WO2008071970A1 - A heating system - Google Patents
A heating system Download PDFInfo
- Publication number
- WO2008071970A1 WO2008071970A1 PCT/GB2007/004777 GB2007004777W WO2008071970A1 WO 2008071970 A1 WO2008071970 A1 WO 2008071970A1 GB 2007004777 W GB2007004777 W GB 2007004777W WO 2008071970 A1 WO2008071970 A1 WO 2008071970A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- burner
- burners
- valve
- splitter valve
- fan
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
- F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
- F23L13/02—Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/04—Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements
- F23N3/042—Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements using electronic means
-
- 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
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/02—Controlling two or more burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/10—High or low fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/04—Heating water
-
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/04—Gas or oil fired boiler
- F24D2200/043—More than one gas or oil fired boiler
Definitions
- the present invention relates to a heating system.
- Heating systems used for the domestic market i.e., to provide central heating and hot water requirements
- Larger heat exchangers for the adjacent market small commercial and multi-occupancy residential buildings
- Boilers for this adjacent market therefore tend to command significantly higher prices.
- One of the reasons for this is that it is not straightforward simply to "gang" several domestic boilers into a single flue and a single gas/air supply.
- the straightforward "adjacent mounting" of two boilers in parallel involves duplication of essentially all of the components of a single mounting.
- a heating system for heating a fluid comprising: two separate heat exchangers, each directly heated by a burner to heat the fluid; a common flue into which the two burners are arranged to discharge their exhaust gas; a common fan arranged to supply air to the two burners ; a gas supply to each burner; a splitter valve to split the air flow from the fan to the two burners; and a controller to control the speed of the fan, the position of the splitter valve and the gas supplies according to the heat output requirement of the system.
- the controller is programmed to compensate for the back flow for any given combination of fan speed and splitter valve position.
- the splitter valve may be movable through a number of discrete positions to provide a number of discrete flow levels. However, preferably, the splitter valve is continuously variable over a range of positions. This provides greater control over the split of the streams.
- the splitter valve is of a type in which there is a substantially linear relationship between the position of a valve element and the ratio of fluid diverted to two streams.
- a valve is described in our earlier WO 2004/081362. This provides the advantage that a more robust flow control is provided across the range of movement of the valve.
- the controller which controls the gas supply may do so directly, for example, using a dedicated valve in the gas line, or may do so indirectly, for example, using the speed of the fan to draw a controlled amount of gas into a venturi. In this second case, a valve would still be required in each gas supply to shut the gas supply off.
- the valve may be a movable vane such as that described in WO 2004/081362.
- it may comprise an inlet; two outlets, one for each burner; an outer sleeve having two first outlet orifices, one for each stream; an inner element movably retained within the outer sleeve and having an inlet and two second outlet orifices, one for each stream; wherein the relative proportion of the inlet stream fed to each outlet is determined by the relative position of the inner element and outer sleeve.
- This arrangement is more robust than a rotatable vane as it does not work directly against the direction of flow in its extreme positions. Also, it is particularly suited to being able to provide the linear relationship between the valve position and flow as mentioned above.
- a valve of this type is disclosed in WO 2004/085893.
- An improved valve of this type including a laminarising plate, ramp surface, tapered outlet orifice, bleed hole and annular seal is disclosed in WO 2006/035238 and would also be suitable for use.
- the gas supply may be introduced upstream of the splitter valve.
- Such an arrangement requires relatively few components, but does not allow independent control of the gas supply, other than by varying the position of the splitter valve. Therefore, preferably, gas is supplied to each burner downstream of the splitter valve. This allows a further degree of control of the gas supplied to each burner .
- the principle may apply to more than two separate heat exchangers, each being heated by a burner.
- there may be a single splitter valve which is able to split the flow into more than two streams such as that disclosed in WO 2004/085893.
- Fig. 1 is a schematic view of the heating system
- Fig. 2 is a perspective view of an outer sleeve of a splitter valve
- Fig. 3 is a similar perspective view of an inner sleeve of a splitter valve
- Fig. 4 is a graphical representation of an output profile of the inner sleeve for a valve suitable for use in the system of Fig. 1.
- the heating system comprises a first burner 1 and a second burner 2. Air to the burners is supplied from a single fan 3. This stream is split in a splitter valve 4 (described in greater detail below) . Combustible gas is added to each of the air streams at gas Venturis 5 under the control of respective valves 5A. Alternatively, it may be added via a single gas venturi upstream of the splitter valve 4.
- the burners 1 / 2 each provide heat to respective heat exchangers 7, 8 which may be arranged in series or in parallel.
- the heat exchangers carry a recipient fluid which receives heat from the burners 1, 2.
- the exhaust gases from the two burners 1, 2 are combined into a common flue 9.
- Fig. 2 shows an outer sleeve 20 while Fig. 3 shows an inner sleeve 30 which, in use, is rotatably received within outer sleeve 20.
- Outer sleeve 20 has a screw threaded connection 21 which provides an inlet port in communication with the fan 3.
- Two similar screw threaded ports 22 and 23 corresponding to first 24 ' and second 25 outlets provide a connection for ducts leading to the two burners 1,2.
- the two outlets 24,25 are spaced axially along the sleeve and are both on the same side of the sleeve although they could be circumferentially offset.
- Each outlet has a first outlet orifice 26,27 which is an axially extending elongate rectangular through aperture in the wall of the outer sleeve 20.
- Fig. 3 the inner sleeve 30 is shown.
- the sleeve is hollow and has an inlet 31 at the end corresponding to the inlet port 21 to receive air from the fan 3.
- Second outlet orifices 32,33 are elongate and are shown schematically to be generally triangular through orifices in the wall of the outer sleeve 30.
- the detail of the first and second outlet orifices 32, 33 is shown in Fig. 4.
- a gas seal (not shown) is provided in an annular groove 34 in the outer wall of the inner sleeve 30 between the second outlet orifices. This prevents flow from one outlet to the other between the outer 20 and inner 30 sleeves.
- the inner sleeve 30 has a spindle 35 axially extending from the end opposite to the inlet 31. This is connected to a motor (not shown) allowing the inner sleeve 30 to be rotated about axis 36. Alternatively, rotation of the inner sleeve could be effected by a solenoid/electro-magnet contained within the outer sleeve 20. This latter option would enable the valve to be self-contained and therefore suitable for use with a fuel/air mixture which would allow the splitter valve 4 to be used downstream of the gas entry- point, rather than upstream as shown in Fig. 1.
- the exact relationship is determined functionally to ensure that there is, as nearly as possible, a linear relationship between the rotational position of the inner sleeve 30 and the outlet flow.
- the first and second orifices could be swapped, such that the rectangular orifice was provided on the inner sleeve and the non-rectangular orifice was provided on the outer sleeve.
- both orifices can be provided with a non-rectangular shape.
- the precise control provided by the splitter valve 4 allows for a high level of modulation of each burner, and thus a high "turn-down" ratio of the complete appliance, without significant loss of efficiency of the system. These results can be achieved whilst using mass-produced heat- exchanger components so that the system can be produced cheaply. Further, since the burners 1, 2 can be arranged to alternately fire on successive occasions when only 1 burner is required, the life of the system can be enhanced.
- Periods of high demand (e.g. warming a large central heating system up from cold) : the fan 3 would be on a high setting, and the splitter valve 4 would have both outlet ports fully open. With the valve configuration shown in Fig. 4 the valve would be set to the 180° position. Both burners 1, 2 would run at maximum rating, and the overall appliance would provide the (maximum) thermal output - in this example 72kW.
- Periods of moderate, but constant, demand which is above the rating of a single heat exchanger, say 60% of maximum rating, or 43.2kW.
- the fan 3 would be set to 60% of the maximum flow, and the splitter valve 4 would be set to a 50:50 ratio (e.g. at 180° orientation as shown in Fig. 4) . It is noteworthy that in this operation mode, both burners are operating at 60% efficiency.
- the splitter valve 4 could be positioned such that Output 1 is fully open, and Output 2 is approximately 20% open (this corresponds to an orientation of about 100° in Fig. 4) .
- burner 1 is operating at its maximum rating
- burner 2 (36kW) , and burner 2 at 20% of its rating (i.e., at 7.2Kw).
- the decision whether to operate under the first or second of these conditions will depend on the efficiency characteristics of the burners. It is well established that burners (with their heat exchangers) are generally less efficient at lower operating conditions. Whether it is more efficient to operate one burner fully and the other at a significantly reduced level, or to operate both at a partially reduced level, will depend on the details of each burner. However, the system allows for full control, and thus choice between the two.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Feeding And Controlling Fuel (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/448,145 US20100043727A1 (en) | 2006-12-14 | 2007-12-13 | Heating system |
JP2009540856A JP2010513831A (en) | 2006-12-14 | 2007-12-13 | Heating system |
EP07848521A EP2092182A1 (en) | 2006-12-14 | 2007-12-13 | A heating system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0624945.2 | 2006-12-14 | ||
GBGB0624945.2A GB0624945D0 (en) | 2006-12-14 | 2006-12-14 | A heating system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008071970A1 true WO2008071970A1 (en) | 2008-06-19 |
Family
ID=37712120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2007/004777 WO2008071970A1 (en) | 2006-12-14 | 2007-12-13 | A heating system |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100043727A1 (en) |
EP (1) | EP2092182A1 (en) |
JP (1) | JP2010513831A (en) |
KR (1) | KR20090125034A (en) |
GB (1) | GB0624945D0 (en) |
WO (1) | WO2008071970A1 (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011002653A1 (en) * | 2009-06-29 | 2011-01-06 | David Deng | Dual fuel heating system and air shutter |
US8851065B2 (en) | 2010-06-07 | 2014-10-07 | David Deng | Dual fuel heating system with pressure sensitive nozzle |
US8985094B2 (en) | 2011-04-08 | 2015-03-24 | David Deng | Heating system |
US9091431B2 (en) | 2012-09-13 | 2015-07-28 | David Deng | Dual fuel valve with air shutter adjustment |
US9200801B2 (en) | 2007-03-14 | 2015-12-01 | Procom Heating, Inc. | Fuel selection valve assemblies |
US9328922B2 (en) | 2006-12-22 | 2016-05-03 | Procom Heating, Inc. | Valve assemblies for heating devices |
US9416977B2 (en) | 2006-05-17 | 2016-08-16 | Procom Heating, Inc. | Heater configured to operate with a first or second fuel |
US9423123B2 (en) | 2013-03-02 | 2016-08-23 | David Deng | Safety pressure switch |
US9441840B2 (en) | 2010-06-09 | 2016-09-13 | David Deng | Heating apparatus with fan |
US9671111B2 (en) | 2013-03-13 | 2017-06-06 | Ghp Group, Inc. | Fuel selector valve with shutter mechanism for a gas burner unit |
US9739389B2 (en) | 2011-04-08 | 2017-08-22 | David Deng | Heating system |
US9752779B2 (en) | 2013-03-02 | 2017-09-05 | David Deng | Heating assembly |
US9752782B2 (en) | 2011-10-20 | 2017-09-05 | David Deng | Dual fuel heater with selector valve |
US9829195B2 (en) | 2009-12-14 | 2017-11-28 | David Deng | Dual fuel heating source with nozzle |
US10073071B2 (en) | 2010-06-07 | 2018-09-11 | David Deng | Heating system |
US10222057B2 (en) | 2011-04-08 | 2019-03-05 | David Deng | Dual fuel heater with selector valve |
US10240789B2 (en) | 2014-05-16 | 2019-03-26 | David Deng | Dual fuel heating assembly with reset switch |
US10429074B2 (en) | 2014-05-16 | 2019-10-01 | David Deng | Dual fuel heating assembly with selector switch |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9746176B2 (en) | 2014-06-04 | 2017-08-29 | Lochinvar, Llc | Modulating burner with venturi damper |
US11735628B2 (en) * | 2021-03-01 | 2023-08-22 | International Business Machines Corporation | Nanosheet metal-oxide semiconductor field effect transistor with asymmetric threshold voltage |
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2006
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-
2007
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- 2007-12-13 JP JP2009540856A patent/JP2010513831A/en active Pending
- 2007-12-13 EP EP07848521A patent/EP2092182A1/en not_active Withdrawn
- 2007-12-13 US US12/448,145 patent/US20100043727A1/en not_active Abandoned
- 2007-12-13 KR KR1020097012210A patent/KR20090125034A/en not_active Application Discontinuation
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Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9416977B2 (en) | 2006-05-17 | 2016-08-16 | Procom Heating, Inc. | Heater configured to operate with a first or second fuel |
US10066838B2 (en) | 2006-05-30 | 2018-09-04 | David Deng | Dual fuel heating system |
US9140457B2 (en) | 2006-05-30 | 2015-09-22 | David Deng | Dual fuel heating system and air shutter |
US9328922B2 (en) | 2006-12-22 | 2016-05-03 | Procom Heating, Inc. | Valve assemblies for heating devices |
US9581329B2 (en) | 2007-03-14 | 2017-02-28 | Procom Heating, Inc. | Gas-fueled heater |
US9200801B2 (en) | 2007-03-14 | 2015-12-01 | Procom Heating, Inc. | Fuel selection valve assemblies |
WO2011002653A1 (en) * | 2009-06-29 | 2011-01-06 | David Deng | Dual fuel heating system and air shutter |
US9829195B2 (en) | 2009-12-14 | 2017-11-28 | David Deng | Dual fuel heating source with nozzle |
US8851065B2 (en) | 2010-06-07 | 2014-10-07 | David Deng | Dual fuel heating system with pressure sensitive nozzle |
US10073071B2 (en) | 2010-06-07 | 2018-09-11 | David Deng | Heating system |
US9021859B2 (en) | 2010-06-07 | 2015-05-05 | David Deng | Heating system |
US9441840B2 (en) | 2010-06-09 | 2016-09-13 | David Deng | Heating apparatus with fan |
US9739389B2 (en) | 2011-04-08 | 2017-08-22 | David Deng | Heating system |
US8985094B2 (en) | 2011-04-08 | 2015-03-24 | David Deng | Heating system |
US10222057B2 (en) | 2011-04-08 | 2019-03-05 | David Deng | Dual fuel heater with selector valve |
US9752782B2 (en) | 2011-10-20 | 2017-09-05 | David Deng | Dual fuel heater with selector valve |
US9091431B2 (en) | 2012-09-13 | 2015-07-28 | David Deng | Dual fuel valve with air shutter adjustment |
US9441833B2 (en) | 2013-03-02 | 2016-09-13 | David Deng | Heating assembly |
US9752779B2 (en) | 2013-03-02 | 2017-09-05 | David Deng | Heating assembly |
US9423123B2 (en) | 2013-03-02 | 2016-08-23 | David Deng | Safety pressure switch |
US9671111B2 (en) | 2013-03-13 | 2017-06-06 | Ghp Group, Inc. | Fuel selector valve with shutter mechanism for a gas burner unit |
US10240789B2 (en) | 2014-05-16 | 2019-03-26 | David Deng | Dual fuel heating assembly with reset switch |
US10429074B2 (en) | 2014-05-16 | 2019-10-01 | David Deng | Dual fuel heating assembly with selector switch |
Also Published As
Publication number | Publication date |
---|---|
KR20090125034A (en) | 2009-12-03 |
US20100043727A1 (en) | 2010-02-25 |
JP2010513831A (en) | 2010-04-30 |
GB0624945D0 (en) | 2007-01-24 |
EP2092182A1 (en) | 2009-08-26 |
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