WO2014044864A1

WO2014044864A1 - Domestic water heating facility having a heating function

Info

Publication number: WO2014044864A1
Application number: PCT/EP2013/069795
Authority: WO
Inventors: Mihai Radulescu; Catherine MARTINLAGARDETTE; Cédric TEUILLIERES
Original assignee: Electricite De France
Priority date: 2012-09-24
Filing date: 2013-09-24
Publication date: 2014-03-27
Also published as: FR2995979A1; FR2995979B1

Abstract

The present invention concerns a domestic water heating facility comprising a domestic hot water tank (100), a heat source (300), a refill loop (130) combined with the heat source (300) and the hot water tank (100) and a heating loop (140) connected to the hot water tank (100), characterised in that the refill loop (130) and the heating loop (140) communicate directly with the internal volume of the domestic hot water tank (100) and in that direct connections (500, 600) are provided between the refill loop (130) and the heating loop (140), brought selectively into service when allowed to do so by the measured temperature of the domestic hot water.

Description

Installation of sanitary water heater with heating function

The present invention relates to the field of domestic hot water production devices.

A large number of hot water production devices have already been proposed.

In particular, we have proposed many devices for producing domestic hot water including a hot water tank associated with a charging loop comprising a heat pump (PAC).

Such devices are described for example in particular in documents CA 2754683, CN 201903116 and JP 2011169584.

Attempts have also been made to couple such devices for producing domestic hot water with heating circuits in order in particular to take advantage of the thermal storage capacity associated with domestic hot water tanks.

Examples of such proposals are described in EP 2397778, WO2008 / 130306 and JP 2011141076.

None of the known devices, however, give complete satisfaction.

Documents EP 2397778 and WO2008 / 130306 more specifically disclose installations of the type shown diagrammatically in the appended FIG. 1 according to which the hot water tank 10 in which the domestic hot water is taken is itself placed in a heating body. associated with the heat pump 30. The heat pump conventionally comprises an evaporator 32, a compressor 34, a condenser 36 and a pressure reducer 38. The heating element 20 is also associated with the heating circuit 40. These installations in which the domestic hot water tank 10 is placed in a heating body 20 do not optimize the heating of the water in the aforementioned balloon 10.

It will also be observed that EP 2397778 is essentially concerned with trying to optimize the coupling of the heat pump with an auxiliary source. The backup source is put into operation when the temperature of the water in the heating body reaches the maximum temperature produced by the heat pump and that the set temperature of the heating circuit is still not reached. It will also be noted that EP 2397778 recommends splitting the heating element into a lower compartment and an upper compartment housing the hot water tank 10, by a substantially horizontal partition wall provided with a central orifice.

The document WO2008 / 130306 is essentially concerned with ensuring the coupling between two heat sources, including a solar collector, designed to charge the evaporator of the heat pump.

The installation disclosed in JP 2011141076 seems limited to heating a bathtub. It is shown schematically in FIG.

According to this document a recharge loop 50 connected to the heat pump 30 directly supplies the internal volume of the domestic hot water tank and a thermal coupling 60 with the domestic hot water contained in the tank 10 supplies the heating circuit 40.

The purpose expressed in this document is to reduce the amount of hot water at medium temperature (50 to 40 ° C) in the middle of the flask 10 which is generated when there is a need for heating and which increases day by day.

To this end, document JP 201141076 proposes that when the night fare is detected and if the temperature at the top of the flask is not high enough, the water heated by the heat pump to more than 80 ° C is injected in the middle of the tank. ball. Thus the water in the middle of the flask resulting from the mixing of the water at more than 80 ° C from the PAC and the water at 50 ° C, reaches an average temperature of 70 ° C. Then, once this temperature of 70 ° C reached, is injected at the top of the flask hot water at 80 ° C from the PAC. Thus, at the end of the day, the amount of water at medium temperature (40 ° C) is decreased while that at low temperature (15 ° C) is increased. This operation causes the bathtub heating system to disturb the stratification of the water stored in the flask. Other known systems are described in documents FR 1430376, WO 2004/070279 and FR 2402841.

