EP1228333A1

EP1228333A1 - Modular mixed gas wall boiler

Info

Publication number: EP1228333A1
Application number: EP00977643A
Authority: EP
Inventors: Mohammed Benabdelkarim; Alain Breton
Original assignee: Saunier Duval Eau Chaude Chauffage SDECC SA
Current assignee: Saunier Duval Eau Chaude Chauffage SDECC SA
Priority date: 1999-11-09
Filing date: 2000-11-09
Publication date: 2002-08-07
Anticipated expiration: 2020-11-09
Also published as: WO2001035028A1; PT1228333E; FR2800857B1; TR200401278T4; FR2800857A1; ES2219416T3; DE60008780T2; DE60008780D1; ATE261091T1; EP1228333B1

Abstract

The invention concerns a boiler whereof the primary generator, with the primary exchanger (13), the gas burner (10) and its gas intake mechanism (11), with the combustion chamber and its primary exchanger (13), as well as with the system (14) evacuating the combustion products and the water circulating pump (16), forms a first module (1) which is separable and/or separate from a second module (2) for producing sanitary hot water essentially comprising a secondary exchanger (20), and optionally a third module (3) for producing sanitary hot water essentially comprising a tertiary exchanger (30), the secondary and tertiary exchangers being connected by short circuits (21, 31) to the heating circuit (15, 18). The invention is applicable to modular mixed boilers.

Description

MODULAR MIXED GAS WALL BOILER

The invention relates to wall-mounted mixed gas boilers, that is to say to boilers capable of supplying a primary heating circuit, but also a secondary generator of domestic hot water and it relates more precisely to a boiler whose generators primary and secondary are separate or separable. A wall-mounted mixed gas boiler is made up, as we know, of a primary heat generator for heating essentially comprising a gas burner and its associated gas intake mechanisms, a combustion chamber closed by a primary exchanger, a system of evacuation of combustion products, and a water circulation pump. The exhaust system is a draft hood in the case of an atmospheric boiler or a smoke extractor in the case of a sealed boiler.

The mixed boiler also includes a secondary generator for the production of domestic hot water, consisting of a secondary exchanger, for example a plate exchanger. In the circuit of this secondary generator are provided a three-way valve, a flow sensor for domestic water draw-off, possibly a tank for the irάcro-accumulation of domestic hot water and appropriate temperature and flow sensors. All these components are brought together in a single device, as compact and light as possible so that it can be fixed to the wall and integrated into a room, generally a kitchen or a garage. Having a single device to perform all of these functions may have some drawbacks in some installations.

Thus, if the appliance is to be installed in a kitchen, it can sometimes be too bulky to fit in or next to one of the cupboards. As far as possible, it is therefore preferable to move the boiler away from the living rooms, if only to avoid, on the one hand, the nuisance caused by noise, in particular during the ignition of the burner and the operation of the circulation pump and on the other hand all the risks linked to the circulation of gases and combustion products in a closed enclosure which some people consider as potentially dangerous and seek to avoid. But a boiler installed for example in a garage or a laundry room is often far from the draw points (kitchen, bathroom ...), which generates a waiting time to obtain hot water, and consumption increased water and energy. The invention therefore makes it possible to get rid of the circulation loops of sanitary hot water which are expensive to install and are sources of losses in electrical and thermal energy, and while offering the same service as conventional wall-mounted boilers, without time waiting at the various draw-off points.

The invention is based on the principle of the possible and modular separation of the primary and secondary generators according to the technique known as "split System". This technique essentially consists in producing at least two units for each of these two generators, these units being juxtaposed, separable and / or separate.

A main object of the present invention therefore consists of a wall-mounted mixed gas boiler comprising a primary heat generator for heating with a gas burner, a combustion chamber closed by a primary exchanger, a system for evacuating combustion products. and a water circulation pump in the heating circuit of the appliance, and also comprising a secondary generator for the production of domestic hot water, consisting of a secondary exchanger with a three-way valve provided in the circuit of said generator boiler according to which the primary generator, with the primary exchanger, the gas burner and its associated mechanisms, as well as the circulation pump, forms a first module which is separable and / or separated from at least a second module containing a generator secondary for domestic hot water production, which includes essentially a secondary exchanger installed on a short circuit connected to the heating circuit of the primary generator.

According to another advantageous characteristic of the invention, the primary generator is associated with two domestic hot water generators, namely a secondary generator with a secondary exchanger, and a tertiary generator with a tertiary exchanger, the two generators forming two modules mutually separated from each other, the short circuit of the tertiary generator being connected on one side to the heating circuit of the primary generator, and on the other to the short circuit of the secondary generator.

Other particular characteristics and advantages of the invention will emerge from the description which follows of embodiments in which reference is made to the appended drawings which represent:

Figure 1, a schematic view of the assembly of a mixed boiler with a secondary module for domestic hot water. Figure 2, a general view of a kitchen incorporating at two separate points the primary generator and the secondary generator.

