WO2020035393A1

WO2020035393A1 - Heating system

Info

Publication number: WO2020035393A1
Application number: PCT/EP2019/071345
Authority: WO
Inventors: Markus Jäger; Johannes Laging; Mario Möhring; Wolfgang MUSELMANN; Elmar Ströhle; Peter Wickelmaier
Original assignee: Truma Gerätetechnik GmbH & Co. KG
Priority date: 2018-08-17
Filing date: 2019-08-08
Publication date: 2020-02-20
Also published as: DE102018006492A1

Abstract

The invention relates to a heating system (1) for producing hot air and/or for heating a liquid. According to the invention, two combustion units (2) are coupled to each other by common combustion air and/or a gas-air mixture composed of combustion air and a component (20, 23, 24) supplying gaseous fuel or fuel offset in a gaseous state.

Description

heating system

The invention relates to a heating system for generating hot air and / or for heating a liquid.

So-called combination heaters are known in the prior art which allow different media to be heated in one device. A burner heats z. B. air and water. The heated air is used for heating purposes and the water is, for example, process water. Alternatively, two liquids are heated by a burner, e.g. B. a glycol mixture for heating and water as service water. Such single-burner devices are characterized by their low cost and the small space requirement. Such a heating arrangement is disclosed, for example, in DE 34 48 062 C2.

However, it is disadvantageous that the two media (ie water and air or glycol mixture and water) cannot be heated independently of one another. There is always a thermal coupling so that the efficiency is not optimal. In mixed operation, for example, the heating of the medium used for the heating function (air or glycol mixture) is usually decisive, and reaching the desired water temperature is more subordinate. This means that all-round optimal comfort for the user cannot be achieved.

The use of two combustion chambers is e.g. B. disclosed in DE 24 07 664 A1.

The object of the invention is to propose a heating system which provides increased comfort with regard to the desired media temperatures and which also permits improved and thermally decoupled heating of different media.

The invention solves the problem with a heating system for generating hot air and / or for heating a liquid, with at least two combustion devices, and with at least one heat exchanger and / or a liquid container, the two combustion devices being coupled to at least one shared component , The increased comfort results from the use of two burners, where with a suitable design of the burners a higher heating output can be achieved. There are therefore two fireplaces in the heating system. Furthermore, the costs and also the installation space are reduced in that at least one component is shared by the two burning devices. The shared component is preferably a component relevant to the burning process. The coupling between the two burning devices and the at least one shared component is dependent on the nature of the component. The coupling relates, for example, to the spatial arrangement, to a thermal coupling, to an electrical or mechanical coupling, etc. The coupling can also consist of a type of assignment. Depending on the design, the heating system allows the heating of different media (eg air and a liquid) or only one medium. Therefore, depending on the design, there is no liquid container or no heat exchanger for heating air if only air or only one liquid is to be heated. The heat exchanger mentioned is preferably a flue gas-medium heat exchanger, the medium in this connection, for. B. air or water or a glycol mixture, etc.

In one embodiment, there are more than two burning devices. In this embodiment, at least two, z. B. three, four, five, etc. burners are available. At least two or more burning devices use a common component.

One embodiment consists in the fact that several components are assigned to the at least two burning devices for common use. In this embodiment, several (that is, at least two) components serve for the combustion processes of the at least two combustion devices. So there is more shared use, so that more components can be saved.

One embodiment provides that a shared component is a housing that surrounds at least the two burning devices, that the housing is tight against an environment, and that the housing has passages for media. The two burners are enclosed by a common housing that over Corresponding passages for the supply and / or discharge of media (these are the media to be heated, for example air or a liquid, or the fuel required for combustion). The tightness may refer to the required IP protection class, e.g. B. Tightness against water, dust, air, etc.

One embodiment consists in that the housing consists at least partially of a foamed production material that takes on a thermally insulating function. Depending on the design, the thermal insulation relates to the insulation of the interior of the heating system from the surroundings or alternatively or additionally to insulation between the two combustion devices.

One embodiment provides that a shared component is a blower, that the blower supplies combustion air and / or a gas-air mixture of combustion air and a fuel in a gaseous or gaseous state to the two combustion devices and / or discharges exhaust gases from the two combustion devices. One embodiment ensures that the total volume flow moved by a combustion air blower is always such that the combustion devices supplied with it can be operated in full load operation. In one embodiment, different pressure drops are generated, so that a suitable distribution of the combustion air to the individual combustion devices is realized. The gas-air mixture consisting of the combustion air and a gaseous fuel or a fuel which has been brought into a gaseous state can also be referred to as a combustion air-fuel mixture.

