WO2020016489A1

WO2020016489A1 - Water heating system with renewable energy preheating supplemented by instantaneous heating

Info

Publication number: WO2020016489A1
Application number: PCT/FR2019/000117
Authority: WO
Inventors: Damien GARRIDO; Vincent BOGDAN; Pascal MONTGERMONT; Sébastien LE GAREC
Original assignee: Atlantic Industrie
Priority date: 2018-07-20
Filing date: 2019-07-19
Publication date: 2020-01-23
Also published as: FR3084142B1; FR3084142A1; EP3824227A1

Abstract

The invention relates to a heating system comprising: - a renewable energy water heater (11) which comprises at least one water storage container comprising at least one tank (13a) containing water that has a cold water inlet (15) and a hot water outlet (13c), and a device for preheating the water of the tank, - a device for supplementary instantaneous heating (19) of the previously preheated water which is positioned inside said at least one water storage container (13), separately from the tank and over the hot water outlet of said tank.

Description

RENEWABLE ENERGY PREHEATING WATER HEATING SYSTEM WITH INSTANTANEOUS HEATING SUPPLEMENT

The invention relates to a water heating system.

Domestic installations are known in which the sanitary water heating system comprises a renewable energy water heater of the thermodynamic water heater type.

Such water heaters have a tank in which the water is heated. The user who wishes to take a shower takes hot water from the tank. In some countries, for good comfort of use, the temperature of the water taken must be around 70 ° C.

When the storage capacity of the tank is between 30 and 300 liters and all, or almost all, of the hot water in the tank has been previously consumed by one or more people, a new user must wait until the tank water heats up to the desired temperature before water is available at the desired temperature. The waiting time can easily be around 30 minutes for small capacities and several hours for large capacities, which can be problematic for the new user depending on their time constraints.

I I therefore there is a need to allow a user of such a heating system to be able to obtain hot water more quickly than before, in particular for taking a shower.

The present invention thus relates to a heating system comprising: - a renewable energy water heater which comprises at least one water storage tank comprising at least one tank containing water having a cold water inlet and a hot water outlet, and a device for preheating the water in the tank with renewable energy,

- a device for instantaneous heating complementary to the preheated water which is arranged inside said at least one water storage tank, separately from the tank and on the hot water outlet from said tank. Thus, the water which is withdrawn by the user is for example heated in two stages:

-first, the water is preheated by the water preheating device of the renewable energy water heater to a given temperature (for example 50 ° C) which is lower than the comfort or use temperature at which the user will use the water, and

-secondly, the water already preheated undergoes additional heating, internal to the balloon of the water heater and out of the tank, via the instantaneous heating device, up to the desired comfort or use temperature (for example 70 ° C).

Preheating makes it possible to heat a given volume of water (eg 80L) from an initial temperature (for example between 5 and 30 ° C), to an intermediate temperature (for example 50 ° C), taking advantage of the gain energy of renewable energy in its maximum efficiency. This also makes it possible to reduce the operating time mainly on thermodynamic water heaters whose heating time would be greater than 12 h to reach temperatures of the order of 70 ° C. Indeed, the best energy performance of a renewable energy water heater is achieved at the start of the heating operation and drops when the fluid reaches a certain temperature (for example 50 ° C). The system according to the invention therefore exploits the energy performance of the renewable energy water heater in its phase where it is most efficient. The installed power of the water heater can thus be reduced while maintaining a reasonable heating time of less than 10 h, and making it possible to reduce its cost (by selecting less energy-consuming components such as the fan and the compressor of the thermodynamic circuit), as well as the water storage volume of the tank.

The instantaneous heating device then provides additional heating (outside the tank) of the preheated water on the tank water outlet circuit from the intermediate temperature (for example 50 ° C) to the temperature of comfort or use (for example 70 ° C). This instantaneous additional heating makes it possible to instantly raise the temperature of the water coming from the tank according to the flow of use and the power of the heating. complementary (for example 21.5 ° C for 4500 W with a flow rate of 3 l / min). In renewable energy it takes a very long time to obtain the same result with low system yields. For example, for a thermodynamic water heater with a power of less than 400 W on an 80-liter tank, it takes more than 3 hours with COPs lower than 1.5 to go from 50 ° C to 70 ° C.

The user obtains hot water at the desired temperature (comfort or use) more quickly than with a conventional renewable energy water heater which would be used to carry out all of the heating.

