IE892024A1 - "A domestic water heating assembly" - Google Patents
"A domestic water heating assembly"Info
- Publication number
- IE892024A1 IE892024A1 IE202489A IE202489A IE892024A1 IE 892024 A1 IE892024 A1 IE 892024A1 IE 202489 A IE202489 A IE 202489A IE 202489 A IE202489 A IE 202489A IE 892024 A1 IE892024 A1 IE 892024A1
- Authority
- IE
- Ireland
- Prior art keywords
- heat exchanger
- assembly
- domestic
- domestic water
- water
- Prior art date
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
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
-
- 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
- F24D3/00—Hot-water central heating systems
- F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
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)
- Water Supply & Treatment (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
A domestic water heating assembly (1) for mounting at a conventional domestic hot water storage cylinder (2) to heat water stored in the cylinder (2). The heating assembly (1) has a plate heat exchanger (3) having a primary side (4) with a primary inlet (7) and a primary outlet (8) for circulation of a heating fluid, preferably from a domestic central heating system, through the primary side (4) of the heat exchanger (3). A secondary side (9) of the heat exchanger (3) has a secondary inlet (10) and a secondary outlet (11) both of which are connected to the cylinder (2) for circulating water with a pump (20) between the cylinder (2) and secondary side (9) of the heal exchanger (3) to heat the water for domestic use. Operation of the pump (20) is thermostatically controlled.
Description
This invention relates to a domestic water heating assembly and in particular to a heating assembly for heating water stored in a hot water storage cylinder of a domestic water heating system.
The term domestic water heating system as used in this Specification is taken to mean not only a household water heating system, but also water heating systems used in hotels, office blocks, public sports facilities such as football clubs and the like.
Many domestic water heating systems include a hot water storage cylinder from which hot water is drawn off as required for use. Cold water delivered to the cylinder is generally heated either by a heating coil in the tank through which hot water from a central heating system is passed or alternatively by an electric heating coil in the cylinder. A drawback with these heating systems is the relatively long period of time required to heat cold water in the cylinder to a suitable temperature.
It is an object of this invention to overcome this problem.
- 2 According to the invention there is provided a domestic water heating assembly comprising a high heat transfer rate type heat exchanger, the heat exchanger having a primary side with a primary inlet and a primary outlet for circulation of a heating fluid through the primary side of the heat exchanger and a secondary side with a secondary inlet and a secondary outlet for circulation of domestic water through the secondary side of the heat exchanger to heat the water for domestic use. Preferably the heat exchanger is a plate type heat exchanger.
In one embodiment of the invention the plate heat exchanger comprises a plurality of heat exchange plates fixedly mounted and sealed together.
In another embodiment the secondary outlet of the heat exchanger is connected to a domestic hot water storage cylinder for storage of domestic water heated in the heat exchanger. Preferably the secondary inlet of the heat exchanger is connected to a domestic hot water storage cylinder for circulating water between the storage cylinder and the secondary side of the heat exchanger.
In a further embodiment the heat exchanger is mounted externally of a domestic hot water storage cylinder.
- 3 In another embodiment the assembly has pump means for circulation of domestic water through the secondary side of the heat exchanger. Preferably the pump means is mounted upstream of the secondary inlet of the heat exchanger. In another embodiment the assembly includes a domestic water temperature control means to control circulation of domestic water through the secondary side of the heat exchanger. The domestic water temperature control means may comprise a water temperature sensing means to control the operation of a pump means connected to a secondary side of the heat exchanger. Ideally the domestic water temperature sensing means is mounted upstream of the secondary inlet of the heat exchanger.
In a further embodiment a domestic water flow control valve is provided to regulate the flow of domestic water through the secondary side of the heat exchanger. Preferably the domestic water flow control valve is mounted downstream of the secondary outlet of the heat exchanger.
In another embodiment heating fluid temperature sensing means is provided to control operation of the domestic water temperature sensing means in response to sensed heating fluid temperature. Typically the heating fluid temperature sensing means is mounted upstream of the primary inlet of the heat exchanger.
- 4 In another embodiment the assembly comprises two or more associated interconnected heat exchangers. The heat exchangers may be connected either in series or in parallel. In a particularly preferred embodiment the heating fluid is supplied from a domestic central heating system, the primary side of the heat exchanger being connected to the domestic central heating system. Alternatively a heating circuit may be provided having means to heat the heating fluid and means to circulate the heating fluid through the primary side of the heat exchanger.
In another aspect the invention provides a domestic water heating system incorporating a heating assembly as previously described.
