CN111981552A - Heat pump and gas boiler combined heating system and regulation and control method thereof - Google Patents
Heat pump and gas boiler combined heating system and regulation and control method thereof Download PDFInfo
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- 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
- F24D3/18—Hot-water central heating systems using heat pumps
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- 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
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- 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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- 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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
- F24D3/1066—Distributors for heating liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
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- 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
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- 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
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- 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
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention relates to the technical field of heating ventilation air conditioners, in particular to a heat pump and gas boiler combined heating system and a regulation and control method thereof.
Description
Technical Field
The invention relates to the technical field of heating ventilation and air conditioning, in particular to a heat pump and gas boiler combined heating system and a regulation and control method thereof.
Background
Since the coefficient of performance COP of a heat pump is related to the outdoor temperature, the COP of the heat pump is greatly reduced in the case of low external temperature, and particularly, when frost is frequently generated, the COP is lower, that is, the same heat is generated, and more electric energy needs to be consumed; to ensure that the COP of a heat pump is high enough and to save electricity, heat pumps are often operated in conjunction with gas boilers, but often find an incorrect operating cut-off to switch between heat pumps or gas boilers.
In case the COP of the heat pump is sufficiently high, the COP of the heat pump system is not high, which is also a common problem of the heat pump system; the COP of the heat pump is related to the water supply temperature of the heat supply system, and the heat supply system taking the heat pump as a heat source cannot supply heat according to the heat load of a heat user, so that the water outlet temperature of the heat pump is high, and the COP of the heat pump is also one of the reasons for low COP.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heat pump and gas boiler combined heat supply system and a regulation and control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat pump and gas boiler combined heat supply system comprises a heat pump, a gas boiler, a regulation controller, a heat meter, a temperature and pressure sensor, a room temperature monitoring system, a water pump and a heat user, wherein a plurality of gas boilers are connected between a water supply pipe and a water return pipe of the gas boiler, and the gas boilers are connected with a gas meter of the gas boiler; the tail end of the gas boiler water supply pipe is connected with an upper T joint of the gas boiler; the gas boiler water return pipe is connected with a gas boiler circulating pump, a gas boiler heat meter, a gas boiler return water temperature sensor, a gas boiler return water pressure sensor and a gas boiler return water ball valve, and the starting end of the gas boiler water return pipe is connected with a lower T-joint connected with the gas boiler;
a plurality of heat pumps are connected between the heat pump water supply pipe and the heat pump water return pipe, and the heat pumps are connected with the heat pump electric energy meter; the heat pump water supply pipe is connected with the heat pump water supply temperature sensor, the heat pump water supply pressure sensor and the heat pump water return ball valve, and the tail end of the heat pump water supply pipe is connected with the heat pump upper T joint; the heat pump water return pipe is connected with a heat pump circulating pump, a heat pump heat meter, a heat pump water return temperature sensor, a heat pump water return pressure sensor and a heat pump water supply ball valve, and the starting end of the heat pump water return pipe is connected with a lower T-joint connected with a heat pump;
the inlet water pipe of the two-network circulating pump is connected with the two-network circulating pump, the check valve, the two-network water supply temperature sensor, the two-network water supply pressure sensor and the two-network water supply pipe; the two-network water supply pipe is connected with the two-network water supply pipe ball valve and the water separator, and the tail end of the two-network water supply pipe is connected with a hot user; the hot user is connected with the two-network water return pipe, and the two-network water return pipe is connected with the water collector, the two-network water return ball valve, the dirt remover, the two-network water return temperature sensor, the two-network water return pressure sensor and the two-network flow meter.
