FR3113719A1 - Instantaneous electric water heater comprising a front face capable of capturing and emitting waste heat lost by the heating tank and installation - Google Patents

Abstract

The invention relates to an instantaneous electric water heater (A) intended to be electrically connected to an electrical energy supply source (S). The instantaneous electric water heater (A) comprises a heating tank (100), at least one resistive tank body (130, 140) capable of generating heat, an electrical power supply system (350) and a radiant wall (600). One of said electrical power system electronic components (350) includes an electrical energy storage system (400). The radiating wall (600) is in a situation of heat exchange, in particular by conduction, with an external surface of the heating tank (100), and captures all or part of the calories lost by the heating tank (100). The radiating wall (600) emits in particular by radiation, towards the exterior of the instantaneous electric water heater (A), all or part of said calories. Figure 1

Description

Instantaneous electric water heater comprising a front face capable of capturing and emitting waste heat lost by the heating tank and installation

Technical field of the invention

The present invention relates to an instantaneous electric water heater intended to be electrically connected to an electrical energy supply source, said instantaneous electric water heater comprising:

a heating tank defining an internal volume capable of containing water and comprising at least one water inlet allowing water to enter the internal volume and at least one water outlet allowing water contained in the internal volume to come out of the heating tank,

at least one resistive tank body capable of generating heat when it is powered by an electric current so as to heat all or part of the water contained in the internal volume,

a power supply system capable of being supplied with electricity by the power supply source and of delivering the electric current supplying said at least one resistive body of the vessel, the power supply system comprising a plurality of interposed electronic components between the electrical energy supply source and the said at least one resistive body of the vessel, one of the said electronic components of the electrical supply system comprising an electrical energy storage system, in particular an electric battery based on electrochemical cells and/or a power capacitor.

The invention also relates to an installation comprising such an instantaneous electric water heater.

State of the art

A water heater of the aforementioned type is known from the state of the art. For example, document US2016169557A describes such an instantaneous electric water heater in which one or more temperature-changing devices are placed in a water channel located between a boiler and the water supply tap. Each temperature-modifying device is powered by an energy storage capacitor, each driven by a switch. Such a water heater makes it possible to heat the water relatively quickly near the outlet of the tap, without having to wait for the hot water generated by the boiler to reach the tap.

A so-called "instantaneous" electric water heater is an electric water heater that has the ability to produce water instantly, in situ, in the immediate vicinity of the means of delivering hot water to the user.

Generally, and as presented in the document US2016169557A, instantaneous electric water heaters involve a heating tank intended to contain the water to be heated. According to the embodiments, the hot water can be stored in the heating tank before being evacuated from the heating tank. Alternatively, the heated water can be delivered immediately after it is heated. Despite the advantage that this solution may have in terms of electrical energy management due to the fact of being able to have a quantity of hot water available almost instantaneously, it does not yet give complete satisfaction because under these conditions , but also when the water is heated by the water heater, there are heat losses towards the outside of the heating tank, the calories thus lost forming a fatal heat completely absorbed in the thermally insulating materials which are initially arranged around of the heating tank to prevent heat dissipation to the outside of the heating tank.

Finally, the current trend is for the electrical installations of homes to rely on a variety of electrical power sources, typically combining direct voltage sources and alternating voltage sources, in particular to include local electricity production. However, in this organization, the known water heaters can then only be used in association with only some of the available current sources, which is extremely constraining and limiting.

Object of the invention

The object of the present invention is to propose an instantaneous electric water heater and an installation which responds to all or part of the aforementioned problems.

In particular, the aim of the invention is to propose a solution which meets at least one of the following objectives:

• instantly heat a quantity of water using the lowest possible electrical power;
• have the highest possible overall yield;
• be simple in design and manufacture;
• be economical and reliable;
• be able to adapt to an existing electrical installation;
• limit unnecessary heat losses;
• adapt to AC and/or DC power sources.