The objective of the present invention is to propose a new installation which makes it possible to ensure priority heating of domestic hot water while optimizing an auxiliary heating circuit according to the thermal resources available and in an inexpensive configuration, simple and reliable.

This objective is achieved in the context of the present invention through a sanitary water heater installation comprising a domestic hot water tank, a heat source, a charging loop associating the heat source and the hot water tank and a heating loop connected to the hot water tank for heating an auxiliary heating circuit, characterized in that the charging loop and the heating loop communicate directly with the internal volume of the hot water tank and that there are direct connections between the charging loop and the heating loop, selectively switched on when the measured temperature of the domestic hot water permits, and characterized in that the connection means of the charging loop and the heating loop comprise two three-way valves, one for selectively connecting the output of the charging loop either with the balloon or with the input of the heating loop and the other for selectively connecting the output of the heating loop either with the balloon or with the input of the charging loop.

As will be discussed in more detail below, the direct selective linking of the charging loop and the heating loop optimizes the performance of the system without disturbing the temperature and stratification of the domestic hot water. although it can flow directly into the charging loop and into the heating loop.

The combination according to the present invention marks in this a break with respect to the state of the art although leading to a technically simple structure. Preferably, the heat source is a heat pump. Advantageously, the heat pump is reversible to allow operation in air conditioning through the direct connection between the charging loop and the heating loop. This direct connection makes it possible not to disturb the temperature and stratification in the hot water tank. Thus we obtain a versatile system allowing including heating from domestic hot water.

According to other optional and advantageous features of the present invention:

. the installation comprises a mixer that ensures a mixture between hot water taken from the upper part of the flask and water at a lower temperature, preferably the return of the heating loop.

. the installation comprises an additional heating circuit connected by two branch connections with the internal volume of the hot water tank in parallel with the heating loop.

. the return of the water of the additional heating circuit is made by a tapping at the bottom of the balloon located above or at the same level of the stitching point of the heating loop, while the departure of the water from the additional circuit heating is done by a stitching at the top of the balloon located below or at the same level of the stitching point of the heating loop.

. the additional heating loop is controlled by a variable speed circulation pump and / or a controlled mixing valve. . the set of pipes that opens in the form of a return to the internal volume of the balloon includes jet bursts.

. the commissioning of the heating loop is controlled by a temperature probe placed on the balloon at a level less than or equal to the supply point of the heating loop.

. two temperature probes control the operation of the charging loop: a probe installed on the tank to detect the hot water level and which controls the start of the charging loop and a probe installed either at the bottom of the balloon or on the cold water pipe of the charging loop which controls the stop of the charging loop and the heat pump when the balloon is loaded with hot water.

. domestic hot water circulates in the charging loop and in the heating loop.

. the evaporator of the heat pump is fed by a flow of air. . the installation comprises at least one register adapted to direct selectively towards the evaporator of the heat pump, a flow of air coming from the inside of a building, for example resulting from the ventilation of a building, or a airflow from the outside.

. the installation comprises at least one register adapted to direct selectively towards the outside or towards the inside of a building, the air flow which has swept the evaporator of the heat pump.

. the charging loop and the heating loop each include a circulation pump

. the charging loop includes a check valve and a solenoid valve.

. the heating loop includes a trap.

. the heating circuit is an air circuit.

Other features, objects and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings, given as non-limiting examples and in which:

FIGS. 1 and 2 previously described represent exemplary embodiments according to the state of the art,

FIG. 3 represents a first embodiment of a sanitary water heater installation according to the present invention, and

- Figures 4 and 5 show two alternative embodiments of the sanitary water heater installation according to the present invention.

We will first describe an embodiment of the sanitary water heater installation according to the present invention illustrated in Figure 3 attached. An installation which includes a hot water tank 100, a thermodynamic source 300 preferably formed of a heat pump (PAC), a refill loop 130 for heating the domestic hot water, is found in appended FIG. contained in the balloon 100 and a heating loop 140 for supplying an auxiliary heating circuit 400.