Meanwhile, the upper T joint of the gas boiler is connected with a water inlet pipe of the two-network circulating pump, and the lower T joint of the heat pump is connected with a water return pipe of the two-network circulating pump; the lower T joint connected with the gas boiler is connected with the upper T joint of the heat pump through the gas boiler and the heat pump communicating pipe;
the heat pump circulating pump, the gas boiler circulating pump and the two-network circulating pump are all provided with frequency converters and electric energy meters; the gas boiler power supply part and the heat pump power supply part are also independently provided with an electricity meter; the gas boiler is provided with a gas meter independently, all electricity meters, gas meters, heat meters and flow meters are provided with remote digital interfaces, and the regulating controller can directly read instantaneous quantity and cumulant quantity;
the left end of the regulation controller is provided with a controller analog input interface and a controller digital interface, and the right end of the regulation controller is provided with a controller analog output interface; the regulation controller controls the whole heating system to operate.
The distance between the upper T joint and the lower T joint which are connected with the heat pump is 3-5 pipe diameters, and the distance between the upper T joint and the lower T joint which are connected with the gas boiler is 3-5 pipe diameters.
A regulation and control method of a heat pump and gas boiler combined heating system comprises the following steps:
s1: calculating a minimum cost coefficient
(1) The regulation and control controller acquires the operation data of the heating system: the heat pump outputs heat and electricity consumption, the output heat and gas consumption of the gas boiler, the water outlet and return temperature of the heat pump and the gas boiler, the water supply temperature and return temperature of the heat supply network, and the pressure sensors of the heat pump, the gas boiler, the first network and the second network;
(2) the regulation and control controller calculates the heat supply quantity required by the heat user according to the heat load of the heat user, and the heat supply quantity calculation formula is as follows: qFor supplying to= k1 × t (tn-tw), where k1 is a heat supply coefficient, which can be obtained from historical data or empirical data, and the value is proportional to the heat supply area; tn is room temperature; tw is the external temperature;
(3) because the heat pump and the gas boiler are adopted for supplying heat in a combined manner, Q isPump and method of operating the same=QFor supplying to-QFurnace with a heat exchanger(ii) a Here QPump and method of operating the sameIs the heat output of the heat pump, QFor supplying toIs the heat supply of the heat consumer, QFurnace with a heat exchangerIs the heat output by the gas boiler;
(4) heat pump coefficient of performance calculation COPHeat pump=QPump and method of operating the same/QHeat pump electric power(ii) a Here QHeat pump electric powerIs the amount of electricity input to the heat pump;
(5) gas boiler efficiency calculation η = QFurnace with a heat exchanger/QFurnace gas inlet(ii) a Here QFurnace gas inletIs the natural gas heat input to the gas boiler;
(6) calculating cost coefficient Y1= QHeat pump electric power*￥Price of electricity+QFurnace gas inlet*￥Gas price of furnace. Note that in the case of peak-to-valley electricity prices, the cost coefficient is calculated in terms of time periods and in terms of peak-to-valley electricity prices;
(7) make the gas boiler output heat QFurnace with a heat exchangerCalculating the heat quantity Q output by the heat pump when the heat quantity Q changes by 1% every time when the heat quantity Q changes by 0-100%Pump and method of operating the sameAnd calculating a cost coefficient;
(8) finding the minimum cost coefficient in the cost coefficient Y1 series, and corresponding to the Q of the minimum cost coefficientPump and method of operating the sameAnd QFurnace with a heat exchangerThe most economical heat distribution ratio of the pump furnace is obtained;
(9) according to the minimum compositionQ corresponding to this coefficientPump and method of operating the sameAnd the outlet water temperature tg of the heat pump can be calculatedPump and method of operating the same=QPump and method of operating the same/GHeat pump flow+thTwo nets(ii) a Where G isHeat pump flowIs the flow of the heat pump water system thTwo netsIs the return water temperature of the second net;
(10) q according to the minimum cost coefficientFurnace with a heat exchangerCan calculate the water outlet temperature tg of the gas boilerFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the same(ii) a Where G isFurnace flowIs the flow rate of the gas boiler water system;
(11) the above (2) to (10) are calculated once per hour;
s2: calculating an optimal flow rate
(1) Make the system optimal flow GFlow of liquid=GFlow rate of pump=GFurnace flow=GTwo network trafficLet flow rate GFlow of liquidThe design flow is changed to K2%, each change is reduced by 1%, and the selection range of K2% is 60% -100%;