This object can be achieved thanks to the implementation of an instantaneous electric water heater intended to be electrically connected to a source of electrical energy supply, said instantaneous electric water heater comprising:

• a heating tank defining an internal volume capable of containing water and comprising at least one water inlet allowing water to enter the internal volume and at least one water outlet allowing water contained in the internal volume to come out of the heating tank,
• at least one resistive tank body capable of generating heat when it is powered by an electric current so as to heat all or part of the water contained in the internal volume,
• a power supply system capable of being supplied with electricity by the power supply source and of delivering the electric current supplying said at least one resistive body of the vessel, the power supply system comprising a plurality of interposed electronic components between the electrical energy supply source and the said at least one resistive body of the vessel, one of the said electronic components of the electrical supply system comprising an electrical energy storage system, in particular an electric battery based on electrochemical cells and/or a power capacitor,
• a radiating wall in a situation of heat exchange, in particular by conduction, with an external surface of the heating tank, the radiating wall capturing all or part of the calories lost by the heating tank at the level of said external surface and emitting, in particular by radiation, towards the exterior of the instantaneous electric water heater, all or part of the calories captured from said external surface.

Some preferred but non-limiting aspects are as follows.

According to one embodiment, the radiating wall can be integrated into the heating tank, and configured to delimit all or part of the internal volume delimited by the heating tank.

According to one embodiment, the radiating wall can be directly in contact with the water contained in the internal volume delimited by the heating tank.

According to one embodiment, the instantaneous electric water heater may comprise a single resistive tank body able to generate heat when it is powered by an electric current so as to heat all or part of the water contained in the volume internal. In this case, this single resistive vessel body can be supplied with electrical energy via the electrical power supply system.

According to one embodiment, the at least one resistive tank body is configured to heat the heating tank, and the heating tank is configured to heat the water contained in the internal volume delimited by the heating tank.

According to one embodiment, the at least one resistive tank body is in direct contact with the water contained in the internal volume delimited by the heating tank, and configured to directly heat the water with which it is in contact.

According to one embodiment, the radiating wall comprises at least one resistive wall body, distinct from the at least one resistive tank body and capable of generating heat when it is powered by an electric current delivered by the system of power supply, so as to heat all or part of the radiating wall, the radiating wall capturing all or part of the calories coming from the at least one resistive body of the wall and emitting, in particular by radiation, towards the outside of the heater instantaneous electric water all or part of the calories captured from the at least one wall resistive body.

According to one embodiment, the instantaneous electric water heater may comprise a single wall resistive body capable of generating heat when it is powered by an electric current so as to heat all or part of the radiating wall. In this case, this single wall resistive body can be supplied with electrical energy via the electrical power supply system.

According to one embodiment, the radiating wall comprises at least a first resistive body of the wall, able to generate heat when it is powered by an alternating electric current delivered by the electric power supply system, and at least a second body wall resistor, distinct from the first wall resistive body, and capable of generating heat when it is supplied by a direct electric current delivered by the electric power supply system.

According to one embodiment, the electrical energy storage system is capable of directly supplying the second wall resistive body with direct electrical current.

According to one embodiment, the heating tank comprises at least a first resistive body of the tank capable of generating heat when it is powered by an alternating electric current delivered by the electric power supply system so as to heat all or part of the volume of water contained in the heating tank, and at least one second resistive tank body separate from the first resistive tank body and able to generate heat when it is powered by a direct electric current delivered by the heating system power supply so as to heat all or part of the volume of water contained in the heating tank.

According to one embodiment, the first resistive tank body and the second resistive tank body are contained in a single heating body in one piece.

According to one embodiment, the electrical energy storage system is capable of directly supplying the second resistive body of the tank with direct electrical current.

According to one embodiment, the electrical power supply system comprises a voltage step-down step-up comprising a first input configured to connect the voltage step-down step-up to the electrical energy storage system and at least one of the following outputs:

- A first output connected to the second resistive tank body and capable of supplying the second resistive tank body with direct electric current;

- A second output connected to the second resistive wall body and capable of supplying the second resistive wall body with direct electric current.

According to one embodiment, the first resistive tank body is powered at a first voltage level and the second resistive tank body is powered at a second voltage level strictly lower than said first voltage level.

According to this embodiment, the first voltage level may correspond to the voltage level of the local electrical network, in particular substantially equal to 220V, and the second voltage level may be within a range ranging from 20V to 60V, in particular substantially equal to 50V.

