CN111442328A - Electric heating equipment and control method thereof - Google Patents

Electric heating equipment and control method thereof Download PDF

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Publication number
CN111442328A
CN111442328A CN202010310560.2A CN202010310560A CN111442328A CN 111442328 A CN111442328 A CN 111442328A CN 202010310560 A CN202010310560 A CN 202010310560A CN 111442328 A CN111442328 A CN 111442328A
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temperature
electric heating
water
real
inlet
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蔡占良
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Cangzhou Innovay Electronic Design Co ltd
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Cangzhou Innovay Electronic Design Co ltd
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Priority to CN202010310560.2A priority Critical patent/CN111442328A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D13/00Electric heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1096Arrangement or mounting of control or safety devices for electric heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/18Arrangement or mounting of grates or heating means
    • F24H9/1809Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818Arrangement or mounting of electric heating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices
    • F24H9/2007Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014Arrangement or mounting of control or safety devices for water heaters using electrical energy supply

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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)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

The invention discloses an electric heating device and a control method thereof.A microcomputer in the electric heating device is respectively and electrically connected with a power control module, a power temperature sensor, a water inlet temperature sensor, a water outlet temperature sensor and a valve opening monitoring device; the control method comprises the steps of obtaining total heat demand of each room; acquiring real-time inlet water temperature and real-time outlet water temperature of the heat dissipation device; calculating the target inlet water temperature of the heat dissipation device; and adjusting the output power of the electric heating equipment according to the difference between the target water inlet temperature and the real-time water inlet temperature. According to the electric heating equipment and the control method thereof, the heating power of the electric heating equipment is adjusted in real time according to the temperature of inlet and outlet water, the heating effect is ensured, and meanwhile, the variable frequency control is realized.

Description

Electric heating equipment and control method thereof
Technical Field
The invention relates to the technical field of electric heating equipment, in particular to electric heating equipment and a control method thereof.
Background
With the continuous promotion of the work of changing coal into electricity, the air quality is improved, the heating mode of replacing coal with electricity is adopted in the existing coal-to-electricity transformation project, and the electric heating equipment is widely applied.
For a heating apparatus, such as a gas-fired hot water heating furnace, which is not equipped with an indoor ambient temperature controller, it is common to control the operation of the heating apparatus, such as the gas-fired hot water heating furnace, by setting the hot water temperature. However, when the indoor temperature is lowered due to the change of the external environment, the heating apparatus cannot increase the temperature of the hot water intelligently to compensate for the loss of heat. In addition, the general electric heating equipment only controls the water temperature in an on-off mode, the water temperature reaches the upper limit, and the heating element is closed; below the lower water temperature limit, the heating element is activated. One disadvantage is that the impact current is large, requiring a large increase in the grid capacity; one disadvantage is that the water temperature fluctuates greatly and rises and falls continuously between high water temperature and low water temperature; one disadvantage is that without intelligent control, heating cannot be performed according to heat demand; one disadvantage is that the heating elements are high in temperature, low in efficiency, and highly fouled, reducing the product life.
Disclosure of Invention
The invention aims to provide electric heating equipment and a control method thereof, which can adjust the heating power of the electric heating equipment in real time according to the temperature of inlet and outlet water, realize variable frequency control while ensuring the heating effect, and have the characteristics of energy conservation, high efficiency, high intelligent control level and long service life.
In order to achieve the purpose, the invention provides the following scheme:
an electric heating apparatus, the apparatus comprising: the heat dissipation device comprises an electric heating pipe and a water flowing pipeline arranged in the electric heating pipe, the electric heating pipe is electrically connected with a power control module, a power temperature sensor is arranged on the power control module, and the power temperature sensor is used for collecting the temperature of the power control module; a water inlet and a water outlet of the water flowing pipeline are respectively provided with a water inlet temperature sensor and a water outlet temperature sensor, the water inlet temperature sensor is used for acquiring real-time water inlet temperature, and the water outlet temperature sensor is used for acquiring real-time water outlet temperature; the heat dissipation device is also provided with a valve and a valve opening monitoring device, and the valve opening monitoring device is used for acquiring the valve opening; the valve controls the water flow passing through the heating radiator through different opening degrees;
the microcomputer is electrically connected with the power control module, the power temperature sensor, the water inlet temperature sensor, the water outlet temperature sensor and the valve opening monitoring device respectively.
Optionally, an exhaust duct communicated with the water flow duct is arranged on the heat dissipation device, and an exhaust nozzle is arranged on the exhaust duct.
The invention also provides a control method of the electric heating equipment, which is characterized by being applied to the electric heating equipment and comprising the following steps of:
s1, acquiring the total heat demand of each room;
s2, acquiring the real-time inlet water temperature and the real-time outlet water temperature of the heat dissipation device;
s3, obtaining a target inlet water temperature of the heat dissipation device according to the total required heat, the real-time inlet water temperature and the real-time outlet water temperature based on a PID algorithm;
and S4, based on the PID algorithm, adjusting the output power of the electric heating equipment according to the difference between the target inlet water temperature and the real-time inlet water temperature.
Optionally, the step S1, obtaining the total required heat of each room, specifically includes the following steps:
s101, acquiring the indoor temperature of each room and setting a target temperature;
s102, obtaining the valve opening of a heat dissipation device in each room;
s103, based on a PID algorithm, obtaining the heat required by each room according to the indoor temperature, the target temperature and the valve opening degree;
and S104, calculating the sum of the heat demand of each room to obtain the total heat demand of each room.
Optionally, in step S103, based on the PID algorithm, the heat required by each room is obtained according to the indoor temperature, the target temperature, and the valve opening, and the method specifically includes:
the heat demand of each room (difference between indoor temperature and target temperature) and the valve opening degree.
Optionally, in step S4, based on the PID algorithm, the output power of the electric heating device is adjusted according to the difference between the target inlet water temperature and the real-time inlet water temperature, and the method specifically includes:
when the difference between the target water inlet temperature and the real-time water inlet temperature is less than 10 ℃, adjusting the output power of the electric heating equipment to 100%;
when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 10 ℃ and less than 20 ℃, adjusting the output power of the electric heating equipment to 60%;
and when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 20 ℃, adjusting the output power of the electric heating equipment to be 0.
Optionally, after the step S4, the method further includes: step S5, adjusting the output power of the electric heating device according to the temperature of the power control module, specifically:
when the temperature of the power control module is less than 80 ℃, adjusting the output power of the electric heating equipment to be 100%;
when the temperature of the power control module is higher than 80 ℃ and lower than 95 ℃, the output power of the electric heating equipment is adjusted to be 60 percent;
