EP0232990A1 - Heating appliance - Google Patents
Heating appliance Download PDFInfo
- Publication number
- EP0232990A1 EP0232990A1 EP87300461A EP87300461A EP0232990A1 EP 0232990 A1 EP0232990 A1 EP 0232990A1 EP 87300461 A EP87300461 A EP 87300461A EP 87300461 A EP87300461 A EP 87300461A EP 0232990 A1 EP0232990 A1 EP 0232990A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- radiator
- heating appliance
- heating
- inner 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.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
- F24D5/06—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated
- F24D5/08—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated with hot air led through radiators
Definitions
- the invention relates to a heating appliance having a radiator tube which is acted upon internally by heating gases from a gas burner connected to the tube at one end.
- Heating appliances of this type are used, in particular, for large area or open places of work in which a temperature-stabilization of the (room) air would be difficult or impossible. It has been found that heating a place of work with heat radiators, particularly with low-temperature heat radiators with internal heating by gas, is not only effective but also economical.
- a particular advantage lies in the fact that a long radiator tube with relatively low temperatures produces a long-wave and therefore gentle radiation of heat which can be well apportioned and purposefully directed in a place of work without heavy losses of waste gas or heat occurring.
- a particular difficulty in this case is to adhere to an optimum working range wherein the tube temperature is sufficiently high for the required heat output but not so high that, with common materials such as steel, it leads to destruction of the tube or exceeds a limiting temperature of 500°C for example prescribed for such installations. Accordingly, it can happen that the radiator tube is above the desired or prescribed temperatures near the gas burner but carries a temperature which is ineffectual for the radiation at the other end as a result of cooling down.
- the object of the invention is to provide a radiant heating appliance which is heated by a gas burner and which renders possible the most effective and large-area radiation possible without dropping below or exceeding preset limiting temperatures of the tube surface.
- this problem is solved starting from a heating appliance in accordance with the preamble to Claim 1 with the characterising features of Claim 1.
- the heat transfer to the tube surface and hence its temperature can be reduced so that overheating above the temperature range to be regarded as particularly favourable and particularly also above prescribed temperature values is avoided in this part of the tube.
- the effect can thus be achieved that, in the further course of the tube, the heating gases supplemented by the conveyed air cause a higher surface temperature and so also better activate the rear end of the radiator tube.
- the radiator tube is preferably of thick-walled design so that, with great thermal inertia, it ensures a uniform temperature radiation even when the gas burner is adjusted to an average preset heating power in intermittent operation
- the inner tube can be thin walled in construction.
- it is preferably formed of stainless steel.
- a heating appliance 1 as shown in Figures 1 and 2 comprises an elongated radiator tube 2 of U-shape which is mounted in a shell-shaped reflector 3 and is connected at one end to a gas burner 4 which projects with its combustion chamber out of a combustion housing 5 in which a solenoid valve is also accommodated to control the supply of gas, and at the other end to a waste-gas blower 6.
- Such a heating appliance heated by the heating gases supplied by the gas burner 4 and drawn through the radiator tube 2 by the waste-gas blower 6, acts essentially as a radiator even if the heating gases also deliver a residual proportion of heat as warm air which can be used for the heating.
- Operation of the radiator tube at relatively low temperatures of 300°C for example, is particularly advantageous, with low-frequency heat radiation which can be directed, without great dispersion losses and convention losses, onto a place of work where it acts with a satisfactory consistency.
- the radiator tube may, for example, be constructed in the form of a thick-walled steel tube in order to provide a heat storage capacity which can bridge the intervals in combustion even in intermittent operation with periodic switching-on times of the gas burner and even out the radiation.
- the temperature drop of the heating gases and the resulting temperature drop of the radiator tube may stand in the way of an effective and uniform utilization of the radiator tube.
- no temperature of more than 500°C should occur which would stress the tube material, shift the heat radiation into a shorter wave range which is already no longer desirable and in addition may be contrary to the building regulations.