One embodiment consists in that a progressive flow resistance is arranged in at least one guide channel which opens onto one of the two combustion devices and which is connected to the fan. In this embodiment, the air or a gaseous substance that is supplied to a combustion device is reduced to a fixed value by a progressive flow resistance. In one embodiment, this relates to the fact that a blower is assigned to the two combustion devices, but that a combustion device is to be supplied with a constant amount of combustion air. In order not to have to provide an additional actively controlling or regulating unit in this case, the flow resistance is used here, which has a greater resistance depending on the air volume. One embodiment provides that a shared component is a blower shaft, that the blower shaft is assigned to at least two blowers, that the at least two blowers at least one of the two combustion devices combustion air and / or a gas-air mixture of combustion air and a gaseous or in supply a fuel in a gaseous state and / or discharge exhaust gases, and that the two fans are assigned to one of the two combustion devices or each of the two fans is assigned to only one of the two combustion devices. In this configuration, two fans are connected to one another via a common shaft. This means that only one motor is required. This makes the structure more compact and less expensive. In one configuration, the two fans concerned are one combustion device and, in an alternative, they are each assigned to one combustion device. In one embodiment it is provided that only one motor is used which moves the common fan shaft.

One embodiment consists in that a shared component is a gas fitting, and that the gas fitting supplies the at least two combustion devices with a gaseous or in a gaseous state. Here the gas supply is realized via a common component.

One embodiment provides that the gas valve works in a modulating or stepwise manner. Depending on the combustion device, a modulating and step-by-step gas fitting can also be present.

One embodiment consists in that at least one solenoid valve is arranged between the gas fitting and the two combustion devices, and in that the solenoid valve causes a combustion process to be switched on or off at least one of the two combustion devices. In one configuration, each combustion device is assigned its own solenoid valve in order to be able to switch the respective combustion process on and / or off separately.

In one embodiment, a shared component is a fuel pump, the fuel pump supplying the two combustion devices with fuel. The fuel is therefore any combustible medium that can be moved by a pump. For example, it is diesel fuel. One embodiment provides that a shared component is a premixing blower, and that the premixing blower supplies the two combustion devices with a gas-air mixture of combustion air and a gaseous or liquid fuel that is in a gaseous state. In one configuration, the premixing fan supplies the at least two combustion devices with a gas / air mixture with a predeterminable gas / air ratio.

One embodiment consists of a shared component being a premixing blower with an integrated gas fitting.

One embodiment provides that the premixing blower is connected to the two combustion devices via two connecting sections and that at least one control device determining the flow of the gas-air mixture is present in at least one connecting section of the two connecting sections. In this embodiment, the two combustion devices are supplied with the gas-air mixture by a common premixing fan. For this purpose, the gas is quasi injected into the combustion air blower, where it is mixed with the sucked-in combustion air, for example in a spiral housing. The combustion air fan thus forms a mixing chamber for the mixing of fuel and combustion air. The control device is provided for the individual control of the respective quantity. The connecting sections are z. B. given over pipes or lines, etc.

One embodiment consists in the control device being provided by a flap. In one embodiment, it is an electromechanically operable flap.

One embodiment provides that a shared component is an automatic burner control unit and that the automatic burner control unit monitors flames in the two burner devices. In this configuration, the burning processes of the two burning devices are monitored by a common monitoring device in the form of the automatic burner control (for example by evaluating an ionization current).

One embodiment consists in that a shared component is a heat exchanger, that the heat exchanger with the two combustion devices is thermally is coupled, and that the heat exchanger is a flue gas-air heat exchanger. In this embodiment, the two combustion devices feed the respective exhaust gases to a common heat exchanger, which here in particular makes it possible to heat air.

One embodiment provides that a shared component is a heat exchanger, that the heat exchanger is thermally coupled to the two combustion devices, and that the heat exchanger is used to transfer thermal energy between the two combustion devices. In this embodiment, heat is exchanged between the two combustion devices via a common heat exchanger.

One embodiment consists in that the heat exchanger is essentially flat.

One embodiment provides that at least one combustion device is thermally coupled directly to a liquid container. In this embodiment, at least one burning device acts directly on a liquid container, so that, for example, the flame of the burning device comes into direct contact with the liquid container. Alternatively or in addition, the combustion chamber of the combustion device is located directly in the liquid container.

One embodiment is that a shared component is a liquid container and that the two burners are thermally coupled to the liquid container. In this embodiment, the two combustion devices heat the liquid container and thus also the liquid contained therein.

One embodiment provides that a shared component is an automatic igniter, and that the automatic igniter triggers burning processes in the at least two burning devices.

One embodiment consists of a shared component being a control unit, and the control unit triggering, ending, regulating and / or monitoring burning processes in the two burning devices. In this embodiment, the control unit is assigned to the two burning devices, so that, for example, the interaction of the burning devices can also be better coordinated. One embodiment provides that a shared component is an exhaust gas system, and that the exhaust gas system removes the exhaust gases generated during the combustion processes in the two combustion devices. In this embodiment, the exhaust gases of the two combustion devices are brought together via a common exhaust system and then preferably led out of the heating system together.

