GB2042710A - Control System for a Hot-water Heating Installation and Heating Installation Provided Therewith - Google Patents
Control System for a Hot-water Heating Installation and Heating Installation Provided Therewith Download PDFInfo
- Publication number
- GB2042710A GB2042710A GB7940376A GB7940376A GB2042710A GB 2042710 A GB2042710 A GB 2042710A GB 7940376 A GB7940376 A GB 7940376A GB 7940376 A GB7940376 A GB 7940376A GB 2042710 A GB2042710 A GB 2042710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- boiler
- temperature
- water
- control system
- thermostat
- 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 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 238000009434 installation Methods 0.000 title claims abstract description 26
- 238000005338 heat storage Methods 0.000 claims description 9
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 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
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/215—Temperature of the water before heating
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/335—Control of pumps, e.g. on-off control
-
- 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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
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
A hot-water heating installation with a boiler (1) adapted to be heated by a burner (2) has a delivery conduit (14) with a circulation pump (11) and a return conduit (15) whose water temperature is monitored by an adjustable thermostat (9). The operation of the boiler (1) is controlled by a control system which includes a control unit (4) and the thermostat (9). A time switch (5) is set to include the thermostat (9) in, and to exclude the control unit (4) from, the control circuit during periods of low demand such as at night time. The control unit (4) operates the boiler (1) in dependence on the ambient temperature sensed by an outside pick-up (6) whereas the thermostat (9) controls the boiler (1) so that the temperature of water in the return conduit (15) is as close as possible to a predetermined temperature, which is preferably room temperature. <IMAGE>
Description
SPECIFICATION
Control System for a Hot-water Heating
Installation and a Heating Installation Provided
Therewith
The present invention relates to a control system for a hot-water heating installation and to such an installation provided with the control system.
A heating installation with a heating boiler capable of being regulated in dependence on the outside temperature is already known from
German laid-open specification 25 28 749. This prior art specification shows how it is possible for the boiler water temperature to be continuously adapted to the particular prevailing outside temperature, whilst maintaining a lower minimum temperature dependent on the boiler material.
The heating installation disclosed includes an additional controller which is adapted to be included in the control system at night and which inhibits further supply of energy until the reduced night temperature is reached. Associated with the additional controller are a room thermostat and a timer or outside temperature sensor or pickup adjustable through the agency of the outside temperature. This known heating installation however does not take into account the water temperature in the return conduit so that it still does not necessarily allow any saving in energy.
It is an object of the present invention to provide a control system which can save energy in the operation of a hot-water heating installation by prolonging the periods in which a burner is inactive.
According to the present invention there is provided a control system for a hot-water heating installation having a boiler adapted to be heated by a burner, a return conduit for returning water to the boiler and at least one circulation pump, the control system including: a control unit adapted to control the temperature of water issuing from the boiler in dependence on the ambient temperature; and adjustable thermostat adapted to control the temperature of water issuing from the boiler in dependence on the temperature of the water in the return conduit; and a time switch adapted to include the thermostat in a circuit controlling the boiler and to exclude the control unit from the said circuit during set periods.
Preferably the thermostat is adapted to control the temperature of water issuing from the boiler so that the temperature of the water in the return conduit is substantially equal to room temperature. The set periods suitably correspond to periods of low demand such as during night time operation of the boiler during which long individual burner operating times can be achieved resulting in an overall reduction in the total burner operating time and consequently a considerable saving in energy. Each individual burner operating time can be prolonged by selecting the difference in temperatures at which the thermostat monitoring the temperature of the water in the return conduit responds (i.e. the two temperatures at which the burner is switched on and off respectively) to be greater than normal.
The control system of the present invention can thus operate the boiler in an energy saving manner, even during times of low demand.
The control system can further include a second adjustable thermostat and a relay, the thermostat being adapted to sense the temperature of heat storage means and by means of the relay to direct heat from the boiler to the heat storage means irrespective of the ambient temperature or of the temperature of water in the return conduit. The heat storage means can for example be a hot water dispenser or a storage heater, whose heating can have priority over the remainder of the heating installation.
The present invention extends to a heating installation including the control system of the present invention, a boiler adapted to be heated by a burner and associated with the said control system, a delivery conduit for carrying water issuing from the boiler a return conduit for returning water to the boiler and at least one circulation pump. The heating installation can be arranged to supply one or more heat consumers.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings; wherein Fig. 1 shows a control system and a hot-water heating installation embodying the present invention and including a weather-controlled delivery temperature control, with an economy circuit and return limitation arrangement; and
Fig. 2 shows a second embodiment of a control system and heating installation having a weathercontrolled delivery temperature control with economy circuit, return limitation arrangement and water heater priority circuit.
In Figs. 1 and 2, broken lines composed of short dashes are used to designate electrical connections and thick dots at points where these electrical connections intersect represent electrically conductive junctions.
Referring to Figs. 1 and ? a heating boiler 1 is adapted to be heated by an oil or gas burner 2 which is electrically connected to a boiler temperature controller 3.
A control unit 4 is sensitive to the ambient atmospheric conditions and is electrically connected to the boiler temperature controller 3.
A time switch 5 is electrically connected to the control unit 4, but is adjustable independently of and is separate from the control unit 4. An outside temperature pickup 6 is electrically connected to the control unit 4.
A delivery temperature pickup 7 monitors the delivery temperature of water in a delivery conduit 14 leading from the boiler 1 in dependence on the outside temperature. The delivery temperature pickup 7 is electrically connected to the control unit 4.
A return temperature pickup 8 monitors the temperature of water in a return conduit 1 5 leading to the boiler 1 and is electrically connected to the control unit 4. Associated with the return temperature pickup 8 is an adjustable return thermostat 9 which operates in the manner described below.
The electrical circuit also includes a relay 10, an electrical fuse 12, and a pump switch 13 which operates a circulation pump 12 in the delivery conduit 14. The arrow-heads in the conduits 14 and 1 5 indicate the direction of flow of the water. The relevant heat consuming system(s) or apparatus in each case is not shown.
Referring to Fig. 2 only, heat storage means 16, which can be a storage heater or a domestic hot water dispenser, is heated by a ribbed-tube heat exchanger 1 7 through which hot water is fed from the boiler 1.
A gravity check valve element 1 8 and a domestic water charging pump 1 9 are included in the conduit which leads from the boiler 1 to the heat exchanger 17.
Associated with the domestic water heater or storage heater 16 is a thermostat 20 and an electrical relay 21.
The operation of the embodiment illustrated in
Fig. 1 will now be described.
During day time operation, e.g. from 0600 to 2200 hours, the time switch 5 switches the mains voltage to the control unit 4. The delivery temperature, as measured by the pickup 7, of water issuing from the boiler 1 in the heating installation is controlled in dependence on the outside temperature as measured by the pickup 6.
The maximum load which the control unit 4 can be given is a current of 0.6 A. The relay 10 is thus provided to carry the starting-up current and switches the boiler on and off in dependence on the control unit 4. The boiler temperature controller 3 is set e.g. to 900 to 950C. The return temperature is limited by the return thermostat 9.
During night time operation, e.g. from 2200 hours to 0600 hours, the time switch 5 connects the mains voltage to the return thermostat 9. The thermostat 9 is sensitive to a temperature difference of e.g. about 7 K and is set to provide a minimum return temperature of e.g. 200C. If during the night the temperature of water in the return conduit 1 5 drops to 200C, the return thermostat 9 switches on the burner 2 through the agency of the boiler temperature controller 3.
The heating of the water passing through the boiler 1 amounts to for example about 15 to 20 K, so that at the beginning of a heating-up stage a delivery temperature of e.g. approximately 350 to 400C is achieved and at the end, when the thermostat 9 switches off the burner 2 by means of the temperature controller 3, a delivery temperature of e.g. approximately 420 to 470C is provided. The arrangement of the return thermostat 9 in the return conduit 1 5 also covers installation down times, and long burner operating times are achieved. Long burner operating times are determined by the switching difference of the return thermostat 9 which can be deliberately chosen to be greater than normal.
The heating system circulation pump 11 is switched on and off only by means of the pump switch 13 and runs continuously when the installation of Fig. 1 is in operation.
The method of operation of the embodiment illustrated in Fig. 2 will now be described.
The operation of the embodiment of Fig. 2 is similar to that described with respect to Fig. 1, but with the difference that the thermostat 20, which is set for example to a temperature of 600 C, operates independently of the particular state of the installation at any one time. When there is a need, the thermostat 20 switches on the boiler temperature controller 3 by means of the relay 21 and at the same time the charging pump 19 starts up, whilst by means of the pump switch (relay) 1 3 the heating system circulation pump 11 is switched off. The heating system circulation pump 11 is continuously in operation apart from interruptions caused by the priority circuit for the domestic water heater or storage heater.
Claims (9)
1. Control system for a hot-water heating installation having a boiler adapted to be heated by a burner, a return conduit for returning water to the boiler and at least one circulation pump, the control system including:
a control unit adapted to control the temperature of water issuing from the boiler in dependence on the ambient temperature;
an adjustable thermostat adapted to control the temperature of water issuing from the boiler in dependence on the temperature of the water in the return conduit; and
a time switch adapted to include the thermostat in a circuit controlling the boiler and to exclude the control unit from the said circuit during set periods.
2. Control system according to claim 1 wherein the thermostat is adapted to control the temperature of water issuing from the boiler so that the temperature of the water in the return conduit is substantially equal to room temperature.
3. Control system according to claim 1 or claim 2 wherein the set periods correspond to periods of low demand such as during night time operations of the boiler.
4. Control system according to any one of the preceding claims including a second adjustable thermostat and a relay, the thermostat being adapted to sense the temperature of heat storage means and by means of the relay to direct heat from the boiler to the heat storage means irrespective of the ambient temperature of the temperature of water in the return conduit.
5. Control system substantially as herein described with reference to Fig. 1 or Fig. 2 of the accompanying drawings.
6. Heating installation including a control system according to any one of the preceding claims, a boiler adapted to be heated by a burner and associated with the said control system, a delivery conduit for carrying water issuing from the boiler, a return conduit for returning water to the boiler and at least one circulation pump.
7. Heating installation according to claim 6 and as appendant on claim 4 further including heat storage means associated with the second thermostat.
8. Heating installation according to claim 7 including a charging pump for feeding water from the boiler to the heat storage means, the control system being adapted to actuate the said charging pump and to switch off the said circulation pump(s) whenever heat is directed from the boiler to the heat storage means.
9. Heating installation substantially as herein described with reference to Fig. 1 or Fig. 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2851728A DE2851728C2 (en) | 1978-11-30 | 1978-11-30 | Control system for a hot water heating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2042710A true GB2042710A (en) | 1980-09-24 |
| GB2042710B GB2042710B (en) | 1983-02-16 |
Family
ID=6055889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7940376A Expired GB2042710B (en) | 1978-11-30 | 1979-11-22 | Control system for a hot-water heating installation and heating installation provided therewith |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2851728C2 (en) |
| FR (1) | FR2443028A1 (en) |
| GB (1) | GB2042710B (en) |
| IT (1) | IT1126428B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002050476A1 (en) * | 2000-12-18 | 2002-06-27 | Rheem Australia Pty Ltd | Thermostat system to provide adaptive control of water temperature |
| EP1085269A3 (en) * | 1999-09-15 | 2003-01-29 | Robert Bosch Gmbh | Arrangement for the adjustment of a heater to the actual heat requirement |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2542852B1 (en) * | 1983-03-14 | 1988-10-14 | Comp Generale Electricite | DEVICE FOR REGULATING THE HEATING OR AIR CONDITIONING OF A LIVING ROOM, AND METHOD FOR IMPLEMENTING THE DEVICE |
| DE102004015153A1 (en) * | 2004-03-27 | 2005-10-27 | Honeywell B.V. | Method for functional testing of a pump motor, in particular a pump motor integrated in a heating direction |
| CN112197439B (en) * | 2020-10-09 | 2021-10-26 | 珠海格力电器股份有限公司 | Gas water heater control method, device and system and gas water heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2452515A1 (en) * | 1974-11-06 | 1976-05-13 | Burger Eisenwerke Ag | Circulation pump control in heating systems - has pump switched on and off by two-way thermostat dependent on heat load |
| DE2528749A1 (en) * | 1975-06-27 | 1977-01-13 | Buderus Eisenwerk | HEATING SYSTEM WITH A HEATING BOILER THAT CAN BE CONTROLLED DEPENDING ON THE OUTSIDE TEMPERATURE |
-
1978
- 1978-11-30 DE DE2851728A patent/DE2851728C2/en not_active Expired
-
1979
- 1979-11-22 GB GB7940376A patent/GB2042710B/en not_active Expired
- 1979-11-27 FR FR7929163A patent/FR2443028A1/en active Granted
- 1979-11-29 IT IT27715/79A patent/IT1126428B/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1085269A3 (en) * | 1999-09-15 | 2003-01-29 | Robert Bosch Gmbh | Arrangement for the adjustment of a heater to the actual heat requirement |
| WO2002050476A1 (en) * | 2000-12-18 | 2002-06-27 | Rheem Australia Pty Ltd | Thermostat system to provide adaptive control of water temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2443028B3 (en) | 1981-08-14 |
| IT7927715A0 (en) | 1979-11-29 |
| FR2443028A1 (en) | 1980-06-27 |
| GB2042710B (en) | 1983-02-16 |
| DE2851728C2 (en) | 1982-10-07 |
| DE2851728A1 (en) | 1980-06-04 |
| IT1126428B (en) | 1986-05-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |