EP3800403A1 - Procédé de fonctionnement d'un dispositif de chauffage, dispositif de chauffage - Google Patents

Procédé de fonctionnement d'un dispositif de chauffage, dispositif de chauffage Download PDF

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Publication number
EP3800403A1
EP3800403A1 EP20198935.7A EP20198935A EP3800403A1 EP 3800403 A1 EP3800403 A1 EP 3800403A1 EP 20198935 A EP20198935 A EP 20198935A EP 3800403 A1 EP3800403 A1 EP 3800403A1
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EP
European Patent Office
Prior art keywords
heat exchanger
heating
drinking water
heating mode
hxm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20198935.7A
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German (de)
English (en)
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EP3800403B1 (fr
Inventor
Ozan Mert Balci
Yusuf Emre Tiric
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Bosch Termoteknik Isitma ve Klima Sanayi Ticaret AS
Original Assignee
Bosch Termoteknik Isitma ve Klima Sanayi Ticaret AS
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Publication of EP3800403A1 publication Critical patent/EP3800403A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
    • F24D19/1069—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water regulation in function of the temperature of the domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0235—Three-way-valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/06—Heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F24D3/087—Tap water heat exchangers specially adapted therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • heating device for heating at least one room and for heating drinking water with a heat generator, with flow and return lines for connecting to at least one room heater, with a drinking water heat exchanger, and with a switchable connecting line for connecting the drinking water heat exchanger with the flow and Return lines.
  • the invention is based on a method for operating a heating device, in particular a combination heater.
  • the method includes a space heating mode and a domestic hot water mode.
  • space heating mode heating fluid is heated and conveyed to space heaters connected or connectable to the heating device.
  • the at least one space heater is arranged in a room to be heated.
  • the room heating mode is used to heat at least one room.
  • domestic hot water mode the heating fluid is heated and converted into a
  • the drinking water heat exchanger integrated in the heating device is promoted, with drinking water flowing through the drinking water heat exchanger being heated.
  • the invention is characterized by a heat exchanger heating mode, with heating fluid being heated during operation in the heat exchanger heating mode and conveyed to the drinking water heat exchanger, with drinking water present in the drinking water heat exchanger being heated, in particular to a standby temperature, with operation in the heat exchanger heating mode outside of operation in the drinking hot water mode and takes place from operation in space heating mode.
  • a heating device is understood here to mean, for example, a heater, a boiler or a heating system for heating at least one room, in particular an apartment or house, by means of one or more room heaters, and for heating drinking water, in particular a drinking water flow, by means of a drinking water heat exchanger.
  • a heating device is to be understood as a combination heater that is used both for heating a room and for heating drinking water.
  • the heating device comprises a heat generator, flow and return lines and, optionally, a circulation pump.
  • the circulating pump can be a simple switchable pump that can be switched on and off and has a fixed or predeterminable speed.
  • the circulating pump can also be a variable-speed pump, the delivery rate of which can be modulated between a minimum and a nominal value.
  • Operating a heating device is to be understood as meaning that the heating device is operated in different operating modes in a controlled and / or regulated manner for the purpose of room heating as well as drinking water heating.
  • the heating device is operated in space heating mode or in domestic hot water mode.
  • the operation of the heating device is controlled and / or regulated by a control and / or regulating device.
  • a heating fluid is to be understood as meaning, for example, heating water (for example water or a mixture of water and additives) that is heated by the heat generator and, in the room heating mode, by the circulation pump
  • Flow and return lines can circulate circulated in a heating circuit to the space heaters.
  • the space heaters which are usually not included in the heating device, can give off the heat of the heating fluid to the room air and the room in which they are installed.
  • the drinking water heat exchanger is connected by means of a connecting line in such a way that it can be touched by heating fluid on its primary side and / or by drinking water on its secondary side, in particular flowing around or through it.
  • the drinking water heat exchanger is a plate heat exchanger through which heating fluid and / or drinking water can flow.
  • the domestic hot water that is drawn is freshly heated in the hot water mode by the heating fluid according to the flow principle.
  • the heating fluid is heated by the heat generator and, in domestic hot water mode, circulated by the circulation pump through the flow and return lines, the connecting line and the primary side of the drinking water heat exchanger, while the domestic hot water that is drawn off flows on the secondary side.