As the tank water is water which has been preheated (generally in the tank) to an intermediate temperature between the initial temperature and the comfort temperature, the temperature of the stored water is reduced compared to the desired temperature ( comfort or use). The energy losses or static losses of the tank are therefore reduced compared to a configuration in which an electrical resistance would be placed inside the tank, would heat the water in the tank to the temperature desired by the user and would therefore be subject to heat loss while waiting to be used. Thanks to the invention, the additional instantaneous heating device is located outside the tank and it only heats the volume of water leaving the tank through the hot water outlet (in the case of drawing or drawing off by the user) in order to bring this volume of water to the desired temperature. The volume of water thus heated is therefore not stored (it is therefore not subjected to heat losses and therefore retains its temperature) since it is directly used by the user.

In addition, this reduced storage temperature improves the life of certain components, in particular by reducing the operating time of critical components (eg pump, compressor, valves ...) and reduces the phenomena of scaling of the tank.

Furthermore, when the tank is made of enamelled steel, an improvement in the corrosion resistance of the tank can be observed due to this reduced storage temperature. The internal enamel coating of the tank is therefore less likely to be degraded over time. Furthermore, thermoplastic coatings can be envisaged to protect the tank.

Integrating the additional instantaneous heating device in the storage tank (but outside the storage tank) allows a one-piece solution, compared to a configuration in which the additional instantaneous heating device would be outside the storage tank. The tank internally integrating the tank and the additional instantaneous heating device thus offers a compact and less bulky arrangement than with the external device. It also follows a simplified installation / installation.

Generally, a water storage tank in a heating system according to the invention comprises one or more tanks containing water which are enclosed inside an external envelope or covering.

According to other possible characteristics:

- the renewable energy water heater is a thermodynamic water heater and the water is generally heated in the tank;

- the renewable energy water heater is a solar water heater for example with thermosyphon or with recirculation pump and the water water is generally heated in the tank;

- the instantaneous heating device is an electric instantaneous water heater;

said at least one water storage tank comprises the tank and an internal part of the tank which is separate from the tank and which contains the additional instantaneous heating device; the separate part of the tank serving as a housing for the additional instantaneous heating device can thus form a separate compartment inside the same envelope containing the tank; the separate part of the tank and serving as a housing for the additional instantaneous heating device can be delimited by a cover or cover which is mounted on the tank and contains said device;

the separate part of the tank communicates with said tank by means of the hot water outlet from the tank; the additional instantaneous heating device is thus placed on the hot water outlet pipe or pipe leaving the tank and the water leaving the tank therefore passes necessarily in said device;

the system comprises a temperature reducer placed on the hot water outlet from the tank, upstream of the additional instantaneous heating device in the direction of circulation of the hot water; the temperature reducer is also placed outside the tank but in the flask and, for example, in the internal part of the flask which is separated from the tank; the temperature reducer makes it possible to avoid, in the event of too high a temperature of the water stored in the tank (depending for example on the countries where the tank is installed, the water in the tank can reach very high temperatures, for example of the order of 90 ° C), to engage the safety of the additional instantaneous heating device when the water leaving the tank enters the latter;

the temperature reducer is for example a water mixing device which is able to mix the hot water from the hot water outlet of the tank with cold water in order to reduce the temperature of the incoming water in the additional instantaneous heating device; by way of example, the cold water arriving on the mixing device is taken from the cold water inlet from the tank;

the heating system comprises a system for controlling or regulating the preheating actions by the device for preheating the water of the water heater and / or for additional heating of the water preheated by the additional instantaneous heating device.

The present invention also relates to an assembly comprising a sanitary installation and a water heating system connected to the sanitary installation. The water heating system conforms to the heating system briefly outlined above.

The present invention further relates to a method for managing a water heating system in accordance with the heating system briefly described above. The method is characterized in that it comprises the following steps: -comparison between the water temperature value Tes at the output of said complementary instantaneous heating device and a user set water temperature value for the complementary instantaneous heating device Tci, -activation of the complementary instantaneous heating device when the water temperature value Tes at the output of said additional instantaneous heating device is lower than the set water temperature value Tci and deactivation of the additional instantaneous heating device otherwise. According to other possible characteristics:

the comparison step occurs when a water withdrawal by the user is detected;

- when the water temperature value Tes at the output of said additional instantaneous heating device is lower than the set water temperature value Tci, the method comprises a step of comparison between the water temperature measured in the tank Tes and the set temperature of the tank Tcc in order to determine, as a function of the result of the comparison, whether the water heater should be activated / kept in operation or deactivated;

when no water withdrawal is detected or when the water temperature value Tes at the output of said complementary instantaneous heating device is greater than the set water temperature value Tci, the method comprises a step of comparison between the water temperature measured in the Tes tank and the set temperature of the Tcc tank;

the process comprises a step of activating or keeping the water heater in operation in order to preheat the water which will be stored in the tank when the water temperature measured in the tank Tes is lower than the set temperature of the Tcc tank and a step to deactivate the water heater otherwise. Other characteristics and advantages will appear during the description which follows, given solely by way of example and made with reference to the appended drawings, in which:

FIG. 1 is a general schematic view of a block diagram of a water heating system according to the invention;

FIG. 2 illustrates an embodiment of the water heating system according to the invention showing the additional instantaneous heating device inside the envelope of the storage tank;

FIG. 3 illustrates an application of the water heating system according to the invention where the water heater is of the thermodynamic type;

FIGS. 4a and 4b illustrate two applications of the water heating system where the water heater is of the solar thermosyphon type;

FIG. 5 illustrates a possible application of a heating system according to the invention to a sanitary installation;

FIG 6 is a more detailed view of the block diagram of the system of Figure 1 and which relates to the embodiment of Figure 2;

FIG. 7 illustrates in the form of functional blocks a water heating system according to an embodiment of the invention;

FIGS. 8, 9 and 10 illustrate different possible modes of operation of a water heating system according to an embodiment of the invention;

FIGS. 11 a, 11 b and 11 c illustrate three applications of the integrated system of FIG. 2 where the water heater is of the solar thermosyphon type or with a pump.

Figure 1 schematically illustrates a block diagram of a water heating system 10 according to the invention and which comprises;

a renewable energy water heater 12 which comprises a sanitary water storage tank comprising a tank 14 provided with a cold water inlet 16 and a hot water outlet 18, and a known preheating device water contained in the tank (not shown in FIG. 1 and which can be formed by one or more heating resistors in steatite or not), a device 20 for instantaneous heating complementary to the preheated water which is arranged on the hot water outlet circuit outside the tank.

In Figure 1 the device 20 is shown outside of the balloon 12 for the convenience of the presentation and explanation of the principle of the invention but it should be noted that the device 20 is generally contained in the balloon in the sense of the invention. It is the same for Figures 3, 4a-b, 5 and 6 where the additional instantaneous heating device has also been shown outside the balloon while it is integrated therein.

The balloon of the water heater 12 generally comprises at least one tank, that is to say that it can include one or more tanks which will be referred to simply as "tank" subsequently. It is the same for all the embodiments of the invention. The tank is surrounded by an envelope or enclosure which constitutes the covering. This covering may include a thermal insulator (eg polyurethane foam) around the tank and a sheet arranged around the insulator with a cover installed below the tank.

In the schematic diagram of Figure 1 the additional instantaneous heating device is shown downstream of the hot water outlet 18 of the tank and it is generally always arranged inside the storage tank (outside the tank) , on the preheated water outlet circuit, as shown in Figure 2.

In FIG. 2 the balloon 13 of the renewable energy water heater 11 has inside a tank 13a provided, on the one hand, with a cold water inlet 15 which is connected at the inlet of the balloon and which extends inside said tank in the form of a pipe / pipe 13b which passes through part of the tank until it enters the tank 13a and, on the other hand, a hot water outlet 13c. All the characteristics of the balloon in Figure 1 also apply to the balloon in Figure 2.

The tank 13a contains or is associated with a known device for preheating the water contained therein (not shown in FIG. 2). The water stored in the tank can be preheated in said tank or be preheated elsewhere and then be brought into this tank. The tank 13 also includes a second part 13d separate from the tank 13a, arranged for example below the tank, communicating with the tank via a pipe or hydraulic connection element 13c which forms the outlet for hot water from the tank. The preheated water which is contained in the first part 13a of the tank leaves this part through the element 13c and enters the second part 13d.

The lower part 13d is for example delimited by a cover which is fixed under the tank and to the latter by known means. The lower part can thus form an internal compartment of the balloon which is physically separated from the tank and an envelope specific to the balloon can surround the tank and this other part (lower or not) or compartment separate from the tank.

