CA1262083A - Gas-fired water heaters - Google Patents
Gas-fired water heatersInfo
- Publication number
- CA1262083A CA1262083A CA000493537A CA493537A CA1262083A CA 1262083 A CA1262083 A CA 1262083A CA 000493537 A CA000493537 A CA 000493537A CA 493537 A CA493537 A CA 493537A CA 1262083 A CA1262083 A CA 1262083A
- Authority
- CA
- Canada
- Prior art keywords
- water
- reservoir
- gas
- casing
- compact
- 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.)
- Expired
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
- 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
- F24H1/107—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 fluid fuel
Abstract
ABSTRACT
A compact gas-fired water heater in which a reservoir of bulk water is heated, indirectly by a gas burner-fired immersion tube, and directly by mutual contact between the hot flue gases from the immersion tube outlet and feed water droplets as they pass each other in contra-flow through the apertures in a plurality of plates and through a packed bed of graded solid particles or Raschig rings. The packed bed may also include suitable chemicals for modifying the quality of the stored water. One or more calorifiers may be located in the reservoir with limited direct heat conduction contact with the immersion tube.
A compact gas-fired water heater in which a reservoir of bulk water is heated, indirectly by a gas burner-fired immersion tube, and directly by mutual contact between the hot flue gases from the immersion tube outlet and feed water droplets as they pass each other in contra-flow through the apertures in a plurality of plates and through a packed bed of graded solid particles or Raschig rings. The packed bed may also include suitable chemicals for modifying the quality of the stored water. One or more calorifiers may be located in the reservoir with limited direct heat conduction contact with the immersion tube.
Description
~2~20~33 Improvements in Gas-fired Water Heaters This invention relates to gas-fired water heaters, and more particularly to such water heaters of the kind in which heat exchange takes place by direct contact of the combustion product gases from a gas burner with the Eeed water.
In Canadian Patent No. 1,225,886, Baker et al., issued August 25, 1987, and assigned to British Gas Corporation, there is described and claimed a compact gas-flred water heater comprising a casing defining a reservoir for collecting water supplied as streams by a water distribution means located above the reservolr, an inlet for feed water to the water distribution means, a heat exchanger located within the reservoir to receive hot product gases of combustion from a gas burner for heat exchange with the water in the reservolr, outlet means from the heat exchanger for discharging the gases towards the water distribution means, heat transfer means located between the reservoir and the water distribution means for providig heat transfer between the gases and the water issuing from the water distribution means, and an exhaust gas outlet located above the water distribution means.
In order to still further improve the efficiency oE such a water heater and in accordance with the present invent:Lon, in a compact gas-fired water heater of the kind claimed in said Canadian Patent No. 1,225,886, the heat transfer means is provided by saturator means located between the water distribution means and the reservoir, . .~.,,.~.
'~
i ~2~ 83 the saturator means having a geometry which minimises the pressure drop of the hot product gases therethrough but which has a high wettable surface area for maximum exchange of heat from the gases to the feed water passing thereover.
According to the present invention, therefore, there is provided an improvement in a compact, gas-fired water heater which comprises a casing that defines a reservoir Eor collecting water; a water inlet pipe connected to said casing to supply cold water to said reservoir;
a water outlet pipe connected to said casing to remove heated water from said reservoir; a heat exchanger means located within said casing which extends upwardly through said reservoir to an outlet opening above said reservoir; a gas burner for supplying heated combustion gases to the interior of said heat exchanger means; a deflection canopy located within said casing and above the outlet opening of said heat exchanger means; a distribution means located in said casing above both said reservoir and said deflection canopy for providing a plurality of downwardly falling streams of water;
water supply means for supplying water to said distribution means;
a heat transfer means located in said casing below said distribution means and above both said reservoir and said deflection canopy; and an exhaust gas outlet means located above said water dlstr:Lbution means; the improvement being that said heat transfer means comprises a generally pan-shaped metal contalner having a perforated base and conta:Lning a plurality of solid materials in the form oE a packed bed, said solid materials including inert materials and an anion exchange resl.n; and wherein said water heater includes a calorifier , ~ ' "". , " "
"'' ~L262~33 - 2a -for heating a stream of water passing therethrough, said calorifier comprising a first tube portion which extends through said casing and into said reservoir, a second tube portion which is connected to said first tube portion and is coiled around said heat exchanger means, and a third tube portion which is connected to said second tube portion and extends through said casing and out of said reservoir.