- the end at the blower side should not be cooled down too much to be able to contribute appreciably to the total radiation.
- the inner tube 7 is connected directly and tightly to the gas burner 4 so that the gas burner only feeds into the inner tube 7.
- the annular gap between inner tube and outer tube is open to the ambient air; it is also open continuously as far as the rest of the radiator tube 2 so that the waste-gas blower 6 can draw in additional air through the annular gap.
- the inner tube 7 is preferably made of stainless steel. It may, however, since it is only intended to have a shielding function and not a heat storage function, be of thin-walled construction with a view to a saving in costs, for example having a wall thickness of 0.8 to 1.22 mm, while the annular gap between the tubes has a gap width of preferably 3 to 3.5 mm.
- the length of the inner tube 7 is 45% to 55% of the length of the straight portion of the radiator tube in which it is disposed and accordingly constitutes about 1/4 of the total length of the radiator tube.
- Figure 3 illustrates the cross-sectional relationships between inner tube 7, outer tube (and radiator tube) 8 and an annular gap 9 situated in between.
- Figure 4 shows a modified form of embodiment wherein a hexagonal inner tube 10 is disposed in an identical outer tube 8. It is understood that other polygonal cross-sections may also be provided in order to obtain exteriors favourable to flow or simple possibilities for centering the inner tube.
- the shielding aimed at here is achieved in the first instance by the multi-wall construction in a first longitudinal portion 11 determined by the length of the inner tube 7 while the conveying of additional air round the shielding inner tube further distributes the heating along the radiator.
- the inner tube may also be formed from another material, such as ceramic.
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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)
- Gas Burners (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Resistance Heating (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
- The invention relates to a heating appliance having a radiator tube which is acted upon internally by heating gases from a gas burner connected to the tube at one end.
- Heating appliances of this type are used, in particular, for large area or open places of work in which a temperature-stabilization of the (room) air would be difficult or impossible. It has been found that heating a place of work with heat radiators, particularly with low-temperature heat radiators with internal heating by gas, is not only effective but also economical.
- In case of heating appliances of the type here under consideration, a particular advantage lies in the fact that a long radiator tube with relatively low temperatures produces a long-wave and therefore gentle radiation of heat which can be well apportioned and purposefully directed in a place of work without heavy losses of waste gas or heat occurring.
- A particular difficulty in this case, however, is to adhere to an optimum working range wherein the tube temperature is sufficiently high for the required heat output but not so high that, with common materials such as steel, it leads to destruction of the tube or exceeds a limiting temperature of 500°C for example prescribed for such installations. Accordingly, it can happen that the radiator tube is above the desired or prescribed temperatures near the gas burner but carries a temperature which is ineffectual for the radiation at the other end as a result of cooling down.
- To mitigate this problem it has been proposed e.g. in U.S. - A - 4,529,123 to provide a first longitudinal portion of the radiator tube with internal shielding limiting the heating of the radiator tube.
- The object of the invention is to provide a radiant heating appliance which is heated by a gas burner and which renders possible the most effective and large-area radiation possible without dropping below or exceeding preset limiting temperatures of the tube surface.
- According to the invention, this problem is solved starting from a heating appliance in accordance with the preamble to Claim 1 with the characterising features of Claim 1.
- With shielding in a first portion of the radiator tube, in part by room air conveyed through the tube, the heat transfer to the tube surface and hence its temperature can be reduced so that overheating above the temperature range to be regarded as particularly favourable and particularly also above prescribed temperature values is avoided in this part of the tube. At the same time, the effect can thus be achieved that, in the further course of the tube, the heating gases supplemented by the conveyed air cause a higher surface temperature and so also better activate the rear end of the radiator tube.
- Whereas the radiator tube is preferably of thick-walled design so that, with great thermal inertia, it ensures a uniform temperature radiation even when the gas burner is adjusted to an average preset heating power in intermittent operation, the inner tube can be thin walled in construction. In order to avoid oxidizing, it is preferably formed of stainless steel.