Subsequently, the description will be made with respect to an installation comprising, as a thermodynamic source, a heat pump, in order to simplify the description.

However, the invention can be applied to any other equivalent thermal resource.

The hot water tank 100 may in itself be the subject of many embodiments known to those skilled in the art. It will not be described in detail later.

Essentially, the hot water tank 100 includes a tank

110 thermally insulated which has an inlet 112 located in the lower part of the balloon connected to a water inlet and an outlet 114 located in the upper part of the balloon connected to the hot water sampling point.

Preferably, the inlet 112 and the outlet 114 are each provided with a jet jet system 113, 115 intended to avoid disturbing the thermal stratification of the hot water within the balloon 100.

A safety group 102 is preferably installed on the inlet of cold water 112.

The thermodynamic source 300, when it consists of a heat pump as illustrated in Figures 3, 4 and 5 appended, may be formed of any known structure of a heat pump operating a refrigerant and composed of an evaporator 320, a compressor 340, a condenser 360 and a pressure reducer 380. The evaporator 320 is advantageously an air evaporator, that is to say that it is powered by a flow of air 322 preferably moved by a fan 324. The fan 324 may be provided upstream of the evaporator 320 as shown in Figure 3 or alternatively downstream thereof. The air moved by the fan 324 on the evaporator 320 may be air taken outside or inside a building or the air from the building ventilation whether mechanical controlled or natural. In FIGS. 3, 4 and 5 appended, there is referenced 323 a register adapted to direct selectively towards the evaporator 320 of the heat pump 300, a flow of air coming from the inside or the outside of a In the evaporator, the air flow 322 transfers calories to the refrigerant circulating in the closed circuit consisting of the evaporator 320, the compressor 340, the condenser 360 and the expander 380. Similarly in FIGS. 4 and 5, diagrammatically shown a register 325 adapted to selectively direct outward or inward of a building, the air flow that has swept the evaporator 320 of the heat pump 300.

The compressor 340 raises the pressure and temperature of the gaseous refrigerant by compressing it.

The condenser 360 is preferably a double-walled water condenser, that is to say that the refrigerant circulating in the closed circuit of the heat pump 300 is in heat exchange with a flow of water flowing in. the charging loop 130, but that there is no risk of contamination of the domestic hot water by the heat pump 300 through the double wall structure of the condenser 360. As will be seen later, this flow of water comes directly from the volume of domestic hot water present in the tank 110 of the balloon 100.

The refrigerant transfers the calories drawn into the air at the evaporator 320 to the water flow at the condenser 360.

The hot water produced in the condenser 360 is stored in the balloon 100 through the charging loop 130.

Especially in summer, the evaporator 320 can be supplied not by outside air, but by air taken from inside a building to cool it by taking the calories from the pulsed air. so inside the building. This makes it possible to cool a building "free of charge" by producing domestic hot water. The control of the heat pump 300 is advantageously correlated with the charging loop 130 to ensure a thermal power at the condenser 360 sufficient to heat the flow of water at an elevated temperature, for example at 55 ° C. The air flow 322 at the evaporator 320 is thus controlled proportionally to the power demanded.

The charging loop 130 is used to fill the balloon 100 with domestic hot water heated at the condenser 360. The charging loop 130 comprises a conduit 132 which draws cold water from the bottom of the balloon 100 or directly from the network. sanitary water through a pump 134 which directs the water thus withdrawn to the water exchanger condenser 360. The pump 134 must be adapted to the sanitary requirements of the sanitary water. The water leaving the exchanger of the condenser 360 is injected at the top of the tank 100 via a non-return valve 136 and a solenoid valve 137.

Specifically, the conduit 132 thus opens in the upper part of the balloon via a three-way valve 510 whose function will be described in more detail later.

