GB1596615A - Heat exchanger for a gas- or oil-fired continuous flow water heater - Google Patents
Heat exchanger for a gas- or oil-fired continuous flow water heater Download PDFInfo
- Publication number
- GB1596615A GB1596615A GB22726/78A GB2272678A GB1596615A GB 1596615 A GB1596615 A GB 1596615A GB 22726/78 A GB22726/78 A GB 22726/78A GB 2272678 A GB2272678 A GB 2272678A GB 1596615 A GB1596615 A GB 1596615A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hot water
- water pipe
- mains
- heat exchanger
- pipes
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 202
- 238000003491 array Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- 239000000567 combustion gas Substances 0.000 claims description 3
- 210000005069 ears Anatomy 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000008399 tap water Substances 0.000 description 7
- 235000020679 tap water Nutrition 0.000 description 7
- 239000002184 metal Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
- F24H1/526—Pipes in pipe heat exchangers for sanitary water
-
- 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
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
Landscapes
- 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)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Description
(54) HEAT EXCHANGER FOR A GAS- OR OIL-FIRED
CONTINUOUS-FLOW WATER HEATER
(71) We, ROBERT BOSCH GMBH, a
German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to a heat exchanger for a gas- or oil-fired continuousflow water heater used both to heat up the water in a central heating system and to heat tap water. The heat exchanger is of a type comprising an assembly of fins, a system of a plurality of hot water pipes which pass through the assembly, and a mains water pipe coil which runs at least partially inside the hot water pipe system.
A water heater of the above type is already known (German Gebrauchsmuster 6 607 211) wherein the hot water pipes and the sections of the mains water pipe coil inside these pipes are produced as an integral structure from an extrusion press profile. This entails a mode of joining of adjacent hot water and mains water pipe sections, which is relatively complicated and, therefore. expensive. In a further embodiment disclosed in the abovementioned publication, pipe sections forming two hot water pipes and an intermediate mains water pipe section each comprise two shell halves tightly joined together; and in order to obtain a good thermal joint between the pipe sections for the hot water and the mains water, two channel-like Ushaped profiles which are used to form the hot water pipe sections are soldered or welded in a diametrically opposed manner onto a section of the mains water pipe.This embodiment is. thus, also complicated and as a result not very suitable for massproduction.
A heat exchanger is also known, wherein straight sections of the mains water pipe coil extending into the hot water pipes, are provided with four longitudinally running grooves, and are guided into the hot water pipes, which have a circular cross-section, by the longitudinal portions of the sections between adjacent grooves. This embodiment is disadvantageous because the rate of flow of the mains water over the crosssection of the mains water pipe, which differs greatly from the circular form, varies considerably and concentrated lime deposits are formed in the zones where there is a slow rate of flow, such deposits increasing the flow resistance, making the transfer of heat from the hot water to the mains water difficult and shortening the intervals between the servicing of the heat exchanger.
There is provided by the present invention a heat exchanger for a gas- or oil-fired continuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass therethrough, and a mains water pipe coil providing straight sections which run at least partly inside the hot water pipes, wherein
a) the hot water pipes have a generally oval cross-section,
b) in each hot water pipe two straight sections of the mains water pipe coil are disposed,
c) the straight sections of the mains water pipe coil each have a cross-section which is at least substantially circular.
By comparison with the known heat exchangers, the heat exchanger according to the invention has the advantage that a relatively large heat transfer surface area is produced between the hot water and mains water because of the disposition of the mains water pipes in the hot water pipes, and that, because of the circular crosssection of the mains water pipe coil. a high rate of flow with severe turbulence over the entire cross-section and a wall temperature which is uniformly low in the peripheral direction are produced in the mains water pipe coil.The calcination rate i.e. rate of line deposition, for the mains water pipe coil is thereby considerably reduced and, in conjunction with the relatively large heat transfer surfaces, this produces a good heat transfer to the mains water and a low effective temperature difference between the circulating water and mains water with the given high degree of efficiency of the heat exchanger.
