CN112413701A - Air source heat pump auxiliary electric heating grading control system and control method - Google Patents
Air source heat pump auxiliary electric heating grading control system and control method Download PDFInfo
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- CN112413701A CN112413701A CN202011155191.0A CN202011155191A CN112413701A CN 112413701 A CN112413701 A CN 112413701A CN 202011155191 A CN202011155191 A CN 202011155191A CN 112413701 A CN112413701 A CN 112413701A
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- 238000005485 electric heating Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000005070 sampling Methods 0.000 claims abstract description 40
- 239000000872 buffer Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000003139 buffering effect Effects 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0228—Central heating systems using heat accumulated in storage masses using heat pumps water heating system combined with conventional heater
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/08—Electric heater
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/10—Heat storage materials, e.g. phase change materials or static water enclosed in a space
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/20—Heat consumers
- F24D2220/2009—Radiators
- F24D2220/2036—Electric radiators
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- 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)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention is suitable for the technical field of heating control, and provides an auxiliary electric heating grading control system of an air source heat pump, which comprises: the air source heat pump is connected with the buffering water tank through a circulating water pump; the buffer water tank is provided with a first-stage electric heater and a second-stage electric heater, and the first-stage electric heater and the second-stage electric heater are respectively connected with an actuator; the controller is connected with the actuator and is used for controlling the running states of the first-stage electric heater and the second-stage electric heater through the actuator; and the temperature sensor is arranged on the buffer water tank, is electrically connected with the controller, is used for detecting the water supply temperature of the water tank and feeds back the water supply temperature to the controller. The invention also correspondingly provides a control method. Therefore, when the air source heat pump cannot meet the heat supply requirement, the invention controls and starts several stages of electric heating according to the temperature rise speed in a set sampling time interval, and sets the temperature control precision value, so that more accurate control can be realized, and the invention has the advantages of reducing the feedback delay of the system, improving the temperature control precision, reducing the temperature fluctuation and saving the energy consumption.
Description
Technical Field
The invention relates to the technical field of heating control, in particular to an auxiliary electric heating grading control system and method for an air source heat pump.
Background
The air source heat pump is used as a high-efficiency and energy-saving clean heating mode, the air source heat pump is widely applied to various occasions in recent years, the system consumes a small amount of electric energy, the energy in the air is transferred to a working medium through inverse Carnot cycle to heat water, and heat supply on the user side is carried out. The electric auxiliary heating has larger energy consumption, the setting of the control method has obvious effect on saving the energy consumption, the electric auxiliary heating control system under the current condition is simple to set, the conditions of insufficient or overlarge electric auxiliary heating often occur, and the problems of larger temperature fluctuation, poor heating effect and energy waste are caused.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide an air source heat pump auxiliary electric heating hierarchical control system and control method, which can control and start several levels of electric heating according to a temperature rise speed within a set sampling time interval when an air source heat pump cannot meet a heat supply requirement, and set a temperature control precision value, so as to achieve more precise control, and have the advantages of reducing system feedback delay, improving temperature control precision, reducing temperature fluctuation, and saving energy consumption.
In order to achieve the above object, the present invention provides an air source heat pump auxiliary electric heating stage control system, comprising:
the air source heat pump is connected with the buffering water tank through a circulating water pump;
the buffer water tank is provided with a first-stage electric heater and a second-stage electric heater, and the first-stage electric heater and the second-stage electric heater are respectively connected with an actuator;
the controller is connected with the actuator and is used for controlling the running states of the first-stage electric heater and the second-stage electric heater through the actuator;
and the temperature sensor is arranged on the buffer water tank, is electrically connected with the controller, is used for detecting the water supply temperature of the water tank and feeds back the water supply temperature to the controller.
According to the air source heat pump auxiliary electric heating grading control system, the system further comprises a third-stage electric heater arranged on the buffer water tank.
According to the air source heat pump auxiliary electric heating grading control system, the first-stage electric heater, the second-stage electric heater and the third-stage electric heater are sequentially arranged from bottom to top.
According to the air source heat pump auxiliary electric heating grading control system, the temperature sensor is used for detecting the water supply temperature of the water tank in a time-sharing mode.