The part 13d contains a device 19 for instantaneous heating complementary to the preheated water which is arranged on the hot water outlet circuit and, more particularly, is connected, on the one hand, to the element 13c to receive as input the preheated water stored (the connection between the outlet 13c and the inlet of the device 19 can be more or less long) and, on the other hand, at the hot water outlet 17 of the tank to deliver from the storage tank 13 of water heated to a given temperature desired by a user (the hot water outlet circuit of the tank includes the element 13c leaving the tank to the outlet 17 of the device 19 and also of the envelope of the balloon). The device 19 which is integrated into the internal volume of the balloon (internal to its envelope) by being housed in a part or compartment separate from the storage tank thus gives the balloon a unitary monobloc appearance which is capable of being transported in one piece by an installer.

Other embodiments of an additional instantaneous heating device arranged inside a balloon of water heaters with renewable energy but outside of the tank of this balloon are of course conceivable. For example, the part 13d containing the instantaneous heating device may not be located below the tank but above the tank (for example when the balloon is placed on the ground), or even it may be arranged along the tank (for example vertically) for reasons of space. Everything that has been described above about the game lower 13d of the balloon applies, whatever the configuration of this part and its arrangement in the balloon.

In the description of Figure 1 and Figure 2 the renewable energy water heater can be of any type. By way of example, FIG. 3 illustrates a thermodynamic water heater known per se (heat pump) and FIGS. 4a and 4b illustrate solar water heaters with thermosyphon also known per se, with the exception of the presence of an additional instantaneous water heating device. In FIG. 3, the complementary device 20 is represented on the outside of the storage tank as in FIG. 1 (for the sake of convenience of the description) but it is generally always placed inside this storage tank ( inside the envelope of the latter or of a specific casing) and outside the tank as in FIG. 2. The same is true for the heating systems of FIGS. 4a-b. FIGS. 11 a-c more particularly illustrate the presence of an additional device for instantaneous heating of water inside the water storage tank.

More particularly, the thermodynamic water heater of FIG. 3 comprises a thermodynamic circuit in which a refrigerant circulates and which comprises, in known manner, successively in the direction of circulation of the fluid:

-a condenser C1 disposed around the tank of the balloon 14 (in an exemplary embodiment the condenser can be produced in the form of an annular belt comprising a plurality of channels parallel to each other and wound around the tank; alternatively, the condenser can be placed inside the tank);

a detent member C2 such as a regulator;

an evaporator C3 which is for example in contact with outside air in order to extract calories therefrom;

a compressor C4 compressing the fluid before its condensation in the condenser C1 where the fluid transfers its calories to the water contained in the tank.

The thermodynamic circuit, via its condenser, forms the device for preheating the water in the tank. The solar water heaters of Figures 4a and 4b respectively illustrate a thermodynamic solar water heater:

-of closed type (fig. 4a) in which the water from a primary circuit collects calories in a solar panel and passes through an exchanger (not shown) in a tank or around the tank (called a double jacket) of the balloon storage for heating domestic water;

-Open type (fig.4b) in which the sanitary water circulates in the solar panel and goes directly into the tank of the storage tank to heat the sanitary water.

These two water heater systems operate without a pump but by gravity using the difference in density between hot and cold water.

In the two systems illustrated, the instantaneous heating device is placed outside the water storage tank for the sake of convenience, but it is generally always placed inside the tank (inside the 'envelope of the balloon or a specific cover), as illustrated in Figures 11 ac.

More particularly, the closed-type solar water heater (FIG. 4a) 30 comprises a storage tank which comprises a water storage tank 32 containing a heat exchanger not shown and a solar panel 34 connected to the inlet and at the outlet of the exchanger respectively by lines 36 and 38.

The tank 32 is equipped with a cold domestic water inlet pipe 40 and a hot domestic water outlet 42.

The heating system of FIG. 4a further comprises on the outlet 42, outside the tank 32, an instantaneous water heating device 44 similar to the device 20 of FIGS. 1 to 3 and which has the same advantages.

The system also optionally includes a temperature reducer 46 disposed on the outlet 42 upstream of the inlet 44a of the device 44. The temperature reducer makes it possible to prevent excessively hot water from entering the device. instantaneous heating 44 and activates the safety of said device 44. It should be noted here that the cold water supply is also connected to the temperature reducer 46. The reducer temperature 46 is here a mixing device or mixer which mixes the hot water leaving the tank with cold water.

The device 44 supplies domestic hot water at the final temperature desired by the user via the outlet pipe 44b.

The open-type solar water heater (FIG. 4b) 50 comprises a storage tank which comprises a water storage tank 52 and a solar panel 54 supplied as input by a cold domestic water supply 56 and which is connected in outlet to tank 52 via line 58.

The tank 52 is equipped with a sanitary hot water outlet 60 on which is optionally mounted a temperature reducer 62, upstream of the inlet 64a of an instantaneous water heating device 64.

The device 64 supplies domestic hot water at the final temperature desired by the user via the outlet pipe 64b.

In the two systems of FIGS. 4a-b, the device for preheating the water in the tank using renewable energy comprises the solar panel (s) and the exchanger (when it is present) and the circuit with the pipes connecting these components between them.

As a variant not shown, a solar water heater equipped with an additional instantaneous heating device can also include a pump making it possible to circulate the water between the tank of the water heater and the solar panel (solar system with forced operation ). The operation is identical to the thermodynamic version.

Returning to FIGS. 1 to 3, the additional instantaneous heating device 20 is for example an instantaneous water heater of the electric type.

The power of this device is sized according to the additional heating needs and in particular according to the capacity of the tank 14.

This device 20 is for example composed of an electrical resistance (the electrical power is for example between 3 and 4.5 KW although other values of electrical power can be envisaged) disposed inside an envelope or enclosure in which the water from outlet 18 (or outlet 13c in FIG. 2) circulates. The water thus heated leaves the device 20 via outlet 20a (or via outlet 17 in FIG. 2) in order to be routed to an equipment where the user can use this hot water directly or else mixed with another water.

Alternatively, the device 20 can be of another type not shown here.

The above concerning the device 20 also applies to the additional instantaneous heating device of FIGS. 4a and 4b and 11 a- c.

FIG. 5 represents a possible example of an assembly comprising, on the one hand, a sanitary installation IS which notably comprises an ID shower installation and, on the other hand, a water heating system such as that of FIG. 1 (or that of Figures 2, 3, 4a-b and 11 ac). The system 10 of FIG. 1 is connected to the shower installation by a pipe 11.

This assembly includes upstream a source of water S (ex sanitary water network, etc.) which in particular feeds system 10 through a pipe I2.

The ID installation also includes two hot water supply points P1 and P2 (these can be taps for sinks, sinks, etc.) connected to system 10, downstream of it, just like the shower installation.

The instantaneous heating provided by the device 20 thus allows the user of the shower, as well as the user of the water points P1 and P2, to obtain hot water at the desired temperature more quickly than before. and with all the advantages described above (in particular before enumerating the figures) or below.

A system for controlling or managing the water heating system according to one embodiment of the invention is provided in order to control the preheating actions by the preheating device of the renewable energy water heater and / or additional heating. by the device 20 or the like of the other figures. In other words, this system regulates the operating priorities between the two devices when desired.

This system can be mechanical (for example using a mechanical thermostat which determines the device to be activated for heating or which decides to activate both devices) or electronic (for example by using relays to control the power supply of the devices for their heating ...).

FIG. 6 illustrates in more detail than FIG. 1 various internal components of the renewable energy water heater 12 and of the additional instantaneous heating device 20 which is generally always placed inside the storage tank and outside the tank ( all that is described with respect to the device 20 also applies to the device 19 of FIG. 2 as well as to the similar devices of the other FIGS. 3, 4a-b, 5 and 11 ac). The geometric proportions between the water heater and the device 20 have been deliberately exaggerated in order to make visible the various components internal to the device which, generally, is of a reduced volume compared to that of the tank.

The water heater 12 which can alternatively be of the solar type comprises for example an electronic card 21 on which a temperature set point 22 (Tcc) can be fixed (in the factory) or adjustable by the user (by a wheel or keys setpoint changes) for preheating the water in the storage tank 14 of the tank.

A temperature probe 23 is placed inside or on the surface of the tank in order to measure the temperature of the water Tec therein. The probe is arranged to allow the operation of the renewable energy preheating system and can provide an indication of the temperature Jec. According to an alternative embodiment, a second probe 23a is placed at the bottom, at the outlet of the storage tank of the tank (option 1) to indicate the exact temperature of entry into the instant heating system 10 or at the top ( option 2). The second probe 23a connected to the electronic card will fulfill the same function as the probe 23 but with more precision due to its positioning.

On the outlet pipe 18 which connects the tank 14 of the flask to the device 20 a pre-set (optional) temperature reducer 24 is positioned.

The device 20 can more particularly comprise, and successively on the supply of water to the device, a flow detector 25, an internal water circulation circuit comprising at least one electrical resistance 26 and, downstream of the latter , a temperature probe 27, for example located inside the device, on the water which has been heated by the resistance, upstream of the outlet 20a. The probe 27 measures a water temperature Tes at the outlet from the device 20 (water withdrawal or drawing temperature which corresponds substantially to the temperature of use of the water).

