EP0593606A1 - A microwave heating method and a relative microwave heating device - Google Patents
A microwave heating method and a relative microwave heating deviceInfo
- Publication number
- EP0593606A1 EP0593606A1 EP92914891A EP92914891A EP0593606A1 EP 0593606 A1 EP0593606 A1 EP 0593606A1 EP 92914891 A EP92914891 A EP 92914891A EP 92914891 A EP92914891 A EP 92914891A EP 0593606 A1 EP0593606 A1 EP 0593606A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- container
- microwaves
- dielectric constant
- heated
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/281—Methods of steam generation characterised by form of heating method in boilers heated electrically other than by electrical resistances or electrodes
-
- 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
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/225—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating electrical central heating boilers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/80—Apparatus for specific applications
- H05B6/802—Apparatus for specific applications for heating fluids
Definitions
- a microwave heating method and a relative microwave heating device are provided.
- the present invention relates to microwave heating, and to microwave heating devices. More particularly the invention relates to a method and to a relative device wherein use is made of microwave radiation, and of a microwave absorbing material capable of being heated and of transmitting heat in turn to a fluid with which it is in contact.
- a fluid heated in this manner can be used for space heating, or in the case of hot water, distributed for domestic and industrial consumption; in addition, high pressure steam generated by the method disclosed can be used to operate turbines or pistons.
- microwaves electromagnetic waves in the range of frequencies between 300 and 300,000 megahertz, commonly referred to as microwaves, are capable of inducing a rotational and to an extent vibrational effect in the molecules of materials possessing a high dielectric constant.
- microwave absorbing materials referred to also as dielectrics in the following specification, is that they excite when exposed to radiation and undergo a rise in temperature.
- microwaves are transparent to microwaves; these undergo no rise in temperature when exposed to radiation and are considered good insulators.
- materials which reflect microwave energy without heating and are considered good conductors.
- the different materials mentioned above can be used in conjunction with microwaves for different purposes: transparent materials for inert containers, such as crucibles; reflective materials for the external claddings of microwave systems; and dielectrics as heat sources by virtue of their capacity to excite when invested with microwave radiation.
- the frequencies that can be utilized for microwaves are 915 ⁇ 25, 2450 +13, 5800 ⁇ 75 and 22125 ⁇ 125 MHz. Of these the most widely used is 2450 MHz, enabling as it does a good penetration of materials combined with high surface intensity.
- the object of the present invention is to provide a method and a device such as will bring about heat exchange between a fluid and a source of heat consisting in a microwave absorbing material.
- a further object of the invention is to provide a method and a device whereby microwave energy can be used to produce hot air or hot water as a means of space heating or as a utility for domestic and/or industrial use.
- Yet another object of the invention is to provide a method and a device whereby microwave energy can be used to generate high pressure steam for operating turbines or pistons.
- -fig 2 is a further front perspective view showing a device according to the invention suitable for producing hot water
- -fig 3 is a further front perspective view showing a device according to the invention suitable for producing hot water or generating high pressure steam.
- Fig 1 illustrates a microwave device for producing hot air.
- the device comprises a microwave generator unit 1 consisting essentially in a magnetron 10 rated 700 W - 10 kW, operated off 220/380 V a.c. and producing frequencies of 2455 MHz and 915 MHz, a waveguide 11 and a waveguide resonator 12, which combine to direct a flow of microwaves, denoted by the arrows, onto a plurality of silicon carbide or boron carbide plates 20.
- the plates 20 in question are spaced apart one from another and mounted on a support 21 fashioned in a material capable of refracting microwaves, such as quartz, internally of a container 2 constructed in material capable of reflecting microwaves, such as steel.
- the container 2 of substantially parallelepiped embodiment, is associated both with the microwave generator unit 1 and with means by which to effect a forced induction of air, consisting for example in a fan unit 30 and a duct 31.
- the plates 20 undergo a rise in temperature and give off heat into the air to which they are directly exposed; the air is then expelled from the container 2 at a temperature of between 60 and 100 °C or higher, by way of suitable vents 22 fitted with grilles 23, in such a way as to warm the surrounding ambient.
- the device thus described can be embodied adopting compact dimensions, for example a few decimetres per side, which will be variable according to the quantity of hot air it is wished to produce.
- the plates 20 these would be fashioned from materials combining advantages of economy (i.e. low cost) with good heat dissipation; boron carbide is preferred by virtue of its greater resistance to oxidation at high temperature and its ability to heat at a faster rate.
- FIG. 1 shows a microwave device for producing hot water.
- microwaves emitted by a generator unit l 1 are directed at a dielectric, in this instance a coiled tube 24 fashioned from or faced externally with a microwave absorbing material.
- the coil 24 is housed internally of a container 2' of microwave reflecting material, and connected to a heating circuit or to a hot water distribution system. More exactly, the coil 24 is fashioned from tube of 10-15 mm diameter, some 20-30 cm in length, in a material selected from carbides of silicon, boron, titanium or tungsten, or borides of silicon, titanium or aluminium, etc., which might be pure or combined with nitrides of the same elements; the option also exists of using ferroelectric ceramics containing titanates of barium or lead or other metallic elements (zinc, manganese, copper, etc.). To advantage, the coil 24 is coated with a material transparent to microwaves such as will give greater mechanical strength and more readily dissipate excess temperature.
- Fig 3 illustrates a microwave device for producing hot water or generating steam at high temperature and high pressure.
- microwaves emitted by a generator unit 1" are directed onto a plurality of plates 25 fashioned from material able to absorb high frequency radiations and housed in a first container 26 embodied in material transparent to microwaves.
- Water directed through an inlet 28 into the first container 26 is heated rapidly on making contact with the plates 25 exposed to microwave radiation, and directed through an outlet 29 into the heating circuit or the hot water distribution system.