and when the temperature of the power control module is higher than 95 ℃, adjusting the output power of the electric heating equipment to be 0.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the electric heating equipment is provided with three temperature sensors, namely a power temperature sensor, an inlet water temperature sensor and an outlet water temperature sensor, and can monitor the temperature of a power control module and the temperature of inlet and outlet water in real time; carrying out PID operation according to the target inlet water temperature and the current actual inlet water temperature, determining the output power of the electric heating equipment, adjusting the heating degree of the electric heating pipe through a power control module, and ensuring that the current actual inlet water temperature is equal to the target inlet water temperature; the power control module heats according to the requirement, keeps the water temperature constant and the output power stable, and avoids the waste of energy; no longer set up water storage tank, the heat that generates heat is direct to be carried the heating region fast through the medium, avoids the calorific loss of heat-retaining, improves the efficiency, because there is not the heat-retaining demand, consequently can reduce heating element temperature and improve the medium velocity of flow, can show through suitable velocity of flow and heating element temperature, medium temperature and reduce scale deposit speed, improves heat exchange efficiency and promotes electric heating pipe's life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a control structure of an electric heating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a heat dissipation device according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for controlling an electric heating apparatus according to an embodiment of the present invention;
reference numerals: 1. an electric heating tube; 2. a flow pipe; 3. an inlet water temperature sensor; 4. an effluent temperature sensor; 5. a power control module; 6. a power temperature sensor; 7. an exhaust nozzle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide electric heating equipment and a control method thereof, which can adjust the heating power of the electric heating equipment in real time according to the temperature of inlet and outlet water, realize variable frequency control while ensuring the heating effect, and have the characteristics of energy conservation, high efficiency, high intelligent control level and long service life.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-2, an electric heating apparatus according to an embodiment of the present invention includes: the heat dissipation device comprises a microcomputer and heat dissipation devices arranged in each room, wherein each heat dissipation device comprises an electric heating pipe 1 and a water flowing pipeline 2 arranged in the electric heating pipe 1, the electric heating pipe 1 is electrically connected with a power control module 5, a power temperature sensor 6 is arranged on the power control module 5, and the power temperature sensor 6 is used for collecting the temperature of the power control module 5; a water inlet and a water outlet of the water flowing pipeline 2 are respectively provided with a water inlet temperature sensor 3 and a water outlet temperature sensor 4, the water inlet temperature sensor 3 is used for collecting real-time water inlet temperature, and the water outlet temperature sensor 4 is used for collecting real-time water outlet temperature; the heat dissipation device is also provided with a valve and a valve opening monitoring device, and the valve opening monitoring device is used for acquiring the valve opening;
the microcomputer is electrically connected with the power control module, the power temperature sensor, the water inlet temperature sensor, the water outlet temperature sensor and the valve opening monitoring device respectively.
The heat dissipation device is an electric radiator, an exhaust pipeline communicated with the water flow pipeline is arranged on the heat dissipation device, and an exhaust nozzle 7 is arranged on the exhaust pipeline.
The water flowing pipeline of the heat radiating device is U-shaped, the water inlet and outlet direction is downward inlet and downward outlet, and the upper part is an exhaust pipeline.
In the prior art, the temperature of a heat-conducting medium of heating equipment is only controlled, and the heat-conducting medium does not have a constant temperature function; the system does not have the function of independently controlling the temperature of each room, does not have the function of communicating with each room temperature detection controller, and also does not have the function of carrying out real-time frequency conversion control according to the heat required by each room; the microcomputer has the communication function with the room temperature sensors, obtains the heat required by each room by acquiring the conditions of each room, and then performs frequency conversion control heating according to the requirements, so that the microcomputer is always in a high heating efficiency and a high comfort level, and energy waste is avoided.
The microcomputer is provided with the colored touch-sensitive screen, and the display content is extremely abundant, for example power control module's temperature, real-time business turn over water temperature to can input the target temperature of intaking, compare with prior art's charactron + touch button structure, the operation mode is similar to the difference of smart mobile phone and function machine.
The invention greatly reduces the volume through the microcomputer, the prior art scheme has larger volume generally, the minimum volume is 2 times of the scheme of the prior art, and the individual volume can reach more than 3 times.
In addition, the existing power control scheme is that in the scheme 1, the on-off control of the relay does not have the frequency conversion function; the scheme 2 is alternating current chopping frequency conversion, and has the defects of generation of a lot of harmonic waves, low power factor and large pressure on a power grid; the scheme 3 is high-frequency induction heating, and has the defects that the power components are seriously heated due to a high-frequency switch, the efficiency is reduced, the current waveform caused by ACDC conversion is in a high-peak mode, the difference with the voltage waveform is large, the power factor is low, the electromagnetic radiation caused by high-frequency conversion is high, and the high-frequency induction heating is not beneficial to the health of a human body; the invention adopts the power regulation mode for frequency conversion, the current waveform is consistent with the voltage waveform, and the power factor is extremely high; because the low-frequency conversion is about 5Hz, the heat loss is small, but through the additional design, the part of heat is also used for heating the heat-conducting medium, the heat loss is basically avoided, and the energy efficiency ratio is extremely high.