The saturator means may consist of a packed bed of suitably shaped material, for example, graded solid particle9 or Raschig rings.
The material would be inert in this environment, for e~ample, stainless steel, glass or aggregate, and could conveniently be packed into a contalner having a perforate base plate through which the feed water will pass.
In order to modify the quality of the water being drawn off from the reservoir, suitable che~icals ~ay be added to or mixed with said inert saturator means, which chemlcals, among other desirable functions, would reduce the nitrate and nitrite levels in the water.
Chemicals such as anion exchange resins would be suitable.
As an alternative to including the chemlcals in the saturator means, a separate removable and renewable pack oE chemlcals may be located between the water distributlon means and the reservoir.
Conveniently, the water heater in accordance with the lnvention may include calorlElers for provlding some space or other heatlng by extracting some heat from the stored hot water in the re~ervolr and possibly augmented by heat transferred by direct, but pre2erably ., ... ~, limited, heat conduction path contact between the calorifiers and the heat exchanger which receives the hot product gases of combustion from the gas burner. This limited heat conduction path can, for example, be achieved by the number and area of metallic joints between the heat exchanger and the calorifiers whlch may be in the form of coiled tubes dlsposed about a tubular combustion chamber constituting said heat exchanger.
The flow of hot product gases from the burner to the exhaust outlet may be by natural draught or may be assisted by a fan. The fan 10 may be located at the combustion air inlet to the burner or alternatively at the exhaust gas outlet.
By way of example, an embodiment of the invention ~ill now be further described with reference to the accompanying diagrammatic drawing which is a vertical sectional elevation not to scale.
Referring to the drawing, the water heater shown is designed for domestic heating to provide hot water for domestic purposes, for example, washing and for space heating. The heater comprises an outer casing 1 having a main cold water feed inlet 2 arranged to replenish any water drawn off from a hot water outlet 3 from the reservoir of 20 water 4 contained within the casing. Within the upper part of the casing is mounted a water distribution plate 5 to which water from the reservoir 4 is fed by recirculation through a pipe 6 by a pump 7.
Beneath the plate 5 is supported a heat transfer means in the form of a ~ 4 ~ ~ 2 ~ 2 ~ 3 saturator unit 8. Pro~ecting vertically upwards from the bottom of the casing i9 an immersion tube heat exchanger 9 in the form of a combustion chamber having an outlet 11 for the passage of hot product gases of combustion from a fan assisted premixed gas burner 12 mounted on the ou~side of the casing 1 and arranged to fire into the immer3ion tubs 9. The tube 9 may be provided with baffles 13 for extracting heat from the hot product gases flowing over them. A canopy deflector 14 is fitted over the immersion tube outlet 11 and a demister pad 15 is provided in an exhaust product gas outlet 16 at the top of the heater 10 so as to remove any entrained water particles from the exhaust gases.
A calorifier 17 in the form of a coiled tube located in the reservoir 4 and around the immersion tube 9 provides hot water for space heating.
A further calorifier 18 similarly located in the form of a spirally coiled tube conveniently fed with mains pressurised or locally pumped 15 water provides hot water, e.g., for a shower bath.
The water distribution plate 5 is in the form of a shallow metal tray having numerous substantially equispaced apertu~es 19 each of which is formed wi~h an upstanding rim. In this way recirculated feed water from the pipe 6 will collect in the troughs around the rimmed 20 apertures 19 and eventually 5pill over the rims in weir-like manner through the apertures to produce an evenly distributed flow of water droplets into the saturator unit 8.
The saturator unlt 8 conaists of a metal contalner 21 with a perforate base 22 filled with a packed bed of graded solid particles or .