An alternative may be to place the 3-way valve 510 at the intersection between the ducts 520 and 140 which will be described later.

According to the particular embodiment shown in FIG. 3, the charging loop 130 opens at the outlet of the three-way valve 510, via a line 512, in the high point of stitching 114. As a variant, the charging circuit 130 could lead to directly into the balloon 100 via the line 512 and independently of the outlet stitching point 114.

The non-return valve 136 installed on the charging loop 130 near the high tapping point 114 prevents any flow in the opposite direction of the hot water, in particular by thermosiphon. It also serves to prevent the defusing of the pump 134. The check valve 136 can be installed on the pipe 130 between the 3-way valve 510 and the pump 134. The solenoid valve 137 prevents a residual flow in the pipe 130 when there are high-flow DHW withdrawals and the heat pump 300 is stopped. Solenoid valve 137 may be installed anywhere along line 130.

Similarly, according to the embodiment shown in the accompanying figures, the inlet of the charging loop 130 opens on the water inlet 112. In this configuration, the connection point between the charging loop 130 and the point input 112 in the balloon is operated downstream of the aforementioned security group 102. However, here again, a stitching point separate from the cold water inlet point 112 in the balloon 100 can be used at the balloon 100 for the start of the refill loop 130.

Those skilled in the art will understand from reading the foregoing description that according to the invention the charging loop 130 communicates directly with the internal volume of the domestic hot water tank 100 and as a result of the domestic hot water circulates in the duct 132 of the charging loop 130.

The purpose of the heating loop 140 is to heat a fluid, preferably an air stream used in the auxiliary heating circuit 400, by the domestic hot water of the tank 100. Preferably, the air stream 400 is driven by a fan or equivalent 410. The latter may be provided upstream or downstream of the exchanger 420 ensuring the exchange of heat between the air flow 400 of the auxiliary heating circuit and the hot water flow circulating in the heating loop 140.

The heating loop 140 comprises a conduit 142 having a stitching point 141 in the upper part of the balloon 100 for supplying the heating loop 140 with domestic hot water at approximately 55.degree.

The heating loop 140 comprises a pump 144 adapted to the sanitary constraints of the domestic water, which circulates the domestic hot water in the heating loop 140 and through water / air exchanger 420. This pump 144 may be provided upstream or downstream of the exchanger 420 on the heating loop 140.

As indicated above, the air is pushed by the fan 410 to cross the exchanger 420 and then discharged into the inhabited space of the housing to heat it.

The return of cooled water leaving the heating loop 140 at about 25 ° C is done by a stitching point 148 in the lower part of the balloon 100.

A jet breeze 149 is integrated on the return output 148 of the heating loop 140.

A trap 146 is installed on the heating loop 140 between the pump 144 and the exchanger 420.

Depending on the need for heating the housing, the circulation pump 144 and the fan 410 are controlled to deliver the necessary power.

A temperature probe 143 placed on the balloon 100 at a level less than or equal to the stitching point 141 for supplying the heating loop 140 gives information on the quantity of hot water still available in the balloon 100. depending on this value, the heating loop 140 can be turned on or off.

Two temperature probes can be used to control the operation of the charging loop 130. A first probe 133 detects the hot water level and controls the start of the charging loop 130, that is to say the setting service of the heat pump 300 and the pump 134. The second probe 135 is installed either in the lower part of the tank 100 or on the cold water pipe 132 upstream of the exchanger 360. It controls the shutdown of the recharge loop 130, that is to say the heat pump 300 and the pump 134, when the balloon 100 is loaded with hot water.

Those skilled in the art will understand from reading the foregoing description that the charging loop 130 and the heating loop 140 which each communicate directly with the internal volume of the balloon Domestic hot water 100 are run directly by domestic hot water.

As indicated above, it is further provided according to the invention, direct selective links between the charging loop 130 and the heating loop 140. More specifically, there is provided a selective connection 500 between the output of the recharge loop 130, ie the high point of the charging loop 130, and the input of the heating loop 140 and a selective link 600 between the output of the heating loop 140 is i.e., the low point of the heating loop 140, and the input of the charging loop 130.

The two links 500 and 600 are put into operation, when the measured temperature of the domestic hot water inside the balloon 100 allows it.

According to the embodiment shown in the accompanying figures, the link 500 is formed of the aforementioned three-way valve 510 associated with a conduit 520. The three-way valve 510 controlled by a temperature setpoint receives the output of the charging loop as input 130 from the non-return valve 136. According to its state, the three-way valve 510 communicates the output of the charging loop 130, either directly with the internal volume 100 via the pipe 512, where appropriate via the high stitching point 114 or a separate subchanging point, with the heating loop 140 via conduit 520.

In a symmetrical manner, the connecting means 600 comprises a three-way valve 610 associated with a duct section 620. The three-way valve 610 receives on its input the output of the heating loop 140 coming from the exchanger 420, via the duct 142.

According to its state, the three-way valve 610 communicates the output of the heating loop 140 either with the stitching point 148 in the balloon 100, or with the inlet of the charging loop 130, via the conduit 620.

Thus the heating loop 140 is not only connected to the balloon 100, it is also connected directly to the heat pump 300 via conduits 520, 620 and associated three-way valves 510, 610. The water heated by the heat pump 300 at the charging loop 130 can therefore be injected at the top of the tank 100 or sent to the heating loop 140. The three-way valve 510 is used for this purpose. effect. At the outlet of the exchanger 420 of the heating loop 140, the domestic hot water may be returned to the bottom of the tank at the point of tapping 148, or sent directly to the heat pump 300 according to the position that takes the second three-way valve 610.

The foregoing provisions make it possible to provide heating in the loop 140 at a lower temperature than the domestic hot water present in the balloon 100, for example 45 ° C.

As already indicated above, according to an advantageous characteristic of the present invention, the heat pump 300 is reversible in order to allow operation in air conditioning thanks to a direct connection between the charging loop 130 and the heating loop 140. The installation according to the present invention then leads to a multipurpose system allowing including heating from domestic hot water and air conditioning. It is thus conceivable to operate the installation in air conditioning mode during the daytime periods and by inverting the heat pump 300 in the charging mode of the balloon 100 during the nocturnal periods.

The operation of a heat pump in reversible mode is well known to those skilled in the art. It will not be described in detail later. A reversible heat pump is able to reverse the direction of circulation of the refrigerant and consequently, not to draw the heat contained in the outside air to transfer it inside the balloon 100, but on the contrary to tap the heat within the dwelling via the circuit 400 and the loop 140 and transfer and reject it to the outside through the loop 130 and the stream 322. In air-conditioning mode, the loops 140 and 130 are put into direct connection by the three-way valves 510, 610. The water cooled by the heat pump 300 is sent directly to the exchanger 420 via the valve 510, without passing by the balloon 100, then returns to the charging loop 130 directly via the valve 610, still without passing through the balloon 100. This arrangement makes it possible to operate the installation in cooling mode by providing the necessary cold in the house without breaking the thermal stratification of domestic hot water in the balloon 100.

FIG. 4 appended hereto shows an alternative embodiment comprising a thermostatic mixing valve 700 which receives at the inlet, on the one hand, hot water coming from the upper stitching point 114 via the pipe 118 and on the other hand cold water taken from the bottom of the balloon, for example as shown in Figure 4 at the return 148 formed at the output of the heating loop 140, via the pipe 704. The water can also come directly from the heating loop 140 via the three-way valve 610. The thermostatic mixer 700 provides on its output 702 sanitary hot water at a controlled temperature.

For example, by mixing water at 25 ° C taken from the bottom of the flask 100 and the hot water at 55 ° C taken from the upper part of the flask 100, hot water can be supplied. at a controlled temperature between 40 and 50 ° C.

The major advantage of this option is the use of the return of the heater 140 in addition to the hot water of the balloon.