  • the drinking water heat exchanger can be integrated in the heating device, which means that it is arranged in a fixed spatial and functional association in the heating device and is hydraulically connected.
  • the heat exchanger heating mode is used to preheat and keep warm the drinking water heat exchanger and in particular the drinking water present in the drinking water heat exchanger, in particular at a standby temperature, outside of tapping times.
  • the standby temperature can, for example, assume a value in the range from 40 ° C. to 70 ° C., in particular in the range from 50 ° C. to 60 ° C.
  • hot drinking water is immediately available at an outlet of the drinking water heat exchanger.
  • the heating fluid is heated by the heat generator and, in the heat exchanger heating mode, is circulated by the circulation pump through the flow and return lines, the connecting line and the primary side of the drinking water heat exchanger, while no hot water flows on the secondary side. Of the Drinking water heat exchangers and the non-flowing drinking water in the drinking water heat exchanger are thus heated and kept warm.
  • the fact that the operation in the heat exchanger heating mode takes place out of the operation in the room heating mode is to be understood as meaning that a preceding operation in the room heating mode, in particular directly or indirectly, is a prerequisite for the start of a subsequent operation in the heat exchanger heating mode.
  • a preceding operation in the room heating mode in particular directly or indirectly, is a prerequisite for the start of a subsequent operation in the heat exchanger heating mode.
  • there is no significant interruption of heat generation between the previous operation in space heating mode and the subsequent operation in heat exchanger heating mode and there is also no operation in domestic hot water mode.
  • the process is also very energy-efficient.
  • the heat required in the heat exchanger heating mode for preheating and keeping the potable water heat exchanger warm and in particular the potable water present in the potable water heat exchanger is essentially taken over directly from the previous operation in the room heating mode.
  • the heat generator, the flow and return lines, the circulation pump and any other components such as valves do not have to be specially heated for operation in heat exchanger heating mode, as they are from the previous operation in room heating mode are already warm. There are no heating losses and / or cooling losses of these components on the part of the heating device.
  • Operation in heat exchanger heating mode can be followed by operation in space heating mode. Even with this change of operating mode, there are therefore no heating losses and / or cooling losses.
  • the heat generator, the flow and return lines, the circulation pump and any other components such as valves do not have to be specially heated for operation in room heating mode, as they are already warm from the previous operation in heat exchanger heating mode.
  • An advantageous embodiment of the method is characterized in that the operation in the heat exchanger heating mode at least temporarily superimposes or interrupts the operation in the space heating mode.
  • the fact that two operating modes are superimposed here means in particular that the modes take place simultaneously, at least in segments, that an operation in a further mode is added to an operating mode that is already active.
  • This has the advantage that the operating mode that is already active and a supply task assigned to it (for example supplying the room heater with heat) do not have to be interrupted.
  • one operation interrupts the other operation means in particular that operation in the two operating modes does not take place simultaneously, but that operation in one operating mode is terminated in favor of the other and / or that operation in the other operating mode is terminated in favor of one , that is, they follow one another in time and are separated from one another in time.
  • the two operating modes can alternate intermittently. This has the advantage that the respective supply task (supplying the room radiator with heat or supplying the drinking water heat exchanger with heat) can be fulfilled without restriction.
  • a further advantageous embodiment of the method is characterized in that the operation in the heat exchanger heating mode as a function of a temperature and / or a profile of the temperature, in particular one measured in / on the drinking water heat exchanger Domestic hot water temperature or heating fluid temperature and / or a heating fluid temperature measured in / on the heat generator, in particular starting when the temperature falls below a first limit value and in particular ending when a second temperature limit value is exceeded.
  • a temperature at the drinking water heat exchanger or at the heat generator here means a temperature of a heat exchanger wall or heat generator wall, but can also mean a wall temperature of a hot water or heating fluid line at the outlet or in the vicinity of the outlet of the drinking water heat exchanger or the heat generator.
  • the temperature limit values correlate with the standby temperature to which the drinking water heat exchanger is preheated.
  • the first temperature limit value represents a minimum temperature to be maintained
  • the second temperature limit value represents a maximum temperature to be maintained.
  • a temperature profile here means observing the values of a temperature profile and / or a gradient of the temperature profile over time. This means that operation in the heat exchanger heating mode is based on demand and in a forward-looking manner.
  • this operating time can be an operating time that has elapsed since the end of the most recent previous operation in the heat exchanger heating mode.