The invention also provides a control method of the electric heating equipment, which is applied to the electric heating equipment and comprises the following steps:
s1, acquiring the total heat demand of each room;
s2, acquiring the real-time inlet water temperature and the real-time outlet water temperature of the heat dissipation device;
s3, obtaining a target inlet water temperature of the heat dissipation device according to the total required heat, the real-time inlet water temperature and the real-time outlet water temperature based on a PID algorithm;
and S4, based on the PID algorithm, adjusting the output power of the electric heating equipment according to the difference between the target inlet water temperature and the real-time inlet water temperature.
Wherein, in the step S1, the total required heat of each room is obtained, and the method specifically includes the following steps:
s101, acquiring the indoor temperature of each room and setting a target temperature;
s102, obtaining the valve opening of a heat dissipation device in each room;
s103, based on a PID algorithm, obtaining the heat required by each room according to the indoor temperature, the target temperature and the valve opening degree;
and S104, calculating the sum of the heat demand of each room to obtain the total heat demand of each room.
Step S103, based on the PID algorithm, obtaining the heat required by each room according to the indoor temperature, the target temperature, and the valve opening, and specifically includes:
PID algorithm 1: the heat demand of each room (difference between indoor temperature and target temperature) and the valve opening degree.
The empirical conversion value is a constant, which is a fixed constant obtained through a series of experiments, and may be set to 120, for example.
Wherein, step S3, based on the PID algorithm, according to total demand heat, real-time temperature of intaking and real-time temperature of going out, obtains heat abstractor' S target temperature of intaking, specifically includes:
to achieve a constant room temperature, the total heat demand and the total heat removal are equal, and the heat removal is in turn related to the real-time inlet water temperature and the real-time outlet water temperature. And calculating the target water inlet temperature by using the total required heat, namely P (target water inlet temperature-real-time water inlet temperature) + I delta (target water inlet temperature-real-time water inlet temperature) + D delta (target water inlet temperature-real-time water inlet temperature).
Wherein, step S4, based on the PID algorithm, adjusts the output power of the electric heating equipment according to the difference between the target inlet water temperature and the real-time inlet water temperature, and specifically includes:
when the difference between the target water inlet temperature and the real-time water inlet temperature is less than 10 ℃, adjusting the output power of the electric heating equipment to 100%;
when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 10 ℃ and less than 20 ℃, adjusting the output power of the electric heating equipment to 60%;
and when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 20 ℃, adjusting the output power of the electric heating equipment to be 0.
Wherein, after the step S4, the method further includes: s5, adjusting the output power of the electric heating device according to the temperature of the power control module, specifically:
when the temperature of the power control module is less than 80 ℃, adjusting the output power of the electric heating equipment to be 100%;
when the temperature of the power control module is higher than 80 ℃ and lower than 95 ℃, the output power of the electric heating equipment is adjusted to be 60 percent;
and when the temperature of the power control module is higher than 95 ℃, adjusting the output power of the electric heating equipment to be 0.
Under normal conditions, the output power of the electric heating equipment is adjusted according to the temperature difference of inlet and outlet water, and the temperature of the power control module is within 80 degrees of a safety threshold at the moment; when the temperature of the power control module exceeds 80 ℃ and is lower than 95 ℃, reducing the power and ensuring that the temperature of the power control module does not exceed 95 ℃; when the power control module temperature exceeds 95 degrees, the power output is turned off, and the power control module is started again when the temperature of the power control module is reduced to 80 degrees.
According to the control method of the electric heating equipment, the heat productivity of the room is changed according to the relation between the target inlet water temperature and the current actual inlet water temperature, the changed heat productivity ensures the stability of the temperature in the room, and avoids sudden cooling and sudden heating, so that the heat required by the room needs to be calculated to match the heat; if the electric heating equipment is normal, controlling the real-time inlet water temperature to be stabilized near the target inlet water temperature; when the water inlet temperature sensor fails, the water inlet temperature sensor is converted into a water outlet temperature sensor and is maintained near the target water inlet temperature; and if the temperature difference of the water temperature is too large, controlling the average value of the temperature of the water temperature and the temperature of the water temperature to be close to the target water inlet temperature. The power control module heats according to the requirement, keeps the water temperature constant and the output power stable, and avoids the waste of energy; no longer set up water storage tank, the heat that generates heat is direct to be carried the heating region fast through the medium, avoids the calorific loss of heat-retaining, improves the efficiency, because there is not the heat-retaining demand, consequently can reduce heating element temperature and improve the medium velocity of flow, can show through suitable velocity of flow and heating element temperature, medium temperature and reduce scale deposit speed, improves heat exchange efficiency and promotes electric heating pipe's life.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (7)

1. An electric heating apparatus, comprising: the heat dissipation device comprises an electric heating pipe and a water flowing pipeline arranged in the electric heating pipe, the electric heating pipe is electrically connected with a power control module, a power temperature sensor is arranged on the power control module, and the power temperature sensor is used for collecting the temperature of the power control module; a water inlet and a water outlet of the water flowing pipeline are respectively provided with a water inlet temperature sensor and a water outlet temperature sensor, the water inlet temperature sensor is used for acquiring real-time water inlet temperature, and the water outlet temperature sensor is used for acquiring real-time water outlet temperature; the heat dissipation device is also provided with a valve and a valve opening monitoring device, and the valve opening monitoring device is used for acquiring the valve opening;
the microcomputer is electrically connected with the power control module, the power temperature sensor, the water inlet temperature sensor, the water outlet temperature sensor and the valve opening monitoring device respectively.
2. The electric heating apparatus according to claim 1, wherein the heat sink is provided with an exhaust duct communicating with the water flow duct, and the exhaust duct is provided with an exhaust nozzle.
3. An electric heating apparatus control method applied to the electric heating apparatus according to any one of claims 1 to 2, comprising the steps of:
s1, acquiring the total heat demand of each room;
s2, acquiring the real-time inlet water temperature and the real-time outlet water temperature of the heat dissipation device;
s3, obtaining a target inlet water temperature of the heat dissipation device according to the total required heat, the real-time inlet water temperature and the real-time outlet water temperature based on a PID algorithm;
and S4, based on the PID algorithm, adjusting the output power of the electric heating equipment according to the difference between the target inlet water temperature and the real-time inlet water temperature.
4. The method for controlling an electric heating apparatus according to claim 3, wherein the step S1 of obtaining the total required heat of each room includes the following steps:
s101, acquiring the indoor temperature of each room and setting a target temperature;
s102, obtaining the valve opening of a heat dissipation device in each room;
s103, based on a PID algorithm, obtaining the heat required by each room according to the indoor temperature, the target temperature and the valve opening degree;
and S104, calculating the sum of the heat demand of each room to obtain the total heat demand of each room.
5. The method of controlling an electric heating apparatus according to claim 4, wherein the step S103 of obtaining the required heat of each room according to the indoor temperature, the target temperature and the valve opening degree based on a PID algorithm specifically comprises:
the heat demand of each room (difference between indoor temperature and target temperature) and the valve opening degree.
6. The method of claim 3, wherein the step S4 of adjusting the output power of the electric heating equipment according to the difference between the target inlet water temperature and the real-time inlet water temperature based on the PID algorithm specifically comprises:
when the difference between the target water inlet temperature and the real-time water inlet temperature is less than 10 ℃, adjusting the output power of the electric heating equipment to 100%;
when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 10 ℃ and less than 20 ℃, adjusting the output power of the electric heating equipment to 60%;
and when the difference between the target inlet water temperature and the real-time inlet water temperature is greater than 20 ℃, adjusting the output power of the electric heating equipment to be 0.
7. The method of controlling an electric heating apparatus according to claim 3, further comprising, after step S4: in step S5, the output power of the electric heating equipment is adjusted according to the temperature of the power control module, specifically:
when the temperature of the power control module is less than 80 ℃, adjusting the output power of the electric heating equipment to be 100%;
when the temperature of the power control module is higher than 80 ℃ and lower than 95 ℃, the output power of the electric heating equipment is adjusted to be 60 percent;
and when the temperature of the power control module is higher than 95 ℃, adjusting the output power of the electric heating equipment to be 0.
CN202010310560.2A 2020-04-20 2020-04-20 Electric heating equipment and control method thereof Pending CN111442328A (en)

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WO2023280306A1 (en) * 2021-07-09 2023-01-12 谷泽竑 Control method and apparatus for centralized cooling/heating system
CN114754464A (en) * 2022-04-18 2022-07-15 青岛海尔空调电子有限公司 Air conditioner control method, system, device, medium and air conditioner
CN114754464B (en) * 2022-04-18 2023-11-24 青岛海尔空调电子有限公司 Air conditioner control method, system, device, medium and air conditioner

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