Thus, it reduces the flow of domestic hot water to 55 ° C and increases the autonomy of the ball.

A heating loop 140 has previously been described, supplying an auxiliary heating circuit 400 of the air type.

Alternatively, the heating loop 140 may be designed to supply via the exchanger 420 a heating system 400 of the water type. FIG. 5 also shows an alternative embodiment for supplying heating to an additional module, for example the heating supply of a radiator or a heated floor, or even of any other means. equivalent. This variant comprises in parallel with the heating loop 140 on the air vector, an additional loop 800 comprising additional taps 805, 810 on the domestic hot water tank 100 for supplying via a circulation pump 820 the primary of an exchanger 830 with single wall plate. The secondary of this heat exchanger 830 is connected to a technical water heating loop, radiators and / or underfloor heating. This heating loop is itself equipped with a circulation pump supplying the emitters formed by the radiators and heated floors.

The circulation pump 820 and the circulation pump associated with the secondary can be installed upstream or downstream of the exchanger 830.

It will be noted that the return of the water of the primary circuit at the stitch 810 is done by a stitching at the bottom of the balloon located above the stitching point of the heating return 148 on the air vector, or at the same level as stitching point 148, or even at the same stitching point 148 of the heating loop 140. A jet breeze 811 is also integrated on the heating return 810.

The input 805 of the loop 800 is in turn preferably located below the stitching point 141 forming the inlet of the heating loop 140, or at the same level as this stitching point 141, or even failing in the same stitching point 141 of the heating loop 140.

In the case of radiators and underfloor heating systems, the change in return water temperature of the primary circuit in domestic hot water as needed, may break the thermal stratification of the tank. The use of a mixing valve on the same hydraulic circuit makes it possible to regulate the flow temperature of water and thus to better control also the return water temperature. In the case of underfloor heating, a variable speed circulation pump can replace or be added to the mixing valve.

Depending on the need for heating the housing, circulation pumps such as 820 are controlled to deliver the necessary power. A temperature probe placed on the flask at a level less than or equal to the supply tap point gives information on the amount of hot water still available in the flask. Depending on this value the heating loop 800 can be turned on or off. The temperature probe in question may be the aforementioned temperature probe 133.

The heating circuit 800 with radiators or a heated floor, or any equivalent means, can be the subject of many embodiments known to those skilled in the art. It will not be described in detail later.

New or renovated buildings are increasingly isolated, so that the distribution of consumption per dwelling is greatly modified.

On the other hand, in this type of housing problems of overheating appear in mid-season and in summer. Indeed, too much inertia of the transmitters (on the water vector for example), does not make it possible to face the rapid variations of internal temperatures in mid-season, and in summer the overheating appear because of an effect

"Thermos" well insulated homes.

Thus, air conditioning needs are becoming more prevalent today and may in certain regions exceed the heating needs if the bio-climatic orientation of housing has not been sufficiently exploited.

For example in a single house type RT2012 in zone

H2, whose technological package corresponds to a technico-economic optimum, the average distribution of needs is 18kWhep / m ² per year for heating, and about the same for air conditioning and hot water. Faced with these new profiles of need, the products proposed by the industrialists did not make it possible so far to satisfy all the requirements of the user to know the cost of investment, the comfort of environment (of winter, of summer and / or half-season) comfort on domestic hot water or the energy bill (through the annual energy performance) to name only the main ones.

Added to these increasing difficulties in satisfying the users of well insulated buildings, the invention makes it possible to take into account the problem of the load curve of the electricity network which makes it more and more difficult for the suppliers of electricity to cover electricity needs during peak hours in winter. Thus, it also becomes essential to promote solutions allowing erasure.

The present invention offers a solution to the whole of the problem thus posed.

The present invention indeed offers many advantages over the existing state of the art.

In the first place, it should be noted that the present invention makes it possible, with the aid of a single installation, to fulfill all the required functions of permanent provision of domestic hot water, heating, cooling, air conditioning and erasure. The invention thus offers an undeniable advantage on the economic level.