(2) according to tgFlow of pump=QPump and method of operating the same/GFlow rate of pump+thTwo netsCalculating the outlet water temperature of the heat pump, and tgFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the sameCalculating the water outlet temperature of the gas boiler;
(3) calculating the COP of the heat pump after changing the flowFlow rate=COPPump and method of operating the same+（tgPump and method of operating the same-tgFlow of pump) K3%, the value of k3 is selected from 1-4;
(4) calculating heat pump input electric quantity, QHeat pump electric power= QPump and method of operating the same/ COPFlow rate；
(5) Calculating the System COP, COPSystem for controlling a power supply=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace electricity is gone into+QFurnace gas inlet+QElectric inlet of water pump）；
(6) Calculating the combined coefficient of performance (COP) of a heat pump and a gas boilerPump furnace=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace gas inlet）；
(7) Then, the overall performance coefficient Y2= COP is calculatedPump furnace－ COPSystem for controlling a power supply；
(8) After the above calculation is completed, the optimum flow rate G is selected as the flow rate at which the overall performance coefficient Y2 is the maximum value in the series of the overall performance coefficients Y2Flow of liquidCorresponding to the optimum flow rate GFlow of liquidIs the optimal heat pump outlet water temperature tgPump and method of operating the sameWith the outlet water temperature tg of the gas boilerFurnace with a heat exchanger；
(9) The above (1) to (8) are calculated once per hour;
s3: heat pump water outlet temperature tg calculated by output of regulation controllerFlow of pumpWith the outlet water temperature tg of the gas boilerFurnace with a heat exchangerThe water enters a heat pump and a gas boiler, and the water supply temperature of the second network is controlled to operate according to the given water supply temperature; simultaneously controlling the flow of the heat pump circulating pump, the flow of the gas boiler circulating pump and the flow of the two-network circulating pump according to GHeat pump flow、GFurnace flowAnd GTwo network trafficAnd (5) operating.
Compared with the prior art, the invention has the following beneficial effects: the heat pump and the gas boiler are combined to be used as a heat supply system of a heat source, and the system is simple and reasonable in design and easy to operate; the reasonable method is applied to calculate the accurate operation dividing point to switch the heat pump or the gas boiler, so that the effects of improving the COP of the heat pump, reducing the heat supply cost and optimizing the COP of the system are achieved.
Drawings
FIG. 1 is a block diagram of a heating system according to the present invention;
1. a heat pump electric energy meter; 2. a gas meter of a gas boiler; 3. an inlet water pipe of the two-network circulating pump; 4. a heat pump circulation pump frequency converter; 5. a heat pump circulation pump; 6. a heat pump N; 7. a second heat pump; 8. a first heat pump; 9. a gas boiler electric energy meter; 10. a gas boiler circulating pump frequency converter, 11, a two-network flow meter; 12. a gas boiler circulation pump; 13. a gas boiler N; 14. a second gas-fired boiler; 15. a first gas-fired boiler; 16. a gas boiler feed water temperature sensor; 17. a gas boiler feed water pressure sensor; 18. a gas boiler backwater temperature sensor; 19. a gas boiler backwater pressure sensor; 20. a heat pump water supply temperature sensor; 21. a heat pump water supply pressure sensor; 22. a heat pump return water temperature sensor; 23. a heat pump backwater pressure sensor; 24. a two-network water supply temperature sensor; 25. a two-network water supply pressure sensor; 26. a two-network backwater temperature sensor; 27. a two-network backwater pressure sensor; 28. a dirt separator; 29. a gas boiler water supply ball valve; 30. a water pump electric energy meter; 31. a two-network circulating pump; 32. a two-network circulating pump frequency converter; 33. a check valve; 34. a two-network water supply pipe ball valve; 35. a hot user; 36. a water separator; 37. a water collector; 38. a two-net return water ball valve; 39. a touch screen; 40. an outdoor temperature sensor; 41. a controller analog input interface; 42. a controller digital value interface; 43. a controller analog output interface; 44. a regulation controller; 45. a heat pump water supply ball valve; 46. a heat pump return water ball valve; 47. a gas boiler return water ball valve; 48. a gas boiler water supply pipe; 49. a gas boiler return pipe; 50. a heat pump water supply pipe; 51, a heat pump water return pipe; 52. a two-network water supply pipe; 53. a two-network water return pipe; 54. the gas boiler is connected with an upper T joint; 55. the gas boiler is connected with the lower T joint; 56. the gas boiler, the heat pump communicating pipe, 57 and the heat pump are connected with an upper T joint; 58. the heat pump is connected with the lower T joint; 59. a heat pump calorimeter; 60. a heat meter of the gas boiler; 61. room temperature measurement system.