In another aspect the invention provides a method of heating 15 domestic water, the method comprising delivering the domestic water through a secondary side of a high heat transfer rate type heat exchanger and passing a heating fluid through a primary side of the heat exchanger to heat the domestic water.
Preferably the heat exchanger is a plate type heat exchanger.
The invention will be more clearly understood from the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings, in which;
- 5 Fig. 1 is a perspective view of a water heating assembly according to the invention,
Fig. 2 is a diagrammatic illustration of the heating assembly, in use,
Fig. 3 is a wiring diagram for the heating assembly, and
Fig. 4 is a diagrammatic illustration similar to Fig. 2 showing an alternative arrangement of the heating assembly.
Referring to the drawings and initially to Figs. 1 to 3 thereof, there is illustrated a domestic water heating assembly according to the invention indicated generally by the reference numeral 1 for heating water stored in a conventional domestic hot water storage cylinder 2 of a domestic water heating system. The heating assembly 1 has a plate type heat exchanger 3 comprising a plurality of corrugated metal heat exchange plates sandwiched together and brazed around a periphery of the plates to fixedly mount and seal the plates together. A primary side 4 of the heat exchanger 3 has a primary inlet 7 and a primary outlet 8. A secondary side 9 of the heat exchanger 3 has a secondary inlet 10 and a secondary outlet 11. Means to circulate domestic water from the cylinder 2 through the secondary side 9 of the heat exchanger 3 comprises a supply pipe 15 for connection between
- 6 a cylinder outlet 16 at a lower end of the cylinder 2 and the secondary inlet 10, and a return pipe 17 for connection between the secondary outlet 11 and a cylinder inlet 18 adjacent a top of the cylinder 2. A domestic water flow control valve 19 is mounted in the return pipe 17.
An electrically driven pump 20 is mounted upstream of the secondary inlet 10 of the heat exchanger 3 in the supply pipe 15. It will be noted that the pump 20 is of bronze material.
A domestic water thermostat 22 to sense domestic water temperature is mounted on the supply pipe 15 upstream of the pump 22. The domestic water thermostat 22 controls operation of the pump 20, switching on the pump 20 when the temperature of water in the supply pipe 15 is below a preset value and switching off the pump 20 when the water temperature reaches a preset maximum value, in this case 50°C. Power to operate the domestic water thermostat 22 is controlled by a heating water thermostat 23, mounted at the primary inlet 7 of the heat exchanger 3, the heating water thermostat 23 supplies power to the domestic water thermostat 22 only if the temperature of heating water at the primary inlet 7 is above a preset value, for example, 55°C.
A domestic hot water discharge line 30 leads from a top of the cylinder 2 in conventional fashion to taps 31 and the like. An expansion pipe 32 is also provided.
- 7 In use, the heater assembly 1 is mounted at a domestic hot water storage cylinder 2, as shown in Figs. 1 and 2. The supply pipe 15 is connected to the cylinder outlet 16 and the return pipe 17 is connected to the cylinder inlet 18. A heating water supply pipe 24 from a domestic central heating system (not shown) is connected to the primary inlet 7 and a heating water return pipe 25 of the central heating system is connected to the primary outlet 8 of the heat exchanger 3.
To heat water in the cylinder 3 with the central heating 10 system switched on heating water is circulated through the primary side 4 of the heat exchanger 3. When the temperature of the heating water at the primary inlet 7 reaches 55°C the heating water thermostat 23 supplies power to the domestic water thermostat 22. If the temperature of the water in the supply pipe 15 is below a preset value the domestic water thermostat 22 switches on the pump 20. Domestic water is circulated by the pump 20 through the secondary side 9 of the heat exchanger 3, the domestic water being drawn from the cylinder outlet 16 through the pump 20, then through the secondary side 9 of the heat exchanger 3 and returned through the control valve 19 to the cylinder inlet 18. The control valve 19 can be adjusted to regulate the rate of flow of domestic water through the secondary side 9 of the heat exchanger 3, thus controlling the temperature rise of the domestic water as it passes through the heat exchanger 3.
- 8 Domestic water stored in the cylinder 2 is rapidly heated by the heat exchanger 3 and when the temperature of the domestic water in the supply pipe 15 at the domestic water thermostat 22 reaches the preset maximum value, in this case 50°C, the domestic water thermostat 22 switches off the pump 20. As heat is no longer being drawn from the primary side 4, the central heating system will switch off unless it is required for heating water for radiators of the central heating system.
It will be appreciated that the plate type heat exchanger 3 10 allows the water within the cylinder 2 to be rapidly heated.
Many variations to the embodiment described will be readily apparent. For example, in some cases a pump may not be provided with the heater, the thermal currents created within the heat exchanger 3 being sufficient to circulate water through the heating assembly. Also valve means may be provided to control the supply of heating water to the primary side 4 of the heat exchanger 3, the valve means shutting off the heating water supply from the central heating system when the water in the cylinder 2 has reached the desired temperature.
The heat source need not necessarily be a domestic central heating system. For example the heat source may comprise a separate closed heating circuit comprising for example a boiler and associated pump to circulate heating water through
- 9 the boiler and through the primary side 4 of the heat exchanger 3. This arrangement may be particularly suitable for use in hotels and in public sports facilities such as gymnasiums, football clubs and the like.
Referring now to Fig. 4 the heating assembly 1 is illustrated diagrammatically again in use in an alternative arrangement for heating water in the cylinder 2. In this case domestic water from the cylinder 2 is passed through the heat exchanger 3 and is returned through the domestic water flow control valve 19 and by way of the expansion pipe 32 to the top of the cylinder 20.
It will be appreciated that in some cases the heating assembly may comprise a number of the heat exchangers arranged in series or in parallel.
Further the heating assembly may be provided either instead of or in addition to conventional heating coil or immersion type heaters for a domestic hot water storage cylinder.
The heating assembly may be of any suitable materials of construction, however, iron or steel components which would rust and discolour the water are not used.
The invention is not limited to the embodiments hereinbefore described which may be varied in both construction and detail.
Claims (23)
1. A domestic water heating assembly comprising a high heat transfer rate type heat exchanger, the heat exchanger having a primary side with a primary inlet and a primary 5 outlet for circulation of a heating fluid through the primary side of the heat exchanger and a secondary side with a secondary inlet and a secondary outlet for circulation of domestic water through the secondary side of the heat exchanger to heat the water for domestic use. 10
2. An assembly as claimed in claim 1 wherein the heat exchanger is a plate type heat exchanger.
3. An assembly as claimed in claim 2 wherein the plate heat exchanger comprises a plurality of heat exchange plates fixedly mounted and sealed together. 15
4. An assembly as claimed in any preceding claim wherein the secondary outlet of the heat exchanger is connected to a domestic hot water storage cylinder for storage of domestic water heated in the heat exchanger. - 11 5. An assembly as claimed in claim 4 wherein the secondary inlet of the heat exchanger is connected to a domestic hot water storage cylinder for circulating water between the storage cylinder and the secondary side of the heat
5. Exchanger.
6. An assembly as claimed in claim 4 or claim 5 wherein the heat exchanger is mounted externally of a domestic hot water storage cylinder.
7. . An assembly as claimed in any preceding claim having pump 10 means for circulation of domestic water through the secondary side of the heat exchanger.
8. An assembly as claimed in claim 7 wherein the pump means is mounted upstream of the secondary inlet of the heat exchanger. 15
9. . An assembly as claimed in any preceding claim wherein the assembly includes a domestic water temperature control means to control circulation of domestic water through the secondary side of the heat exchanger.
10. An assembly as claimed in claim 9 wherein the domestic 20 water temperature control means comprises a domestic water temperature sensing means to control the operation - 12 of a pump means connected to the secondary side of the heat exchanger.
11. An assembly as claimed in claim 10 wherein the domestic water temperature sensing means is mounted upstream of 5 the secondary inlet of the heat exchanger.
12. An assembly as claimed in any preceding claim wherein a domestic water flow control valve is provided to regulate the flow of domestic water through the secondary side of the heat exchanger. 10
13. An assembly as claimed in claim 12 wherein the domestic water flow control valve is mounted downstream of the secondary outlet of the heat exchanger.
14. An assembly as claimed in any preceding claim wherein heating fluid temperature sensing means is provided to 15. Control operation of the domestic water temperature sensing means in response to sensed heating fluid temperature.
15. An assembly as claimed in claim 14 wherein the heating fluid temperature sensing means is mounted upstream of 20 the primary inlet of the heat exchanger. - 13
16. An assembly as claimed in any preceding claim comprising two or more associated interconnected heat exchangers.
17. An assembly as claimed in claim 16 wherein the heat exchangers are connected in series. 5
18. An assembly as claimed in claim 16 wherein the heat exchangers are connected in parallel.
19. An assembly as claimed in any preceding claim wherein the heating fluid is supplied from a domestic central heating system, the primary side of the heat exchanger being 10 connected to the domestic central heating system.