The arrangements according to the invention make it possible in particular to interface with an existing electrical installation without substantial modification of the existing electrical installation. In other words, the instantaneous electric water heater comprising the storage system as described can be added to an existing electrical installation or be dimensioned as small as possible. To do this, the electrical energy storage system can be chosen to adapt to the parameters of the existing installation.

According to one embodiment, the electrical power supply source comprises an AC electrical network, and the electrical power system comprises a voltage boost inverter comprising an input configured to connect the voltage boost inverter to the storage system of electrical energy and at least one of the following outputs:

• a first output connected to the first resistive tank body and capable of supplying the first resistive tank body with alternating electric current;
• a second output connected to the first resistive wall body and capable of supplying the first resistive wall body with alternating electric current;
• a third output adapted to be connected to the AC electrical network.

According to one embodiment, the electric power supply source comprises an alternating electric network, and one of the electronic components of the electric power supply system comprises a voltage step-down rectifier interposed between the alternating electric network and at least the one of the elements belonging to the group consisting of the second resistive body of the tank and the second resistive body of the wall.

According to the embodiment described above, the second resistive tank body and the second resistive wall body can each be supplied either by the electrical energy storage system on the one hand, or by the alternating electrical network via the intermediary of the rectifier-step-down voltage on the other hand.

The arrangements previously described allow the AC electrical network to supply electrical energy to the second resistive body of the tank and/or the second resistive body of the wall, via the step-down rectifier.

According to one embodiment, the operation of the first resistive tank body and the second resistive tank body simultaneously makes it possible to achieve heating powers greater than those guaranteed by heating via a single resistive tank element.

In the same way, when the water is heated by using on the one hand the first resistive body of the tank powered by the AC electrical network (or by the electrical energy storage system) and on the other hand the second resistive body tank powered by the electrical energy storage system (or by the AC electrical network), it is possible to reach a given temperature with a low maximum power drawn from the electrical energy supply source.

According to one embodiment, the operation of the first resistive wall body and of the second resistive wall body simultaneously makes it possible to achieve heating powers greater than those guaranteed by heating via a single resistive wall element.

Advantageously, the arrangements according to the invention make it possible to recharge the electrical energy storage system by the AC electrical network via the rectifier-step-down converter or by a renewable electricity source when electricity is available. . In particular, the arrangements according to the invention can allow the recharging of the system when the electrical energy available is the least expensive.

According to one embodiment, the instantaneous electric water heater comprises a water conveying system comprising:

• a water inlet channel capable of containing water and connected to the heating tank by the water inlet;
• a first water outlet path connected to the heating tank by a first water outlet and capable of being connected to at least one of the elements belonging to the group comprising an external water network and a water tank;
• a second water outlet route connected to the heating tank by a second water outlet capable of being connected to an external water drainage network.

According to one embodiment, all or part of the water heated in the heating tank is stored in the water tank and reinjected into the tank through the water inlet.

According to one embodiment, the instantaneous electric water heater comprises heat exchange elements making it possible to ensure a heat exchange between on the one hand at least one of the electronic components of the electrical power supply system and on the other hand water contained in the internal volume delimited by the heating tank and/or contained in said at least one water inlet channel of the water conveying system.

According to one embodiment, the water conveying system can comprise a water recirculation channel configured to put the water inlet channel and the first water outlet channel in fluidic connection. The water recirculation channel may in particular comprise a recirculation valve configured to allow or not the passage of water between the first water outlet channel and the water inlet channel.

This object can also be achieved through the implementation of an installation comprising an instantaneous electric water heater of the type described above, and an electrical energy supply source supplying electricity to the instantaneous electric water heater.

Some preferred but non-limiting aspects are as follows.

According to one embodiment, the electrical energy supply source comprises an alternating electrical network.

According to one embodiment, the electrical energy supply source comprises a continuous electrical energy source comprising at least one element belonging to the group comprising: a fuel cell, a battery based on electrochemical cells, at least one photovoltaic panel , a large capacity capacitor.

Brief description of the drawings

Other aspects, objects, advantages and characteristics of the invention will appear better on reading the following detailed description of preferred embodiments thereof, given by way of non-limiting example, and made with reference to the appended drawings. on which ones :

There is a schematic view of an example of implementation of an instantaneous water heater according to the invention.