  • this operating time can be an operating time that has elapsed since the start of a currently active operation in space heating mode.
  • this operating time can be an operating time that has elapsed since the end of the most recent previous operation in the domestic hot water mode. For example, it is checked whether the operating time has already reached or exceeded a specifiable minimum operating time. This means that operation in the heat exchanger heating mode is based on demand.
  • a further advantageous embodiment of the method is characterized in that, for setting and / or switching the heat exchanger heating mode, an adjusting means and / or a switching means is set and / or switched that directs a heating fluid flow.
  • the drinking water heat exchanger is connected by means of an adjustable and / or switchable connection line so that it can be touched by heating fluid on its primary side and / or by drinking water on its secondary side, in particular flowing around or through it.
  • the adjusting means and / or the switching means turn the simple connecting line into the adjustable and / or switchable connecting line.
  • the drinking water heat exchanger is a plate heat exchanger through which heating fluid and / or drinking water can flow. When domestic hot water is required, the domestic hot water that is drawn is freshly heated in the hot water mode by the heating fluid according to the flow principle.
  • the heating fluid is heated by the heat generator and, in domestic hot water mode, circulated by the circulation pump through the flow and return lines, the connecting line and the primary side of the drinking water heat exchanger, while the domestic hot water that is drawn off flows on the secondary side.
  • the drinking water heat exchanger can be integrated in the heating device, which means that it is arranged in a fixed spatial and functional association in the heating device and is hydraulically connected.
  • the adjustable and / or switchable connecting line comprises actuating means and / or switching means, in particular a three-way valve, for diverting the heating fluid flow between the heating circuit with room heaters and / or the drinking water heat exchanger.
  • Another advantageous embodiment of the method is characterized in that when operating in the heat exchanger heating mode, at least a partial amount of the heated heating fluid, that is, a partial flow of the entire heated heating fluid flow, is conveyed to the drinking water heat exchanger. Any remaining amount of the entire heating fluid flow is conveyed to the heating circuit with the space heaters.
  • the heating fluid is heated by the heat generator and circulated by the circulating pump through the flow and return lines and at least partially through the connecting line and the primary side of the drinking water heat exchanger, while the domestic hot water is on the secondary side does not flow, but is preheated.
  • An adjusting means is understood here to mean a means for dividing the heating fluid flow between the heating circuit with space heaters on the one hand and the drinking water heat exchanger on the other hand, the heating fluid being divided in variable proportions between the two heat consumers (space heater, drinking water heat exchanger).
  • a switching means is understood here to mean a means with which the heating fluid flow is directed either into the heating circuit with the space heaters or to the drinking water heat exchanger.
  • a further advantageous embodiment of the method is characterized in that the operation in the heat exchanger heating mode takes place briefly, in particular with a, in particular predeterminable, duration from the range 0.1 ... 5 minutes. This is the time during which the heating fluid flows through the drinking water heat exchanger for preheating and keeping warm. This short duration is sufficient because the drinking water rests on the secondary side. You can then switch back to room heating mode.
  • the duration the method can be adapted to individual conditions of the heating device such as heat generator output, line lengths, size and / or user behavior of the drinking water heat exchanger.
  • Another advantageous embodiment of the method is characterized in that the operation in the heat exchanger heating mode takes place repeatedly, in particular with a repetition frequency from the range 0.05 ... 1 per minute.
  • These successive operations can be used in such a way that the drinking water heat exchanger is always at the standby temperature and thus ready for hot water tapping.
  • these successive operations can be used in such a way that the heating to the standby temperature takes place gradually from operation to operation; for example, a longer interruption of the room heating mode can be avoided.
  • the method can be adapted to individual conditions of the heating device such as heat generator output, line lengths, size of the drinking water heat exchanger and / or user behavior.
  • the minimum delivery rate of the circulation pump or the switched-off circulation pump have the advantage that when setting or switching the actuating / switching means, water hammers cannot be damaged in the lines of the heating device.
  • the minimum heat output of the heat generator that is not switched off has the advantage that the heat generator, the flow and return lines, the circulating pump and any other components do not cool down; on the other hand, the heat generator or the heating fluid present in the heat generator that is used in switched off circulation pump stands for a short time, does not overheat and does not damage the heating device.
  • the minimum heat output can be, for example, in the range 10% to 30% of the nominal heat output of the heat generator.