In particular, it allows a reduction in investment costs through the use of a single heat pump, a single flask and a single water system that uses only sanitary water, without any technical water to cover all needs.

In addition to reducing costs and simplifying hydraulic circuits, using domestic hot water for heating also has the advantage of using a permanent heating storage solution.

Indeed, demand for electricity peaks at certain hours of the morning or evening, which increases the pressure on the network load. A significant part of this increase in consumption is related to heating. It therefore seems appropriate to seek to erase the best heating by de-phasing its production demand, which is to increase its storage capacity.

The solutions relating to the inertia of emitters such as heated floors do not seem completely satisfactory because the return of heat over time is not perfectly controlled. Using energy storage in the domestic hot water tank as recommended in the context of the present invention is more appropriate.

The present invention also makes it possible to avoid a storage tank dedicated solely to heating, which generates an additional cost and associated static losses which degrade the performance of the system.

Using a common balloon for the supply of domestic hot water and for heating, the present invention also makes it possible to benefit from the fact that in a balloon the more energy is withdrawn, the lower the average temperature of the water, which amounts to reducing the amount of energy lost through the static losses of the balloon.

Not only does the invention take advantage of this effect by multiplying the applications of the domestic hot water tank 100 and thus increasing the energy withdrawn into the tank, but also integrating the "free" cooling function, the invention allows that this ratio of static loss per kW / h of energy produced is even more diminished.

Thus, the present invention offers a particularly suitable solution for well insulated buildings where the heating requirements are low because it allows to limit the storage space and associated static losses, while maintaining a good stratification of domestic hot water in the balloon 100.

Those skilled in the art will understand that the solution given in the context of the invention, although it exploits a direct circulation of domestic hot water in the charging loops 130 and heating 140, allows, thanks in particular to the direct selective links allowed between these loops, to maintain the stratification of domestic hot water in the balloon 100 which is a key point.

The invention makes it possible in particular to guarantee the thermal stratification of the domestic hot water inside the balloon 100, thanks to the following provisions:

. positioning the return point 148 of the heating loop 140 having a large temperature delta at the bottom of the balloon 100, while for heating systems with a low temperature delta such as towel warmers, heated floors, etc. ... the return point 810 is placed in the lower part of the balloon but at a stitching point 810 located above the point 148 of the high temperature delta system,

. by placing jet burs 113, 149, 115 and 811 at the outlet of all the ducts which open in the form of a return towards the interior of the tank 100

. by using a circulator speed adapted to the power of the heat pump as well as an internal monobloc integration which limits the losses in line (making it possible to ensure a temperature of 55 ° C at the output of the heat pump permanently),

. using an external exchanger 360 (indeed the external exchangers provide better stratification than the submerged coils since the heat is introduced only from the top of the balloon).

Note that the exchanger 360 associated with the charging loop

130 is preferably a double wall exchanger.

Putting the plant into operation by supplying the evaporator 320 not with the outside air but with the indoor air of a building makes it possible to benefit from a free cooling while producing domestic hot water. It suffices for this to provide appropriate registers for selectively directing the flow of air at the inlet and outlet of the evaporator 320. The embodiment shown in Figure 5 is particularly suitable for heating a towel dryer with the heat exchanger 830. This solution has the advantage of avoiding blowing hot air in wet rooms such as rooms baths and kitchens and thus avoid disturbing the ventilation that must circulate in a general and permanent way of living rooms to wet rooms.

To increase the performance of the heat pump 300 in heating mode and / or domestic hot water production, it is possible to associate the evaporator 320 with controlled single-flow mechanical ventilation and thus recover its free calories.

The pumps 134, 144 and 820 in which domestic hot water circulates must comply with the characteristics that make them compatible with domestic hot water, that is to say essentially not to pollute water in any way. domestic hot water circulating through said pumps. A non-limiting example of such a pump is the Wilo Stratos ECO-Z-25 / 1-5 BMS pump.