There is a schematic view of another example of implementation of an instantaneous water heater according to the invention.

There is a schematic view of another example of implementation of an instantaneous water heater according to the invention.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the comprising a wall resistive body.

There is a schematic view of another embodiment variant of the instantaneous water heater of the comprising resistive wall bodies.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the including a step-down step-up.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the including a voltage step-up inverter.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the including a rectifier-step-down voltage.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the including a water conveying system.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the comprising heat exchange elements.

There is a schematic view of an alternative embodiment of the instantaneous water heater of the including a water recirculation path.

detailed description

In FIGS. 1 to 11 and in the remainder of the description, the same references represent identical or similar elements. In addition, the various elements are not represented to scale so as to favor the clarity of the figures. Furthermore, the different embodiments and variants are not mutually exclusive and can be combined with each other.

With reference to Figures 1 to 11, the invention first relates to an instantaneous electric water heater denoted "A" intended to be electrically connected to an electrical power supply source denoted "S".

The invention also relates to an installation comprising such an instantaneous electric water heater A and an electric energy supply source S supplying electric energy to the instantaneous electric water heater A.

According to one embodiment, the electrical energy supply source S comprises an alternating electrical network B.

Alternatively or jointly, the electrical energy supply source S may comprise a continuous electrical energy source comprising at least one element belonging to the group comprising: a fuel cell, a battery based on electrochemical cells, at least one photovoltaic panel , a large capacity capacitor.

The instantaneous electric water heater A comprises a heating tank 100 delimiting an internal volume capable of containing water and comprising at least one water inlet 110 allowing water to enter the internal volume and at least a water outlet 120a, 120b allowing the water contained in the internal volume to come out of the heating tank 100.

The instantaneous electric water heater A also comprises at least one resistive tank body 130, 140 capable of generating heat when it is powered by an electric current so as to heat all or part of the water contained in the internal volume .

As illustrated on the , the instantaneous electric water heater A may comprise a single resistive tank body 130, 140 able to generate heat when it is powered by an electric current so as to heat all or part of the water contained in the internal volume .

According to an embodiment shown in the , the at least one resistive tank body 130, 140 is configured to heat the heating tank 100, and the heating tank 100 is configured to heat the water contained in the internal volume delimited by the heating tank 100.

According to another embodiment, shown in Figures 1 and 3 to 11, the at least one resistive tank body 130, 140 is in direct contact with the water contained in the internal volume delimited by the heating tank 100, and configured to directly heat the water with which it is in contact.

The instantaneous electric water heater A further comprises an electrical power supply system 350 adapted to be supplied with electricity by the electrical energy supply source S and to deliver the electric current supplying the at least one resistive body of the tank 130 , 140.

The electrical power supply system 350 comprises a plurality of electronic components interposed between the electrical power supply source S and the at least one resistive vessel body 130, 140.

One of the electronic components of the electrical power supply system 350 comprises an electrical energy storage system 400, in particular an electric battery based on electrochemical cells and/or a power capacitor.

In the variant illustrated in the for which the instantaneous electric water heater A comprises a single resistive tank body 130, 140, said resistive tank body 130, 140 can be supplied with electrical energy via the electrical power supply system 350 comprising the storage system of electrical energy 400, and possibly other electronic components which will be described in the following embodiments.

In the following description, the figures show embodiments for which the heating tank 100 comprises a first resistive tank body 130, and a second resistive tank body 140. It is however well understood that these embodiments can include a single resistive tank body 130, 140.

In the variants represented in FIGS. 2 to 11, the heating tank 100 comprises at least a first resistive body of the tank 130 able to generate heat when it is powered by an alternating electric current, and at least a second resistive body 140 separate from the first resistive body of the tank 130 and able to generate heat when it is powered by a direct electric current 351.

The electrical energy may be delivered to the first resistive tank body 130 and to the second resistive tank body 140 by the electrical power supply system 350 so as to heat all or part of the volume of water contained in the heating tank 100 .

In particular, the first resistive tank body 130 can be powered at a first voltage level and the second resistive tank body 140 can be powered at a second voltage level strictly lower than said first voltage level.

For example, the first voltage level may correspond to the voltage level of the local electrical network, in particular substantially equal to 220V, and the second voltage level may be within a range ranging from 20V to 60V, in particular substantially equal to 50V.

According to an embodiment not shown, the first resistive tank body 130 and the second resistive tank body 140 are contained in a single heating body in one piece.

According to an embodiment illustrated in particular by FIGS. 2 to 5 and 9 to 11, the electrical energy storage system 400 is capable of directly supplying the second resistive body of the tank 140 with direct electric current.

The provisions described above make it possible in particular to interface with an existing electrical installation without substantial modification of the existing electrical installation. In other words, the instantaneous electric water heater A comprising the storage system 400 as described can be added to an existing electrical installation or be dimensioned as small as possible. To do this, the 400 electrical energy storage system can be chosen to adapt to the parameters of the existing installation.

In particular, the provisions previously described can make it possible to reuse the original wiring of an existing water heater, for example of 3 kW, while making it possible to offer a heating power of up to 10 kW without, however, in addition, having to modify the parameters of the electrical energy supply source S.

Advantageously, the operation of the first resistive tank body 130 and the second resistive tank body 140 simultaneously can make it possible to achieve heating powers greater than those guaranteed by heating via a single resistive tank element.

In the same way, when the water is heated by using on the one hand the first resistive body of the tank 130 powered by the AC electrical network B or by the electrical energy storage system 400, and on the other hand the second resistive vessel body 140 powered by the electrical energy storage system 400 or by the AC electrical network B, it is possible to reach a given temperature with a low maximum power drawn from the electrical energy supply source S.

The instantaneous electric water heater A also comprises a radiant wall 600 in a heat exchange situation, in particular by conduction, with an outer surface of the heating tank 100.

The radiating wall 600 is configured to capture all or part of the calories lost by the heating tank 100 at the level of the external surface and emits, in particular by radiation, towards the exterior of the instantaneous electric water heater A all or part of the calories captured from the outer surface.

In general, the radiating wall 600 can include form factors where its length and/or its width are very large compared to its thickness.

According to one embodiment, the radiating wall 600 can comprise a material configured to guarantee electrical insulation and good emissivity properties, for example tempered glass with a thickness of 4 mm to 10 mm thick, or a material ceramic from 4 mm to 10 mm thick. Alternatively, the radiating wall 600 can comprise a thermally conductive material configured to guarantee electrical insulation. For example, the radiating wall 600 can comprise a steel or aluminum carcass enclosing an oil bath, the oil itself being in contact with the heating tank 100.

According to another embodiment, the radiating wall 600 can comprise a metallic material, said radiating wall 600 being able to be structured so as to maximize the rate of convection with the air, for example with a structure of vertical fins.

According to an embodiment not shown, the radiating wall 600 can be integrated into the heating tank 100, and configured to delimit all or part of the internal volume delimited by the heating tank 100. For example, the radiating wall 600 can be directly in contact with the water contained in the internal volume delimited by the heating tank 100.

According to an embodiment represented in FIGS. 4 to 11, the radiating wall 600 comprises at least one resistive wall body 610, 620, separate from the at least one resistive tank body 130, 140 and capable of generating heat. when it is powered by an electric current delivered by the electric power supply system 350, so as to heat all or part of the radiating wall 600. The radiating wall 600 then captures all or part of the calories coming from the at least a resistive wall body 610, 620 and emits, in particular by radiation, towards the exterior of the instantaneous electric water heater A all or part of the calories captured from the at least one resistive wall body 610, 620.

According to a variant illustrated in the , the instantaneous electric water heater A comprises a single wall resistive body 610, 620. Said wall resistive body 610, 620 can be supplied with electrical energy via the electrical power supply system 350 comprising the energy storage system. electrical energy 400, and possibly other electronic components described below.

In the following description, the figures present embodiments for which the heating tank 100 comprises a first resistive wall body 610, and a second resistive wall body 620. It is however well understood that these embodiments can comprise a single wall resistive body 610, 620.

According to an embodiment illustrated in the at 11, the radiating wall 600 comprises at least a first resistive wall body 610, able to generate heat when it is powered by an alternating electric current delivered by the electrical power supply system 350, and at least a second body wall resistor 620, distinct from the first wall resistive body 610, and able to generate heat when it is powered by a direct electric current delivered by the power supply system 350.

Advantageously, the electrical energy storage system 400 may be capable of directly supplying the second wall resistive body 620 with direct electrical current, as illustrated in the figure below. .

There illustrates a variant for which the power supply system 350 comprises a step-down step-up voltage 351. The step-down-boost voltage 351 comprises a first input configured to connect the step-down step-up voltage 351 to the electrical energy storage system 400 and at least one of the following outputs:
- A first output connected to the second resistive tank body 140 and capable of supplying the second resistive tank body 140 with direct electric current;
- A second output connected to the second resistive wall body 620 and capable of supplying the second resistive wall body 620 with direct current.

According to another variant which can be implemented alternatively or jointly and represented on the , the power supply system 350 comprises a step-up inverter 352 comprising an input configured to connect the step-up inverter 352 to the electrical energy storage system 400 and at least one of the following outputs:
- A first output connected to the first resistive tank body 130 and able to supply the first resistive tank body 130 with alternating electric current;
- a second output connected to the first resistive wall body 610 and capable of supplying the first resistive wall body 610 with alternating electric current;
- a third output able to be connected to the AC electrical network B.

A third non-limiting variant that can be implemented alternatively or jointly is illustrated in the . In this variant, one of the electronic components of the electrical power supply system 350 comprises a rectifier-step-down voltage converter 353 interposed between the alternating electrical network B and at least one of the elements belonging to the group consisting of the second resistive body of the tank 140 and the second resistive wall body 620. The previously described arrangements allow the AC electrical network B to supply electrical energy to the second resistive tank body 140 and/or the second resistive wall body 620, via the step-down rectifier voltage 353. In this way, the second resistive tank body 140 and the second resistive wall body 620 can each be powered either by the electrical energy storage system 400 on the one hand, or by the AC electrical network B through the rectifier-step-down voltage 353 on the other hand.

Advantageously, the operation of the first resistive wall body 610 and of the second resistive wall body 620 simultaneously can make it possible to achieve heating powers greater than those guaranteed by heating via a single resistive wall element.

Furthermore, the arrangements previously described make it possible to recharge the electrical energy storage system 400 by the alternating electrical network B via the rectifier-step-down voltage converter 353 or by a source of renewable electricity from the power source in electrical energy S when electricity is available. In particular, the provisions according to the invention can allow the recharging of the electrical energy storage system 400 when the electrical energy available is the cheapest. Also in particular, it is possible that a strategy algorithm is configured to minimize the cost of the electrical subscription, the recharging of the electrical energy storage system 400 is carried out when the available electrical energy has an advantageous cost.

According to an embodiment illustrated in Figures 9 to 11, the instantaneous electric water heater A comprises a water conveying system 500 comprising:
- A water inlet channel 510 capable of containing water and connected to the heating tank 100 by the water inlet 110;
- a first water outlet channel 520 connected to the heating tank 100 by a first water outlet 120a and capable of being connected to at least one of the elements belonging to the group comprising an external water network and a tank water; And,
- A second water outlet channel 530 connected to the heating tank 100 by a second water outlet 120b able to be connected to an external water drainage network.

It may be advantageous to provide a water tank so that all or part of the water heated in the heating tank 100 is stored in this water tank and then reinjected into the heating tank 100 through the inlet of water 110. In particular, it is advantageous to reinject the heated water contained in the water tank through the water inlet 110 at a given moment when the demand for heated water is required, since the electrical power required for heating the water reinjected from the water tank will be lower than the electrical power required to heat the water injected from the water inlet 110 if it is not heated. In other words, the fact of reinjecting heated water contained in the water tank provides preheating of the water and contributes to minimizing the electricity consumption of the instantaneous electric water heater A.

According to a variant shown in Figures 10 and 11, the instantaneous electric water heater A comprises heat exchange elements 300 making it possible to ensure a heat exchange between on the one hand at least one of the electronic components of the system of power supply 350 and on the other hand the water contained in the internal volume delimited by the heating tank 100 and/or contained in said at least one water inlet channel 510 of the water conveying system 500.