The device 20 may further comprise a thermal safety device 28 disposed on the tank comprising the electrical resistance or at the outlet of the water heating system. The function of thermal safety is to cut off the heating function performed by the electrical resistance in the event of a predetermined temperature being exceeded.

The device 20 further comprises an electronic card 29 which is connected to various components of the device for its operation alone and / or in cooperation with the water heater 12. In order not to overload the drawing, the card 29 is not shown in conjunction with the components in Figure 6.

A setpoint C (setpoint temperature Tci) is also accessible to the user for adjusting the desired final temperature for the water leaving the device 20. This setpoint is generally located outside the enclosure of the device 20 and can take the form of a man-machine interface with display or simple buttons or an adjustment wheel to raise or lower the setpoint temperature Tci.

It will be noted that some of the components internal to the device 20 can be omitted or arranged differently inside the enclosure of the device, or even outside of the enclosure for certain components.

FIG. 7 illustrates in the form of functional block diagrams of the possible interactions between the electronic cards of the instantaneous heating device and of the water heater as well as between each of the cards and certain components of the device and of the water heater. The respective supplies of the instantaneous heating device and of the water heater are respectively denoted A1 and A2 and supply the electrical supply to each card as well as to certain components even if this is not shown in the figure.

In general, the user indicates a desired temperature setpoint Tci on the instantaneous heating device 20 (of the device 19 of FIG. 2 or of similar devices of the other Figures 3, 4a-b and 11 ac). As illustrated in FIG. 7, the following information is supplied to the electronic card 29 of the device 20:

a flow supplied by the flow detector or flow meter 25 (it can be a simple contact established by a float),

-the selected temperature setpoint Tci,

-an outlet temperature supplied by probe 27.

Note that if no flow or too low a flow is detected by the detector 25 the device 20 is stopped.

If the setpoint temperature Tci is lower than the outlet temperature measured by the probe 27, a system regulation process is set up.

In the context of system operation with priority given to the instantaneous heating device, the information is supplied by the electronic card 29 of the device 20 to the electronic card 21 of the water heater 12 or to a relay.

If the instant heater is in operation, the renewable energy water heater is shut down.

If the instant heater is off, the renewable energy water heater can be turned on / off.

In the case where the temperature setpoint of the renewable energy water heater Tcc is lower than the temperature measured by the probe 23 (and possibly the probe 23a) of this water heater, then the latter can operate to heat the water of tank. Otherwise the water heater is stopped.

The two electronic cards of the instantaneous heating device and the water heater can be combined on a single electronic card.

It will be noted that what has just been described with reference to FIGS. 6 and 7 applies to all the systems described above and below and in particular to those relating to a solar water heater with a pump. In the case of a thermosiphon solar water heater, the two heating systems (solar and instantaneous) are independent for their operation, and one of the two systems does not have priority over the other. We will now describe in relation to FIGS. 8 to 10 different possible operating modes of the instant heating device and of the renewable energy water heater according to the invention and which apply to all the systems described above and below. after. Figures 8 to 10 are presented in the form of steps of several algorithms.

FIG. 8 illustrates a procedure in which the complementary instantaneous heating device operates when the renewable energy water heater does not work and vice versa (with priority of heating to the instantaneous device).

The algorithm of FIG. 8 begins with a first step S1 of detection (for example controlled by the float 25 of the instantaneous water heater 20) of a drawing or drawing of water downstream of the heating system according to the invention ( whether it is that of FIG. 5, for example at the level of the shower installation or of any one of the draw points P1, P2... or any of the systems previously described).

In the event of detection, this step is followed by a step S2 of comparison between the withdrawal temperature Tes (Temperature Tes supplied for example by the probe 27 in the case of FIG. 6) and the set temperature Tci indicated by the user on the instant heater 20.

When the temperature Tes is lower than the set temperature Tci, the preheater of the water heater 12 is deactivated in order to stop the water heater 12 and the instant heating device operates and regulates the temperature so that the temperature of water leaving the device reaches the setpoint Tci (step S3).

When the temperature Tes is greater than or equal to the setpoint temperature Tci, step S2 is followed by a comparison step S4 which occurs when no drawing is detected during the test of step S1.