One embodiment consists in that a shared component is a combination fan, and that the combination fan both supplies combustion air to the two combustion devices and moves recirculated air for cooling heat exchanger surfaces. In this embodiment, a blower supplies the two combustion devices with the required combustion air and at the same time ensures that at least one heat exchanger surface is cooled by the moving air.

One embodiment provides that a shared component is an electric heating device and that the electric heating device is used to heat air and / or the liquid. In this embodiment, the two burners are supplemented by an electric heater.

One embodiment consists in that the elements forming the heating system are combined with one another according to a modular principle.

One embodiment provides that the heating system is designed for use in caravans or mobile homes. The heating system is thus designed in terms of weight and external dimensions so that it can be installed and operated in camping vehicles (e.g. in caravans or mobile homes). This possibility of application also relates to security aspects, etc.

In particular, there are a multitude of options for designing and developing the heating system according to the invention. For this purpose, reference is made on the one hand to the claims subordinate to patent claim 1, and on the other hand to the following description of exemplary embodiments in conjunction with the drawing. Show it:

1 is a schematic representation of a first embodiment of a heating system, 2 shows a schematic representation of a second embodiment of a heating system,

3 a) and b) two variants of a section of the embodiment of FIG. 2,

4 shows a schematic representation of a third embodiment of a heating system,

5 shows a schematic illustration of part of a fourth embodiment of a heating system,

Fig. 6 is a schematic representation of part of a fifth embodiment of a heating system and

Fig. 7 is a schematic representation of part of a sixth embodiment of a heating system.

1 schematically shows a heating system 1 with two burners 2 (alternative names are burners or fireplaces).

The two combustion devices 2 are each supplied with combustion air by a blower 20 and by a gas fitting 30 each with a combustible gas. An automatic igniter 55 starts the respective firing process and the firing process is monitored by an automatic firing device 50. The exhaust gases generated in the combustion processes are each fed to a heat exchanger 3 and then removed via separate exhaust systems 60. The control of the two combustion devices 2 and of the components connected to the combustion devices 2 in relation to the combustion process takes place here via a common control unit 56, which is assigned to both combustion devices 2 and serves both combustion devices 2.

A common combustion fan 20 is present in the configuration of the heating system 1 in FIG. 2.

Furthermore, a common exhaust system 60 is also provided here, which discharges the exhaust gases of the two combustion devices 2 together. Both burners 2 are located the here in a common housing 10, so that the heating system 1 also appears to the outside as a unit. The housing 10 has passages 1 1, which allow the entry of ambient air and the exit of the exhaust gases. One of the two combustion devices 2 is also connected to a liquid container 4, so that a liquid in this liquid container 4 can be heated.

Both combustion devices 2 receive the combustion air required for the combustion process via a shared blower 20, however the combustion device 2 shown here on the left is intended to receive a constant amount of air. In order to achieve this when only one combustion air blower 20 is used, a flow resistance 22 is provided in the (air) guide duct 21, which leads to the combustion device 2 concerned, which is designed to be progressive in that it also includes increasing total volume flow less air in relation to the total volume flow and thus allows a constant amount of air to pass for the guide channel 21. Therefore, the air mass flow for the downstream combustion device 2 remains essentially constant and there is, for example, a fixed power level for this combustion device 2. In the embodiment of FIG. 2, the progressive flow resistance 22 is implemented, for example, in the manner of a pressure regulator that has a constant Output pressure generated. The pressure regulator was followed by a fixed orifice, which then produces a constant air mass flow at a variable speed of the upstream fan 20. The variable speed allows the other combustion device 2 to be operated at different power levels.

In the variants of FIG. 3, further examples are indicated for the progressive flow resistance 22, in each of which a unit with a variable volume is used. For example, the progressive flow resistance 22 is a type of pressure-dependent nozzle that reduces its cross section at higher volume flows.

4 shows only part of a schematic heating system 1.

Each combustion device 2 is preceded by a valve and a blower 20 for the supply of combustion air. The amount of combustion air can be set separately here via the valves. The combustion air blowers 20 have a common fan shaft 23. Furthermore, there is a common electric heating device 70 which preheats the combustion air for both combustion devices 2. As a further shared component, there is also a heat exchanger 3 ′ which is used to exchange thermal energy between the two combustion devices 2.

FIG. 5 shows an exemplary embodiment in which the two combustion devices 2 are connected to a common gas fitting 30, which supplies the two combustion devices 2 with a combustible gas.

A solenoid valve 31 is assigned to each combustion device 2 for controlling the combustion processes and also for safely ending a combustion process. The solenoid valves 31 are located between the gas fitting 30 and the respective combustion device 2 and are preferably controlled separately in order to be able to safely interrupt or release the flow of gas to the respective combustion device 2.

In the embodiment in FIG. 6, a common premixing fan 24 is assigned to both combustion devices 2.

The premixing fan 24 generates a gas-air mixture from the combustion air and a gas, which is made available here via a gas fitting 30. The combustion air and the gas are mixed in a mixing chamber 40 formed by the premixing fan 24 and then fed to the two combustion devices 2 via a connecting section 41 in each case. The two connecting sections 41 thus connect the mixing chamber 40 or the premixing fan 24 to the two combustion devices 2.

Between the two connecting sections 41 there is a control device 42, which here has an electromechanically operable flap. The flap can in each case close a connecting section 41 so that the combustible gas-air mixture does not reach the assigned combustion device 2. In the case shown, for example, access to the combustion device 2 arranged on the left is closed by the flap 42. FIG. 7 shows an embodiment of a common exhaust system 60 to which the exhaust gases from the two combustion devices 2 approach.

Each burner 2 has a separate exhaust pipe. The two exhaust pipes are brought together in the exhaust system 60, a common fan 20 serving to move the exhaust gases being used.

In the embodiment shown, the combined exhaust gases pass a flue gas air heat exchanger 3, which transfers the thermal energy of the exhaust gases to the air to be heated. The circulating air is guided via the circulating air duct 61.

In the embodiment shown, the two combustion devices 2 are also supplied with fuel by a common fuel pump 35.

Reference list heating system

burning device

heat exchangers

‘Heat exchanger

liquid container

0 housing

1 pass

0 blowers

1 guide channel

2 flow resistance

3 blower shaft

4 premix blowers

0 gas valve

1 solenoid valve

5 fuel pump

0 mixing chamber

1 connecting section

2 control device

0 burner control

5 automatic igniter

6 control unit

0 exhaust system

1 air duct

0 electric heater

Claims

claims

1. heating system (1) for generating hot air and / or for heating a liquid,

with at least two burners (2), and

with at least one heat exchanger (3, 3 ') and / or a liquid container

(4)

wherein the two combustion devices (2) are coupled to at least one jointly used combustion air and / or a gas-air mixture of combustion air and a component (20, 23, 24) that supplies gaseous or fueled gas.

2. Heating system (1) according to claim 1,

the shared component being a blower (20),

wherein the fan (20) supplies the two combustion devices (2) with combustion air and / or a gas-air mixture of combustion air and a gaseous or gaseous fuel, and

A progressive flow resistance (22) being arranged in at least one guide channel (21) which opens onto one of the two combustion devices (2) and which is connected to the fan (20).

3. Heating system (1) according to claim 2,

the progressive flow resistance (22) means that the downstream combustion device (2) receives a constant amount of air and the other combustion device (2) can be operated at different power levels.

4. Heating system (1) according to claim 2 or 3,

wherein the progressive flow resistance (22) is designed as a pressure regulator.

5. Heating system (1) according to claim 4,

the progressive flow resistance (22) designed as a pressure regulator being followed by a fixed orifice.

6. Heating system (1) according to claim 2 or 3, the progressive flow resistance (22) having a variable volume unit.

7. heating system (1) according to claim 2 or 3,

the progressive flow resistance (22) being designed as a pressure-dependent nozzle.

8. Heating system (1) according to one of claims 1 to 7,

wherein the shared component is a blower shaft (23), the blower shaft (23) being assigned to at least two blowers (20), the at least two blowers (20) at least one of the two combustion devices (2) combustion air and / or one Supply gas-air mixture from combustion air and a gaseous or in a gaseous state fuel, and

wherein the two fans (20) are assigned to one of the two burners (2) or each of the two fans (20) is assigned to only one of the two burners (2).

9. Heating system (1) according to one of claims 1 to 8,

the shared component being a premix blower (24), the premix blower (24) supplying the two combustion devices (2) with a gas-air mixture of combustion air and a gaseous or liquid fuel, or a gaseous state,

the premixing fan (24) being connected to the two burners (2) via two connecting sections (41),

at least one control device (42) determining the flow of the gas-air mixture in at least one connecting section (41) of the two connecting sections (41) is present, and

the control device (42) being provided by a flap.

10. Heating system (1) according to one of claims 1 to 9,

wherein at least one combustion device (2) is thermally coupled directly to a liquid container (4).

11. Heating system (1) according to one of claims 1 to 10,

the elements forming the heating system (1) being combined with one another according to a modular principle.

12. Heating system (1) according to one of claims 1 to 1 1,

the heating system (1) being designed for use in caravans or mobile homes.