EP3425274B1 - Heizeinrichtung - Google Patents

Heizeinrichtung Download PDF

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Publication number
EP3425274B1
EP3425274B1 EP18178604.7A EP18178604A EP3425274B1 EP 3425274 B1 EP3425274 B1 EP 3425274B1 EP 18178604 A EP18178604 A EP 18178604A EP 3425274 B1 EP3425274 B1 EP 3425274B1
Authority
EP
European Patent Office
Prior art keywords
heater head
heating device
inflow
inflow unit
flame tube
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.)
Active
Application number
EP18178604.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3425274A1 (de
Inventor
Herbert Ortner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oekofen Forschungs und Entwicklungs GmbH
Original Assignee
Oekofen Forschungs und Entwicklungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oekofen Forschungs und Entwicklungs GmbH filed Critical Oekofen Forschungs und Entwicklungs GmbH
Priority to PL18178604T priority Critical patent/PL3425274T3/pl
Priority to RS20200489A priority patent/RS60206B1/sr
Publication of EP3425274A1 publication Critical patent/EP3425274A1/de
Application granted granted Critical
Publication of EP3425274B1 publication Critical patent/EP3425274B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
    • F23B80/04—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for guiding the flow of flue gases, e.g. baffles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0026—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion engines, e.g. for gas turbines or for Stirling engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers

Definitions

  • the invention relates to a heating device, in particular a boiler, with a combustion chamber for the combustion of solid fuel, in particular biomass, and a flame tube, the inflow region of which for flue gases released from the combustion faces the combustion chamber and the outflow region of which faces a subsequent outlet region for the removal of the flue gases is arranged in the outflow area, which has a tapering surface in the direction of the inflow area and is surrounded by an inflow unit delimiting the outflow area with an inner surface facing the heater head is, the clear cross-section widens in the direction of the outlet area, and an annular gap f between the outer surface of the heater head and the inner surface of the inflow unit r is formed the effluent flue gases, according to the preamble of claim. 1
  • Such heaters are from about AT 513.734 known to the applicant and serve to heat a medium for use as hot water or for heating purposes by means of the combustion of a solid fuel.
  • an additionally arranged heat engine such as a Stirling engine
  • a closed working gas such as air, helium or hydrogen is heated from the outside in a first area, the so-called high-temperature area, and cooled in a second area.
  • the working gas expands in the heated cylinder chamber and contracts again in the cold cylinder, creating usable mechanical work. This kinetic energy can subsequently be converted into electrical energy by an electrical generator.
  • the increasing contamination in particular of the outer surface of the heater head and the inner surface of the inflow unit also means that the speed of the suction fan with which the flue gases are extracted has to be adjusted in order to prevent a deterioration in the thermal performance of the heating device.
  • the inflow unit surrounding the heater head can be formed, for example, by an inner lateral surface of the flame tube, or by a separate structural unit, for example, by the inner lateral surface of a tube arranged in the outflow region of the flame tube, which surrounds the heater head and its inner lateral surface slightly from the outer surface of the heater head is spaced.
  • the flue gases are guided through the annular gap formed between the inner surface of the inflow unit and the lateral surface of the heater head with the aid of a suction device which is arranged approximately downstream in the flue gas duct.
  • the suction speed of this suction must be increased with increasing deposits in the annular gap in order to achieve the optimum for the combustion Ensure pressure conditions in the combustion chamber and the flame tube up to the outflow area.
  • the required increase in the power of the induced draft fan in turn worsens the efficiency of the system.
  • cleaning devices have been proposed, for example in the form of cleaning nozzles, which are directed onto the outer surface of the heater head and / or the inner surface of the inflow unit surrounding the heater head and through which a cleaning fluid (e.g. compressed air) is introduced in order to remove particle deposits.
  • a cleaning fluid e.g. compressed air
  • the cleaning nozzles allow easy cleaning of the heater head and / or the inflow unit, but usually only incomplete cleaning, so that frequent cleaning with short cleaning intervals between the individual cleaning processes is necessary.
  • the cleaning of the heating device from deposits, in particular in the annular gap between the outer surface of the heating head and the inner surface of the inflow unit thus increases the maintenance effort for the heating device.
  • the cleaning fluid must be introduced under pressure, which also causes an energy expenditure that reduces the efficiency of the overall system.
  • the aim of the present invention is therefore to provide a heating device in which an efficient transfer of the heat of combustion of solid fuels to the high-temperature part of a heat engine, such as the heater head of a Stirling engine, is possible.
  • a heat engine such as the heater head of a Stirling engine.
  • the deposition of combustion particles on the flow surfaces, in particular on those components that serve for heat transfer, is to be reduced.
  • this should lead to a more efficient use of the heat of combustion for conversion into mechanical energy and an improved one Efficiency of the system lead, and on the other hand allow a reduction in maintenance.
  • Claim 1 relates to a heating device, in particular a boiler, with a combustion chamber for the combustion of solid fuel, in particular biomass, and a flame tube, the inflow region of which for flue gases released from the combustion faces the combustion chamber and the outflow region of a subsequent outlet region for the discharge of the flue gases
  • a heater head thermally coupled to the high-temperature area of a heat engine for converting thermal energy of a working gas into mechanical energy is arranged in the outflow area, which has a jacket surface that tapers in the direction of the inflow area and an inflow unit that delimits the outflow area and an inner surface that faces the heater head is surrounded, the clear cross section of which widens in the direction of the outlet area, and an annular gap between the outer surface of the heater head and the inner surface of the inflow unit is formed for the escaping flue gases.
  • an adjustment mechanism that changes the relative positioning of the heater head to the inflow unit
  • a control and regulating unit for the adjustment mechanism with which the clear cross section of the annular gap formed between the lateral surface of the heater head and the inner surface of the inflow unit is controllably changeable
  • the control and regulating unit for the adjustment mechanism being switchable from a cleaning mode in which the control and regulation unit controls a predetermined adjustment path of the adjustment mechanism to an operating mode in which the control and regulation unit regulates the adjustment mechanism in a performance-optimized manner.
  • the cleaning of the outer surface of the heater head and the inner surface of the inflow unit is thus achieved according to the invention by moving the heater head relative to the inflow unit.
  • the heater head of the heat engine is firmly mounted in a specific position relative to the inflow unit and, in the assembled state, no more mobility relative to the inflow unit is permitted.
  • the heater head is moved relative to the inflow unit with the aid of an adjustment mechanism and a corresponding control and regulating unit, in order to change the clear cross section of the annular gap formed between the outer surface of the heater head and the inner surface of the inflow unit, in particular also via physical contact of the outer surface of the heater head with the inflow unit.
  • the change in the annular gap cross section causes a change in the flow velocity of the flue gases.
  • Deposits can thus be removed simply and effectively via the movable positioning of the heater head relative to the inflow unit.
  • the mobility of the heater head according to the invention relative to the inflow unit also enables improved operational management of the heating system.
  • the increasing contamination, in particular of the annular gap between the outer surface of the heater head and the inner surface of the Inflow unit that the speed of the induced draft fan with which the flue gases are extracted must be adjusted in order to prevent a deterioration in the thermal performance of the heating device.
  • the suction speed of this suction must be increased with increasing deposits in the annular gap in order to ensure the optimum pressure conditions in the combustion chamber and the flame tube up to the outflow area for combustion.
