GB2246849A - Room and tap water heating apparatus includes an accumulator to improve hot water tap response - Google Patents
Room and tap water heating apparatus includes an accumulator to improve hot water tap response Download PDFInfo
- Publication number
- GB2246849A GB2246849A GB9109840A GB9109840A GB2246849A GB 2246849 A GB2246849 A GB 2246849A GB 9109840 A GB9109840 A GB 9109840A GB 9109840 A GB9109840 A GB 9109840A GB 2246849 A GB2246849 A GB 2246849A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- heat exchanger
- room heating
- accumulator
- valve
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000008399 tap water Substances 0.000 title claims abstract description 53
- 235000020679 tap water Nutrition 0.000 title claims abstract description 53
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 239000008236 heating water Substances 0.000 claims abstract description 78
- 238000010079 rubber tapping Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot 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)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Water heating apparatus for heating room heating water and tap water comprises a primary heat exchanger (1) adapted to be heated by a heat source (2). The exchanger (1) is adapted to be selectively connected by valve means (20) to radiators (5) or to a tap water heat exchanger (9). The latter is connected in parallel to the radiators (5) and has a secondary circuit connected to a hot water tap (12). In order to permit a supply of hot water soon after tapping has begun, a room heating water accumulator (8) is provided, which is adapted to be held by a thermostat at a relatively high water temperature and is adapted to be connected to the primary heat exchanger (1) by means of the valve means (20), which are connected between the primary heat exchanger (1) heated by the heat source (2) and the tap water heat exchanger (9). The room heating water accumulator (8) has an outlet that is connected to the inlet of the tap water heat exchanger (9). A control device (13) is responsive to the hot water tap (12) and is operatively connected to actuator means, preferably solenoid actuator means, for the valve means (20). <IMAGE>
Description
Water heating apparatus The present invention relates to water heating
apparatus for heating room heating water and tap water, in which the apparatus comprises a primary heat exchanger adapted to be heated by a heat source and adapted to be selectively connected by valve means to at least one radiator or to a tap water heat exchanger, which is connected in parallel to the or each radiator and has a secondary circuit connected to a hot water tap.
Such apparatus is used to prepare room heating water, which is supplied to radiators, and at the same time to preparehot tap water by means of a tap water heat exchanger. In previously proposed apparatus, a solenoid valve for supplying the tap water heat exchanger opens the supply to that heat exchanger. But this involves the disadvantage that the water which has previously cooled down must be displaced from the primary circuit of the tap water heat exchanger at the beginning of the tapping before any heating of the flowing tap water can be effected. This results in corresponding delays in the preparation of hot water and in a corresponding waste of water.
An aim of the present invention is to avoid this 25 disadvantage and to propose a water heating apparatus which is of the kind described in the opening paragrap and which ensures that hot tap water can be obtaine- S 4 relatively quickly once tapping has been initiated.
Accordingly the present invention is directed to water heating apparatus as set out in the opening paragraph of the present specification, in which a room heating water accumulator is provided, which is adapted to hold water at a relatively high temperature by means of a thermostat and is connected to the primary heat exchanger by the valve means, which are also connected between the primary heat exchanger and the tap water heat exchanger, and in which the room heating water accumulator has an outlet which is connected to the inlet of the tap water heat exchanger, and a control device, which is responsive to tapping of hot water from the hot water tap, and is operatively connected to actuator means, preferably solenoid actuator means, for the valve means.
owing to these measures, hot water from the room heating water accumulator can very quickly be supplied to the tap water heat exchanger so that the inflowing tap water can be heated quickly.
In one form of the present invention, the valve means comprise a first three-way valve by which the primary heat exchanger can be selectively connected to the or each radiator or to the tap water heat exchanger, and a second three-way valve by which the primary heat exchanger is connected to the room heating water accumulator and is also connected between the primary heat exchanger and the said first three-way valve, and in which the actuator 1 i j 1 1 1 i i 1 i means comprise respective actuators for the two three-way valves.