During step S4, it is determined whether the temperature measured in the tank Tec (temperature supplied for example by the probe 23 in the case of FIG. 6) is lower than the set temperature of the tank Tcc (for example 55 ° VS) . If so, this step is followed by a step S5 during which the instantaneous heating device is deactivated (no withdrawal) and the water heater preheating device operates.

Step S5 is followed by step S4 already described for regulating the water temperature of the tank 14.

In the case where the temperature measured in the tank is greater than or equal to the set temperature of the tank Tcc, step S4 is followed by a step S6 during which the device for preheating the water heater is thus deactivated. than the instant heater.

In this operating mode, the maximum electrical power corresponds to the electrical power of the instantaneous heating device.

FIG. 9 illustrates a mode of operation in which the renewable energy water heater can operate or not when the complementary instantaneous heating device is operating (operating mode independent of the two heaters).

The algorithm of FIG. 9 begins with a first step S10 of detecting a drawing or drawing of water downstream of the heating system according to the invention (be it that of FIG. 5, for example at the level of l 'shower installation, or any of the draw points P1, P2 .... or any of the systems described above).

In the event of detection, this step is followed by a step S11 of comparison between the withdrawal temperature Tes (temperature Tes supplied for example by the probe 27 in the case of FIG. 6) and the setpoint temperature Tci indicated by the user on the instant heater 20.

When the temperature Tes is lower than the set temperature Tci, this step is followed by a step S12 of comparison between the temperature measured in the tank Tec (temperature supplied for example by the probe 23 in the case of FIG. 6) and the set temperature of the tank Tcc (for example 55 ° C).

If so, this step is followed by a step S13 during which the preheater of the water heater operates and the instant heater can operate and the outlet temperature of this the latter is regulated so that the water temperature leaving the device reaches the setpoint Tci.

In the case where the temperature measured in the tank (by the probe 23 and optionally 23a) is greater than or equal to the set temperature of the tank Tcc, step S12 is followed by a step S14 during which the device heater preheating is deactivated (water heater 12 off) and the instant heating device can operate and the outlet temperature of the latter is regulated so that the water temperature at the outlet of the device reaches the value Tci setpoint.

Returning to step S1 1, when the temperature Tes is greater than or equal to the set temperature Tci, step S11 is followed by a comparison step S15 which occurs when no drawing is detected during the test from step S10.

During step S15, it is determined whether the temperature measured in the tank Tec (temperature supplied for example by the probe 23 in the case of FIG. 6 and optionally 23a) is lower than the set temperature of the tank Tcc (by example 55 ° C).

If so, this step is followed by a step S16 during which the instant heating device 20 is deactivated and the preheater of the water heater 12 operates.

Step S16 is followed by step S15 already described for regulating the water temperature of the tank.

In the case where the temperature measured in the tank is greater than or equal to the set temperature of the tank Tcc, step S15 is followed by a step S17 during which the device for preheating the water heater 12 is deactivated as well as the instantaneous heating device 20.

In this operating mode, the maximum electric power corresponds to the sum of the electric power of the instantaneous heating device 20 and the electric power of the preheating device of the water heater 12.

FIG. 10 illustrates a procedure in which the complementary instantaneous heating device 20 operates in cooperation with a renewable energy water heater of the solar type with thermosiphon like those of FIGS. 4a-b and 11 ab. The algorithm of FIG. 10 begins with a first step S20 of detecting a drawing or drawing of water downstream of the heating system according to the invention (be it that of FIG. 5, for example at the level of l 'shower installation, or any of the draw points P1, P2 .... or any of the systems described above).

In the event of detection, this step is followed by a step S21 of comparison between the withdrawal temperature Tes (temperature Tes supplied for example by the probe 27 in the case of FIG. 6) and the set temperature Tci indicated by the user on the instant heater 20.

When the temperature Tes is lower than the set temperature Tci, this step is followed by a step S22 during which the instant heating device operates and the outlet temperature of the latter is regulated so that the water temperature in output of the device reaches the setpoint Tci.

When the temperature Tes is greater than or equal to the setpoint temperature Tci, step S21 is followed by a step S23 which occurs when no drawing is detected during the test of step S10 and which provides for the deactivation of the instant heating device.

In this operating mode, the maximum electrical power corresponds to the electrical power of the instantaneous heating device. The thermosyphon solar water heater has an energy function (it is not regulated) and is autonomous.

It will be noted that the description of FIGS. 1 to 10 also applies to the case of a heating system in which the renewable energy water heater comprises several storage tanks mounted in series, the instantaneous heating device being disposed on the outlet. hot water from the last tank in the order of circulation of the water in the circuit.