20. An assembly as claimed in any of claims 1 to 18 wherein a heating circuit is provided having means to heat the heating fluid and means to circulate the heating fluid through the primary side of the heat exchanger. 15
21. An assembly substantially as hereinbefore described with reference to the accompanying drawings.
22. A domestic water heating system incorporating an assembly as claimed in any of claims 1 to 21.
23. A method of heating domestic water, the method comprising 20 delivering the domestic water through a secondary side of - 14 a high heat transfer rate type heat exchanger, and passing a heating fluid through a primary side of the heat exchanger to heat the domestic water.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE202489A IE64054B1 (en) | 1989-06-22 | 1989-06-22 | A domestic water heating assembly |
GB9013846A GB2234337B (en) | 1989-06-22 | 1990-06-21 | A domestic water heating assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE202489A IE64054B1 (en) | 1989-06-22 | 1989-06-22 | A domestic water heating assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
IE892024A1 true IE892024A1 (en) | 1991-06-19 |
IE64054B1 IE64054B1 (en) | 1995-06-28 |
Family
ID=11032343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE202489A IE64054B1 (en) | 1989-06-22 | 1989-06-22 | A domestic water heating assembly |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2234337B (en) |
IE (1) | IE64054B1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2699652B1 (en) * | 1992-12-21 | 1995-01-27 | Certia | Method and device for producing hot water under high pressure, in particular for the stripping of building facades. |
IT1271978B (en) * | 1993-03-05 | 1997-06-10 | Giannoni Srl | PLATE EXCHANGER GROUP CONTROL DEVICE AND RELATED EXCHANGER. |
GB2293438A (en) * | 1994-09-20 | 1996-03-27 | Gledhill Water Storage | The control of water heating apparatus to prevent scalding |
GB9522102D0 (en) * | 1995-10-28 | 1996-01-03 | Gledhill Water Storage | Improvements relating to heating apparatus |
GB2369877A (en) * | 2000-12-07 | 2002-06-12 | Steven Caffall Finch | Hot water supply systems |
DE10304682B4 (en) * | 2003-02-05 | 2005-12-22 | Wolf Gmbh | Stratified storage tank with return temperature control |
EP2413047B2 (en) * | 2010-07-30 | 2021-11-17 | Grundfos Management A/S | Domestic water heating unit |
GB201215072D0 (en) * | 2012-08-23 | 2012-10-10 | Thermal Integration Ltd | Fluid heating and storage |
CN108534364A (en) * | 2018-06-02 | 2018-09-14 | 万家乐热能科技有限公司 | A kind of burnt gas wall hanging furnace of band heating and the monitoring of domestic hot-water supply water flow |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB328548A (en) * | 1928-12-24 | 1930-04-24 | Lewis Lee Ransom | Improvements in or relating to methods of and apparatus for heating liquids |
GB960010A (en) * | 1961-05-12 | 1964-06-10 | Ernest Henry Porter | Improvements in or relating to domestic hot-water systems |
FR1520519A (en) * | 1967-02-09 | 1968-04-12 | Fonderie Soc Gen De | Sophisticated installation for the production of domestic hot water |
GB2028986B (en) * | 1978-08-22 | 1982-12-01 | Imi Rycroft Ltd | Water heaters |
FR2468074A1 (en) * | 1979-10-23 | 1981-04-30 | Omnium Tech Etu Const Equip | Production of hot water using heat pump - utilises low grade heat from building ventilation system which is circulated through heating circuit of hot water storage cylinder |
EP0155855A2 (en) * | 1984-03-23 | 1985-09-25 | Braemar Appliances Pty. Ltd. | Improvements relating to gas water heaters |
US4738394A (en) * | 1987-02-20 | 1988-04-19 | Carrier Corporation | Integral liquid-backed gas-fired space heating and hot water system |
FR2615275B1 (en) * | 1987-05-13 | 1989-08-04 | Barriquand | METHOD AND DEVICE FOR INSTANT PREPARATION OF DOMESTIC HOT WATER |
-
1989
- 1989-06-22 IE IE202489A patent/IE64054B1/en not_active IP Right Cessation
-
1990
- 1990-06-21 GB GB9013846A patent/GB2234337B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
GB2234337A (en) | 1991-01-30 |
GB9013846D0 (en) | 1990-08-15 |
IE64054B1 (en) | 1995-06-28 |
GB2234337B (en) | 1993-09-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK9A | Patent expired |