In a preferred embodiment, the said control device upon a beginning of a tapping operation first controls the solenoid valve, which controls the supply of water to the room heating water accumulator, to connect the room heating water accumulator to the flow line from the primary heat exchanger, until a volume of water, corresponding to the total volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator, has flowed into the room heating water accumulator, whereafter the control device controls the solenoid valve for controlling the supply of water to the room heating water accumulator to shut off the supply to the room heating water accumulator and simultaneously controls the solenoid valve controlling the supply to the tap water heat exchanger to open the supply thereto until the end of the tapping operation.
With such a construction, upon the beginning of the tapping operation, hot water from the room heating water accumulator can flow into the tap water heat exchanger so that the tap water can be heated quickly.
Advantageously the three-way valves are connected in series in a line which leads from the primary heat exchanger to the or each radiator, the third port of one three-way valve is connected to the tap water heat exchanger and the other three-way valve which is between 1 4 the primary heat exchanger and the f irst three-way valve is connected at its third port to the inlet of the room heating water accumulator, the outlet of which is connected to the inlet of the tap water heat exchanger.
This can afford the additional advantage that the apparatus can be assembled from commercially available components.
Preferably the volume of water in the room heating water accumulator is at least as large as the total volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator.
This can give the result that a sufficient amount of hot water will flow into the room heating water accumulator so that after an interruption of the operation of the heat source the water which is then contained in the primary heat exchanger and in the lines leading to the room heating water accumulator and in the line leading back to the primary heat exchanger and may have cooled down will be displaced by the said hot water.
In a preferred embodiment the control device upon the beginning of a tapping operation first controls the supply of water to the room heating water accumulator so as to connect the room heating water accumulator to the flow line from the primary heat exchanger and to connect the primary heat exchanger to the room heating circuit until a volume of water which corresponds to the total 1 i i i 1 1 1 volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator, has flowed into the room heating water accumulator, and subsequently controls said supply so as to shut off the supply to the room heating water accumulator and at the same time to open the supply to the tap water heat exchanger.
This can give the result that upon the beginning of a tapping operation hot water from the room heating water accumulator will flow into the tap water heat exchanger so that the tap water can be heated quickly.
According to a further feature the room heating water accumulator is provided with an effective heatinsulating layer and is optionally provided with an additional heater, which has a heat output that is sufficient substantially to compensate the heat losses from the room heating water accumulator.
These measures can give the result that the contents of the room heat heating water accumulator will be held at a high temperature level so that hot water for the primary circuit of the tap water heat exchanger will quickly be available upon the beginning of a tapping operation.
In another form of the present invention the valve means comprise a rotary valve, which is connected to the primary heat exchanger, the or each radiator, the tap water heat exchanger and the inlet and outlet of the room 4 heating water accumulator, and comprise a valve member which is substantially triangular in cross-section.
A control device having such a design may be very compact and permits a simple arrangement of lines and in that case a single actuator for the control device will be sufficient.
A further aspect of the present invention is directed to a rotary valve, which is adapted for use with water heating apparatus, especially water heating apparatus in accordance with the present invention, and which is provided with a substantially cylindrical housing and a valve member which is rotatably held in said housing in which the housing is provided with four ports, which are angularly spaced apart at substantially 90 intervals, and an additional port, which is disposed between two of the said four ports, and in which the valve member has a valve surface extending between diametrically opposite ports of the rotary valve and an additional valve surface, which defines a space that is able to be in communication with two ports spaced 900 apart, and in which the valve member comprises sealing surfaces in contact.with the inside surface of the housing of the rotary valve.
Such a rotary valve may have a simple design and its ports succeeding each other in the clockwise sense may be consecutively connected to the primary heat exchanger, the inlet of the room heating water accumulator, the tap water heat exchanger, the outlet of the room heating water 1 i j I J 1 i i i i 4 accumulator and the radiators. This permits a simple arrangement of lines.