Figures 11 a-c illustrate three applications of the integrated system of Figure 2 where the water heater is of the solar type.

Figures 11a and 11b show the heating systems of Figures 4a and 4b, referenced here Sa and Sb, respectively with the additional instantaneous heating device inside the water storage tank. The corresponding elements have the same references. A hood or cover 45 in FIG. 11 a (46 in FIG. 11 b) mounted on the storage tank of the balloon contains inside the balloon in a separate housing or compartment the additional instantaneous heating device 44 in FIG. 11a (64 in Figure 1 1 b) and the optional temperature reducer 46 in Figure 1 1 a (62 in Figure 11 b).

FIG. 11 c illustrates a heating system 70 with a solar pump water heater in which the storage tank 72 contains a water storage tank 74 and, separately, inside a cover 76 or separate compartment, the additional instantaneous heating device 78 and an optional temperature reducer 80.

The system 70 also includes a circuit 82 which includes a solar panel 84, a heat exchanger 86 internal to the tank for preheating the water in the tank by the heat captured by the panel, a pump 88 for circulating circuit water and pipes or conduits connecting the various circuit components together.

A cold water inlet pipe 90 is connected to the tank and is also connected to the inlet of the optional temperature reducer 80 so that the cold water mixes with the preheated water leaving the hot water outlet 75 from the tank, thus making it possible to bring hot water but at a reduced temperature (so as not to engage the security system of the complementary instantaneous heating device 78) at input 77 of the device 78.

In the systems of FIGS. 11 ac, the device for preheating the water of the tank by renewable energy comprises the solar panel or panels, the exchanger (when it is present), the pump (when it is present) as well than the circuit with the pipes connecting these components together.

All the storage tanks of the systems illustrated in FIGS. 2 and 11 a-c make it possible to integrate the complementary instantaneous heating devices and to protect them in a single and same envelope. It is the same for the systems illustrated in the other figures although the complementary instantaneous heating devices are not shown in the storage tank.

Claims

RESELL I CATIONS

1. Heating system (10) comprising:

- a renewable energy water heater (11; 12; 30; 50) which comprises at least one water storage tank comprising at least one tank (13; 14; 32; 52) containing water having an inlet cold water (15;

16; 40; 56) and a hot water outlet (13c; 18; 42; 60), and a device for preheating the water in the tank with renewable energy,

- an additional instantaneous heating device (19; 20; 44; 64) of the preheated water which is arranged inside said at least one water storage tank (13), separate from the tank and on the hot water outlet of said tank.

2. Heating system according to claim 1, characterized in that the renewable energy water heater is a thermodynamic water heater (1 1; 1 2).

3. Heating system according to claim 1, characterized in that the renewable energy water heater is a solar water heater (30; 50).

4. Heating system according to one of claims 1 to 3, characterized in that the additional instantaneous heating device is an electric instantaneous water heater (19; 20; 44; 64).

5. Heating system according to one of claims 1 to 4, characterized in that said at least one water storage tank comprises the tank and a part which is separated from the tank and which contains the additional instantaneous heating device .

6. Heating system according to claim 5, characterized in that the separate part of the tank communicates with said tank via the outlet of hot water from the tank.

7. Heating system according to one of claims 1 to 6, characterized in that it comprises a temperature reducer placed on the water outlet from the tank, upstream of the additional instantaneous heating device in the direction of circulation of the hot water.

8. Heating system according to claim 7, characterized in that the temperature reducer is a water mixing device which is capable of mixing hot water from the hot water outlet of the tank with water cold.

9. Heating system according to one of claims 1 to 8, characterized in that it comprises a system for controlling the preheating actions by the device for preheating the water of the water heater and / or additional heating of water preheated by the additional instantaneous heater.

10. Assembly comprising a sanitary installation and a water heating system connected to the sanitary installation, the heating system being in accordance with one of claims 1 to 9.

11. Method for managing a water heating system according to one of claims 1 to 9, characterized in that it comprises the following steps:

comparison between the water temperature value Tes at the output of said complementary instantaneous heating device and a user set temperature water value for the complementary instantaneous heating device Tci,

-activation of the additional instantaneous heating device when the water temperature value Tes at the output of said additional instantaneous heating device is lower than the set water temperature value Tci and deactivation of the additional instantaneous heating device otherwise .

12. Method according to claim 11, characterized in that the comparison step occurs when a drawing of water by the user is detected.