Such heat exchange elements 300 make it possible to transfer calories captured from at least one electronic component of the electrical power supply system 350 to the water intended to enter the internal volume delimited by the heating tank 100 and/or to the water contained in the internal volume. This makes it possible reliably and economically, and despite a simple design, to optimize the thermal management of this electronic component: the calories it produces are easily evacuated, and this evacuation of calories has the advantage of preheating the water intended to enter the heating tank 100 and/or to participate in the heating of the water contained in the heating tank 100. This synergy between the evacuation of calories from the electronic component concerned to the heat exchange elements 300 and the transfer of these calories to the water to be heated contributes to the fact that the electric water heater A has a very good overall efficiency, by avoiding unnecessary heat losses.

Furthermore and synergistically, the calories captured at the level of the electrical energy storage system 400 can make it possible to increase the life of the electrical energy storage system 400 by keeping a stable temperature of the energy storage system. electrical energy 400.

According to another variant represented on the , the water conveying system 500 may comprise a water recirculation path 515 configured to fluidically connect the water inlet path 510 and the first water exit path 520. The recirculation path d water 515 may in particular comprise a recirculation valve 516 configured to allow or not the passage of water between the first water outlet channel 520 and the water inlet channel 510.

In this way, the heat exchange elements 300 can be configured to guarantee an operating temperature higher than the ambient temperature, in particular for the electrical energy storage systems 400 which require it to offer optimal operation, for example batteries LiMP (Lithium Metal Polymer) or batteries comprising solid state alloys requiring such temperatures.

According to one embodiment, the power supply system 350 can be configured to synchronize with a metering unit included in the electrical installation or with an external management server, both configured to select a power supply mode. Said supply mode can for example be configured to cap a subscribed power at the level of an electricity supply subscription, or according to constraints linked to the management of the national electricity network.

Claims (16)