Detailed Description
The present invention will be described below by way of examples with reference to the accompanying drawings.
As shown in fig. 1, a heat pump and gas boiler combined heating system comprises a heat pump, a gas boiler, a regulation controller, a heat meter, a temperature and pressure sensor, a room temperature monitoring system, a water pump and a heat consumer, wherein a plurality of gas boilers are connected between a water supply pipe 48 of the gas boiler and a water return pipe 49 of the gas boiler, and the gas boilers are connected with a gas meter 2 of the gas boiler; the gas boiler water supply pipe 48 is connected with the gas boiler water supply temperature sensor 16, the gas boiler water supply pressure sensor 17 and the gas boiler water supply ball valve 29, and the tail end of the gas boiler water supply pipe 48 is connected with the gas boiler upper T-shaped connector 54; the gas boiler water return pipe 49 is connected with a gas boiler circulating pump 12, a gas boiler heat meter 60, a gas boiler water return temperature sensor 18, a gas boiler water return pressure sensor 19 and a gas boiler water return ball valve 47, the starting end of the gas boiler water return pipe 49 is connected with a gas boiler lower connection T-joint 55, and the gas boiler circulating pump 12 is connected with a gas boiler circulating pump frequency converter 10;
a plurality of heat pumps are connected between the heat pump water supply pipe 50 and the heat pump water return pipe 51, and the heat pumps are connected with the heat pump electric energy meter 1; the heat pump water supply pipe 50 is connected with the heat pump water supply temperature sensor 20, the heat pump water supply pressure sensor 21 and the heat pump water return ball valve 46, and the tail end of the heat pump water supply pipe 50 is connected with the heat pump upper T-shaped connector 57; the heat pump water return pipe 51 is connected with the heat pump circulating pump 5, the heat pump heat meter 59, the heat pump return water temperature sensor 22, the heat pump return water pressure sensor 23 and the heat pump water supply ball valve 45, the starting end of the heat pump water return pipe 51 is connected with the heat pump connection lower T-joint 58, and the heat pump circulating pump 5 is connected with the heat pump circulating pump frequency converter 4; the heat pump heat source and the gas boiler heat source are connected in series by adopting a double-T structure, and the heat pump water and the gas boiler water are mixed to form heat supply network water supply.
The inlet water pipe 3 of the two-network circulating pump is connected with a two-network circulating pump 31, a check valve 33, a two-network water supply temperature sensor 24, a two-network water supply pressure sensor 25 and a two-network water supply pipe 52, and the two-network circulating pump 31 is connected with a two-network circulating pump frequency converter 32; the two-network water supply pipe 52 is connected with the two-network water supply pipe ball valve 34 and the water separator 36, and the tail end of the two-network water supply pipe 52 is connected with the hot user 35; the hot user 35 is connected with a two-network water return pipe 53, and the two-network water return pipe 53 is connected with a water collector 37, a two-network water return ball valve 38, a dirt separator 28, a two-network water return temperature sensor 26, a two-network water return pressure sensor 27 and a two-network flow meter 11;
meanwhile, the gas boiler is connected with an upper T joint 54 and a water inlet pipe 3 of the two-network circulating pump, and the heat pump is connected with a lower T joint 58 and a two-network water return pipe 53; the lower gas boiler connection T-joint 55 is connected with the upper heat pump connection T-joint 57 through the gas boiler and the heat pump communicating pipe 56;
the left end of the regulation controller 44 is provided with a controller analog input interface 41 and a controller digital interface 42, and the right end is provided with a controller analog output interface 43; the system is provided with a room temperature measuring system 61 and an outdoor temperature sensor 40, digital communication is adopted between a heat pump in the heat supply system and the gas-fired boiler and a regulation controller, and the regulation controller can set the outlet water temperature of the heat pump and the outlet water temperature of the gas-fired boiler.
The distance between the upper T joint and the lower T joint which are connected with the heat pump is 3-5 pipe diameters, and the distance between the upper T joint and the lower T joint which are connected with the gas boiler is 3-5 pipe diameters.
A regulation method is embedded in the regulation controller, and the combined energy-saving operation of the heat pump and the gas boiler is realized.
The working principle is as follows: temperature tg of two-network water supplyTwo netsThe two heat pump furnace sources share the same, and the adjustable range of the share proportion is 0-100%; heat pump COP upon detectionHeat pumpGas boiler efficiency eta, electricity price and heat price, and realize energy-saving operation in the most economical mode.
A regulation and control method of a heat pump and gas boiler combined heating system comprises the following steps:
s1: calculating a minimum cost coefficient
(1) The regulation and control controller acquires the operation data of the heating system: the heat pump outputs heat and electricity consumption, the output heat and gas consumption of the gas boiler, the water outlet and return temperature of the heat pump and the gas boiler, the water supply temperature and return temperature of the heat supply network, and the pressure sensors of the heat pump, the gas boiler, the first network and the second network;
(2) the regulation and control controller calculates the heat supply quantity required by the heat user according to the heat load of the heat user, and the heat supply quantity calculation formula is as follows: qFor supplying to= k1 × t (tn-tw), where k1 is a heat supply coefficient, which can be obtained from historical data or empirical data, and the value is proportional to the heat supply area; tn is room temperature; tw is the external temperature;
(3) because the heat pump and the gas boiler are adopted for supplying heat in a combined manner, Q isPump and method of operating the same=QFor supplying to-QFurnace with a heat exchanger(ii) a Here QPump and method of operating the sameIs the heat output of the heat pump, QFor supplying toIs the heat supply of the heat consumer, QFurnace with a heat exchangerIs the heat output by the gas boiler;
(4) heat pump coefficient of performance calculation COPHeat pump=QPump and method of operating the same/QHeat pump electric power(ii) a Here QHeat pump electric powerIs the amount of electricity input to the heat pump;
(5) gas boiler efficiency calculation η = QFurnace with a heat exchanger/QFurnace gas inlet(ii) a Here QFurnace gas inletIs the natural gas heat input to the gas boiler;
(6) calculating cost coefficientsY1=QHeat pump electric power*￥Price of electricity+QFurnace gas inlet*￥Gas price of furnace. Note that in the case of peak-to-valley electricity prices, the cost coefficient is calculated in terms of time periods and in terms of peak-to-valley electricity prices;
(7) make the gas boiler output heat QFurnace with a heat exchangerCalculating the heat quantity Q output by the heat pump when the heat quantity Q changes by 1% every time when the heat quantity Q changes by 0-100%Pump and method of operating the sameAnd calculating a cost coefficient;
(8) finding the minimum cost coefficient in the cost coefficient Y1 series, and corresponding to the Q of the minimum cost coefficientPump and method of operating the sameAnd QFurnace with a heat exchangerThe most economical heat distribution ratio of the pump furnace is obtained;
(9) q according to the minimum cost coefficientPump and method of operating the sameAnd the outlet water temperature tg of the heat pump can be calculatedPump and method of operating the same=QPump and method of operating the same/GHeat pump flow+thTwo nets(ii) a Where G isHeat pump flowIs the flow of the heat pump water system thTwo netsIs the return water temperature of the second net;
(10) q according to the minimum cost coefficientFurnace with a heat exchangerCan calculate the water outlet temperature tg of the gas boilerFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the same(ii) a Where G isFurnace flowIs the flow rate of the gas boiler water system;
(11) the above (2) to (10) are calculated once per hour;
s2: calculating an optimal flow rate
(1) Make the system optimal flow GFlow of liquid=GFlow rate of pump=GFurnace flow=GTwo network trafficLet flow rate GFlow of liquidThe design flow is changed to K2%, each change is reduced by 1%, and the value range of K2% is 60% -100%;
(2) according to tgFlow of pump=QPump and method of operating the same/GFlow rate of pump+thTwo netsCalculating the outlet water temperature of the heat pump, and tgFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the sameCalculating the water outlet temperature of the gas boiler;
(3) calculating the COP of the heat pump after changing the flowFlow rate=COPPump and method of operating the same+（tgPump and method of operating the same-tgFlow of pump) K3%, wherein the value range of k3 is 1-4;
(4) calculating heat pump input electric quantity, QHeat pump electric power= QPump and method of operating the same/ COPFlow rate；
(5) Calculating the System COP, COPSystem for controlling a power supply=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace electricity is gone into+QFurnace gas inlet+QElectric inlet of water pump）；
(6) Calculating the combined coefficient of performance (COP) of a heat pump and a gas boilerPump furnace=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace gas inlet）；
(7) Then, the overall performance coefficient Y2= COP is calculatedPump furnace－ COPSystem for controlling a power supply；
(8) After the above calculation is completed, the optimum flow rate G is selected as the flow rate at which the overall performance coefficient Y2 is the maximum value in the series of the overall performance coefficients Y2Flow of liquidAnd the optimal heat pump outlet water temperature tg corresponding to the optimal flowPump and method of operating the sameWith the outlet water temperature tg of the gas boilerFurnace with a heat exchanger；
(9) The above (1) to (8) are calculated once per hour;
s3: heat pump water outlet temperature tg calculated by output of regulation controllerFlow of pumpWith the outlet water temperature tg of the gas boilerFurnace with a heat exchangerThe water enters a heat pump and a gas boiler, and the water supply temperature of the second network is controlled to operate according to the given water supply temperature; simultaneously controlling the flow of the heat pump circulating pump, the flow of the gas boiler circulating pump and the flow of the two-network circulating pump according to GHeat pump flow、GFurnace flowAnd GTwo network trafficAnd (5) operating.
The foregoing examples are merely preferred embodiments of the present invention, which is not limited to the applications listed in the description and the embodiments, but may be fully applicable in various fields of adaptation of the invention, further modifications being readily apparent to those skilled in the art, and the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.
Claims (7)
1. A heat pump and gas boiler combined heating system is characterized by comprising a heat pump, a gas boiler, a regulation controller, a heat meter, a temperature and pressure sensor, a room temperature monitoring system, a water pump and a heat user, wherein a plurality of gas boilers are connected between a water supply pipe and a water return pipe of the gas boiler, and the gas boilers are connected with a gas meter of the gas boiler; the tail end of the gas boiler water supply pipe is connected with an upper T joint of the gas boiler; the gas boiler water return pipe is connected with a gas boiler circulating pump, a gas boiler heat meter, a gas boiler return water temperature sensor, a gas boiler return water pressure sensor and a gas boiler return water ball valve, and the starting end of the gas boiler water return pipe is connected with a lower T-joint connected with the gas boiler;
a plurality of heat pumps are connected between the heat pump water supply pipe and the heat pump water return pipe, and the heat pumps are connected with the heat pump electric energy meter; the heat pump water supply pipe is connected with the heat pump water supply temperature sensor, the heat pump water supply pressure sensor and the heat pump water return ball valve, and the tail end of the heat pump water supply pipe is connected with the heat pump upper T joint; the heat pump water return pipe is connected with a heat pump circulating pump, a heat pump heat meter, a heat pump water return temperature sensor, a heat pump water return pressure sensor and a heat pump water supply ball valve, the starting end of the heat pump water return pipe is connected with a heat pump connection lower T joint, and the heat pump circulating pump is connected with a heat pump circulating pump frequency converter;
the inlet water pipe of the two-network circulating pump is connected with a two-network circulating pump, a check valve, a two-network water supply temperature sensor, a two-network water supply pressure sensor and a two-network water supply pipe, and the two-network circulating pump is connected with a two-network circulating pump frequency converter; the two-network water supply pipe is connected with the two-network water supply pipe ball valve and the water separator, and the tail end of the two-network water supply pipe is connected with a hot user; the hot user is connected with a two-network water return pipe, and a water collector, a two-network water return ball valve, a dirt remover, a two-network water return temperature sensor, a two-network water return pressure sensor and a two-network flow meter are connected to the two-network water return pipe;
meanwhile, the upper T joint of the gas boiler is connected with a water inlet pipe of the two-network circulating pump, and the lower T joint of the heat pump is connected with a water return pipe of the two-network circulating pump; the lower T joint connected with the gas boiler is connected with the upper T joint of the heat pump through the gas boiler and the heat pump communicating pipe;
the left end of the regulation controller is provided with a controller analog input interface and a controller digital interface, and the right end of the regulation controller is provided with a controller analog output interface.
2. A heat pump and gas boiler combined heating system according to claim 1, wherein the distance between the upper and lower T-joints connected with the heat pump should be 3-5 pipe diameters, and the distance between the upper and lower T-joints connected with the gas boiler should also be 3-5 pipe diameters.
3. A heat pump and gas boiler combined heating system according to claim 1, wherein the heat pump circulating pump, the gas boiler circulating pump and the two-network circulating pump are all provided with frequency converters and with electric energy meters; the gas boiler power supply part and the heat pump power supply part are also independently provided with an electricity meter; and the gas boiler is independently provided with a gas meter.
4. A heat pump and gas boiler combined heating system according to claim 1, characterized in that all electricity meters and gas meters, heat meters and flow meters have remote digital interfaces, and the regulation controller can directly read instantaneous and cumulative quantities.
5. A regulation and control method of a heat pump and gas boiler combined heating system is characterized by comprising the following steps:
s1: calculating a minimum cost coefficient
(1) The regulation and control controller acquires the operation data of the heating system: the heat pump outputs heat and electricity consumption, the output heat and gas consumption of the gas boiler, the water outlet and return temperature of the heat pump and the gas boiler, the water supply temperature and return temperature of the heat supply network, and the pressure sensors of the heat pump, the gas boiler, the first network and the second network;
(2) the regulation and control controller calculates the heat supply quantity required by the heat user according to the heat load of the heat user, and the heat supply quantity calculation formula is as follows: qFor supplying to= k1 × t (tn-tw), where k1 is a heat supply coefficient, which can be obtained from historical data or empirical data, and the value is proportional to the heat supply area; tn is room temperature; tw is outerWarming;
(3) because the heat pump and the gas boiler are adopted for supplying heat in a combined manner, Q isPump and method of operating the same=QFor supplying to-QFurnace with a heat exchanger(ii) a Here QPump and method of operating the sameIs the heat output of the heat pump, QFor supplying toIs the heat supply of the heat consumer, QFurnace with a heat exchangerIs the heat output by the gas boiler;
(4) heat pump coefficient of performance calculation COPHeat pump=QPump and method of operating the same/QHeat pump electric power(ii) a Here QHeat pump electric powerIs the amount of electricity input to the heat pump;
(5) gas boiler efficiency calculation η = QFurnace with a heat exchanger/QFurnace gas inlet(ii) a Here QFurnace gas inletIs the natural gas heat input to the gas boiler;
(6) calculating cost coefficient Y1= QHeat pump electric power*￥Price of electricity+QFurnace gas inlet*￥Gas price of furnace；
Note that in the case of peak-to-valley electricity prices, the cost coefficient is calculated in terms of time periods and in terms of peak-to-valley electricity prices;
(7) make the gas boiler output heat QFurnace with a heat exchangerCalculating the heat quantity Q output by the heat pump when the heat quantity Q changes by 1% every time when the heat quantity Q changes by 0-100%Pump and method of operating the sameAnd calculating a cost coefficient;
(8) finding the minimum cost coefficient in the cost coefficient Y1 series, and corresponding to the Q of the minimum cost coefficientPump and method of operating the sameAnd QFurnace with a heat exchangerThe most economical heat distribution ratio of the pump furnace is obtained;
(9) q according to the minimum cost coefficientPump and method of operating the sameAnd the outlet water temperature tg of the heat pump can be calculatedPump and method of operating the same=QPump and method of operating the same/GHeat pump flow+thTwo nets(ii) a Where G isHeat pump flowIs the flow of the heat pump water system thTwo netsIs the return water temperature of the second net;
(10) q according to the minimum cost coefficientFurnace with a heat exchangerCan calculate the water outlet temperature tg of the gas boilerFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the same(ii) a Where G isFurnace flowIs the flow rate of the gas boiler water system;
(11) the above (2) to (10) are calculated once per hour;
s2: calculating an optimal flow rate
(1) Make the system optimal flow GFlow of liquid=GFlow rate of pump=GFurnace flow=GTwo network trafficLet flow rate GFlow of liquidThe design flow is changed to k2%, and each change is reduced by 1%;
(2) according to tgFlow of pump=QPump and method of operating the same/GFlow rate of pump+thTwo netsCalculating the outlet water temperature of the heat pump, and tgFurnace with a heat exchanger=QFurnace with a heat exchanger/GFurnace flow+tgPump and method of operating the sameCalculating the water outlet temperature of the gas boiler;
(3) calculating the COP of the heat pump after changing the flowFlow rate=COPPump and method of operating the same+（tgPump and method of operating the same-tgFlow of pump）*k3%；
(4) Calculating heat pump input electric quantity, QHeat pump electric power= QPump and method of operating the same/ COPFlow rate；
(5) Calculating the System COP, COPSystem for controlling a power supply=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace electricity is gone into+QFurnace gas inlet+QElectric inlet of water pump）；
(6) Calculating the combined coefficient of performance (COP) of a heat pump and a gas boilerPump furnace=（QPump and method of operating the same+QFurnace with a heat exchanger）/（QHeat pump electric power+QFurnace gas inlet）；
(7) Then, the overall performance coefficient Y2= COP is calculatedPump furnace－ COPSystem for controlling a power supply；
(8) After the above calculation is completed, the optimum flow rate G is selected as the flow rate at which the overall performance coefficient Y2 is the maximum value in the series of the overall performance coefficients Y2Flow of liquidCorresponding to the optimum flow rate GFlow of liquidIs the optimal heat pump outlet water temperature tgPump and method of operating the sameWith the outlet water temperature tg of the gas boilerFurnace with a heat exchanger；
(9) The above (1) to (8) are calculated once per hour;
s3: heat pump water outlet temperature tg calculated by output of regulation controllerFlow of pumpWith the outlet water temperature tg of the gas boilerFurnace with a heat exchangerThe water enters a heat pump and a gas boiler, and the water supply temperature of the second network is controlled to operate according to the given water supply temperature; simultaneously controlling the flow of the heat pump circulating pump, the flow of the gas boiler circulating pump and the flow of the two-network circulating pumpAccording to GHeat pump flow、GFurnace flowAnd GTwo network trafficAnd (5) operating.
6. The method for regulating and controlling the heat pump and gas boiler combined heating system according to claim 5, wherein K2% is selected from the range of 60% to 100%.
7. The method for regulating and controlling the heat pump and gas boiler combined heating system according to claim 5, wherein the value range of k3 is 1-4.
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