- This type of device is capable of discharging water or water vapour at temperatures between 60 and 80 °C, according to the quantity of water introduced and to the number of plates installed.
- the plates 25 might be between 10 and 25 in number, spaced apart 5...10 mm one from the next, and with typical dimensions of 30 x 15 x 1 cm.
- the plates 25 will be of boron nitride, exhibiting a honeycomb structure and immersed three quarters in deionized water.
- the first container 26 might be embodied in boron carbide or nitride reinforced with steel or other materials able to withstand high pressures.
- steam can be generated at pressures of 30 to 40 bar and temperatures of the order of 230 to 350 °C, in approximately one third of the time taken where use is made of materials unable to absorb high frequency radiations. Steam generated in this way can be used to advantage in driving turbines, for example, with at least a part of the heat being recovered by means of exchangers.
- the device of fig 3 is again compact, measuring substantially less than one metre on any side, the dimensions of the first container 26 being, by way of example, 30 x 15 x 40 cm.
- the magnetron 10 might be set at a certain distance from the container 2, and the microwaves directed into the container through a waveguide of suitable length.
- the microwave generator unit 1 or 1* or 1" is detached from the relative container 2 or 2' or 2", rather than attached as shown in the drawings.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Compositions Of Oxide Ceramics (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO91022 | 1991-06-21 | ||
IT91BO000224A ITBO910224A1 (it) | 1991-06-21 | 1991-06-21 | Impianti di riscaldamento domestico ed industriale ad aria, acqua e vapore basati sull'effetto termico delle microonde su materiali |
PCT/IT1992/000065 WO1993000781A1 (en) | 1991-06-21 | 1992-06-19 | A microwave heating method and a relative microwave heating device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0593606A1 true EP0593606A1 (en) | 1994-04-27 |
Family
ID=11337610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92914891A Withdrawn EP0593606A1 (en) | 1991-06-21 | 1992-06-19 | A microwave heating method and a relative microwave heating device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0593606A1 (ja) |
JP (1) | JPH06511547A (ja) |
AU (1) | AU2263292A (ja) |
IT (1) | ITBO910224A1 (ja) |
WO (1) | WO1993000781A1 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06231880A (ja) * | 1993-02-02 | 1994-08-19 | Nara Seiki Kk | マイクロ波利用の加熱装置 |
EP0849546A1 (en) * | 1996-12-20 | 1998-06-24 | Andreino Gatti | High safety and reduced maintenance water heater |
GB2342833A (en) * | 1998-10-13 | 2000-04-19 | Gary Hopkins | Microwave energy indirect central heating and water boiler |
JP3761176B2 (ja) * | 2003-03-13 | 2006-03-29 | 松下電器産業株式会社 | 蒸気発生機能付き高周波加熱装置 |
US7022953B2 (en) * | 2004-06-03 | 2006-04-04 | Fyne Industries, L.L.C. | Electromagnetic flowing fluid heater |
GB2427112B (en) * | 2005-05-09 | 2009-04-08 | Rowland Simpkins | Microwave boiler |
GB0511702D0 (en) * | 2005-06-09 | 2005-07-13 | Microwave Energy Converters Lt | Heating apparatus and method |
EP2239995A1 (fr) | 2009-04-07 | 2010-10-13 | Christian Zignani | Dispositif de chauffage d'un fluide pour un usage domestique, industriel ou de chauffage de locaux, utilisant les micro-ondes en tant que source d'énergie |
WO2011146093A2 (en) * | 2009-12-15 | 2011-11-24 | William Marsh Rice University | Electricity generation |
US9222665B2 (en) | 2010-12-15 | 2015-12-29 | William Marsh Rice University | Waste remediation |
US9032731B2 (en) | 2010-12-15 | 2015-05-19 | William Marsh Rice University | Cooling systems and hybrid A/C systems using an electromagnetic radiation-absorbing complex |
US9863662B2 (en) | 2010-12-15 | 2018-01-09 | William Marsh Rice University | Generating a heated fluid using an electromagnetic radiation-absorbing complex |
CN113250669A (zh) * | 2020-02-11 | 2021-08-13 | 中国石油天然气股份有限公司 | 一种火驱注入管柱 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2549996A1 (de) * | 1975-11-07 | 1977-05-18 | Clinton | Fluiderhitzer fuer dielektrische fluide |
FR2521809A1 (fr) * | 1982-02-12 | 1983-08-19 | Munoz Michel | Chaudiere a micro-ondes pour la production d'un fluide chaud a usage domestique, industriel ou de chauffage de locaux, et procede mis en oeuvre par cette chaudiere |
DE3342252A1 (de) * | 1983-11-23 | 1985-05-30 | Manfred Josef 5000 Köln Rinn | Geraet zur herstellung von dampf und warmen und heissen fluessigkeiten auf elektrischem wege |
-
1991
- 1991-06-21 IT IT91BO000224A patent/ITBO910224A1/it not_active Application Discontinuation
-
1992
- 1992-06-19 JP JP5501417A patent/JPH06511547A/ja active Pending
- 1992-06-19 EP EP92914891A patent/EP0593606A1/en not_active Withdrawn
- 1992-06-19 AU AU22632/92A patent/AU2263292A/en not_active Abandoned
- 1992-06-19 WO PCT/IT1992/000065 patent/WO1993000781A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9300781A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH06511547A (ja) | 1994-12-22 |
ITBO910224A0 (it) | 1991-06-21 |
AU2263292A (en) | 1993-01-25 |
ITBO910224A1 (it) | 1992-12-21 |
WO1993000781A1 (en) | 1993-01-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19931230 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT NL |
|
17Q | First examination report despatched |
Effective date: 19940706 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19950127 |