GB2052027A - A Microwave Heat Exchange System - Google Patents

A Microwave Heat Exchange System Download PDF

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Publication number
GB2052027A
GB2052027A GB8016222A GB8016222A GB2052027A GB 2052027 A GB2052027 A GB 2052027A GB 8016222 A GB8016222 A GB 8016222A GB 8016222 A GB8016222 A GB 8016222A GB 2052027 A GB2052027 A GB 2052027A
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United Kingdom
Prior art keywords
liquid
heat exchange
exchange system
heated
magnetron
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GB8016222A
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Individual
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Individual
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Priority to GB8016222A priority Critical patent/GB2052027A/en
Publication of GB2052027A publication Critical patent/GB2052027A/en
Withdrawn legal-status Critical Current

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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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • 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
    • F24D13/00—Electric heating systems

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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)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

A heat exchange system 2 comprising microwave apparatus 4 for heating a liquid in the system and at least one heat exchanger 14, the system being a closed system in which the liquid is retained in the system and is reheated by the microwave apparatus after it has given up heat in the heat exchanger. <IMAGE>

Description

SPECIFICATION A Microwave Heat Exchange System This invention relates to a microwave heat exchange system.
Microwave ovens for heating food are well known. The food stays in the oven until it is heated and, in contrast, the present invention is baded on the realisation that a liquid can be heated whilst being continuously passed through the oven. The present invention is then based on the further realisation that if the heated liquid is kept in a closed system, then the liquid can be passed through a heat exchanger and the heat exchanger can be used to heat gases or liquids as desired.
Accordingly, this invention provides a heat exchange system comprising microwave apparatus for heating a liquid in the system and at least one heat exchanger, the system being a closed system in which the liquid is retained in the system and is reheated by the microwave apparatus after it has given up heat in the heat exchanger.
The microwave apparatus may be a magnetron or other device for generating the required electromagnetic energy in the microwave frequency spectrum. The magnetron may be a radio frequency osciliator requiring only high and low tension supplies in order to provide a microwave output. The magnetron may be a slottype magnetron, a hole-and-slot-type magnetron, a rising sun anode block-type magnetron or a vane-type magnetron. A presently preferred magnetron is the vane-type magnetron and this may consist of a cylindrical anode block separated by an interaction space from a heated axial cathode. Such a vane-type magnetron may be a metal-ceramic continuous wave magnetron.
The amount of heat produced by the microwave apparatus depends largely on the type of liquid to be heated. However, it is envisaged that the liquid will be heated more quickly and economically than more conventional liquidheating sources such as a naked gas flame.
The part of the heat exchange system of the invention embodying the microwave apparatus should advantageously include materials that are transparent to microwaves and that therefore do not generate heat when exposed to the microwaves. Metals are generally unsuitable since they absorb the microwaves and cause heat to be generated by molecular friction. Examples of suitable materials that are transparent to microwaves are Pyrex (Registered Trade Mark) and similar glassy materials, china and polypropylene.
The liquid to be heated will absorb the microwaves and will thus be heated. The heat will tend to be generated within the liquid rather than at its surface, so that the liquid can be brought to its required temperature far more quickly than by using conventional liquid heating sources where much heat is lost to the environment. By using appropriate materials for the microwave apparatus, a very high proportion of the power required by the microwave apparatus will be employed solely to heat the liquid.
The microwave apparatus may need to be cooled in operation and this can advantageously be effected using the liquid to be heated. In order to protect the microwave apparatus from overheating a thermostat can be incorporated into the heat exchange system.
Because the heat exchange system of the present invention is a closed system, unwanted loss of microwaves can be kept to a minimum.
The heat exchanger may comprise a plurality of conduits for receiving the heated liquid. The heat exchange system of the invention can 'advantageously be used for providing central heating, in which case the heat exchanger will be a radiator and the liquid to be heated may be water. Other types of liquid and other types of heat exchanger can obviously be employed if desired. The liquid may be a chemical or an industrial liquid. It is envisaged that the present invention may be especially useful in industry where there is often a need for heating various types of chemicals and liquids quickly and evenly.
In the case of a radiator, the external gas to be heated will be air in a room. Other gases and various liquids can be the external fluid to be heated.
The heat exchange system may include a pump for circulating the liquid through the system, and it may also include a timing device for controlling the operational periods of the heat exchange system.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawing.
Referring to the drawing, there is shown a heat exchange system 2 for heating a house. The system 2 comprises a magnetron microwave apparatus 4 for supplying microwaves through a Pyrex window 6 into water 8 in a chamber 10.
The heated water 8 is pumped by a pump 12 around the system 2 and through a radiator 14. In the radiator 14, the heated water 8 gives up its heat so that, if the radiator 14 is placed in a room, the air in the room becomes heated.
It is to be appreciated that the embodiment of the invention described above with reference to the drawing has been given by way of example only and that modifications may be effected.
Thus, for example, more radiators 14 could be employed or another external gas or an external liquid could be brought into contact with the radiator 14 for being heated. Further, appropriate thermostats and timing devices for controlling the operation of the system 2 may be employed if desired.
Claims