Examples of water heating apparatus made in accordance with the present invention are illustrated in the accompanying drawings, in which:
Figure 1 shows a diagrammatic cross-sectional view of such water-heating apparatus; Figure 2 shows a diagrammatic cross-sectional view of modified water heating apparatus; and Figures 3 to 6 show diagrammatic cross-sectional views of a rotary valve f or use in such water heating apparatus, with parts thereof in different respective positions.
Figure 1 shows a heat exchanger 1, which is adapted to be heated by a burner 2 and is connected to a radiator system 5 by a flow line 3 and a return line 4. A three-way valve 6 provided with a solenoid actuator 7 is included in the flow line 3 and selectively opens or closes the flow path to a room heating water accumulator 8. When the flow path to the room heating water accumulator is closed, the flow will pass through the flow line to the radiator system 5.
The room heating water accumulator 8 is provided with heat insulation 19 and is thus effectively insulated against heat losses. The room heating water accumulator 8 may be provided with an additional heat source, the heat output of which is merely sufficient to compensate for 1 A such heat losses from the room heating water accumulator 8 as there are. This ensures that the water stored in the room heating water accumulator 8 will be held at a correspondingly high temperature.
The room heating water accumulator 8 is also connected to the inlet of the primary circuit of a tap water heat exchanger 9 and said inlet is also connected to a further three-way valve 10, which is included in the flow line 3 and is also provided with a solenoidactuator 11. The three-way valve 10 selectively opens the flow path to the tap water heat exchanger 9 or closes said flow path and simultaneously opens the flow path to the radiator system 5.
The outlet of the primary circuit of the tap water heat exchanger 9 is connected to the return line 4.
The secondary circuit of the tap water heat exchanger 9 is connected to a hot water tap 12. That tap acts on a control device 13 which, when the hot water tap 12 is opened, delivers a signal which initiates a predetermined control of the actuators 7 and 11 of the two three-way valves 6 and 10 in a predetermined sequence.
In response to the opening of the hot water tap 12 the three-way valve 6 is controlled to open the connection to the room heating water accumulator 8 and the valve 6 then remains open until a volume of water which corresponds to the volume V1 of water in the primary heat exchanger 1, the volume V2 of water in the lines leading 1 1 i i i i 1 f rom the primary heat exchanger 1 to the room heating water accumulator 8 and the volume V3 of water in the lines leading from the room heating water accumulator 8 to the return port of the primary heat exchanger 1, inclusive of the volume of water in the primary circuit of the tap water heat exchanger 9, has flowed into the room heating water accumulator 8. That water has been heated to the flow temperature of the radiator system 5 because the opening of the hot water tap 12 has initiated the operation of the burner 2 unless the burner had already been in operation owing to existing demands on the radiator system 5.
Thereafter the three-way valve 6 is controlled to shut off the flow to the room heating water accumulator 8 and to open the flow line 3, and the three-way valve 10 is simultaneously controlled to open the flow to the tap water heat exchanger 9 and to close the flow line 3. This will ensure a continued supply of room heating water to the primary circuit of the tap water heat exchanger 9.
When the tapping has been terminated, the threeway valve 10 is controlled to shut off the flow to the tap water heat exchanger 9 and to open the f low to the flow line leading to the radiator system 5. When water is not being tapped, the contents of the room heating water accumulator 14 are kept at a set temperature. For this purpose suitable automatic control technology is adopted to hold the valve 6 allowing a f low to the accumulator 8 and to start the burner 2. When the set temperature has been reached, the burner is shut down and the valve 6 is actuated to open the flow to the radiator system 5. The heating of the room heating water accumulator 8 may alternatively be effected independently of the burner 2 by a heat source which is preferably electrically operated.
The room-heating water is circulated by the pump 15, which is included in the return line betweeen the port of the heat exchanger 9 for water for consumption, and the primary heat exchanger 1.