According to the air source heat pump auxiliary electric heating grading control system, the method comprises the following steps:
s1, setting a water supply target temperature Tg, a sampling time interval delta T, temperature rise rate comparison parameters a and b (a is less than b) and temperature control accuracy delta T;
s2, measuring the water supply temperature Tg, and judging whether the water supply temperature Tg is less than the water supply target temperature Tg, if so, executing a step S3, otherwise, continuously measuring the water supply temperature Tg through a temperature sensor, and performing control circulation;
s3, judging whether the air source heat pump runs at full load, if so, executing a step S4, otherwise, controlling and adjusting the working state of the air source heat pump;
s4, controlling the first-stage electric heater to be started, and calculating a sampling temperature difference delta Tg between ti and ti +1 time period as Tgi +1-Tgi after a set sampling time interval delta t;
s5, judging whether the sampling temperature difference delta Tg is larger than the temperature rise rate comparison parameter a, if delta Tg is larger than a, executing a step S6, otherwise executing a step S7;
s6, further judging whether the sampling temperature difference delta Tg is larger than the temperature rise rate comparison parameter b, if delta Tg is larger than b, executing a step S8, otherwise executing a step S9;
s7, controlling the second and third-level electric heaters to be started, carrying out timing measurement through the temperature sensor, and calculating t after a set sampling time interval delta tiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
s8, controlling to close the second and third-stage electric heaters; judging whether the water supply temperature Tg is greater than the sum of the water supply target temperature Tg and the temperature control precision delta T, if Tg is greater than Tg + delta T, closing the first-stage electric heater, otherwise, continuously carrying out timing measurement through the temperature sensor, and after a set sampling time interval delta T, calculating TiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
s9, controlling the second-stage electric heater to be started and the third-stage electric heater to be closed, continuing to perform timing measurement through the temperature sensor, and calculating t after a set sampling time interval delta tiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiAnd performing a control loop.
The invention is suitable for the technical field of heating control, and provides an auxiliary electric heating grading control system of an air source heat pump, which comprises: the air source heat pump is connected with the buffering water tank through a circulating water pump; the buffer water tank is provided with a first-stage electric heater and a second-stage electric heater, and the first-stage electric heater and the second-stage electric heater are respectively connected with an actuator; the controller is connected with the actuator and is used for controlling the running states of the first-stage electric heater and the second-stage electric heater through the actuator; and the temperature sensor is arranged on the buffer water tank, is electrically connected with the controller, is used for detecting the water supply temperature of the water tank and feeds back the water supply temperature to the controller. The invention also correspondingly provides a control method. Therefore, when the air source heat pump cannot meet the heat supply requirement, the invention controls and starts several stages of electric heating according to the temperature rise speed in a set sampling time interval, and sets the temperature control precision value, so that more accurate control can be realized, and the invention has the advantages of reducing the feedback delay of the system, improving the temperature control precision, reducing the temperature fluctuation and saving the energy consumption.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a control flow diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides an air source heat pump auxiliary electric heating hierarchical control system, which is characterized in that the system comprises:
the air source heat pump 1 is connected with the buffer water tank 2 through a circulating water pump 14 and a control valve 12.
The buffer water tank 2 is provided with a first-stage electric heater 3 and a second-stage electric heater 4, and the first-stage electric heater 3 and the second-stage electric heater 4 are respectively connected with an actuator 8. In the present invention, the electric heater may have multiple stages, for example, in one embodiment, a third stage electric heater 4 may be further provided
The controller 7 is connected with the actuator 8 and is used for controlling the running states of the first-stage electric heater 3 and the second-stage electric heater 4 through the actuator 8;
and the temperature sensor 6 is arranged on the buffer water tank 2, is electrically connected with the controller 8, is used for detecting the water supply temperature of the water tank 2 and feeds back the water supply temperature to the controller 7.
The buffer water tank 2 has good heat storage performance, can buffer system pressure fluctuation, eliminates water hammer to play a role in stabilizing pressure and unloading, can ensure the stability of the water pressure of the system, and ensures that the water pump cannot be frequently started due to the change of the pressure; in order to realize the maximization of heat utilization, a heat supply water outlet is arranged at the upper part of the water tank, and a return water inlet is arranged at the lower part of the water tank; the actuator 8 is electrically connected with the electric heater, the electric heater is divided into three stages, the electric heater is arranged at the position of the inner side wall of the buffer water tank from bottom to top according to the height, the first-stage electric heater 3 is arranged at the bottom layer, the second-stage electric heater 4 is arranged at the middle layer, and the third-stage electric heater 5 is arranged at the upper layer, so that the waste of heat can be reduced due to the fact that the heat is transferred from bottom to top during heating, and the energy-saving effect is achieved; the temperature sensor 6 is arranged at the uppermost end of the water tank 2 and is used for monitoring the water supply temperature of the water tank at regular time; the temperature sensor 6 is electrically connected with the controller 7 and transmits the temperature value measured at regular time to the controller 7; the controller 7 is electrically connected with the actuator 8, the controller 7 judges to turn on or turn off the electric heaters of several stages according to the temperature rise speed, and judges to turn off the electric heater of one stage according to the water supply temperature and the temperature control precision; the actuator 8 receives the control signal sent by the controller 7 to perform the step opening or closing of the electric heater.
Referring to FIG. 2, the control flow of the present invention
Further, starting a control system, and setting control parameters: water supply target temperature Tg, sampling time interval delta T, temperature rise rate comparison parameters a and b (a is less than b) and temperature control precision delta T;
further, measuring the water supply temperature Tg, judging whether the water supply temperature Tg is less than the water supply target temperature Tg, and if Tg is less than Tg, judging whether the air source heat pump runs in full load; otherwise, continuously measuring the water supply temperature Tg through the temperature sensor, and performing control circulation;
further, when Tg is less than Tg, judging whether the air source heat pump runs at full load or not, if the air source heat pump runs at full load, starting primary electric heating, otherwise, adjusting the air source heat pump, and after the adjustment is finished, continuously measuring the water supply temperature Tg through the temperature sensor to carry out control circulation;
further, when the primary electric heater is turned on, after a set sampling time interval Δ t, t is calculatediAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-Tgi；
Further, whether the sampling temperature difference delta Tg is larger than a temperature rise rate comparison parameter a or not is judged, if the sampling temperature difference delta Tg is larger than a, whether the sampling temperature difference delta Tg is larger than a temperature rise rate comparison parameter b or not is judged, otherwise, the two-stage and three-stage electric heater is started, timing measurement is carried out through the temperature sensor, and after a set sampling time interval delta t, t is calculatediAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
further, when delta Tg is larger than a, judging whether the sampling temperature difference delta Tg is larger than a temperature rise rate comparison parameter b, if delta Tg is larger than b, closing the two-stage and three-stage electric heaters, otherwise, opening the two-stage electric heater, closing the three-stage electric heater, continuously carrying out timing measurement through the temperature sensor, and after a set sampling time interval delta t, calculating tiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
further, when the delta Tg is larger than b, judging whether the water supply temperature Tg is larger than the sum of the water supply target temperature Tg and the temperature control precision delta T, if the Tg is larger than the Tg plus the delta T, closing the primary electric heating, otherwise, continuously carrying out timing measurement through the temperature sensor, and after a set sampling time interval delta T, calculating TiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
further, after the primary electric heating is turned off, the control cycle is performed by returning to the initial measurement of the feed water temperature Tg by the temperature sensor.
The invention has the advantages that when the air source heat pump can not meet the heat supply requirement, several stages of electric heating are controlled to be started according to the temperature rise speed in a set sampling time interval, and meanwhile, the temperature control precision value is set, so that more accurate control can be realized, and the invention has the advantages of reducing the feedback delay of the system, improving the temperature control precision, reducing the temperature fluctuation and saving the energy consumption.
In summary, the present invention is applicable to the technical field of heating control, and provides an auxiliary electric heating stage control system for an air source heat pump, the system comprising: the air source heat pump is connected with the buffering water tank through a circulating water pump; the buffer water tank is provided with a first-stage electric heater and a second-stage electric heater, and the first-stage electric heater and the second-stage electric heater are respectively connected with an actuator; the controller is connected with the actuator and is used for controlling the running states of the first-stage electric heater and the second-stage electric heater through the actuator; and the temperature sensor is arranged on the buffer water tank, is electrically connected with the controller, is used for detecting the water supply temperature of the water tank and feeds back the water supply temperature to the controller. The invention also correspondingly provides a control method. Therefore, when the air source heat pump cannot meet the heat supply requirement, the invention controls and starts several stages of electric heating according to the temperature rise speed in a set sampling time interval, and sets the temperature control precision value, so that more accurate control can be realized, and the invention has the advantages of reducing the feedback delay of the system, improving the temperature control precision, reducing the temperature fluctuation and saving the energy consumption.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An air source heat pump assisted electrical heating hierarchical control system, the system comprising:
the air source heat pump is connected with the buffering water tank through a circulating water pump;
the buffer water tank is provided with a first-stage electric heater and a second-stage electric heater, and the first-stage electric heater and the second-stage electric heater are respectively connected with an actuator;
the controller is connected with the actuator and is used for controlling the running states of the first-stage electric heater and the second-stage electric heater through the actuator;
and the temperature sensor is arranged on the buffer water tank, is electrically connected with the controller, is used for detecting the water supply temperature of the water tank and feeds back the water supply temperature to the controller.
2. The air-source heat pump-assisted electric heating hierarchical control system according to claim 1, further comprising a third-stage electric heater disposed in the buffer water tank.
3. The air-source heat pump auxiliary electric heating hierarchical control system of claim 2, wherein the first stage electric heater, the second stage electric heater and the third stage electric heater are sequentially arranged from bottom to top.
4. The air-source heat pump-assisted electric heating hierarchical control system according to claim 1, wherein the temperature sensor is used for detecting the water supply temperature of the water tank in a time-sharing manner.
5. An auxiliary heating control method implemented by the control system of claim 1, the method comprising:
s1, setting a water supply target temperature Tg, a sampling time interval delta T, temperature rise rate comparison parameters a and b (a is less than b) and temperature control accuracy delta T;
s2, measuring the water supply temperature Tg, and judging whether the water supply temperature Tg is less than the water supply target temperature Tg, if so, executing a step S3, otherwise, continuously measuring the water supply temperature Tg through a temperature sensor, and performing control circulation;
s3, judging whether the air source heat pump runs at full load, if so, executing a step S4, otherwise, controlling and adjusting the working state of the air source heat pump;
s4, controlling the first-stage electric heater to be started, and calculating a sampling temperature difference delta Tg between ti and ti +1 time period as Tgi +1-Tgi after a set sampling time interval delta t;
s5, judging whether the sampling temperature difference delta Tg is larger than the temperature rise rate comparison parameter a, if delta Tg is larger than a, executing a step S6, otherwise executing a step S7;
s6, further judging whether the sampling temperature difference delta Tg is larger than the temperature rise rate comparison parameter b, if delta Tg is larger than b, executing a step S8, otherwise executing a step S9;
s7, controlling the second and third-level electric heaters to be started, carrying out timing measurement through the temperature sensor, and calculating t after a set sampling time interval delta tiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
s8, controlling to close the second and third-stage electric heaters; judging whether the water supply temperature Tg is greater than the sum of the water supply target temperature Tg and the temperature control precision delta T, if Tg is greater than Tg + delta T, closing the first-stage electric heater, otherwise, continuously carrying out timing measurement through the temperature sensor, and after a set sampling time interval delta T, calculating TiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiPerforming a control cycle;
s9, controlling the second-stage electric heater to be started and the third-stage electric heater to be closed, continuing to perform timing measurement through the temperature sensor, and calculating t after a set sampling time interval delta tiAnd ti+1Time interval sampling temperature difference Δ Tg ═ Tgi+1-TgiAnd performing a control loop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011155191.0A CN112413701A (en) | 2020-10-26 | 2020-10-26 | Air source heat pump auxiliary electric heating grading control system and control method |
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| CN202011155191.0A CN112413701A (en) | 2020-10-26 | 2020-10-26 | Air source heat pump auxiliary electric heating grading control system and control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425359Y (en) * | 2009-02-26 | 2010-03-17 | 河南新飞家电有限公司 | Auxiliary electric heating device |
| CN102705943A (en) * | 2012-06-27 | 2012-10-03 | 中国扬子集团滁州扬子空调器有限公司 | Heat pump air conditioner adopting secondary auxiliary electric heater and use method thereof |
| CN103075806A (en) * | 2011-04-11 | 2013-05-01 | 刘运柳 | Electric energy, solar energy and air energy water heater water tank structure |
| CN104896567A (en) * | 2015-05-06 | 2015-09-09 | 福建农林大学 | Multi-energy combined hot water system and control method |
| CN106766130A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | The control method and control system of hot water storage tank and hot water storage tank |
-
2020
- 2020-10-26 CN CN202011155191.0A patent/CN112413701A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201425359Y (en) * | 2009-02-26 | 2010-03-17 | 河南新飞家电有限公司 | Auxiliary electric heating device |
| CN103075806A (en) * | 2011-04-11 | 2013-05-01 | 刘运柳 | Electric energy, solar energy and air energy water heater water tank structure |
| CN102705943A (en) * | 2012-06-27 | 2012-10-03 | 中国扬子集团滁州扬子空调器有限公司 | Heat pump air conditioner adopting secondary auxiliary electric heater and use method thereof |
| CN104896567A (en) * | 2015-05-06 | 2015-09-09 | 福建农林大学 | Multi-energy combined hot water system and control method |
| CN106766130A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | The control method and control system of hot water storage tank and hot water storage tank |
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Application publication date: 20210226 |
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