1. A heat exchange system comprising microwave apparatus for heating a liquid in the system and at least one heat exchanger, the system being a closed system in which the liquid is retained in the system and is reheated by the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (14)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A Microwave Heat Exchange System This invention relates to a microwave heat exchange system. Microwave ovens for heating food are well known. The food stays in the oven until it is heated and, in contrast, the present invention is baded on the realisation that a liquid can be heated whilst being continuously passed through the oven. The present invention is then based on the further realisation that if the heated liquid is kept in a closed system, then the liquid can be passed through a heat exchanger and the heat exchanger can be used to heat gases or liquids as desired. Accordingly, this invention provides a heat exchange system comprising microwave apparatus for heating a liquid in the system and at least one heat exchanger, the system being a closed system in which the liquid is retained in the system and is reheated by the microwave apparatus after it has given up heat in the heat exchanger. The microwave apparatus may be a magnetron or other device for generating the required electromagnetic energy in the microwave frequency spectrum. The magnetron may be a radio frequency osciliator requiring only high and low tension supplies in order to provide a microwave output. The magnetron may be a slottype magnetron, a hole-and-slot-type magnetron, a rising sun anode block-type magnetron or a vane-type magnetron. A presently preferred magnetron is the vane-type magnetron and this may consist of a cylindrical anode block separated by an interaction space from a heated axial cathode. Such a vane-type magnetron may be a metal-ceramic continuous wave magnetron. The amount of heat produced by the microwave apparatus depends largely on the type of liquid to be heated. However, it is envisaged that the liquid will be heated more quickly and economically than more conventional liquidheating sources such as a naked gas flame. The part of the heat exchange system of the invention embodying the microwave apparatus should advantageously include materials that are transparent to microwaves and that therefore do not generate heat when exposed to the microwaves. Metals are generally unsuitable since they absorb the microwaves and cause heat to be generated by molecular friction. Examples of suitable materials that are transparent to microwaves are Pyrex (Registered Trade Mark) and similar glassy materials, china and polypropylene. The liquid to be heated will absorb the microwaves and will thus be heated. The heat will tend to be generated within the liquid rather than at its surface, so that the liquid can be brought to its required temperature far more quickly than by using conventional liquid heating sources where much heat is lost to the environment. By using appropriate materials for the microwave apparatus, a very high proportion of the power required by the microwave apparatus will be employed solely to heat the liquid. The microwave apparatus may need to be cooled in operation and this can advantageously be effected using the liquid to be heated. In order to protect the microwave apparatus from overheating a thermostat can be incorporated into the heat exchange system. Because the heat exchange system of the present invention is a closed system, unwanted loss of microwaves can be kept to a minimum. The heat exchanger may comprise a plurality of conduits for receiving the heated liquid. The heat exchange system of the invention can 'advantageously be used for providing central heating, in which case the heat exchanger will be a radiator and the liquid to be heated may be water. Other types of liquid and other types of heat exchanger can obviously be employed if desired. The liquid may be a chemical or an industrial liquid. It is envisaged that the present invention may be especially useful in industry where there is often a need for heating various types of chemicals and liquids quickly and evenly. In the case of a radiator, the external gas to be heated will be air in a room. Other gases and various liquids can be the external fluid to be heated. The heat exchange system may include a pump for circulating the liquid through the system, and it may also include a timing device for controlling the operational periods of the heat exchange system. An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawing. Referring to the drawing, there is shown a heat exchange system 2 for heating a house. The system 2 comprises a magnetron microwave apparatus 4 for supplying microwaves through a Pyrex window 6 into water 8 in a chamber 10. The heated water 8 is pumped by a pump 12 around the system 2 and through a radiator 14. In the radiator 14, the heated water 8 gives up its heat so that, if the radiator 14 is placed in a room, the air in the room becomes heated. It is to be appreciated that the embodiment of the invention described above with reference to the drawing has been given by way of example only and that modifications may be effected. Thus, for example, more radiators 14 could be employed or another external gas or an external liquid could be brought into contact with the radiator 14 for being heated. Further, appropriate thermostats and timing devices for controlling the operation of the system 2 may be employed if desired. Claims
1. A heat exchange system comprising microwave apparatus for heating a liquid in the system and at least one heat exchanger, the system being a closed system in which the liquid is retained in the system and is reheated by the microwave apparatus after it has given up heat in the heat exchanger.
2. A heat exchange system according to claim 1 in which the microwave apparatus is a magnetron.
3. A heat exchange system according to claim 2 in which the magnetron is a radio frequency oscillator requiring only high and low tension supplies in order to provide a microwave output.
4. A heat exchange system according to claim 2 in which the magnetron is a slot-type magnetron, a hole-and-slot-type magnetron, a rising sun anode block-type magnetron or a vanetype magnetron.
5. A heat exchange system according to claim 4 in which the magnetron is a vane-type magnetron having a cylindrical anode block separated by an interaction space from a heated axial cathode.
6. A heat exchange system according to claim 5 in which the vane-type magnetron is a metalceramic continuous wave magnetron.
7. A heat exchange system according to any one of the preceding claims, in which the part of the heat exchanger embodying the microwave apparatus includes materials that are transparent to microwaves and that therefore do not generate heat when exposed to microwaves.
8. A heat exchange system according to any one of the preceding claims in which the microwave apparatus is adapted to be cooled in operation.
9. A heat exchange system according to any one of the preceding claims including a thermostat for preventing the microwave apparatus from overheating.
10. A heat exchange system according to any one of the preceding claims and including a plurality of conduits for receiving the heated liquid.
11. A heat exchange system according to claim 10 and which is used for providing central heating, the heat exchanger being a radiator, and the liquid to be heated being water.
12. A heat exchange system according to claim 10 which is used for heating chemicals br industrial liquids.
1 3. A heat exchange system according to any one of the preceding claims including a pump for circulating the liquid through the system.
14. A heat exchange system according to any one of the preceding claims including a timing device for controlling the operational periods of the heat exchange system.
1 5. A heat exchange system substantially as herein described with reference to the accompanying drawing.
GB8016222A 1979-05-23 1980-05-16 A Microwave Heat Exchange System Withdrawn GB2052027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8016222A GB2052027A (en) 1979-05-23 1980-05-16 A Microwave Heat Exchange System

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7917891 1979-05-23
GB8016222A GB2052027A (en) 1979-05-23 1980-05-16 A Microwave Heat Exchange System

Publications (1)

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GB2052027A true GB2052027A (en) 1981-01-21

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GB8016222A Withdrawn GB2052027A (en) 1979-05-23 1980-05-16 A Microwave Heat Exchange System

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213918A (en) * 1987-10-17 1989-08-23 Terence John Alabaster Microwave fluid heater
GB2248681A (en) * 1990-10-05 1992-04-15 Alan Keith Baker Microwave space and water heating system
GB2254406A (en) * 1991-02-19 1992-10-07 Ali Askar Shirazi Microwave water heating system
ES2056738A2 (en) * 1993-02-18 1994-10-01 Sanvicente Carlos Romanillos Heating system for liquids for industrial and/or domestic use
EP1344993A2 (en) * 2002-03-15 2003-09-17 Paolo Acquadro Device for heating fluids
NL1027528C2 (en) * 2004-11-16 2006-05-17 Leonardus Martinus Bar Hermans Heat conversion device comprises conducting arrangement for heat conveying medium, heat exchanger for emission of heat through heat carrying medium with high temperature to heating medium with lower temperature
US7926274B2 (en) 2007-06-08 2011-04-19 FSTP Patent Holding Co., LLC Rankine engine with efficient heat exchange system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213918A (en) * 1987-10-17 1989-08-23 Terence John Alabaster Microwave fluid heater
GB2248681A (en) * 1990-10-05 1992-04-15 Alan Keith Baker Microwave space and water heating system
GB2248681B (en) * 1990-10-05 1994-10-26 Alan Keith Baker Microwave space heating system
GB2254406A (en) * 1991-02-19 1992-10-07 Ali Askar Shirazi Microwave water heating system
ES2056738A2 (en) * 1993-02-18 1994-10-01 Sanvicente Carlos Romanillos Heating system for liquids for industrial and/or domestic use
EP1344993A2 (en) * 2002-03-15 2003-09-17 Paolo Acquadro Device for heating fluids
EP1344993A3 (en) * 2002-03-15 2003-12-17 Paolo Acquadro Device for heating fluids
NL1027528C2 (en) * 2004-11-16 2006-05-17 Leonardus Martinus Bar Hermans Heat conversion device comprises conducting arrangement for heat conveying medium, heat exchanger for emission of heat through heat carrying medium with high temperature to heating medium with lower temperature
US7926274B2 (en) 2007-06-08 2011-04-19 FSTP Patent Holding Co., LLC Rankine engine with efficient heat exchange system

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