Figure 1 also shows that the two three-way valves 6 and 10 are constituted by a control unit 20. The two three-way valves 6 and 10 are connected between a part of the line 3 which is nearer to the primary heat exchanger 1, and another part of the line 3 labelled a, nearer to the radiator system 5. The part a leads to the radiator system 5. The third ports of said two three-way valves 6 and 10 are connected respectively by line b to the inlet of the room heating water accumulator 8, and by line c to the outlet of said accumulator. The port which is connected to the line c is also connected by the line d to the inlet of the tap water heat exchanger 9.
The modification shown in Figure 2 differs from the one of Figure 1 only in that the control unit 20 comprises a -rotary valve 21 and its actuator 22. The rotary valve 21 has five ports, which, when considered in the clockwise sense, are connected to the lines 3,]2, 1, t i 1 i i i 1 i i 1 i i 4 c, and a, which just as in the apparatus illustrated in Figure 1 are connected to the various components, such as the primary heat exchanger 1, the room heating water accumulator 8, the tap water heat exchanger 9 and the radiator system 5.
As illustrated in Figures 3 to 6 the rotary valve 21 comprises a valve member 23, which is generally triangular in cross-section. A valve surface 24 extends close to the diameter of a housing 25 of the rotary valve 21, and a second valve face 26 defines a space in the housing 25 which may be in communication with two ports, which are angularly spaced apart by 900.
As a result, it is possible in one position (shown in Figure 3) to supply only the radiator system 5 from the primary heat exchanger 1, the remaining ports being short- circuited so that there is no through flow to the components which are connected to those remaining ports.
Figure 4 shows an intermediate position, in which the flow to the radiator system 5 is interrupted and the connection to the room heating water accumulator 8 is closed.
Figure 5 shows the rotary valve 21 in a position in which room heating water flows from the primary heat exchanger 1 through the room heating water accumulator 8 to the tap water heat exchanger 9. In that position only tap water is heated. That position is assumed directly - 12 tapping of water is initiated.
Figure 6 shows the rotary valve 21 in a position which will be assumed after tap water has been tapped during a start-up phase. The room heating water now flows from the primary heat exchanger 1 directly to the tap water heat exchanger 9 and the hot water which has flowed into the room heating water accumulator 8 remains in the latter.
1 S
Claims (12)
1. Water heating apparatus for heating room heating water and tap water, in which the apparatus comprises a primary heat exchanger adapted to be heated by a heat source and adapted to be selectively connected by valve means to at least one radiator or to a tap water heat exchanger, which is connected in parallel to the or each radiator and has a secondary circuit connected to a hot water tap, in which a room heating water accumulator is provided, which is adapted to hold water at a relatively high temperature by means of a thermostat and is connected to the primary heat exchanger by the valve means, which are also connected between the primary heat exchanger and the tap water heat exchanger, and in which the room heating water accumulator has an outlet which is connected to the inlet of the tap water heat exchanger, and a control device, which is responsive to tapping of hot water from the hot water tap, and is operatively connected to actuator means. preferably solenoid actuator means, for the valve means.
2. Apparatus according to claim 1, in which the valve means comprise a first three-way valve by which the primary heat exchanger can be selectively connected to the or each radiator or to the tap water heat exchanger, and a second three- way valve by which the primary heat exchanger is connected to the room heating water accumulator and is 4 14 also connected between the primary heat exchanger and the said first three-way valve, and in which the actuator means comprise respective actuators for the two threeway valves.
3. Apparatus according to claim 2, in which the said control device upon a beginning of a tapping operation first -controls the solenoid valve, which controls the supply of water to the room heating water accumulator, to connect the room heating water accumulator to the flow line from the primary heat exchanger, until a volume of water, corresponding to the total volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator, has flowed into the room heating water accumulator, whereafter the control device controls the solenoid valve for controlling the supply of water to the room heating water accumulator to shut off the supply to the room heating water accumulator and simultaneously controls the solenoid valve controlling the supply to the tap water heat exchanger to open the supply thereto until the end of the tapping operation.