Of course, the present invention is not limited to the particular embodiments which have just been described but extends to any variant within its spirit.

Claims

1. Sanitary water heater installation comprising a hot water tank (100), a heat source (300), a charging loop (130) associating the heat source (300) and the hot water tank (100). ) and a heating loop (140) connected to the hot water tank (100) for heating an auxiliary heating circuit, characterized in that the charging loop (130) and the heating loop (140) communicate directly with the internal volume of the domestic hot water tank (100) and that direct connections (500, 600) are provided between the charging loop (130) and the heating loop (140), selectively connected to service when the measured temperature of the domestic hot water permits, and characterized in that the connection means (500, 600) of the charging loop (130) and the heating loop (140) comprise two valves three channels (510, 610), one for selectively connecting the output of the charging loop (130 ) with the balloon (100) or with the inlet of the heating loop (140) and the other for selectively connecting the output of the heating loop (140) with the balloon (100) or with the input of the charging loop (130).

2. Installation according to claim 1, characterized in that the heat source (300) is a heat pump.

3. Installation according to claim 2, characterized in that the heat pump (300) is reversible to allow operation in air conditioning through the direct links between the charging loop (130) and the heating loop (140).

4. Installation according to one of claims 1 to 3, characterized in that it comprises a mixer (700) which provides a mixture between hot water taken from the upper part of the balloon (100) and water to a lower temperature, preferably the return of the heating loop (140).

5. Installation according to one of claims 1 to 4, characterized in that it comprises an additional heating circuit (800) connected by two taps (805, 810) with the internal volume of the hot water tank (100) in parallel with the heating loop (140).

6. Installation according to claim 5, characterized in that the return (810) of the water of the additional heating circuit (800) is made by a stitching in the lower part of the balloon (100) located above or at the same level of the stitching point (148) of the heating loop (140), while the starting (805) of the water of the additional heating circuit (800) is made by a stitching at the top of the balloon (100) located in below or at the same level of the stitching point (141) of the heating loop (140).

7. Installation according to one of claims 5 or 6, characterized in that the additional heating loop (800) is controlled by a variable speed circulation pump and / or a controlled mixing valve.

8. Installation according to one of claims 1 to 7, characterized in that all of the pipes which opens in the form of a return in the internal volume of the balloon (100) comprise jet breezes (113, 115, 149, 811).

9. Installation according to one of claims 1 to 8, characterized in that the commissioning of the heating loop (140) is controlled by a temperature sensor (143) placed on the balloon at a level less than or equal to supply stitching point of the heating loop (140).

10. Installation according to one of claims 1 to 9, characterized in that two temperature sensors control the operation of the charging loop (130): a probe installed on the balloon (100) to detect the level of hot water and which controls the start of the charging loop (130) and a probe (135) installed either at the bottom of the balloon (100) or on the cold water line (132) of the charging loop (130) which controls stopping the charging loop (130) and the heat pump (300) when the balloon (100) is loaded with hot water.

11. Installation according to one of claims 1 to 10, characterized in that the domestic hot water circulates in the charging loop (130) and in the heating loop (140).

12. Installation according to one of claims 1 to 11, taken in combination with claim 2, characterized in that the evaporator (320) of the heat pump (300) is supplied by a stream of air.

13. Installation according to one of claims 1 to 12, taken in combination with claim 2, characterized in that it comprises at least one damper adapted to selectively direct towards the evaporator (320) of the heat pump (300 ), a flow of air from the ventilation of a building.

14. Installation according to one of claims 1 to 13, characterized in that the charging loop (130) and the heating loop (140) each comprise a circulation pump (134, 144).

15. Installation according to one of claims 1 to 14, characterized in that the charging loop (130) comprises a non-return valve (136) and a solenoid valve (137).

16. Installation according to one of claims 1 to 15, characterized in that the heating loop comprises a trap (146).

17. Installation according to one of claims 1 to 16, characterized in that the heating circuit (400) is an air circuit.