126;~ 33 Raschig rings 23 formed from, for example, stainless steel, glass, aggregate or any suitable heat and corrosion resistant ~aterial over and through which the feed water from the distribution plste 5 passes.
Where it is desired to reduce the nitrate and nitrite levels of the water being drawn off from the reservoir 4 suitable chemicals may be added to or mixed with the bed of particles 23. Chemicals such an anion exchange resins would be suitable, for example,'Amberlite' IRA
410 (Registered Trade Mark) which is made up of a cross-linked polystyrene-divinylbenzene matrix incorporating a strongly basic active 10 group, e.g., quaternary ammonium salt (R4N~Cl-~ in the form of a chloride and in which R is an alkyl group.
The numbers and size of the apertures and perforatlons in the plate 5 and container base 22 and the geometrical shape of the bed of solid particles or Raschig rings 23 will depend on a number of factors 15 involving heater capacity, water flow rate, burner ~low rate, wettable surface areas, product gas pressure and required efficiency.
In operation of the water heater, the premixed gas burner 12 fires hot co~bu~tion product gases into the immersion tube heat exchanger 9 which is designed indirectly to exchange a substantial part 20 of the available heat from the burner's hot combustion product gases to the surrounding water reservoir ~. The gases will leave the ~ube 9 through the outlet 11 at a relative low temperature of between 100 150C. The canopy 14 shields the outlet from falling water and may assist in the upward distributlon of product gases.
I
~ - 6 - ~2~83 These hot gases then travel upwa~dly impinging upon, and passing through the apertures ln the perforate base 22, over the Raschig rings 23, and through the distribution plate 5 so as to be in dlrect heat exchange contact wlth the streams of water droplets flowing ln a counter flow direction. By the time the product gases reach the top of the heater, most of the available heat has been removed and the product gases leave the flue outlet 16 at a few degrees centigrade above the feed water inlet temperature.
A water heater in accordance with the invention havlng a compact 10 saturator unit as aforesaid has the advantage of providing a high wettable surface area, in the minlmum of space, for the maximum exchange of heat from the hot gases to the feed water passing over the closely packed saturator materlals and with a minimal pressure drop of the hot gases. With thls arrangement, the slze of the middle heat 15 transfer section of the heater described in the aforementioned Canadian Patent No. 1,225,886 is considerably reduced. This enables the presently invented heater to employ a larger capacity reservoir of hot water and associated calorifiers without necessarily increasing the overall size of the heater.
In a test of a typical gas-fired water heater in accordance with that described and shown with reference to the drawing, the performance data was as follows:-. .
e ~ . i , .
~ 7 ~ ~ ~62~83 Rated Input Gas 7.9kW
Feed Water Inlet 47C
Feed Water Flow Rate 250 litres/hour Flue e~haust gas temperature 49C
This corresponds to an overall heater efPiciency in excess of 91%
based on the gross calorific value of the fuel gas. The overall efficiency oP a heater in accordance with the invention i8 only marginally reduced a~ the water outlet temperature is raised.
. , .
-"
~. .
,:
In Canadian Patent No. 1,225,886, Baker et al., issued August 25, 1987, and assigned to British Gas Corporation, there is described and claimed a compact gas-flred water heater comprising a casing defining a reservoir for collecting water supplied as streams by a water distribution means located above the reservolr, an inlet for feed water to the water distribution means, a heat exchanger located within the reservoir to receive hot product gases of combustion from a gas burner for heat exchange with the water in the reservolr, outlet means from the heat exchanger for discharging the gases towards the water distribution means, heat transfer means located between the reservoir and the water distribution means for providig heat transfer between the gases and the water issuing from the water distribution means, and an exhaust gas outlet located above the water distribution means.
In order to still further improve the efficiency oE such a water heater and in accordance with the present invent:Lon, in a compact gas-fired water heater of the kind claimed in said Canadian Patent No. 1,225,886, the heat transfer means is provided by saturator means located between the water distribution means and the reservoir, . .~.,,.~.