  • the invention also relates to a heating device for heating at least one room and heating drinking water, in particular a drinking water flow.
  • the heating device comprises a heat generator, in particular whose heat output can be modulated, for heating a heating fluid; at least one flow line and one return line for connecting the heat generator to at least one space heater in a manner that conducts heating fluid; a drinking water heat exchanger and an adjustable and / or switchable connecting line, the drinking water heat exchanger being connected by means of the connecting line to the flow line and the return line in a manner that conducts heating fluid; as well as a control and / or regulating device which is provided to adjust and / or switch the connecting line and to reduce and / or stop a conveyance of heating fluid through the flow line and the return line to the space heater for a heat exchanger heating mode, as well as a conveyance to increase and / or release of heating fluid through the connecting line to the drinking water heat exchanger.
  • a heating device is provided for carrying out a method according to one of the preceding descriptions.
  • the adjustable and / or switchable connecting line comprises at least one stepped or continuously adjustable or switchable adjusting means and / or switching means, in particular a three-way valve, the adjusting / switching means being provided to supply the heating fluid to direct variable or fixed proportions to the drinking water heat exchanger and / or to the space heater.
  • a step-switchable switching means can realize two end positions and optionally one or more further intermediate positions. Accordingly, the heating fluid can be used in a first end position exclusively for the space heater, or in a second end position exclusively for the Drinking water heat exchanger, or in an optional further intermediate position for a fixed division into two partial flows to the room heater and the drinking water heat exchanger.
  • a continuously adjustable adjusting means can realize any intermediate positions between the two end positions and arbitrarily divide the heating fluid into two variable partial flows to the room heater and the drinking water heat exchanger.
  • the invention also relates to a computer program which is set up to carry out the steps of at least one of the methods described above.
  • the invention also relates to a machine-readable storage medium on which the computer program is stored.
  • the invention also relates to an electronic control and / or regulating device which is set up to carry out the steps of at least one of the methods described above.
  • FIG. 1 shows a schematic structure of an exemplary embodiment of the heating device 100.
  • the heating device 100 is used to heat at least one room and to heat drinking water, in particular a drinking water flow.
  • the heating device 100 comprises a heat generator B, which can be modulated in terms of its heat output, for heating a heating fluid.
  • the heat generator B comprises a fuel-fired burner. Conveyed by a circulation pump P, the heating fluid can circulate through the heat generator B, a flow line 102 and a return line 104.
  • the flow and return lines 102, 104 are connected or can be connected to at least one space heater 202 by means of connecting elements 106 in a manner that conducts heating fluid.
  • the heating fluid circulation from the heat generator B via the flow and return lines 102, 104 to the at least one space heater 202 represents, at least in sections, a heating circuit 200 external to the heater.
  • heated heating fluid is conveyed to at least one space heater 202.
  • the heating device 100 comprises a drinking water heat exchanger 108, on the secondary side of which drinking water can be heated.
  • the drinking water heat exchanger 108 is connected or can be connected to a drinking water source 300 and to at least one drinking water tap 302 by means of connecting elements 110.
  • the drinking water heat exchanger 108 can be heated by heating fluid.
  • the drinking water heat exchanger 108 is connected by means of an adjustable and / or switchable connecting line 112 to the flow line 102 and the return line 104 in a manner that conducts heating fluid.
  • heated heating fluid is conveyed to the drinking water heat exchanger 108, the drinking water flowing through the drinking water heat exchanger 108 being heated.
  • the connecting line 112, and with it the drinking water heat exchanger 108, can be switched into a heating circuit 114 internal to the heating device by means of an actuating or switching means V.
  • actuating or switching means V In a first end position of the actuating or Switching means V circulates the heating fluid, as described above, in the heating circuit 200 external to the heating device to the at least one space heater 202.
  • the heating fluid In a second end position, the heating fluid circulates in the heating circuit 114 internal to the heating device from the heat generator B via the flow and return lines 102, 104 and the connecting line 112 to the Drinking water heat exchanger 108.
  • the heating device 100 comprises a control and / or regulating device 116 which is provided to adjust and / or switch at least the connecting line 112, in particular to adjust and / or switch at least the adjusting or switching means V of the connecting line 112.
  • the control / regulating device 116 also serves to control or regulate the heat generator B and the circulating pump P, and to receive a temperature signal (signal / current / voltage lines are shown in dashed lines) from a connected temperature sensor 118a.