- Further features and advantages of the invention are apparent from the Claims and the following description in which two examples of embodiment of the subject of the invention are explained in more detail with reference to a drawing. In the drawing:
- Figure 1 shows a view of a heating appliance from below,
- Figure 2 shows a side view of the heating appliance of Figure 1,
- Figure 3 shows a section through a radiator tube on the line III-III in Figure 1 and
- Figure 4 shows a section corresponding to Figure 3 through a modified radiator tube.
- A heating appliance 1 as shown in Figures 1 and 2 comprises an
elongated radiator tube 2 of U-shape which is mounted in a shell-shaped reflector 3 and is connected at one end to agas burner 4 which projects with its combustion chamber out of acombustion housing 5 in which a solenoid valve is also accommodated to control the supply of gas, and at the other end to a waste-gas blower 6. - Such a heating appliance, heated by the heating gases supplied by the
gas burner 4 and drawn through theradiator tube 2 by the waste-gas blower 6, acts essentially as a radiator even if the heating gases also deliver a residual proportion of heat as warm air which can be used for the heating. Operation of the radiator tube at relatively low temperatures of 300°C for example, is particularly advantageous, with low-frequency heat radiation which can be directed, without great dispersion losses and convention losses, onto a place of work where it acts with a satisfactory consistency. - The radiator tube may, for example, be constructed in the form of a thick-walled steel tube in order to provide a heat storage capacity which can bridge the intervals in combustion even in intermittent operation with periodic switching-on times of the gas burner and even out the radiation.
- The temperature drop of the heating gases and the resulting temperature drop of the radiator tube may stand in the way of an effective and uniform utilization of the radiator tube. Thus, at the beginning of the radiator tube, for example, shortly behind the gas burner, no temperature of more than 500°C should occur which would stress the tube material, shift the heat radiation into a shorter wave range which is already no longer desirable and in addition may be contrary to the building regulations. On the other hand, the end at the blower side should not be cooled down too much to be able to contribute appreciably to the total radiation.
- Here this is met by a partial internal shielding of the
radiator tube 2 in the form of an inner tube 7 which lies coaxially to anouter tube 8 as a continuation of the rest of the radiator tube in this region and forms in cross-section, in relation to the outer tube, a free annular gap which extends over the whole length of the inner tube. - The inner tube 7 is connected directly and tightly to the
gas burner 4 so that the gas burner only feeds into the inner tube 7. In the region of thegas burner 4, the annular gap between inner tube and outer tube is open to the ambient air; it is also open continuously as far as the rest of theradiator tube 2 so that the waste-gas blower 6 can draw in additional air through the annular gap. Thus relative cooling of the first, thermally highly stressed region of the tube and an extension of the emission of heat over theradiator tube 2 are achieved. - Because of the high temperature loading, the inner tube 7 is preferably made of stainless steel. It may, however, since it is only intended to have a shielding function and not a heat storage function, be of thin-walled construction with a view to a saving in costs, for example having a wall thickness of 0.8 to 1.22 mm, while the annular gap between the tubes has a gap width of preferably 3 to 3.5 mm. The length of the inner tube 7 is 45% to 55% of the length of the straight portion of the radiator tube in which it is disposed and accordingly constitutes about 1/4 of the total length of the radiator tube.
- Figure 3 illustrates the cross-sectional relationships between inner tube 7, outer tube (and radiator tube) 8 and an annular gap 9 situated in between. In comparison Figure 4 shows a modified form of embodiment wherein a hexagonal
inner tube 10 is disposed in an identicalouter tube 8. It is understood that other polygonal cross-sections may also be provided in order to obtain exteriors favourable to flow or simple possibilities for centering the inner tube. - It will be understood that the shielding aimed at here is achieved in the first instance by the multi-wall construction in a first
longitudinal portion 11 determined by the length of the inner tube 7 while the conveying of additional air round the shielding inner tube further distributes the heating along the radiator. - It will further be understood that the inner tube may also be formed from another material, such as ceramic.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87300461T ATE52609T1 (en) | 1986-01-20 | 1987-01-20 | HEATING DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863601457 DE3601457A1 (en) | 1986-01-20 | 1986-01-20 | HEATER |
DE3601457 | 1986-01-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0232990A1 true EP0232990A1 (en) | 1987-08-19 |
EP0232990B1 EP0232990B1 (en) | 1990-05-09 |
Family
ID=6292168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87300461A Expired - Lifetime EP0232990B1 (en) | 1986-01-20 | 1987-01-20 | Heating appliance |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0232990B1 (en) |
AT (1) | ATE52609T1 (en) |
DE (2) | DE3601457A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2653536A1 (en) * | 1989-10-25 | 1991-04-26 | Gaz Ind | RADIANT TUBE WITH INTERNAL MODULES. |
WO1996010720A1 (en) * | 1994-09-30 | 1996-04-11 | Jones, Philomena, Joan | Heaters |
US20160215973A1 (en) * | 2015-01-23 | 2016-07-28 | Superior Radiant Products Limited | Radiant tube assembly |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2630195B1 (en) * | 1988-04-14 | 1991-02-22 | Gaz Ind | RADIATION HEATING APPARATUS USING FUEL GAS AS TRANSFORMATION ENERGY |
FR2787557B1 (en) * | 1998-12-22 | 2001-03-09 | Dominique Boudrie | LOW TEMPERATURE HEATING DEVICE AND METHOD |
CN109352294A (en) * | 2018-09-30 | 2019-02-19 | 中国二十冶集团有限公司 | The assembly device and application method of heat radiation tube |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0070360A2 (en) * | 1981-07-17 | 1983-01-26 | Phoenix Burners Limited | A heating system |
US4529123A (en) * | 1983-09-02 | 1985-07-16 | Combustion Research Corporation | Radiant heater system |
EP0164221A1 (en) * | 1984-05-10 | 1985-12-11 | Colt International Holdings A.G. | Heating appliance |
-
1986
- 1986-01-20 DE DE19863601457 patent/DE3601457A1/en not_active Withdrawn
-
1987
- 1987-01-20 AT AT87300461T patent/ATE52609T1/en not_active IP Right Cessation
- 1987-01-20 EP EP87300461A patent/EP0232990B1/en not_active Expired - Lifetime
- 1987-01-20 DE DE8787300461T patent/DE3762683D1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0070360A2 (en) * | 1981-07-17 | 1983-01-26 | Phoenix Burners Limited | A heating system |
US4529123A (en) * | 1983-09-02 | 1985-07-16 | Combustion Research Corporation | Radiant heater system |
EP0164221A1 (en) * | 1984-05-10 | 1985-12-11 | Colt International Holdings A.G. | Heating appliance |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2653536A1 (en) * | 1989-10-25 | 1991-04-26 | Gaz Ind | RADIANT TUBE WITH INTERNAL MODULES. |
WO1991006810A1 (en) * | 1989-10-25 | 1991-05-16 | Gaz Industrie | Radiant tube with internal modules |
WO1996010720A1 (en) * | 1994-09-30 | 1996-04-11 | Jones, Philomena, Joan | Heaters |
US6138662A (en) * | 1994-09-30 | 2000-10-31 | Philomena Joan Jones | Heaters |
US20160215973A1 (en) * | 2015-01-23 | 2016-07-28 | Superior Radiant Products Limited | Radiant tube assembly |
Also Published As
Publication number | Publication date |
---|---|
DE3601457A1 (en) | 1987-07-23 |
ATE52609T1 (en) | 1990-05-15 |
DE3762683D1 (en) | 1990-06-13 |
EP0232990B1 (en) | 1990-05-09 |
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