  • the control and regulating unit for the adjustment mechanism can be switched from a cleaning mode, in which the control and regulation unit controls a predetermined adjustment path of the adjustment mechanism, to an operating mode, in which the control and regulation unit regulates the adjustment mechanism in a performance-optimized manner is.
  • the cleaning mode is taken at predetermined intervals, for example after each suction filling of the combustion chamber, in which the control unit controls a predetermined adjustment path of the adjustment mechanism.
  • This adjustment path can be selected such that, starting from a current positioning of the heater head, the heater head is moved in such a way that there is a minimal distance between the heater head and the inflow unit until the heater head physically contacts the inflow unit. The heater head can then be moved such that a maximum distance between the heater head and the inflow unit is assumed. After the maximum spacing has been reached, the control and regulating unit can be switched back to the operating mode, in which the adjustment mechanism is regulated to optimize performance.
  • Such a performance-optimized control can be achieved, for example, by pressure sensors in the combustion chamber of the heating device measuring the pressure conditions and transmitting this data to the control and regulating unit, which positions the heater head relative to the inflow unit in such a way that the annular gap cross-section assumes a value suitable for optimal operation of the heating device .
  • a preferred embodiment of the adjustment mechanism provides that the adjustment mechanism is designed as a lifting and lowering device that moves the heater head and / or the inflow unit in the axial direction of the flame tube. Due to the tapered surface area of the heater head tapering in the direction of the inflow area and the clear cross section of the inflow unit widening in the direction of the exit area, the clear cross section of the annular gap between the heater head and the inflow unit is changed during a relative axial movement between the heater head and the inflow unit.
  • the heater head is preferably moved in that the lifting and lowering device is fastened to the housing of the heat engine and the heater head is kinematically coupled to the housing.
  • the heater head forms part of the heat engine, which is located outside a housing of the heat engine, in order to be subjected to heat. It guides the heat to the high temperature area of the heat engine, which is located inside the housing. Regardless of the specific design of the attachment of the heater head to the heat engine, it is kinematically coupled to the housing of the heat engine, so that movements of the housing are transmitted directly to the heater head. If the lifting and lowering device is attached to the housing, not only the housing of the heat engine is lifted and lowered, but also the heater head via the kinematic coupling.
  • the lifting and lowering device is preferably arranged on the side facing away from the flame tube of a top surface of the heating device arranged above the flame tube.
  • the lifting and lowering device is thus located in an area of the heating device which is not subject to high temperatures, which facilitates the arrangement and design of the lifting and lowering device.
  • the lifting and lowering device can include an axial guide for the housing of the heat engine, as well as swivel arms actuated by a motor and attached to the housing.
  • the heat engine be arranged in an opening in a top surface of the heating device via an elastic seal, the elasticity of the seal allowing an axial adjustment path of the heater head attached to the heat engine of at least 1 cm.
  • the housing of the heat engine is located above this top surface, and the heater head below the top surface in the outflow area of the flame tube.
  • the elastic seal can in particular be designed as a sealing ring which is arranged in the opening in the cover surface and on which the housing of the heat engine is arranged. Due to the lifting and lowering device, the elastic seal is compressed when the housing is lowered and slightly stretched when it is raised.
  • the adjustment path of the heater head is limited.
  • two contact switches which limit the axial adjustment path of the heater head, are provided, each of which is formed from an immovable contact part and a contact part moving with the housing of the heat engine, an upper unmoving contact part being moved in physical contact with an upper one Contact part defines an uppermost position of the heater head and a lower stationary contact part in physical contact with a lower moving contact part defines a lowest position of the heater head.
  • end positions of the adjustment path can be defined, which can be used in the cleaning mode, for example, within the scope of the predetermined adjustment path.
  • the lowest position of the heater head can be approached first, in which the lower stationary contact part touches the lower moving contact part.
  • the contact made in this way signals the control and regulation unit that the lowest position has been reached.
  • the adjustment mechanism is controlled by the control and regulating unit in such a way that an uppermost position of the heater head is approached, in which the upper stationary contact part touches the upper moved contact part.
  • the contact made in this way signals the control unit that it has reached the top position.
  • the control and regulating unit then switches back to the operating mode, in which a performance-optimized regulation of the positioning of the heater head takes place, for example on the basis of the measured values from pressure sensors in the combustion chamber and / or other sensors.
  • the heater head and the inflow unit are preferably designed such that the inner surface of the inflow unit is frustoconical and the outer surface of the heater head arranged in the outflow region is conical, the inner surface of the inflow unit and the heater head each being arranged coaxially with the flame tube. In the outflow area of the flame tube, which is formed by the inner and outer vicinity of the outlet opening of the flame tube, there is generally a largely laminar flow of the flue gases.
  • the heating device is preferably designed for the combustion of free-flowing fuel, preferably as a pellet boiler or pellet stove, and can be in the form of a boiler, as part of a heating system, central heating and / or buffer storage.
  • a firing plate is arranged in a combustion chamber, to which the solid firing material is supplied, for example in the form of free-flowing or pourable firing material (for example pellets), during the combustion process.
  • the ash collects below the burner plate and is conveyed into the ash container by an ash screw.
  • the combustion chamber has a side opening through which bulk material can be conveyed to the burner plate by means of a conveyor.
  • the conveyor can be an automatically controlled screw conveyor, for example.
  • a flame tube 1 is located above the burner plate (see Fig. 1 ) arranged vertically, the inflow range of which in the Fig. 1 is not visible combustion chamber facing and opens into the combustion chamber.
  • the flame tube 1 is of appropriate thickness and made of a thermally insulating material, preferably ceramic material or (fire) concrete.
  • the flue gases emerge in an approximately laminar flow in an outflow area of the flame tube 1 delimited by an inflow unit 6 and pass through an outlet area into a subsequent flue gas channel via which they are discharged from the heating device.
  • the flame tube 1 and sections of the flue gas duct are surrounded by liquid-filled, in particular water-filled, spaces.