  • the temperature sensor 118a is arranged on the flow line 102 on an output side of the heat generator B and measures a flow temperature of the heat generator B.
  • a temperature sensor 118b, 118c can be arranged on an output side of the drinking water heat exchanger 108, for example on a hot water outlet side and / or a heating fluid return side of the drinking water heat exchanger 108, and measure the outlet temperature of the domestic hot water and / or the return temperature of the heating fluid.
  • the drinking water heat exchanger 108 is flowed through and heated by heated heating fluid when drinking hot water is tapped in the drinking hot water mode DWM. After a domestic hot water tap and outside of operation in the domestic hot water mode DWM, if no remedial measure were taken, the drinking water heat exchanger 108 and the drinking water present in it could cool down. This would initially lead to tapping of drinking water at a temperature that is too low if the hot water is drawn again at a later time.
  • the heat exchanger heating mode HXM which takes place outside of an operation in the domestic hot water mode DWM and from an operation in the room heating mode CHM, ensures that both the drinking water heat exchanger 108 and the drinking water present in it always at a standby temperature, as desired or expected by a user, or are regularly heated to standby temperature. Even if drinking hot water is drawn again at a later time, even if there are longer intervals between hot water taps, drinking water is drawn off at a sufficient, comfortable temperature from the start of drawing.
  • the heat exchanger heating mode HXM takes place from the room heating mode CHM, i.e.
  • the operation in the heat exchanger heating mode HXM or the changeover / switchover to the heat exchanger heating mode HXM can take place as a function of a temperature and / or a profile of the temperature, for example as a function of a flow temperature of the heating fluid measured downstream of the heat generator B by means of the temperature sensor 118a.
  • the changeover / switchover begins when the temperature falls below a first, lower temperature limit value and ends when a second, upper temperature limit value is exceeded.
  • the first temperature limit value is a slight deviation below the standby temperature.
  • the second temperature limit value is a slight deviation above the standby temperature.
  • the amount of the deviations is advantageously in a range of 1 ... 5 ° C.
  • the control / regulating device 116 is provided for a heat exchanger heating mode HXM to reduce and / or stop a conveyance of heating fluid through the flow line 102 and the return line 104 to the space heater 202 and to stop conveyance of heating fluid through the connecting line 112 to the drinking water heat exchanger 108 to increase and / or release.
  • a heat exchanger heating mode HXM to reduce and / or stop a conveyance of heating fluid through the flow line 102 and the return line 104 to the space heater 202 and to stop conveyance of heating fluid through the connecting line 112 to the drinking water heat exchanger 108 to increase and / or release.
  • at least one intermediate position is also conceivable, at least in the heat exchanger heating mode HXM, in which the heating fluid is divided into two partial quantities by means of the actuating / switching means V, of which a first partial quantity flows through the connecting line 112 to the drinking water heat exchanger 108 and one second subset flows to at least one space heater 202.
  • the system limit of the heating device 100 is indicated by a dash-dot line.
  • the space heater 202 and connected supply lines 204 and discharge lines 206 for connecting to the flow and return lines 102, 104 are not part of the heating device 100 in the present case.
  • FIG. 2 shows a time sequence of an exemplary behavior of heat generator B, circulating pump P and control / switching means V over time t when switching or switching the operation from the room heating mode CHM to the heat exchanger heating mode HXM and back again to the room heating mode CHM.
  • the changeover or switchover of the operation to the heat exchanger heating mode HXM, starting in the room heating mode CHM is prepared by modulating the heat output of the heat generator B, for example starting from a nominal heat output B-nom to a minimum heat output B-min other than zero. This is followed by switching off the circulating pump P, which was previously switched on, from a pump switching state P-1 to a pump switching state P-0. In the pump switching state P-0, the circulation pump P does not deliver any heating fluid.
  • the actuating / switching means V sets or switches from a first end position V-E1 to a second end position V-E2 (solid line) .
  • the actuating / switching means V sets or switches from a first end position V-E1 into an intermediate position VZ (dashed line).
  • the heating fluid flows via flow and return lines 102, 104 to the at least one room heater 202 (room heating mode CHM).
  • room heating mode CHM room heating mode
  • the heating fluid flows at least partially to the drinking water heat exchanger 108 (heat exchanger heating mode HXM).
  • the circulation pump P is switched on again (pump switching state P-1).
  • the heating device 100 sets or switches over from the room heating mode CHM to the heat exchanger heating mode HXM.
  • the pump switching state here stands for a switched and / or regulated delivery rate and / or speed of the circulating pump P.
  • the pump switching state P-1 can stand for a nominal delivery rate and / or speed, for example.
  • the pump switching state P-1 can also stand for a higher delivery rate and / or speed which deviates from the pump switching state P-0.
  • the pump switching state P-0 can, for example, stand for a switched-off circulation pump with no delivery rate (delivery rate and speed equal to zero).
  • the pump switching state P-0 can also stand for a minimum delivery rate and / or speed that deviates from zero.
  • the circulating pump P can be a simple switchable pump that can be switched on and off and has a fixed or predeterminable speed.
  • the circulating pump P can also be a variable-speed pump, the delivery rate of which can be modulated between a minimum and a nominal value.
  • Operation of the heating device 100 in the heat exchanger heating mode HXM excludes operation in the domestic hot water mode DWM.
  • operation in domestic hot water mode DWM also excludes operation in heat exchanger heating mode HXM.
  • Operation in the heat exchanger heating mode HXM can generally take place for a short time and ends, for example, after a, in particular predeterminable, duration in the range 0.1 ... 5 minutes.
  • This duration can be sufficient to heat the drinking water heat exchanger 108 and the drinking water present in it to the standby temperature.
  • the duration can be fixed at the factory. Alternatively, the duration can also be specified by a heating installer or user of the heating device 100 via the control and / or regulating device 116.
  • Operation in the heat exchanger heating mode HXM can also end when a temperature measured in / on the drinking water heat exchanger 108 and / or in / on the heat generator B reaches or exceeds a (second) temperature limit value.
  • the previously switched on circulating pump P switches off from a pump switching state P-1 to a pump switching state P-0.
  • the circulation pump P does not deliver any heating fluid.
  • the actuating / switching means V sets or switches from a second end position V-E2 (solid line) or from an intermediate position VZ (dashed line) Line) to a first end position V-E1.
  • the heating fluid flows at least partially to the flow and return lines 102, 104 Drinking water heat exchanger 108 (heat exchanger heating mode HXM).
  • the entire heating fluid flow flows to the at least one space heater 202 (space heating mode CHM).
  • the circulation pump P is switched on again (pump switching state P-1).
  • the heating device 100 sets or switches over from the heat exchanger heating mode HXM to the room heating mode CHM.
  • FIG. 3 shows a schematic process sequence according to the invention. The following steps are implemented by the control / regulating device 116.
  • a first step S1 it is checked whether the room heating mode CHM is currently active.
  • the heat generator B supplies a heat output, for example a nominal heat output B-nom, alternatively also a heat output that is adapted to a current requirement and deviates from the nominal heat output B-nom, and heats the heating fluid; furthermore, the circulation pump P is switched on and, in a pump switching state P-1, conveys heating fluid;
  • the actuating / switching means V is also in a first end position V-E1 and the heating fluid circulates through the heat generator B and the flow and return lines 102, 104 to the at least one space heater 202.
  • a second step S2 checks whether a current operating period has already reached or exceeded a predeterminable minimum operating period. If the current operating time reaches or exceeds the specified minimum operating time, the heat exchanger heating mode HXM can be enabled.
  • This current operating time can be, for example, an operating time that has elapsed since the beginning or the end of the most recent previous operation in the heat exchanger heating mode HXM. Alternatively, this current operating time can be an operating time that has elapsed since the start of the currently active operation in the room heating mode CHM. Alternatively, this current operating time can be an operating time that has elapsed since the end of the most recent previous operation in the domestic hot water mode DWM. This check ensures that the heating device 100 does not go into the heat exchanger heating mode too often HXM switches and there are not too many on / off cycles within one time unit, which could overload the components involved.
  • step S2 If (as long as) in the test after step S2 the current operating time does not (yet) reach or does not (yet) exceed the specifiable minimum operating time, the heat exchanger heating mode HXM is not released. Instead, the process flow jumps to a twelfth step S12 (see description of the process details below) and the heating device 100 is operated in the space heating mode CHM as required. If the heating device 100 continues to operate or is operated again in the room heating mode CHM, the test according to step S1 then follows with any further steps following the method described here.
  • a third step S3 checks whether the, in particular current, temperature measured in particular by means of one of the temperature sensors 118a, 118b, 118c, has reached or exceeded a first temperature limit value has fallen below.
  • the heat exchanger heating mode HXM can be enabled.
  • the temperature can be a domestic hot water temperature or heating fluid temperature measured in or on the drinking water heat exchanger and / or a heating fluid temperature measured in or on the heat generator, in particular a temperature measured at the respective water or fluid outlet.
  • step S3 If (as long as) the current temperature does not (yet) reach the first temperature limit value or does not (yet) fall below the test after step S3, the heat exchanger heating mode HXM is not enabled. Instead, the process flow jumps to the twelfth step S12 (see description of the process details below) and the heating device 100 is operated in the space heating mode CHM as required. If the heating device 100 continues to operate or is operated again in the room heating mode CHM, the test according to step S1 then follows with any further steps following the method described here.
  • a fourth step S4 the heat output of the heat generator B is controlled and / or regulated to a minimum, non-zero, value B-min.
  • the heat generator B remains switched on.
  • a circulation pump P is switched off in a pump switching state P-0.
  • the circulation pump P does not deliver any heating fluid.
  • the adjusting / switching means V is switched into a second end position V-E2 or into an intermediate position V-Z.
  • the heating fluid can at least partially flow to the drinking water heat exchanger 108 (heat exchanger heating mode HXM).
  • the circulation pump P is switched on into a pump switching state P-1.
  • the circulation pump P conveys heating fluid so that the heating fluid circulates through the heat generator B and the flow and return lines 102, 104 at least partially to the connecting line 112 and to the drinking water heat exchanger 108.
  • a subsequent eighth step S8 it is checked whether the temperature, in particular the measured temperature, has reached or exceeded a second temperature limit value.
  • the temperature can be a domestic hot water temperature or heating fluid temperature measured in or on the drinking water heat exchanger and / or a heating fluid temperature measured in or on the heat generator, in particular a temperature measured at the respective water or fluid outlet.
  • step S8 If, during the check after step S8, the temperature does not reach or does not exceed the second temperature limit value, the method returns to step S7.
  • step S9 follows.
  • the circulation pump P is switched off in a pump switching state P-0. In the pump switching state P-0, the circulation pump P does not deliver any heating fluid.
  • actuating / switching means V is switched to a first end position V-E1.
  • the heating fluid can flow exclusively to the at least one space heater 202.
  • the circulation pump P is switched on to a pump switching state P-1.
  • the circulation pump P conveys heating fluid so that the heating fluid circulates through the heat generator B and the flow and return lines 102, 104 to the at least one space heater 202.
  • the heating device 100 is operated in the room heating mode CHM as required, in particular the heat output of the heat generator B is modulated according to an existing room heat demand, for example to a nominal heat output B-nom.
  • the heating device 100 switches off. In particular, the heat generator B and the circulation pump P are switched off.
  • step S1 then follows with any further steps following the method described here.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
EP20198935.7A 2019-10-01 2020-09-29 Procédé de fonctionnement d'un dispositif de chauffage, dispositif de chauffage Active EP3800403B1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0886110A2 (fr) * 1997-06-19 1998-12-23 Robert Bosch Gmbh Méthode pour préparer l'eau sanitaire dans un système mixte
US20180073749A1 (en) * 2016-09-14 2018-03-15 Lochinvar, Llc Methods And System For Controlling A Combination Boiler
US20180073748A1 (en) * 2016-09-14 2018-03-15 Lochinvar, Llc Methods And System For Demand-Based Control Of A Combination Boiler
US20180120824A1 (en) * 2016-11-01 2018-05-03 Rinnai Corporation Heat source device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0886110A2 (fr) * 1997-06-19 1998-12-23 Robert Bosch Gmbh Méthode pour préparer l'eau sanitaire dans un système mixte
US20180073749A1 (en) * 2016-09-14 2018-03-15 Lochinvar, Llc Methods And System For Controlling A Combination Boiler
US20180073748A1 (en) * 2016-09-14 2018-03-15 Lochinvar, Llc Methods And System For Demand-Based Control Of A Combination Boiler
US20180120824A1 (en) * 2016-11-01 2018-05-03 Rinnai Corporation Heat source device

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