'~
i ~2~ 83 the saturator means having a geometry which minimises the pressure drop of the hot product gases therethrough but which has a high wettable surface area for maximum exchange of heat from the gases to the feed water passing thereover.
According to the present invention, therefore, there is provided an improvement in a compact, gas-fired water heater which comprises a casing that defines a reservoir Eor collecting water; a water inlet pipe connected to said casing to supply cold water to said reservoir;
a water outlet pipe connected to said casing to remove heated water from said reservoir; a heat exchanger means located within said casing which extends upwardly through said reservoir to an outlet opening above said reservoir; a gas burner for supplying heated combustion gases to the interior of said heat exchanger means; a deflection canopy located within said casing and above the outlet opening of said heat exchanger means; a distribution means located in said casing above both said reservoir and said deflection canopy for providing a plurality of downwardly falling streams of water;
water supply means for supplying water to said distribution means;
a heat transfer means located in said casing below said distribution means and above both said reservoir and said deflection canopy; and an exhaust gas outlet means located above said water dlstr:Lbution means; the improvement being that said heat transfer means comprises a generally pan-shaped metal contalner having a perforated base and conta:Lning a plurality of solid materials in the form oE a packed bed, said solid materials including inert materials and an anion exchange resl.n; and wherein said water heater includes a calorifier , ~ ' "". , " "
"'' ~L262~33 - 2a -for heating a stream of water passing therethrough, said calorifier comprising a first tube portion which extends through said casing and into said reservoir, a second tube portion which is connected to said first tube portion and is coiled around said heat exchanger means, and a third tube portion which is connected to said second tube portion and extends through said casing and out of said reservoir.
The saturator means may consist of a packed bed of suitably shaped material, for example, graded solid particle9 or Raschig rings.
The material would be inert in this environment, for e~ample, stainless steel, glass or aggregate, and could conveniently be packed into a contalner having a perforate base plate through which the feed water will pass.
In order to modify the quality of the water being drawn off from the reservoir, suitable che~icals ~ay be added to or mixed with said inert saturator means, which chemlcals, among other desirable functions, would reduce the nitrate and nitrite levels in the water.
Chemicals such as anion exchange resins would be suitable.
As an alternative to including the chemlcals in the saturator means, a separate removable and renewable pack oE chemlcals may be located between the water distributlon means and the reservoir.
Conveniently, the water heater in accordance with the lnvention may include calorlElers for provlding some space or other heatlng by extracting some heat from the stored hot water in the re~ervolr and possibly augmented by heat transferred by direct, but pre2erably ., ... ~, limited, heat conduction path contact between the calorifiers and the heat exchanger which receives the hot product gases of combustion from the gas burner. This limited heat conduction path can, for example, be achieved by the number and area of metallic joints between the heat exchanger and the calorifiers whlch may be in the form of coiled tubes dlsposed about a tubular combustion chamber constituting said heat exchanger.
The flow of hot product gases from the burner to the exhaust outlet may be by natural draught or may be assisted by a fan. The fan 10 may be located at the combustion air inlet to the burner or alternatively at the exhaust gas outlet.
By way of example, an embodiment of the invention ~ill now be further described with reference to the accompanying diagrammatic drawing which is a vertical sectional elevation not to scale.
Referring to the drawing, the water heater shown is designed for domestic heating to provide hot water for domestic purposes, for example, washing and for space heating. The heater comprises an outer casing 1 having a main cold water feed inlet 2 arranged to replenish any water drawn off from a hot water outlet 3 from the reservoir of 20 water 4 contained within the casing. Within the upper part of the casing is mounted a water distribution plate 5 to which water from the reservoir 4 is fed by recirculation through a pipe 6 by a pump 7.
Beneath the plate 5 is supported a heat transfer means in the form of a ~ 4 ~ ~ 2 ~ 2 ~ 3 saturator unit 8. Pro~ecting vertically upwards from the bottom of the casing i9 an immersion tube heat exchanger 9 in the form of a combustion chamber having an outlet 11 for the passage of hot product gases of combustion from a fan assisted premixed gas burner 12 mounted on the ou~side of the casing 1 and arranged to fire into the immer3ion tubs 9. The tube 9 may be provided with baffles 13 for extracting heat from the hot product gases flowing over them. A canopy deflector 14 is fitted over the immersion tube outlet 11 and a demister pad 15 is provided in an exhaust product gas outlet 16 at the top of the heater 10 so as to remove any entrained water particles from the exhaust gases.
A calorifier 17 in the form of a coiled tube located in the reservoir 4 and around the immersion tube 9 provides hot water for space heating.
A further calorifier 18 similarly located in the form of a spirally coiled tube conveniently fed with mains pressurised or locally pumped 15 water provides hot water, e.g., for a shower bath.
The water distribution plate 5 is in the form of a shallow metal tray having numerous substantially equispaced apertu~es 19 each of which is formed wi~h an upstanding rim. In this way recirculated feed water from the pipe 6 will collect in the troughs around the rimmed 20 apertures 19 and eventually 5pill over the rims in weir-like manner through the apertures to produce an evenly distributed flow of water droplets into the saturator unit 8.
The saturator unlt 8 conaists of a metal contalner 21 with a perforate base 22 filled with a packed bed of graded solid particles or .
126;~ 33 Raschig rings 23 formed from, for example, stainless steel, glass, aggregate or any suitable heat and corrosion resistant ~aterial over and through which the feed water from the distribution plste 5 passes.
Where it is desired to reduce the nitrate and nitrite levels of the water being drawn off from the reservoir 4 suitable chemicals may be added to or mixed with the bed of particles 23. Chemicals such an anion exchange resins would be suitable, for example,'Amberlite' IRA
410 (Registered Trade Mark) which is made up of a cross-linked polystyrene-divinylbenzene matrix incorporating a strongly basic active 10 group, e.g., quaternary ammonium salt (R4N~Cl-~ in the form of a chloride and in which R is an alkyl group.
The numbers and size of the apertures and perforatlons in the plate 5 and container base 22 and the geometrical shape of the bed of solid particles or Raschig rings 23 will depend on a number of factors 15 involving heater capacity, water flow rate, burner ~low rate, wettable surface areas, product gas pressure and required efficiency.
In operation of the water heater, the premixed gas burner 12 fires hot co~bu~tion product gases into the immersion tube heat exchanger 9 which is designed indirectly to exchange a substantial part 20 of the available heat from the burner's hot combustion product gases to the surrounding water reservoir ~. The gases will leave the ~ube 9 through the outlet 11 at a relative low temperature of between 100 150C. The canopy 14 shields the outlet from falling water and may assist in the upward distributlon of product gases.
I
~ - 6 - ~2~83 These hot gases then travel upwa~dly impinging upon, and passing through the apertures ln the perforate base 22, over the Raschig rings 23, and through the distribution plate 5 so as to be in dlrect heat exchange contact wlth the streams of water droplets flowing ln a counter flow direction. By the time the product gases reach the top of the heater, most of the available heat has been removed and the product gases leave the flue outlet 16 at a few degrees centigrade above the feed water inlet temperature.
A water heater in accordance with the invention havlng a compact 10 saturator unit as aforesaid has the advantage of providing a high wettable surface area, in the minlmum of space, for the maximum exchange of heat from the hot gases to the feed water passing over the closely packed saturator materlals and with a minimal pressure drop of the hot gases. With thls arrangement, the slze of the middle heat 15 transfer section of the heater described in the aforementioned Canadian Patent No. 1,225,886 is considerably reduced. This enables the presently invented heater to employ a larger capacity reservoir of hot water and associated calorifiers without necessarily increasing the overall size of the heater.
In a test of a typical gas-fired water heater in accordance with that described and shown with reference to the drawing, the performance data was as follows:-. .
e ~ . i , .
~ 7 ~ ~ ~62~83 Rated Input Gas 7.9kW
Feed Water Inlet 47C
Feed Water Flow Rate 250 litres/hour Flue e~haust gas temperature 49C
This corresponds to an overall heater efPiciency in excess of 91%
based on the gross calorific value of the fuel gas. The overall efficiency oP a heater in accordance with the invention i8 only marginally reduced a~ the water outlet temperature is raised.