  • the medium to be heated for heating purposes or for use as hot water is located in these rooms.
  • a heater head 3 is arranged in the outflow region of the flame tube 1 and is thermally coupled to the high-temperature region of the heat engine 4, preferably a Stirling engine.
  • the heater head 3 has a lateral surface for the flue gas, which is directed towards the flame tube 1 and which tapers in the direction of the inflow region of the flame tube 1, that is to say against the flow direction of the flue gas. In the illustrated embodiment according to Fig. 1 this lateral surface is conical.
  • the heater head 3 is approximately formed from a solid metal block, preferably a copper block, and fastened to a base section 5 of the heat engine 4. This embodiment is particularly advantageous when the base section 5 is already integrated as standard on the Stirling engine.
  • the outflow area of the flame tube 1 is delimited by the inflow unit 6 with an inner surface facing the heater head 3, the clear cross-section of which widens in the direction of the outlet area for the flue gases, so that an annular gap 2 for the between the outer surface of the heater head 3 and the inner surface of the inflow unit 6 escaping smoke gases is formed.
  • the inner surface of the inflow unit 6 is frustoconical and surrounds the conical heater head 3.
  • the outlet area for the flue gases is delimited in its upper area, that is to say in the axial extension of the flame tube 1, by a cover surface 7.
  • the heat engine 4 is arranged in an opening in the cover surface 7, the housing 8 of the heat engine 4 being located on the side of the cover surface 7 facing away from the flame tube 1.
  • the heater head 3 is located below the top surface 7 in the outflow region of the flame tube 1.
  • the top surface 7 is made of a thermally resistant material.
  • the heat engine 4 is via an elastic seal 9, which in the embodiment of the Fig. 1 and 2 is designed as an elastic silicone sealing ring, arranged in the opening of the top surface 7, the elasticity of the seal 9 allowing an axial adjustment path of the heater head 3 fastened to the heat engine 4 of up to 4 cm.
  • a lifting and lowering device 10 is also arranged, by means of which the heat engine 4 and thus the heater head 3 can be raised and lowered. That way an axial adjustment of the heater head 3 of several centimeters.
  • the elastic seal 9 is compressed when the housing 8 is lowered and slightly stretched when it is raised.
  • the lifting and lowering device 10 comprises a motor 11 with which a threaded spindle 12 can be set in rotation.
  • the threaded spindle 12 is in engagement with a threaded bushing 22 which is mounted on a first swivel arm 13a in a rotationally fixed manner about its threaded axis parallel to the threaded spindle 12, but rotatable about a horizontal axis.
  • the threaded bushing 22 is thus moved axially along the threaded spindle 12 as soon as the threaded spindle 12 is set in rotation by the motor 11, since it is rotatably mounted on the first swivel arm 13a about its threaded axis parallel to the threaded spindle 12, the axial movement of the threaded bushing 22 in one Pivotal movement of the first pivot arm 13a about a shaft 14 is implemented.
  • the mounting of the threaded bushing 22 on the first swivel arm 13a which is rotatable about a horizontal axis, compensates for the swivel angle of the first swivel arm 13a, and the threaded spindle 12 also traverses an elongated opening in the first swivel arm 13a in order to ensure sufficient movement play for the threaded spindle 12 relative to the first swivel arm 13a to care.
  • the pivoting movement of the first pivot arm 13a is transmitted via the shaft 14 to a second pivot arm 13b, which is arranged on an opposite side of the housing 8.
  • the first swivel arm 13a and the second swivel arm 13b carry a suspension 15 which is fastened to an upper region of the housing 8 of the heat engine 4 via rubber buffers 21.
  • a support frame 16 is fastened to a lower region of the housing 8 and is guided via slide bushes 17 in an axial guide 18 formed by vertical guide rods.
  • the support frame 16 ensures with the axial guide 18 an exclusively axial movement - as a rule in the vertical direction - of the heat engine 4, the rubber buffers 21 cushioning movement forces which deviate from the axial direction and are exerted by the pivot arms 13 on the housing 8.
  • two contact switches 19, 20 which limit the axial adjustment path of the heater head, which are each formed from an immovable contact part 19a, 20a and a contact part 19b, 20b which is moved with the second swivel arm 13b and thus the housing 8 of the heat engine 4 , wherein an upper stationary contact part 19a in physical contact with an upper moving contact part 19b defines an uppermost position of the heater head 3 and a lower stationary contact part 20a in physical contact with a lower moving contact part 20b a lowermost position of the heater head 3.
  • the electrical contact thus produced signals the control and regulation unit that the uppermost position has been reached.
  • a further pivoting of the swivel arms 13a, 13b and thus the upward movement of the housing 8 can then be stopped.
  • a further pivoting of the swivel arms 13a, 13b in the opposite direction and thus a downward movement of the housing 8 can be stopped as soon as the lower moving contact part 20b touches the lower stationary contact part 20a.
  • the electrical contact produced in this way signals the control unit that the lowest position has been reached. In this way, it can be reliably excluded that the adjustment path exceeds maximum values.
  • the axial adjustability of the heater head 3 and thus the The adjustability of the annular gap 2 is used to perform a performance-optimized regulation of the positioning of the heating head 3 and thus of the annular gap 2, for example on the basis of the measured values from pressure sensors in the combustion chamber and / or other sensors.
  • the annular gap 2 is regulated in such a way that the thermal output of the heating device and thus the overall efficiency of the system is optimized.
  • the control and regulating unit of the heating device switches into a cleaning mode in which, based on a current positioning of the heater head 3, the heater head 3 is moved such that a minimum distance between the heater head 3 and Inflow unit 6 is taken up to the physical contact of the heater head 3 with the inflow unit 6.
  • This lowest position of the heater head 3 is secured by physical contact of the lower contact switch 20, which reliably prevents further downward movement of the heater head 3 in order to avoid damage. Soot bridges already formed between the inner surface of the inflow unit 6 and the heating head 3 can be destroyed during this downward movement and deposits can be loosened. With physical contact between the heater head 3 and the inner surface of the inflow unit 6, deposits can also be chipped off and scraped off.
  • the heater head 3 is then moved such that a maximum distance between the heater head 3 and the inflow unit 6 is assumed. This uppermost position of the heater head 3 is detected by physical contact of the upper contact switch 19, which stops a further upward movement of the heater head 3. After the maximum spacing has been reached, the control and regulating unit switches back to the operating mode in which the adjustment mechanism is regulated in a performance-optimized manner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Resistance Heating (AREA)
EP18178604.7A 2017-07-04 2018-06-19 Heizeinrichtung Active EP3425274B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL18178604T PL3425274T3 (pl) 2017-07-04 2018-06-19 Urządzenie grzewcze
RS20200489A RS60206B1 (sr) 2017-07-04 2018-06-19 Uredjaj za zagrevanje

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT505472017 2017-07-04

Publications (2)

Publication Number Publication Date
EP3425274A1 EP3425274A1 (de) 2019-01-09
EP3425274B1 true EP3425274B1 (de) 2020-03-04

Family

ID=62712903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18178604.7A Active EP3425274B1 (de) 2017-07-04 2018-06-19 Heizeinrichtung

Country Status (5)

Country Link
EP (1) EP3425274B1 (pl)
DK (1) DK3425274T3 (pl)
ES (1) ES2790579T3 (pl)
PL (1) PL3425274T3 (pl)
RS (1) RS60206B1 (pl)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006001299A1 (de) * 2006-01-11 2007-07-12 Eckhart Weber Holzpellet-Blockheizkraftwerk mit Stirlingmotor in Brennwerttechnik
AT504666B1 (de) * 2007-05-03 2008-07-15 Frauscher Josef Wärmetauscher
AT513734B1 (de) * 2012-12-04 2022-12-15 Oekofen Forschungs Und Entw M B H Heizkessel mit Wärmekraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
RS60206B1 (sr) 2020-06-30
DK3425274T3 (da) 2020-05-25
ES2790579T3 (es) 2020-10-28
EP3425274A1 (de) 2019-01-09
PL3425274T3 (pl) 2020-07-27

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