Instantaneous electric water heater (A) intended to be electrically connected to an electric power supply source (S), said instantaneous electric water heater (A) comprising:
- a heating tank (100) delimiting an internal volume capable of containing water and comprising at least one water inlet (110) allowing water to enter the internal volume and at least one water outlet water (120a, 120b) allowing the water contained in the internal volume to come out of the heating tank (100),
- at least one resistive tank body (130, 140) capable of generating heat when it is powered by an electric current so as to heat all or part of the water contained in the internal volume,
- an electrical power supply system (350) able to be supplied with electrical energy by the electrical energy supply source (S) and to deliver the electrical current supplying said at least one resistive body of the tank (130, 140), the power supply system (350) comprising a plurality of electronic components interposed between the power supply source (S) and said at least one resistive body of the tank (130, 140), one of said electronic components of the electric power supply system (350) comprising an electric energy storage system (400), in particular an electric battery based on electrochemical cells and/or a power capacitor,
- a radiating wall (600) in a situation of heat exchange, in particular by conduction, with an outer surface of the heating tank (100), the radiating wall (600) capturing all or part of the calories lost by the heating tank ( 100) at said outer surface and emitting, in particular by radiation, towards the outside of the instantaneous electric water heater (A), all or part of the calories captured from said outer surface. Instantaneous electric water heater (A) according to claim 1, wherein said at least one tank resistive body (130, 140) is configured to heat the heating tank (100), and in which the heating tank (100) is configured to heat the water contained in the internal volume delimited by the heating tank (100). Instantaneous electric water heater (A) according to any one of Claims 1 or 2, in which the said at least one resistive tank body (130, 140) is in direct contact with the water contained in the internal volume delimited by the heating tank (100), and configured to directly heat the water with which it is in contact. Instantaneous electric water heater (A) according to any one of Claims 1 to 3, in which the radiating wall (600) comprises at least one wall resistive body (610, 620), separate from the at least one resistive body of the tank (130, 140) and able to generate heat when it is powered by an electric current delivered by the power supply system (350), so as to heat all or part of the radiating wall (600), the radiating wall (600) capturing all or part of the calories coming from the at least one resistive wall body (610, 620) and emitting, in particular by radiation, towards the exterior of the instantaneous electric water heater (A) while or part of the calories captured from the at least one wall resistive body (610, 620). Instantaneous electric water heater (A) according to claim 4, in which the radiating wall (600) comprises at least a first resistive body of the wall (610), able to generate heat when it is powered by an alternating electric current delivered by the electrical power supply system (350), and at least one second resistive wall body (620), distinct from the first resistive wall body (610), and capable of generating heat when it is powered by a DC electric current delivered by the power supply system (350). Instantaneous electric water heater (A) according to claim 5, in which the electrical energy storage system (400) is capable of directly supplying the second wall resistive body (620) with direct electrical current. Instantaneous electric water heater (A) according to any one of Claims 1 to 6, in which the heating tank (100) comprises at least a first tank resistive body (130) able to generate heat when it is powered by an alternating electric current delivered by the electric power supply system (350) so as to heat all or part of the volume of water contained in the heating tank (100), and at least one second resistive body of the tank (140 ) distinct from the first resistive body of the tank (130) and capable of generating heat when it is powered by a direct electric current delivered by the power supply system (350) so as to heat all or part of the volume of water contained in the heating tank (100). Instantaneous electric water heater (A) according to claim 7, in which the electrical energy storage system (400) is capable of directly supplying the second resistive body of the tank (140) with direct electrical current. An instantaneous electric water heater (A) according to claims 5 and 7, wherein the power supply system (350) comprises a step-down step-up (351) comprising a first input configured to connect the step-down step-up (351 ) to the electrical energy storage system (400) and at least one of the following outputs:
- a first output connected to the second resistive tank body (140) and capable of supplying the second resistive tank body (140) with direct current;
- a second output connected to the second resistive wall body (620) and capable of supplying the second resistive wall body (620) with direct electric current. Instantaneous electric water heater (A) according to Claims 5 and 7, or according to Claim 9, in which the electric power supply source (S) comprising an alternating electric network (B), the electric power supply system ( 350) comprises a step-up inverter (352) comprising an input configured to connect the step-up inverter (352) to the electrical energy storage system (400) and at least one of the following outputs:
- a first output connected to the first resistive tank body (130) and capable of supplying the first resistive tank body (130) with alternating electric current;
- a second output connected to the first resistive wall body (610) and capable of supplying the first resistive wall body (610) with alternating electric current;
- a third output adapted to be connected to the AC electrical network (B). Instantaneous electric water heater (A) according to Claims 5 and 7, or according to any one of Claims 9 or 10, in which the electric power supply source (S) comprising an alternating electric network (B), the one of the electronic components of the electrical power supply system (350) comprises a rectifier-step-down voltage converter (353) interposed between the alternating electrical network (B) and at least one of the elements belonging to the group consisting of the second resistive body of tank (140) and the second wall resistive body (620). Instantaneous electric water heater (A) according to any one of Claims 1 to 11, comprising a water conveying system (500) comprising:
- a water inlet channel (510) capable of containing water and connected to the heating tank (100) by the water inlet (110);
- a first water outlet path (520) connected to the heating tank (100) by a first water outlet (120a) and capable of being connected to at least one of the elements belonging to the group comprising a network of outdoor water heater and a water tank;
- a second water outlet path (530) connected to the heating tank (100) by a second water outlet (120b) adapted to be connected to an external water drainage network. Instantaneous electric water heater (A) according to claim 12, comprising heat exchange elements (300) making it possible to ensure a heat exchange between on the one hand at least one of the electronic components of the electrical power supply system ( 350) and on the other hand water contained in the internal volume delimited by the heating tank (100) and/or contained in said at least one water inlet channel (510) of the conveying system of water (500). Installation comprising an instantaneous electric water heater (A) according to any one of Claims 1 to 13, and an electric energy supply source (S) supplying electricity to the instantaneous electric water heater (A). Installation according to claim 14, in which the electrical energy supply source (S) comprises an alternating electrical network (B). Installation according to any one of claims 14 or 15, in which the electrical energy supply source (S) comprises a continuous electrical energy source comprising at least one element belonging to the group comprising: a fuel cell, a battery based on electrochemical cells, at least one photovoltaic panel, one large capacity capacitor.