. , .
-"
~. .
,:
Claims (7)
1. In a compact, gas-fired water heater which comprises a casing that defines a reservoir for collecting water; a water inlet pipe connected to said casing to supply cold water to said reservoir;
a water outlet pipe connected to said casing to remove heated water from said reservoir; a heat exchanger means located within said casing which extends upwardly through said reservoir to an outlet opening above said reservoir a gas burner for supplying heater combustion gases to the interior of said heat exchanger means; a deflection canopy located within said casing and above the outlet opening of said heat exchanger means; a distribution means located in said casing above both said reservoir and said deflection canopy for providing a plurality of downwardly falling streams of water; water supply means for supplying water to said distribution means; a heat transfer means located in said casing below said distribution means and above both said reservoir and said deflection canopy; and an exhaust gas outlet means located above said water distribution means; the improvement wherein said heat transfer means comprises a generally pan-shaped metal container having a perforated base and containing a plurality of solid materials in the form of a packed bed, said solid materials including inert materials and an anion exchange resin; and wherein said water heater includes a calorifier for heating a stream of water passing therethrough, said calorifier comprising a first tube portion which extends through said easing and into said reservoir, a second tube portion which is connected to said first tube portion and is coiled around said heat exchanger means, and a third tube portion which is connected to said second tube portion and extends through said casing and out of said reservoir.
a water outlet pipe connected to said casing to remove heated water from said reservoir; a heat exchanger means located within said casing which extends upwardly through said reservoir to an outlet opening above said reservoir a gas burner for supplying heater combustion gases to the interior of said heat exchanger means; a deflection canopy located within said casing and above the outlet opening of said heat exchanger means; a distribution means located in said casing above both said reservoir and said deflection canopy for providing a plurality of downwardly falling streams of water; water supply means for supplying water to said distribution means; a heat transfer means located in said casing below said distribution means and above both said reservoir and said deflection canopy; and an exhaust gas outlet means located above said water distribution means; the improvement wherein said heat transfer means comprises a generally pan-shaped metal container having a perforated base and containing a plurality of solid materials in the form of a packed bed, said solid materials including inert materials and an anion exchange resin; and wherein said water heater includes a calorifier for heating a stream of water passing therethrough, said calorifier comprising a first tube portion which extends through said easing and into said reservoir, a second tube portion which is connected to said first tube portion and is coiled around said heat exchanger means, and a third tube portion which is connected to said second tube portion and extends through said casing and out of said reservoir.
2. The compact, gas-fired water heater as defined in claim 1, wherein said inert materials comprise graded solid particles.
3. The compact, gas-fired water heater as defined in claim 2, wherein said graded solid particles comprise stainless steel.
4. The compact, gas-fired water heater as defined in claim 2, wherein said graded solid particles comprise glass.
5. The compact, gas-fired water heater as defined in claim 1, wherein said inert materials comprise Raschig rings.
6. The compact, gas-fired water heater as defined in claim 1, wherein said anion exchange resin comprises a cross-linked polystyrene-divinylbenzene matrix incorporating a strongly basic active group.