Figure 3, a general view of an alternative installation in which the primary generator is outside the kitchen and in which the secondary generator serves several draw points.

Figure 4, a schematic view of the assembly of a mixed boiler with a secondary module and a tertiary module, domestic hot water generators. Figure 5, a general view similar to the figure

3, also showing a tertiary module outside the kitchen.

Figure 6, a general view of an alternative installation in technical sheath on housing bearings.

There is shown in Figure 1 a mixed boiler dice "simple split" consisting of a first module primary heat generator generally designated by the reference 1 and a second secondary generator of domestic hot water generally designated by the reference 2. The primary generator 1 essentially comprises a gas burner 10 and its mechanism 11 d gas inlet, a combustion chamber 12 closed by a primary exchanger 13, and a hood 14 for evacuating combustion products. In the hot water return pipe 15 in which the water admitted to the exchanger circulates, there is a circulation pump 16 and on the hot water outlet side through the pipe 18 in the direction of the arrow is placed a temperature sensor 17, the conduits (15, 18) forming the heating circuit of the primary generator. In the secondary generator 2, a secondary exchanger 20 is installed on a short circuit 21 connected on one side to the hot water return circuit 15 and on the other side to the conduit 18 for hot water departure via a three-way valve 22 which distributes the hot water also to the heating start circuit 27. Sanitary cold water is admitted to the exchanger 20 by a conduit 23 equipped with a flow sensor 24 and sanitary hot water leaves the exchanger to the drawing point by a conduit 25 equipped with a temperature sensor 26.

When the device is operating in heating, the three-way valve 22 directs the hot water to the circuit 27. When the heating request stops, it is repositioned on the short circuit 21 with sanitary priority. When the sensor 24 detects a drawing, the ignition of the burner 10 intervenes to ensure the heating of the water by the exchanger 13 and its rapid circulation in the short circuit 21 for the heating of the domestic water in the secondary exchanger 20. The temperature is regulated by the sensor 26.

The wall-mounted boiler thus consists of the primary 1 and secondary 2 generators which are separable and can be installed in two geographically different places or premises, of the dwelling. Thus, as illustrated in FIG. 2, the primary generator 1 can be integrated into the tall elements 19 of a standard kitchen unit. Against by the secondary generator 2 is placed in the lower part, for example under the sink 28 of the kitchen, so as not to disturb the aesthetics of the integrated kitchen.

When a boiler is installed in a garage, it is often far from the tapping points located in the kitchen and bathrooms. By installing the primary generator 1, for example in a garage as shown in Figure 3, and the secondary generator 2 under the kitchen sink 28, as in the previous case, the water arrival time is considerably reduced hot at the sink draw-off point as well as at a neighboring draw-off point such as a shower 29, and substantial savings in water and energy are thus achieved. This also avoids the noise of the device, mainly caused by the primary generator 1, being emitted in the home. You can also install the primary generator outside the home, for example on a balcony or in a laundry room and the secondary generator is located inside and is protected from frost. The only precaution to take for the primary generator is to add an antifreeze product in the heating circuit.

Another alternative embodiment consists in using several secondary generators for producing domestic hot water, associated with a single primary generator. Figure 4 schematically illustrates the mounting of a boiler of this type called "multi-split".

We see the two modules 1 and 2 in which the same elements have the same references. Another tertiary generator designated as a whole by the reference 3 is independent of the generator 2. It comprises a tertiary sanitary exchanger 30 installed on a short circuit 31 connected on one side to the water return circuit 15 of the primary generator 1, and on the other hand to the short circuit 21 of the secondary generator 2 by means of another three-way valve 32 which is located on the short circuit 21, in series with the valve 22. The three-way valve 32 is therefore between the latter and the secondary exchanger 20. It is designed to be able to occupy an intermediate position which makes it possible to supply both the short circuit 31 and the exchanger 20. Advantageously a stepping motor 41 is provided for the operation of the three-way valve 32. Domestic cold water is admitted to the exchanger 30 by a conduit 33 fitted with a flow sensor 34 and the domestic hot water leaves the exchanger by a conduit 35 towards a microaccumulation tank 37 equipped with a temperature sensor 36. The tank 37 is kept at temperature by an electrical resistance 38 to compensate for the heat losses, in connection with a bimetallic switch 39.

When a drawing is made using the single tertiary generator 3, the three-way valve 22 opens towards the short circuit 21, on the other hand the three-way valve 32 closes towards the secondary exchanger 20 but opens towards the short circuit 31 so that the heating water emitted by the exchanger 13 directly heats the tertiary generator 3. The temperature is regulated by the sensor 17 placed on the primary circuit. The production of hot water by the tertiary sanitary exchanger 3 takes place at a fixed temperature setpoint, for example 55 ° C. To lower this temperature to the value that the user desires for his comfort in showering or bathing, for example 40 ° C, a thermostatic valve 40 at the outlet of the tank 37 mixes the hot water produced at 55 ° C, with the cold network water. The microaccumulation reservoir 37, placed in series between the outlet of the exchanger 30 and the inlet of hot water into the thermostatic valve 40 makes it possible to immediately supply hot water to the draw-off point and thus compensate for the time of temperature rise of the primary exchanger and 1 tertiary exchanger located at a certain distance from each other. The bimetal switch 39 linked to the reservoir 37 and adjusted for example to 55 ° C, cuts the electrical supply when the temperature detected by the sensor 17 reaches 55 ° C, and restores it when it drops to 50 ° C for example . It is noted that this tertiary generator 3 operates without electrical connection with the primary generator 1, which avoids the tedious installation of an electrical line between these two modules located at a certain distance from each other.

It is also possible to provide simultaneous drawing of the secondary generator 2 and the tertiary generator 3. In this case, in any case, the valve 22 is open in the direction of the short circuit 21. For its part, the three-way valve 32 will place in the middle position for which the heating water is distributed both to the short circuit 31 of the tertiary exchanger 30 and to the secondary exchanger 20. A stepping motor 41 for the operation of this three-way valve 32 , allows fine adjustment of the water flow in the two sanitary exchangers in order to adjust the temperatures to the appropriate setpoints, according to sensors 17 and 26.

FIG. 5 is an illustration of a “multi-split” type installation with two sanitary generators. In the case presented, similar to the assembly of FIG. 3, the primary generator 1 is located in a garage and the secondary generator 2 under the sink 28 of the kitchen, to also serve a shower 29. A tertiary generator 3, connected to generators 1 and 2 according to the diagram in FIG. 3, is placed under a sink 42, therefore at a point still a little further from the primary generator. Advantageously, therefore, this tertiary generator 3 is associated with a reservoir 37 with micro-accumulation to compensate for the temperature rise time of the primary generator. This freed us from the hot water circulation loops, expensive to install and which are sources of energy losses electric and thermal, while limiting the waiting time at the various draw-off points.

A final example of application of the "ulti-split" system is illustrated in FIG. 6. It shows the installation of several primary generators 1 in a collective building. The generators are in a technical sheath on the landings of the building, in the vicinity of each dwelling equipped with at least one secondary generator 2 installed under the same conditions as above. Such an installation authorizes the intervention of after-sales services without the need for an appointment with the occupant of the accommodation since the maintenance of the appliance essentially takes place only on the burner and the combustion block of the primary generator located in the technical sheath. This results in substantial savings in the cost of maintaining the boilers.

Finally a new advantage is provided by this device of the "multi-split" type. If a user has enlarged his house by adding for example an additional bathroom, or if the number of people occupying the accommodation has increased, he can to increase the power of the boiler, change the primary generator 1, and replace it with a more powerful without touching the existing secondary and tertiary generators. Thus, only half of the boiler needs to be replaced, which is particularly economical.

Claims

1. - Wall-mounted mixed gas boiler comprising a primary heat generator for heating, with a gas burner, a combustion chamber closed by a primary exchanger, a system for evacuating combustion products and a circulation pump for water in the appliance's heating circuit, and also comprising a secondary generator for the production of domestic hot water, consisting of a secondary exchanger with a three-way valve provided in the circuit of said generator, the primary generator, with 1 primary exchanger, the gas burner and its associated mechanisms, as well as the circulation pump, form a first module which is separate from other modules installed in geographically different places and each containing a secondary generator for the production of hot water sanitary, and which are connected to the heating circuit of the primary generator, characterized in that the primary generator (1) is associated with at least two domestic hot water generators, namely a secondary generator (2) with an exchanger (20), and a tertiary generator (3) with a tertiary exchanger (30) according to which the short circuit (31) of said tertiary generator is connected on one side to the heating circuit of the primary generator, and on the other to the short circuit (21) of the secondary generator.

2.- mixed wall gas boiler according to claim 1, characterized in that the short circuit (31) of the tertiary generator (3) is connected to the short circuit (21) of the secondary generator (2) via a three-way valve (32), in series with the three-way valve (22), on said short circuit (21).

3. - Wall-mounted mixed gas boiler according to claim 1, characterized in that the duct (35) for starting domestic hot water from one tertiary exchanger (30) is connected to a microaccumulation tank (37) equipped with a temperature sensor (36).

4. - Wall-mounted mixed gas boiler according to claim 3, characterized in that the micro-accumulation tank (37) is maintained at temperature by an electrical resistance (38).

5. - Mixed wall gas boiler according to claim 3, characterized in that a thermostatic valve (40) at the outlet of the tank (37), mixes the hot water produced by the tertiary generator (3) with the cold water of the network.

6.- Wall-mounted mixed gas boiler according to claim 2, characterized in that a stepping motor (41) operates the three-way valve (32) for fine adjustment of the water flow in the two sanitary exchangers (20, 30) .