The mains water pipe coil may be of a reversed, two part construction with one part forming a cold water inlet part, and with the other part forming a heated water outlet section and reversing the flow of water admitted to the first part, and when so constructed, the connection to the two parts may readily be arranged adjacent one another, and the entire mains water pipe coil may readily be forcibly rinsed through when the coil is being decalcified after a long operational period.
With the above described embodiment for the mains water pipe coil, it is also possible for the mains water to be conducted over some sections in the same flow as the hot water and over other sections in the flow counter to the hot water irrespective of the conduction of the hot water. A good heat transfer from the hot water to the internally conducted mains water can thereby be achieved.
Having regard to the need for as little calcination as possible, it is advantageous for the first train of the mains water pipe coil to be disposed in the plane which is closer to the source of heat, so that there is a wall temperature which is still relatively low in the region of the relatively high heat supply.
Experiments have shown that the tap water has only reached about 2/3 its final temperature by the time the tap water deflects into the second train located in the upper plane.
The flow directions or guidances of the tap water and the hot water are suitably chosen so that more sections are traversed in the flow counter to the hot water than in the same flow as the hot water in the plane of the mains water pipe coil which is more remote from the source of heat (second train). This produces the advantage that, with a relatively small effective temperature difference in this plane because of the predominant counter-flow operation, an improved transfer is still achieved.
With as little temperature difference as
possible relative to the hot water, the
transfer of heat to the tap water requires as large a heat transfer surface as possible
which must be accommodated in the hot
water pipes. Thus, the tap water pressure
loss may not exceed a specific value, a
minimum cross-sectional area of passage
being thereby fixed for the tap water. On the other hand, however, the pressure loss of the hot water is also limited, so that a specific minimum cross-sectional area of passage must be made available for the hot water. It is therefore necessary to make accurate adjustments for these requirements, and it should also be ensured that the entire cross-sectional area of passage for the combustion gases in the assembly of fins is also within a prescribed range of values.
The pressure loss in the hot water pipe system may be kept small when adjacent hot water pipes are arranged to form two arrays providing parallel flow and there are formed supply and discharge chambers which respectively cover the hot water pipes of the two arrays at one end of the pipes and a deflection chamber covering the heating pipes of two arrays at the other end of the pipes.
One embodiment which is advantageous from the point of view of conventional dimensions for the heat exchanger and a good transfer of heat to the mains water is produced when each arrav comprises three pipes and the connections of the mains water pipe coil are located on that end of the assembly of fins whereat the hot water connections are also provided.
A particularly good transfer of heat from the hot water to the mains water is achieved when the curved portions of the mains water pipe coil are located inside the chambers for the supply, discharge and deflection of the hot water. It is thereby achieved that a transfer of heat to the mains water is also effected in the region of the curved portions, this transfer of heat being particularly intensive because of the high turbulence of the hot water and the mains water.
An embodiment of the invention is shown in the accompanying drawing in which:
Figure I is a side elevation of the heat exchanger and;
Figure 2 is a part section along the line II-II in Figure 1.
The heat exchanger has an assembly of fins 10, through central holes in which six hot water pipes 11. of oval cross-section, are conducted. The individual fins are provided with collars 12 at the central holes, the fins being soldered to the hot water pipes 11 by means of these collars. The ends of the hot water pipes 11, on both ends of the assembly of fins 10. are each soldered into a respective base plate 13 formed as a piece of drawn sheet metal with a raised flange edge 14.
The base plates 13 at both ends of the assembly have the same shape and this simplifies manufacture and stock-keeping.
Placed upon the base plate 13. as seen on the left in Figure 2, is a cover plate 16 which is also formed by a piece of drawn sheet metal with a flange edge 17 and is welded tightly to this flange edge with the base plate 13. The cover plate 16 has a recess 18 which abuts on a small outwardly curved portion 19 of the base plate 13, and forms with this portion 19 a seal between two chambers 20 and 21. The three hot water pipes 11 which appear uppermost as they are seen in the drawing, at the left hand side thereof, open out into the chamber 20, and the three thereof which appear lowermost, open out at the same end into chamber 21. The base plate 13 on the right of the drawing of
Figure 2 forms with a cover plate 22, a chamber 23 into which all six hot water pipes 11 at their right hand end as seen in
Figure 2 open out.The chamber 20 is provided with a pipe union 24 (Figure 1) for a heating feed line, and the chamber 21 is provided with a pipe union 25 for a heating return line. Both unions 24 and 25 are disposed at what is, in use of the heat exchanger, the lower edge side 26 of the cover plate 16, so that the pipes which are to be connected thereto do not increase the overall width of the heat exchanger. In the chamber 23, the hot water supplied by way of the chamber 21 through the three of the hot water pipes 11 which appear lowermost as seen in the drawing is diverted into the three hot water pipes 11 which appear uppermost in the drawing, whence the water reaches the heating feed line by way of the chamber 20.
The heat exchanger is also provided with a mains water pipe coil 30 whose straight sections 31 extend through the hot water pipes 11. The straight sections 31 are joined externally of the hot water pipes 11 by curved portions 32 and 33 which are disposed inside the chambers 20, 21, 23 and are thus surrounded by hot water. The curved portions 33 are integrally moulded onto the straight sections 31 of the mains water pipe
coil, whilst the curved portions 32 are soldered onto these sections. The mains water pipe coil 30 is of what may be called a
reversed, two-part, construction, i.e. it has a first-part 34 on the inlet side i.e. the side nearest the source of the gas or oil burner,
which appears in Figure 1 on the left-hand side, and. a second in this instance, dupli
cate, part 35 on the outlet side which is seen from above in Figure 2 and thus hides from view the first part 34.The two parts 34 and 35 are located directly one on top of the
other, have a circular cross-section and, for retaining their position in the hot water pipes 11, are provided on the outer periphery with individual knobs or ears 36
(Figure 1) which touch the inner wall of the hot water pipes 11. The connecting ends 37
and 38 of the two parts 34 and 35 are bent in such a manner and are such a length that they pass through the cover plate 16 with a sufficient separation between them to render satisfactory soldering possible. In the region of the connecting ends 37 and 38, the cover plate 16 is recessed at 42 for accommodating connecting pieces 43 and 44 which are soldered onto the ends 37 and 38.
Internally of the chamber 20, the two parts 34 and 35 of the mains water pipe coil 30 are also inclined away from each other and joined together by way of a 180C curved portion 45 which in use the heat exchanger is also surrounded by hot water.
Moulded onto the wall of the chamber 20 is a union 48 (Figure 1) having a bore 50 (Figure 2) which serves to accommodate a feed temperature gauge constituted by, e.g., an NTC (negative temperature coefficient) resistor. Because of the position chosen for the bore 50, the gauge extends into the space between the curved portions 32 and 45 in the chamber 20, thus producing a particularly good circulation of water around the gauge and consequently a low-inertia detection of temperature changes.
The heat exchanger is easily assembled so that the fins and the base plates 13 are initially soldered to the hot water pipes 11 and then the straight sections 31 of the mains water pipe, which are joined in pairs by way of the curved portions 33, are inserted into the hot water pipes 11 from the side of the chamber 23. Afterwards, the curved portions 32 and 45 are soldered onto the free ends of the sections 31, and the cover plate 16 and 22 is placed upon the base plates 13 and welded thereto at the edge. The recess 18 in the cover plate 16 thereby abuts the raised portion 19 on the base plate 13, so that the two chambers 20 and 21 are formed and are adequately sealed one from the other without any additional measures.Finally, in one working operation, the connecting ends 37 and 38 of the mains water pipe coil 30 are each soldered to the cover plate 16 and the pieces 42 and 43 respectively. The cover plate 16 thereby ensures that the connecting ends 37 and 38 cannot be deflected towards the fin assembly 10.
The heat exchanger which is described provides a good transfer of heat to the mains water. Thus, the temperature difference between the hot water and mains water discharge temperature may only be approximately 11"C., whereas, in a tested known appliance, this temperature difference was approximately 30"C. This means that the heat exchanger of the present embodiment, relative to a specific output, has lower wall temperatures and is less inclined to calcify than the tested known appliance. This is achieved in large part by the reversed, two-part, design of the mains water pipe coil in the oval hot water pipes and the circular cross-section of the straight sections of the mains water pipe coil which pass through the hot water pipes.Despite the high heat transmission, the higher heat supply at the colder mains water inlet part 34 produces only moderate wall temperatures for this part. In the second part 35 remote from the heating source, four straight sections 31 of the mains water pipe coil 30 run in a flow counter to the hot water and only two sections 31 run in the same flow relative to the hot water, so that, despite a smaller temperature difference relative to the combustion gases, there is still a good transfer of heat in this part. The disposition of two mains water pipes in one respective hot water pipe produces a good heat transfer surface without the flow in the mains water pipes being disadvantageously affected in respect of the inevitable calcination.The associated reduction in the cross-sectional area of passage for the hot water is balanced by the described parallel connection and stacking of the hot water pipes. At the same time there is the already described advantageous alternation of direct-flow and counter-flow in the operation of the mains water relative to the hot water.
The above-described embodiment is also described in copending Application No.
22727/78 (Serial No. 1596616).
WHAT WE CLAIM IS:
1. A heat exchanger for a gas- or oilfired continuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass therethrough, and a mains water pipe coil providing straight sections which run at least partly inside the hot water pipes, wherein
a) the hot water pipes have a generally oval cross-section,
b) in each hot water pipe two straight sections of the mains water pipe coil are disposed.
c) the straight sections of the mains water pipe coil each have a cross-section which is at least substantially circular.
2. A heat exchanger according to claim 1, wherein the two straight mains water pipe sections in each hot water pipe are disposed one side by side or one above the other.
3. A heat exchanger as claimed in claim 1 or 2, wherein the mains water pipe coil is of a reversed, two-part construction with one part forming a cold water inlet part, and with the other part forming a heated water outlet part and providing a reversal of the flow of the water admitted to the inlet part.
4. Heat exchanger as claimed in claim 3, wherein the two parts of the mains water pipe coil are arranged one above the other with said first part being disposed in the plane lying nearer to the source of heat.
5. Heat exchanger as claimed in any of claims 1 to 4, wherein the straight sections of the mains water pipe coil protruding in a hot water pipe are each held at a distance away from the wall of the hot water pipe.
6. Heat exchanger as claimed in claim 5, wherein said straight sections of the mains water pipe coil are held at a distance from the walls of the hot water pipes by ears disposed on the periphery of the straight sections.
7. Heat exchanger as claimed in claim 3 or any of claims 4 to 6 as dependent on claim 3, wherein the flow directions of the hot water and mains water are selected so that more sections of the mains water pipes are traversed counter to the flow of the hot water than are traversed in the same flow direction as the hot water in said second part of the mains water pipe coil.
8. Heat exchanger as claimed in any of the preceding claims, wherein adjacent hot water pipes are arranged to form two arrays providing parallel flow-through, and there are formed supply and discharge chambers which respectively cover the hot water pipes of the arrays at one end of the pipes, and a deflection chamber which covers the hot water pipes of both arrays at the other ends of the pipes.
9. Heat exchanger as claimed in claim 8, wherein each hot water pipe array comprises three adjacent hot water pipes, and the connections of the mains water pipe coil are disposed at that end of the assembly of fins where the hot water connections are also provided.
10. Heat exchanger as claimed in either claim 8 or 9, wherein curved portions of the mains water pipe coil are located inside the chambers respectively for the supply, discharge and deflection of the hot water.
11. Heat exchanger according to claim 1 for a gas-or oil-fired continuous water heater, substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
- **WARNING** start of CLMS field may overlap end of DESC **.transmission, the higher heat supply at the colder mains water inlet part 34 produces only moderate wall temperatures for this part. In the second part 35 remote from the heating source, four straight sections 31 of the mains water pipe coil 30 run in a flow counter to the hot water and only two sections 31 run in the same flow relative to the hot water, so that, despite a smaller temperature difference relative to the combustion gases, there is still a good transfer of heat in this part. The disposition of two mains water pipes in one respective hot water pipe produces a good heat transfer surface without the flow in the mains water pipes being disadvantageously affected in respect of the inevitable calcination.The associated reduction in the cross-sectional area of passage for the hot water is balanced by the described parallel connection and stacking of the hot water pipes. At the same time there is the already described advantageous alternation of direct-flow and counter-flow in the operation of the mains water relative to the hot water.The above-described embodiment is also described in copending Application No.22727/78 (Serial No. 1596616).WHAT WE CLAIM IS: 1. A heat exchanger for a gas- or oilfired continuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass therethrough, and a mains water pipe coil providing straight sections which run at least partly inside the hot water pipes, wherein a) the hot water pipes have a generally oval cross-section, b) in each hot water pipe two straight sections of the mains water pipe coil are disposed.c) the straight sections of the mains water pipe coil each have a cross-section which is at least substantially circular.
- 2. A heat exchanger according to claim 1, wherein the two straight mains water pipe sections in each hot water pipe are disposed one side by side or one above the other.
- 3. A heat exchanger as claimed in claim 1 or 2, wherein the mains water pipe coil is of a reversed, two-part construction with one part forming a cold water inlet part, and with the other part forming a heated water outlet part and providing a reversal of the flow of the water admitted to the inlet part.
- 4. Heat exchanger as claimed in claim 3, wherein the two parts of the mains water pipe coil are arranged one above the other with said first part being disposed in the plane lying nearer to the source of heat.
- 5. Heat exchanger as claimed in any of claims 1 to 4, wherein the straight sections of the mains water pipe coil protruding in a hot water pipe are each held at a distance away from the wall of the hot water pipe.
- 6. Heat exchanger as claimed in claim 5, wherein said straight sections of the mains water pipe coil are held at a distance from the walls of the hot water pipes by ears disposed on the periphery of the straight sections.
- 7. Heat exchanger as claimed in claim 3 or any of claims 4 to 6 as dependent on claim 3, wherein the flow directions of the hot water and mains water are selected so that more sections of the mains water pipes are traversed counter to the flow of the hot water than are traversed in the same flow direction as the hot water in said second part of the mains water pipe coil.
- 8. Heat exchanger as claimed in any of the preceding claims, wherein adjacent hot water pipes are arranged to form two arrays providing parallel flow-through, and there are formed supply and discharge chambers which respectively cover the hot water pipes of the arrays at one end of the pipes, and a deflection chamber which covers the hot water pipes of both arrays at the other ends of the pipes.
- 9. Heat exchanger as claimed in claim 8, wherein each hot water pipe array comprises three adjacent hot water pipes, and the connections of the mains water pipe coil are disposed at that end of the assembly of fins where the hot water connections are also provided.
- 10. Heat exchanger as claimed in either claim 8 or 9, wherein curved portions of the mains water pipe coil are located inside the chambers respectively for the supply, discharge and deflection of the hot water.
- 11. Heat exchanger according to claim 1 for a gas-or oil-fired continuous water heater, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772742839 DE2742839A1 (en) | 1977-09-23 | 1977-09-23 | HEAT TRANSFER FOR A GAS OR OIL-HEATED FLOW WATER HEATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1596615A true GB1596615A (en) | 1981-08-26 |
Family
ID=6019706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22726/78A Expired GB1596615A (en) | 1977-09-23 | 1978-05-25 | Heat exchanger for a gas- or oil-fired continuous flow water heater |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT374265B (en) |
| DE (1) | DE2742839A1 (en) |
| ES (1) | ES473605A1 (en) |
| FR (1) | FR2404179A1 (en) |
| GB (1) | GB1596615A (en) |
| IT (1) | IT1110157B (en) |
| NL (1) | NL183739C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2116688A (en) * | 1982-03-18 | 1983-09-28 | Deedmark Ltd | Heat exchangers |
| GB2119073A (en) * | 1982-04-16 | 1983-11-09 | Steinecker Maschf Gmbh | Heat exchanger having a set of pipes |
| WO1997037189A1 (en) * | 1996-04-03 | 1997-10-09 | Cabot Corporation | Improved heat exchanger |
| WO2014110650A1 (en) * | 2013-01-15 | 2014-07-24 | Gilles Savard | Air-liquid heat exchanger |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3333730A1 (en) * | 1983-09-17 | 1985-03-28 | Etablissement Agura, Vaduz | Heating boiler with heating register of serpentine form |
| DE3601332A1 (en) * | 1985-01-31 | 1986-08-07 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Fuel-heated heat source |
| FR2627266B1 (en) * | 1988-02-16 | 1990-06-01 | Leblanc Sa E L M | CENTRAL HEATING SYSTEM WITH HOT WATER CIRCUIT FOR SANITARY USE |
| AT395268B (en) * | 1988-04-15 | 1992-11-10 | Vaillant Gmbh | WATER HEATER |
| AT397302B (en) * | 1990-04-20 | 1994-03-25 | Vaillant Gmbh | BLADE BLOCK FOR A COMBINED WATER HEATER |
| FR2666404B1 (en) * | 1990-09-05 | 1992-11-27 | Chaffoteaux Et Maury | IMPROVEMENTS ON THE HEATING BODIES FOR MIXED BOILERS. |
| AT406085B (en) * | 1998-04-06 | 2000-02-25 | Vaillant Gmbh | HEATING SHAFT |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE632468A (en) * | ||||
| US3074480A (en) * | 1960-09-14 | 1963-01-22 | Brown Fintube Co | Heat exchanger |
| FR1316031A (en) * | 1962-01-29 | 1963-01-25 | Saunier Duval | Two-use gas boiler heaters |
| CH433653A (en) * | 1964-11-19 | 1967-04-15 | Runtaltherm Ag | Process for the optional heating of liquids and equipment for carrying out this process |
| FR1460169A (en) * | 1965-11-15 | 1966-06-17 | Runtaltherm Ag | Method for selective heating of liquids and device for implementing this method |
| FR1484821A (en) * | 1966-05-06 | 1967-06-16 | Daniel Sa Des Ets | heat exchanger for central heating boilers comprising a heating water circuit and a domestic hot water circuit |
| DE6607211U (en) * | 1966-07-01 | 1971-02-11 | Runtaltherm Ag | LIQUID SENSOR WITH GAS OR OIL HEATING |
| FR1535691A (en) * | 1966-07-01 | 1968-08-09 | Runtaltherm A G | Gas or oil-fired liquid heater |
-
1977
- 1977-09-23 DE DE19772742839 patent/DE2742839A1/en active Granted
-
1978
- 1978-05-25 GB GB22726/78A patent/GB1596615A/en not_active Expired
- 1978-09-05 FR FR7825551A patent/FR2404179A1/en active Granted
- 1978-09-19 IT IT27808/78A patent/IT1110157B/en active
- 1978-09-20 AT AT0678878A patent/AT374265B/en not_active IP Right Cessation
- 1978-09-22 NL NLAANVRAGE7809669,A patent/NL183739C/en not_active IP Right Cessation
- 1978-09-22 ES ES78473605A patent/ES473605A1/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2116688A (en) * | 1982-03-18 | 1983-09-28 | Deedmark Ltd | Heat exchangers |
| GB2119073A (en) * | 1982-04-16 | 1983-11-09 | Steinecker Maschf Gmbh | Heat exchanger having a set of pipes |
| WO1997037189A1 (en) * | 1996-04-03 | 1997-10-09 | Cabot Corporation | Improved heat exchanger |
| WO2014110650A1 (en) * | 2013-01-15 | 2014-07-24 | Gilles Savard | Air-liquid heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1110157B (en) | 1985-12-23 |
| NL7809669A (en) | 1979-03-27 |
| ES473605A1 (en) | 1979-04-01 |
| DE2742839C2 (en) | 1990-03-29 |
| NL183739B (en) | 1988-08-01 |
| DE2742839A1 (en) | 1979-04-05 |
| FR2404179B1 (en) | 1983-10-28 |
| ATA678878A (en) | 1983-08-15 |
| FR2404179A1 (en) | 1979-04-20 |
| IT7827808A0 (en) | 1978-09-19 |
| NL183739C (en) | 1991-07-16 |
| AT374265B (en) | 1984-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930525 |