as is known, allows its operation to be converted from the heating to the cooling mode (and vice versa); for example, such switching valve may be placed indifferently either in the technical module 21 or in the external unit 20 of the heat pump 2, or integrated into the boiler 3, and may consist, without any limiting intent, of a four-way valve. Consequently, when the hybrid system 1 operates in cooling mode, the heat exchangers, that functioned as condensers in heating mode functioned as condensers, become evaporators, while those that were evaporators become condensers. Therefore, for clarity, in the hybrid system 1 of the variant of figure 2:

[0100] - in “heating mode”, the first heat exchanger 210 of the heat pump 2 acts, as shown, as a condenser 210, while the second exchanger 200 of the external unit 20 acts as an evaporator 200;

[0101] - in “cooling mode”, the first heat exchanger 210 of the heat pump 2 acts as an evaporator, while the second heat exchanger 200 of the external unit 20 acts as a condenser 200, with the air flow AIR passing therethrough preferably from top to bottom, in the opposite direction to that shown in figure 2.

[0102] Similarly, for the hybrid system 1 illustrated in figure 3 :

[0103] - in “heating mode”, the first heat exchanger 210 and the third 214 of the heat pump 2 respectively act as a condenser and evaporator, while the second exchanger 201 of external unit 20 acts, as seen, as a heat absorber;

[0104] - in ’’cooling mode”, the first heat exchanger 210 and the third 214 of the heat pump reverse the operation thereof, acting respectively as an evaporator and condenser, while the second exchanger 201 of the external unit 20 primarily act as a heat sink for the relative technical fluid, with the air flow AIR passing therethrough preferably in the opposite direction to that shown in figure 3.

[0105] It should also be noted that in cooling mode, the boiler 3 is passively crossed by the technical fluid to be sent to the radiators or floor radiant panels (or similar devices), i.e., without any heating of the same.

[0106] Finally, in a further variant of the invention, it is possible to house in the external unit 20 of the heat pump 2, in addition to the second heat exchanger 200, 201 and the relative fan 202, also other components up to now provided integrated into the technical module 21 and / or into the boiler 3, provided that a significant increase in the dimensions does not occur, thus maintaining the desired compactness. Without any limiting intent, one or more of the known components of the heat pump 2 may therefore be placed in said external unit 20, for example, the aforementioned expansion valve 212 and / or possible sensors, thermostats, small accumulators (“liquid receivers”) and / or switching valves, or similar devices.

Claims

CLAIMS1. Hybrid system (1) adapted to serve a heating system for at least the indoor heating, comprising at least:- a boiler (3) comprising at least one primary circuit (30) whereon a first technical fluid circulates, and a first circulator (32),- a heat pump (2) hydraulically connected to said boiler (3) and configured to use external air (AIR) in order to change the temperature of said first technical fluid of the boiler (3), said heat pump (2) comprising at least:- a compressor (211),- a first heat exchanger (210) configured to carry out a heat exchange between a heat transfer fluid of said heat pump (2) and said technical fluid of said boiler (3),- an expansion valve (212),- a second heat exchanger (200; 201) configured to carry out a heat exchange between said external air (AIR) and said heat transfer fluid of said heat pump (2) or a second technical fluid of said hybrid system (1), characterised in that said heat pump (2) comprises at least one technical module (21) configured to house therein at least said compressor (211) and / or said expansion valve (212), and in that it further comprises an external unit (20) comprising at least said second heat exchanger (200; 201) and connected and cooperating with said technical module (21).

2. Hybrid system (1) according to claim 1, characterised in that said first heat exchanger (210) of said heat pump (2) is housed in said boiler (3) inside the casing (37) thereof.

3. Hybrid system (1) according to claim 2, characterised in that said first heat exchanger (210) is positioned between said circulator (32) and a primary exchanger (34) of said boiler (3).

4. Hybrid system (1) according to claim 1, characterised in that said first heatexchanger (210) of said heat pump (2) is housed in said technical module (21).

5. Hybrid system (1) according to one or more of the previous claims 1 to 4, characterised in that said technical module (21) is configured to be placed inside said installation room (A).

6. Hybrid system according to at least claim 5, characterised in that said second heat exchanger (200; 201) of said external unit (20) is connected via a first (70) and second pipe (71), respectively to said compressor (211) and expansion valve (212), said first (70) and second pipe (71) being crossed by said heat transfer fluid of said heat pump (2).

7. Hybrid system (1) according to at least claim 5, characterised in that said second heat exchanger (200; 201) of said external unit (20) is a heat exchanger (201) capable of heating or cooling a second technical fluid, preferably technical water, which passes therethrough, said second heat exchanger (201) being connected via a delivery pipe (80) and a return pipe (81) to a third heat exchanger (214) of said heat pump (2) wherein said second technical fluid, circulated by a second circulator (82), exchanges heat with said heat transfer fluid of said heat pump (2).

8. Hybrid system (1) according to claim 7, characterised in that said second circulator (82) is positioned on said delivery (80) or return pipe (81) and said third heat exchanger (214) is part of said technical module (21) and / or integrated into said boiler (3).

9. Hybrid system (1) according to one or more of the previous claims 1 to 4, characterised in that said technical module (21) is configured to be placed outside said installation room (A), said technical module (21) being connected to said external unit (20) by means of pipes (P) crossed by said heat transfer fluid of said heat pump (2).

10. Hybrid system (1) according to at least claims 2 and 9, characterised in that it comprises pipes (72) and (73), crossed by said heat transfer fluid, configured to connect said first heat exchanger (210) respectively to saidcompressor (211) and expansion valve (212), said first heat exchanger (210) being integrated into said boiler (3).

11. Hybrid system (1) according to at least claims 4 and 9, characterised in that it comprises pipes (83) and (84), crossed by the technical fluid of said boiler (3), configured to connect the delivery and return ducts of the primary circuit (30) of said boiler (3) to said first heat exchanger (210), said first heat exchanger (210) being housed in said technical module (21).

12. Hybrid system (1) according to one or more of the previous claims, characterised in that said heat pump (2) further comprises a switching valve capable of switching the operation of said hybrid system (1) from said heating mode to an indoor cooling mode, said first heat exchanger (210) inverting its operation from condenser (210) to evaporator (210).

13. Hybrid system (1) according to claim 12, characterised in that said switching valve may be housed in said technical module (21).

14. Hybrid system (1) according to one or more of the previous claims, characterised in that said external unit (20) further comprises a fan (202) that sucks said external air (AIR) enabling it to pass through said second heat exchanger (200; 201) thereof.

15. Hybrid system (1) according to any previous claim, characterised in that said second heat exchanger (200; 201) of said external unit (20) is integrated and cooperates with a photovoltaic-thermal panel (9).

16. Hybrid system (1) according to any previous claim, characterised in that said boiler (3) further comprises a secondary circuit (31), and relative sanitary exchanger (35), for the production of sanitary water, said boiler (3) providing for a diverter valve (36) to switch the operation thereof between the indoor heating and sanitary water production modes.

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