4. Apparatus according to claim 2,in which the three-way valves are connected in series in a line which leads from the primary heat exchanger to the or each radiator, the third port of one three-way valve is connected to the tap water heat exchanger and the other three-way valve which is between the primary heat 1 1 i 1 1 1 1 1 1 i - is - exchanger and the first three-way valve is connected at its third port to the inlet of the room heating water accumulator, the outlet of which is connected to the inlet of the tap water heat exchanger.
5. Apparatus according to claim 2 or claim 4, in which the volume of water in the room heating water accumulator is at least as large as the total volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator.
6. Apparatus according to claim 4 or claim 5, in which the control device upon the beginning of a tapping operation first controls the supply of water to the room heating water accumulator so as to connect the room heating water accumulator t o the flow line from the primary heat exchanger and to connect the primary heat exchanger to the room heating circuit until a volume of water which corresponds to the total volume of water in the primary heat exchanger and in the lines leading to and from the room heating water accumulator, has flowed into the room heating water accumulator, and subsequently controls said supply so as to shut of f the supply to the room heating water accumulator and at the same time to open the supply to the tap water heat exchanger.
7. Apparatus according to any preceding claim, in 25 which the room heating water accumulator is provided with an effective heat-insulating layer.
8. Apparatus according to any preceding claim, in 1 1 1 which the room heating water accumulator is provided with an additional heater, which has a heat output that is sufficient substantially to compensate the heat losses from the room heating water accumulator.
9. Apparatus according to claim 1, in which the valve means comprise a rotary valve, which is connected to the primary heat exchanger, the or each radiator, the tap water heat exchanger and the inlet and outlet of the room heating water accumulator, and comprise a valve member which is substantially triagular in cross-section.
10. A rotary valve for use in water heating apparatus, particularly in a water heating apparatus according to claim 9, comprisng a substantially cylindrical housing and a valve member which is rotatably held in said housing, in which the housing is provided with four ports, which are angularly spaced apart at substantially 900 intervals, and an additional port, which is disposed between two of the said four ports, and in which the valve member has a valve surface extending between diametrically opposite ports of the rotary valve and an additional valve surface, which defines a space that is able to be in communication with two ports spaced 90 apart, and in which the valve member comprises sealing surfaces in contact with the inside surface of the housing of the rotary valve.
11. Water heating apparatus substantially as described herein with reference to and as shown in Figure 1 1 1 i i 1 i i j 1 1 or 2 of the accompanying drawings.
12. A rotary valve f or use in water heating apparatus, substantially as described herein with reference to and as shown in Figures 3 to 6 of the accompanying drawings.
1 Published 1992 at The Patent Office. Concept House. Cardiff Road. Newpori. Gwent NP9 I RH. Further copies may be obtained froni Sales Branch. Unit 6. Nine Mile Point. Cwrnfelinfach. Cross Keys. Newport, NPI 7HZ. Printed by Multiplex techniques lid. St Marv Cray. Kent
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0102890A AT396033B (en) | 1990-05-07 | 1990-05-07 | Heating apparatus for the heating of heating and service water |
| AT0037391A AT400078B (en) | 1991-02-22 | 1991-02-22 | Heating appliance for the heating of heating water and service water |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9109840D0 GB9109840D0 (en) | 1991-06-26 |
| GB2246849A true GB2246849A (en) | 1992-02-12 |
| GB2246849B GB2246849B (en) | 1994-06-01 |
Family
ID=25592511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9109840A Expired - Fee Related GB2246849B (en) | 1990-05-07 | 1991-05-07 | Water heating apparatus |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE1004890A6 (en) |
| CH (1) | CH684121A5 (en) |
| DE (1) | DE4114619C2 (en) |
| FR (1) | FR2661736B1 (en) |
| GB (1) | GB2246849B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0635682A1 (en) * | 1993-07-20 | 1995-01-25 | INTEGRA S.r.l. | Boiler of the so-called combined heat accumulation type |
| GB2266762B (en) * | 1991-09-05 | 1996-05-01 | Nicholas Julian Jan F Macphail | A system for providing mains pressure domestic hot water |
| GB2355751A (en) * | 1999-10-28 | 2001-05-02 | David Kenneth Bissmire | Scaffold guard having tensionable safety screen |
| CN116182227A (en) * | 2023-04-21 | 2023-05-30 | 汕头恒建热力有限公司 | Closed-loop heat conduction efficiency loss and compensation coordinated heating device and heating method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT400362B (en) * | 1991-11-04 | 1995-12-27 | Vaillant Gmbh | HEATER WITH A HEAT EXCHANGER INACTED BY A HEAT SOURCE |
| AT400629B (en) * | 1994-05-27 | 1996-02-26 | Vaillant Gmbh | Water heater |
| DE19739828A1 (en) | 1997-09-11 | 1999-03-18 | Bosch Gmbh Robert | Device for preparing heating water and process water |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE593181C (en) * | 1930-09-28 | 1934-02-22 | Ewald Mielke | Warm water heating and supply system with preheating of the consumption water by circulating heating water of the heating system in a heat exchanger |
| FR840798A (en) * | 1938-07-18 | 1939-05-03 | Multi-way valve for controlling a hot water heating installation, heated together with a separately operating installation, from a single boiler | |
| CH339726A (en) * | 1957-09-04 | 1959-07-15 | Cipag S A | Installation de chauffage central et de fourniture d'eau chaude de consommation |
| DE1679674A1 (en) * | 1966-06-29 | 1971-07-22 | Junkers & Co | Heat exchanger for preparing hot service water |
| DE2439310A1 (en) * | 1974-08-16 | 1976-03-11 | Rapido Dinsing Werk Gmbh | Heating system hot water preparation - has boiler water delivered to storage unit for radiators and heat exchanger supply |
| DE3322612A1 (en) * | 1982-07-02 | 1984-01-05 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Fuel-heated heat source |
| NL8600246A (en) * | 1986-01-31 | 1987-08-17 | Atag Bv Apparatenfab | Domestic heating circuit supplying tap water - has burner controlled by on-off cycle and restriction in circuit |
| AT389584B (en) * | 1988-04-15 | 1989-12-27 | Vaillant Gmbh | HEATING SYSTEM |
-
1991
- 1991-04-26 BE BE9100384A patent/BE1004890A6/en not_active IP Right Cessation
- 1991-04-30 FR FR919105441A patent/FR2661736B1/en not_active Expired - Fee Related
- 1991-04-30 DE DE4114619A patent/DE4114619C2/en not_active Expired - Fee Related
- 1991-05-01 CH CH1284/91A patent/CH684121A5/en not_active IP Right Cessation
- 1991-05-07 GB GB9109840A patent/GB2246849B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2266762B (en) * | 1991-09-05 | 1996-05-01 | Nicholas Julian Jan F Macphail | A system for providing mains pressure domestic hot water |
| EP0635682A1 (en) * | 1993-07-20 | 1995-01-25 | INTEGRA S.r.l. | Boiler of the so-called combined heat accumulation type |
| GB2355751A (en) * | 1999-10-28 | 2001-05-02 | David Kenneth Bissmire | Scaffold guard having tensionable safety screen |
| CN116182227A (en) * | 2023-04-21 | 2023-05-30 | 汕头恒建热力有限公司 | Closed-loop heat conduction efficiency loss and compensation coordinated heating device and heating method |
| CN116182227B (en) * | 2023-04-21 | 2023-07-14 | 汕头恒建热力有限公司 | Closed-loop heat conduction efficiency loss and compensation coordinated heating device and heating method |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2661736A1 (en) | 1991-11-08 |
| GB9109840D0 (en) | 1991-06-26 |
| DE4114619C2 (en) | 1997-02-13 |
| GB2246849B (en) | 1994-06-01 |
| CH684121A5 (en) | 1994-07-15 |
| FR2661736B1 (en) | 1993-08-06 |
| BE1004890A6 (en) | 1993-02-16 |
| DE4114619A1 (en) | 1991-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990507 |