7. The compact, gas-fired water heater as defined in claim 6, wherein said strongly basic active group consists of a quaternary ammonium chloride salt, R4N+Cl-, wherein R is an alkyl group.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8428166 | 1984-11-07 | ||
| GB848428166A GB8428166D0 (en) | 1984-11-07 | 1984-11-07 | Gas-fired water heaters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1262083A true CA1262083A (en) | 1989-10-03 |
Family
ID=10569398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000493537A Expired CA1262083A (en) | 1984-11-07 | 1985-10-22 | Gas-fired water heaters |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4658803A (en) |
| EP (1) | EP0181703A3 (en) |
| JP (1) | JPS61116247A (en) |
| CA (1) | CA1262083A (en) |
| GB (2) | GB8428166D0 (en) |
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| JPH0833237B2 (en) * | 1988-04-28 | 1996-03-29 | 株式会社スワーク | Hot water method and apparatus |
| JPH0262354U (en) * | 1988-10-26 | 1990-05-09 | ||
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| RU2492395C1 (en) * | 2012-03-07 | 2013-09-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Астраханский государственный университет" | Contact-surface water heater |
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| RU2503893C1 (en) * | 2012-05-04 | 2014-01-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Астраханский государственный университет" | Gas water heater |
| US9328591B2 (en) | 2012-08-23 | 2016-05-03 | Enservco Corporation | Air release assembly for use with providing heated water for well related activities |
| RU2527824C1 (en) * | 2013-08-01 | 2014-09-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" | Condensing water-heating boiler |
| RU2566870C1 (en) * | 2014-09-24 | 2015-10-27 | Закрытое акционерное общество "Омский завод инновационных технологий" | Fire-tube hot-water boiler |
| US10323200B2 (en) | 2016-04-12 | 2019-06-18 | Enservco Corporation | System and method for providing separation of natural gas from oil and gas well fluids |
| JP6913919B2 (en) * | 2017-04-20 | 2021-08-04 | 有限会社エフ・エム・シー | Wood combustion water heater |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US884223A (en) * | 1907-05-31 | 1908-04-07 | Albert E Shipley | Instantaneous water-heater. |
| US1341048A (en) * | 1919-04-11 | 1920-05-25 | Drevet Emile | Water-heater |
| US3060921A (en) * | 1958-08-12 | 1962-10-30 | Exxon Research Engineering Co | Apparatus for heating liquids |
| CH402342A (en) * | 1962-10-22 | 1965-11-15 | Miyahara Kingo | Liquid heater |
| GB1152059A (en) * | 1965-10-28 | 1969-05-14 | Kingo Miyahara | Improvements in or relating to Water Heaters |
| FR2027178A1 (en) * | 1968-12-27 | 1970-09-25 | Hanrez Sa J Atel | |
| US3826240A (en) * | 1973-02-23 | 1974-07-30 | Dowa Co | Direct contact water heater |
| BE805296A (en) * | 1973-09-25 | 1974-01-16 | Hanrez Sa J Atel | CONDENSATION TYPE HEAT GENERATOR FOR COMBUSTION PRODUCTS AND HEATING PROCESS FOR A HEAT TRANSFER FLUID |
| SU506731A1 (en) * | 1973-10-23 | 1976-03-15 | Gas stove-boiler | |
| US4275708A (en) * | 1978-08-31 | 1981-06-30 | Wood Harry E | Combined hot water heating and stripping column furnace and method |
| JPS55146348A (en) * | 1979-05-01 | 1980-11-14 | Du Pont | Fluid heater and method of heating fluid |
| US4380215A (en) * | 1981-07-16 | 1983-04-19 | Mendelson Walton L | Liquid fuel-fired water heating tank |
| GB2129916B (en) * | 1982-11-10 | 1986-02-05 | British Gas Corp | Gas-fire water heaters |
-
1984
- 1984-11-07 GB GB848428166A patent/GB8428166D0/en active Pending
-
1985
- 1985-10-14 GB GB08525278A patent/GB2166853A/en not_active Withdrawn
- 1985-10-14 EP EP85307341A patent/EP0181703A3/en not_active Withdrawn
- 1985-10-22 CA CA000493537A patent/CA1262083A/en not_active Expired
- 1985-10-24 US US06/791,161 patent/US4658803A/en not_active Expired - Lifetime
- 1985-11-07 JP JP60249908A patent/JPS61116247A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB2166853A (en) | 1986-05-14 |
| JPH023903B2 (en) | 1990-01-25 |
| GB8428166D0 (en) | 1984-12-12 |
| GB8525278D0 (en) | 1985-11-20 |
| EP0181703A2 (en) | 1986-05-21 |
| US4658803A (en) | 1987-04-21 |
| JPS61116247A (en) | 1986-06-03 |
| EP0181703A3 (en) | 1988-01-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |