CN116336674A - Control method and device of gas water heater and gas water heater - Google Patents
Control method and device of gas water heater and gas water heater Download PDFInfo
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- CN116336674A CN116336674A CN202210772479.5A CN202210772479A CN116336674A CN 116336674 A CN116336674 A CN 116336674A CN 202210772479 A CN202210772479 A CN 202210772479A CN 116336674 A CN116336674 A CN 116336674A
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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
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
- F24H15/325—Control of valves of by-pass valves
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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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
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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
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/174—Supplying heated water with desired temperature or desired range of temperature
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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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/215—Temperature of the water before heating
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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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
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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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
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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
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Computer Hardware Design (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The invention discloses a control method and device of a gas water heater and the gas water heater, comprising the following steps: obtaining the required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user; determining a target heating temperature according to a required heat load, a water inlet temperature and a set temperature, wherein the target heating temperature is the expected water outlet temperature of a heat exchanger of the gas water heater and is greater than or equal to a dew point temperature corresponding to the required heat load; obtaining the target flow of the bypass water proportional valve according to the total water inflow, the water inflow temperature, the target heating temperature and the set temperature, wherein the target flow is the split flow of the total water inflow; and adjusting the opening degree of the bypass water proportional valve according to the target flow. The embodiment can reduce condensate water generation, improve constant temperature performance and accurately control the opening of the bypass water proportional valve.
Description
Technical Field
The invention relates to the technical field of water heater control, in particular to a gas water heater control method and device and a gas water heater.
Background
The gas water heater is provided with a heat exchanger in which cold water flowing in the heat exchanger is heated by combustion of gas, and has an advantage of instant heating over the water storage type electric water heater, so that the gas water heater is widely used.
At present, in the gas water heater, a cold water pipe is connected to a water outlet pipe of a heat exchanger through a bypass water proportional valve so as to realize that hot water and cold water are mixed to obtain hot water with a temperature required by a user. However, because the control of factors such as the opening degree of the bypass water proportional valve is not proper in the running process of the water heater, when cold water enters the straight pipe of the heat exchanger, the situation that more condensed water is generated when the burnt high-temperature gas encounters the straight pipe still easily exists, so that the effect of preventing the condensed water is not achieved well.
Disclosure of Invention
The invention provides a control method and device of a gas water heater and the gas water heater, which are used for solving the problem that the bypass water proportion opening degree in the existing gas water heater is not properly controlled so as to reduce the poor effect of condensed water.
In a first aspect, the present invention provides a control method for a gas water heater, a bypass pipe is provided between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a bypass water proportional valve, the bypass water proportional valve is used for adjusting water flow of the bypass pipe, and the method includes:
Obtaining the required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user;
determining a target heating temperature according to the required heat load, the water inlet temperature and the set temperature, wherein the target heating temperature is the expected water outlet temperature of a heat exchanger of the gas water heater and is greater than or equal to the dew point temperature corresponding to the required heat load;
obtaining the target flow of the bypass water proportional valve according to the total water inflow, the water inflow temperature, the target heating temperature and the set temperature, wherein the target flow is the split flow of the total water inflow;
and adjusting the opening degree of the bypass water proportional valve according to the target flow.
In a second aspect, the present invention provides a gas water heater control device, a bypass pipe is provided between a water outlet pipe and a water inlet pipe of a gas water heater, the bypass pipe is provided with a bypass water proportional valve, the bypass water proportional valve is used for adjusting water flow of the bypass pipe, and the gas water heater control device comprises:
the demand heat load calculation module is used for obtaining the demand heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user;
The target heating temperature determining module is used for determining a target heating temperature according to the required heat load, the water inlet temperature and the set temperature, wherein the target heating temperature is the expected water outlet temperature of the heat exchanger of the gas water heater and is greater than or equal to the dew point temperature corresponding to the required heat load;
the target flow determining module is used for obtaining the target flow of the bypass water proportional valve according to the total water inflow, the water inflow temperature, the target heating temperature and the set temperature, wherein the target flow is the split flow of the total water inflow;
and the bypass water proportional valve adjusting module is used for adjusting the opening degree of the bypass water proportional valve according to the target flow.
In a third aspect, the present invention provides a gas water heater, a bypass pipe is provided between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a bypass water proportional valve, the bypass water proportional valve is used for adjusting water flow of the bypass pipe, and the gas water heater includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the gas water heater control method according to the first aspect of the present invention.
According to the embodiment, the target heating temperature is determined according to a plurality of parameter conditions such as a required heat load, a water inlet temperature and a set temperature, the target heating temperature is larger than or equal to a dew point temperature corresponding to the required heat load, the energy conservation of the required heat load is further based, the target flow of the bypass water proportional valve is obtained according to the total water inlet amount, the water inlet temperature, the target heating temperature and the set temperature, and the opening of the bypass water proportional valve is controlled based on the target flow. Because the demand heat load is different and the dew point temperature is also different, and under the same demand heat load, the setting temperature is different with the temperature of intaking, the flue gas temperature that produces of burning in the heat exchanger is also different along with this, on the one hand, the target heating temperature is greater than or equal to the dew point temperature that the demand heat load corresponds, can make the straight tube temperature be greater than or equal to the dew point temperature of the flue gas that gas combustion produced, the condensate water production has been reduced, can help solving its problem that influences the use such as constant temperature goes out because of reducing condensate water effect is not good enough, improve constant temperature performance, on the other hand, can make the target heating temperature more accurate, thereby the aperture control precision to bypass water proportional valve is higher, the heating temperature that leads to the heat exchanger after the bypass water proportional valve reposition of redundant personnel is too high and arouses the overtemperature protection.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of a gas water heater according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gas water heater according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling a gas water heater according to a second embodiment of the present invention;
FIG. 4 is a flow chart of determining a target heating temperature in an embodiment of the invention;
FIG. 5 is a schematic diagram of a gas water heater control device according to a third embodiment of the present invention;
fig. 6 is a schematic structural diagram of a gas water heater according to a fourth embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Fig. 1 is a flowchart of a gas water heater control method according to an embodiment of the present invention, where the method may be applied to control a bypass water ratio of a water heater to avoid a condensed water, and the method may be performed by a gas water heater control device, where the gas water heater control device may be implemented in hardware and/or software, and the gas water heater control device may be configured in a gas water heater, as shown in fig. 1, and the gas water heater control method includes:
s101, obtaining the required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user.
As shown in fig. 2, in the gas water heater of this embodiment, cold water flows into the heat exchanger 6 after passing through the water flow sensor 1, the water inlet temperature sensor 2 and the main water proportional valve 3 in sequence, the cold water flows through the high temperature sensor 7 after being heated in the heat exchanger 6 in sequence, meanwhile, the cold water flows out of the bypass water proportional valve 4 and is mixed with hot water flowing out of the high temperature sensor 7, hot water with a temperature required by a user is obtained, and the hot water is output to a water consumption point after passing through the water outlet temperature sensor 9.
In this embodiment, the total water inflow may be the water flow measured by the water flow sensor 1, the water inflow temperature may be the temperature collected by the water inflow temperature sensor 2, the set temperature may be the required temperature set by the user, the user may set the set temperature through the panel of the gas water heater, and the set temperature may be displayed in the display 5.
The required heat load may be the heat required for the gas water heater to heat the water of the total inflow rate from the inflow temperature to the set temperature, and in particular, the required heat load Q1 may be calculated by the following formula:
Q1＝S×(T0-T1)
in the above formula, S is the total inflow water flow measured by the water flow sensor 1, T0 is the set temperature of the user, and T1 is the inflow water temperature collected by the inflow water temperature sensor 2.
S102, determining a target heating temperature according to the required heat load, the water inlet temperature and the set temperature, wherein the target heating temperature is the expected water outlet temperature of a heat exchanger of the gas water heater and is greater than or equal to the dew point temperature corresponding to the required heat load.
In this embodiment, the target heating temperature is a desired outlet water temperature of the heat exchanger of the gas water heater, and the target heating temperature is greater than or equal to a dew point temperature corresponding to the required heat load. As shown in fig. 2, the target heating temperature is a temperature that the high temperature sensor 7 is expected to collect, that is, a temperature at which the water in the heat exchanger is heated.
In one example, when the gas water heater burns gas with different heat loads, the dew point temperature of flue gas generated by the combustion is different, and the corresponding relationship between the heat load, the water inlet temperature, the set temperature and the target heating temperature can be preset, so that when the gas water heater burns with the required heat load, the temperature of flue gas generated when cold water is heated from the water inlet temperature to the target heating temperature is greater than or equal to the dew point temperature. For example, when the heat load is set to Q1 in advance, if the set temperature is higher than 55 degrees celsius, the target heating temperature may be 60 degrees celsius or 65 degrees celsius when the water inflow temperature is lower than 15 degrees celsius, or 55 degrees celsius when the water inflow temperature is higher than 15 degrees celsius and lower than 30 degrees celsius, or the like. The target heating temperature can be directly set, or can be determined according to the required heat load, the water inlet temperature and the set temperature of the user, and the determining mode of the target heating temperature is not limited in this embodiment.
In practical application, the corresponding relationship between the heat load, the water inlet temperature, the set temperature and the target heating temperature may be a preset comparison table, or may be a judgment logic for obtaining the target heating temperature through the required heat load, the water inlet temperature and the set temperature.
S103, obtaining the target flow of the bypass water proportional valve according to the total inflow water flow, the inflow water temperature, the target heating temperature and the set temperature, wherein the target flow is the diversion flow of the total inflow water flow.
As can be seen from the calculation formula of the demand heat load Q1 in S101, the demand heat load Q1 may be the heat required for heating water from the inlet water temperature T1 to the set temperature T0 when the total inlet water flow is S, in order to avoid condensed water generated by the burning flue gas encountering the straight pipe, the temperature of the water in the straight pipe needs to be heated to the target heating temperature, and the target heating temperature T2 is higher than the dew point temperature of the flue gas generated by the burning of the gas water heater with the demand heat load Q1, under the condition that the demand heat load Q1 is unchanged, according to energy conservation, the water flow of the cold water flowing into the straight pipe needs to be reduced, that is, a part of the cold water is split through the bypass proportional valve 4, so that the amount of the heated cold water becomes smaller, the cold water is heated to the higher target heating temperature, and the hot water with the set temperature is obtained after the cold water flowing through the bypass proportional valve 4 is mixed with the hot water flowing from the high temperature sensor 7.
In one example, a water flow rate at which the demand heat load Q1 can heat cold water from the intake water temperature T1 to the target heating temperature T2 may be calculated, and a difference between the total intake water flow rate S and the water flow rate is the target flow rate of the bypass proportional valve 4.
S104, adjusting the opening degree of the bypass water proportional valve according to the target flow.
Specifically, the flow rate of the bypass water proportional valve is positively correlated with the opening, the opening of the bypass water proportional valve may be adjusted by an adjusting mechanism, so that the flow rate of the water of the bypass water proportional valve is adjusted to the target flow rate, in one example, the adjusting mechanism may be an electromagnetic valve, the opening of the bypass water proportional valve may be adjusted by controlling the current flowing through the electromagnetic valve, the adjusting mechanism may also be a servo motor, and the opening of the bypass water proportional valve may be adjusted by controlling the number of revolutions of the servo motor.
According to the embodiment, after the required heat load is determined, the target heating temperature is determined according to a plurality of parameter conditions such as the required heat load, the water inlet temperature and the set temperature, the target heating temperature is larger than or equal to the dew point temperature corresponding to the required heat load, the target flow of the bypass water proportional valve is obtained according to the total water inlet amount, the water inlet temperature, the target heating temperature and the set temperature based on the energy conservation of the required heat load so as to control the bypass water proportional valve, on one hand, the target heating temperature is larger than or equal to the dew point temperature corresponding to the required heat load, the temperature of a straight pipe is larger than or equal to the dew point temperature of flue gas generated by combustion of fuel gas, the condensate water is reduced, the problem that the use is affected due to poor effect of reducing the condensate water is solved, the constant temperature water outlet is facilitated to be influenced, the constant temperature performance is improved, on the other hand, the target heating temperature is enabled to be more accurate, the opening degree control precision of the bypass water proportional valve is higher, and the overtemperature protection caused by the fact that the heating temperature of a heat exchanger is too high after the bypass water proportional valve is shunted is reduced.
Example two
Fig. 3 is a flowchart of a gas water heater control method according to a second embodiment of the present invention, where the optimization is performed based on the first embodiment of the present invention, and as shown in fig. 3, the gas water heater control method includes:
s201, obtaining the required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user.
S202, judging whether the required heat load is larger than the rated heat load of the gas water heater.
Each gas water heater has a rated heat load due to the relation of the structure, the attribute of the heat exchanger and the like, the rated heat load can be the highest heat load under the premise of safe operation of the gas water heater, whether the required heat load Q1 calculated in the step S201 is larger than the rated heat load of the gas water heater can be judged, if yes, the step S203-S204 is executed, and if not, the step S205 is executed.
S203, adjusting the total water inlet flow according to the rated heat load, the set temperature and the water inlet temperature.
When the total inflow is too large, the heat load required to heat the cold water from the inflow temperature to the user' S set temperature may exceed the rated heat load of the gas water heater, and the total inflow needs to be reduced, specifically, the adjusted total inflow S may be calculated by the following formula:
S＝Q0/(T0-T1)
In the above formula, Q0 is rated heat load, T0 is set temperature of a user, and T1 is water inlet temperature.
S204, controlling the opening degree of the main water proportional valve according to the adjusted total inflow water flow so as to enable the required heat load to reach the rated heat load.
Specifically, the opening degree of the main water proportional valve may be adjusted by the adjusting mechanism so that the required heat load required by the total inflow water flow rate of the cold water after adjustment is equal to the rated heat load, for example, the current magnitude of the solenoid valve of the main water proportional valve is controlled to adjust the opening degree of the main water proportional valve so that the total inflow water flow rate of the cold water is reduced.
It should be noted that, when the calculated required heat load Q1 is greater than the rated heat load Q0, the required heat load is equal to the rated heat load in the subsequent calculation, and the total intake water flow is the adjusted total intake water flow.
According to the embodiment, whether the required heat load is larger than the rated heat load of the gas water heater is judged, if yes, the opening of the main water proportional valve is adjusted to reduce the total water inlet flow, so that the required heat load is equal to the rated heat load, on one hand, the situation that hot water with the temperature required by a user cannot be output when the required heat load is larger than the rated heat load due to the fact that the temperature of cold water is too low is avoided, the total water inlet flow is actively reduced to ensure the water outlet temperature, hot water with the temperature required by the user can be output after the total water inlet flow is adjusted, on the other hand, the temperature of water in the straight pipe is ensured to reach the target heating temperature, the temperature of the straight pipe is improved, and condensed water cannot be generated when flue gas generated by gas combustion contacts the straight pipe.
S205, confirming a first temperature range corresponding to the water inlet temperature and a second temperature range corresponding to the set temperature in the confirmation corresponding relation according to the required heat load.
In this embodiment, a plurality of first temperature ranges and a plurality of second temperature ranges may be set for each required heat load, where the first temperature ranges are used to determine a temperature range to which the inlet water temperature belongs, the second temperature ranges are used to determine a temperature range in which the set temperature belongs, and combinations of different first temperature ranges and second temperature ranges correspond to a temperature to be determined, and the temperature to be determined is the target heating temperature.
After determining the required heat load, a plurality of first temperature ranges and a plurality of second temperature ranges of the required heat load may be acquired, and a first temperature range to which the inlet water temperature belongs and a second temperature range to which the set temperature belongs may be determined, and in one example, the correspondence relationship is confirmed as shown in the following lookup table:
as shown in the comparison table, the first temperature range comprises three first temperature ranges of T1 less than or equal to 15 ℃, 15 ℃ less than T1 less than 30 ℃, T1 more than or equal to 30 ℃, the second temperature range comprises two temperature ranges of T0 less than 55 ℃ and T0 more than or equal to 55 ℃, the first temperature range corresponding to the water inlet temperature is determined to be 15 ℃ less than T1 less than 30 ℃ under the condition that the water inlet temperature is 25 ℃ and the set temperature is 50 ℃, and the second temperature range corresponding to the set temperature is determined to be T0 less than 55 ℃.
The above are merely examples of the first temperature range and the second temperature range, and a person skilled in the art may set different first temperature ranges and second temperature ranges in practical applications.
S206, taking the temperature to be confirmed corresponding to the corresponding first temperature range and the corresponding second temperature range as a target heating temperature.
As shown in the above comparative table, assuming that the water inlet temperature is 25 ℃, the set temperature is 50 ℃, it is determined that the first temperature range corresponding to the water inlet temperature is 15 ℃ < T1 < 30 ℃, the second temperature range corresponding to the set temperature is T0 < 55 ℃, the first temperature range is 15 ℃ < T1 < 30 ℃ and the target heating temperature corresponding to the second temperature range is T0 < 55 ℃ is 55 ℃.
In an alternative embodiment, in the confirmation of the correspondence according to the required heat load, if the set temperature is greater than the second temperature range with the highest temperature value, the target heating temperature is confirmed to be the set temperature, and the bypass water proportional valve is closed, specifically, as shown in the above-mentioned comparison table, assuming that the set temperature is 65 ℃, the second temperature range to which the set temperature belongs is T0 Σ or more 55 ℃, as shown in the above-mentioned comparison table, the target heating temperature is equal to the set temperature T0, that is, the target heating temperature is equal to 65 ℃, so that when the set temperature is higher, the set temperature is already higher than the dew point temperature, the target heating temperature is directly set to be the set temperature, and the bypass water proportional valve is not required to shunt the cold water.
In another alternative embodiment, in the confirmation of the correspondence according to the required heat load, if the set temperature is less than or equal to the second temperature range with the highest temperature value, but the inlet water temperature is greater than the first temperature range with the highest temperature value, the target heating temperature is confirmed to be the set temperature, and the bypass water proportional valve is closed, specifically, as shown in the above-mentioned comparison table, assuming that the set temperature is 50 ℃, the inlet water temperature is 35 ℃, the second temperature range to which the set temperature belongs is T0 < 55 ℃, and the inlet water temperature is 35 ℃ and the first temperature range T1 with the highest temperature value is equal to or greater than 30 ℃, as shown in the above-mentioned comparison table, the target heating temperature is equal to the set temperature T0, that is, the target heating temperature is equal to 50 ℃, so that when the inlet water temperature is higher than the set temperature, the required heat load for heating cold water from the inlet water temperature to the set temperature is not higher, the corresponding dew point temperature is low, and the inlet water is higher, and the cold water can be directly heated to the set temperature without generating condensed water, and the cold water does not need to be shunted through the bypass water proportional valve.
In an alternative embodiment, as shown in fig. 4, the target heating temperature may also be determined by preset decision logic:
S1, judging whether the set temperature is larger than a preset first temperature.
For example, the first temperature may be a higher temperature, for example, may be 55 ℃, specifically may be determined according to the magnitude of the demand load, and it is determined whether the set temperature T0 set by the user is greater than 55 ℃, if yes, S2 is executed, and if not, S3 is executed.
S2, the target heating temperature is equal to the set temperature.
If the set temperature of the user is higher than the first temperature, for example, the set temperature is higher than 55 ℃, the temperature of hot water in the straight pipe of the gas water heater is at least higher than 55 ℃, the temperature of the straight pipe is high enough at the moment, condensed water is not generated when smoke generated by gas combustion contacts the straight pipe, a bypass water proportional valve is not needed, the bypass water proportional valve can be controlled to be closed, and meanwhile, the target heating temperature is determined to be equal to the set temperature.
S3, judging whether the water inlet temperature is smaller than a preset second temperature.
In one example, the second temperature may be a lower temperature, for example, may be 15 ℃, when the set temperature is less than the preset first temperature, it needs to be further determined whether the water inlet temperature of the cold water is less than the preset second temperature, if yes, S4 is executed, and if not, S5 is executed.
S4, the target heating temperature is equal to a preset third temperature.
Because the temperature of intaking is less than the second temperature, intake temperature is too low, in order to avoid straight tube temperature too low, gas combustion's flue gas contacts the straight tube and produces the comdenstion water, can be with the higher of target heating temperature setting, for example, the third temperature can be 60 ℃ or 65 ℃ etc. under the fixed condition of demand heat load Q1, the target heating temperature equals the third temperature, the cold water that flows into the straight tube when higher target heating temperature is less, the hot water after heating can reach target heating temperature, the straight tube temperature is also higher, be difficult for producing the comdenstion water.
S5, judging whether the water inlet temperature is smaller than a preset fourth temperature.
When the temperature of the incoming water is higher than the second temperature, for example, higher than 15 ℃, it is indicated that the temperature of the cold water is not too low, and it can be further judged whether the temperature of the cold water is higher, then a fourth temperature, for example, 30 ℃, can be set to judge whether the temperature of the incoming water is lower than the fourth temperature, if yes, S6 is executed, and if no, S7 is executed.
S6, the target heating temperature is equal to the first temperature.
If the inlet water temperature is greater than the second temperature and less than the fourth temperature, e.g., the inlet water temperature is greater than 15 ℃ and less than 30 ℃, i.e., the inlet water temperature is not too low nor too high, the target heating temperature may be set equal to a first temperature that is less than the third temperature, which may be 65 ℃ for example, and the first temperature may be 55 ℃, so that the flow rate of cold water flowing into the straight pipe may be controlled by the target heating temperature.
S7, the target heating temperature is equal to the set temperature.
If the intake water temperature is greater than the fourth temperature, for example, the intake water temperature is greater than 30 ℃, the intake water temperature is less different from the temperature of the flue gas condensation inhibiting the combustion of the fuel gas, the bypass water proportional valve is not required to shunt the cold water, the bypass water proportional valve can be controlled to be closed, and the target heating temperature is directly set to the set temperature.
According to the embodiment, the target heating temperature is determined through the water inlet temperature and the set temperature, the water inlet temperature of cold water and the set temperature of a user are fully considered, the target heating temperature is determined according to actual conditions, the target flow of the bypass water proportional valve calculated through the target heating temperature is more accurate, and the opening of the bypass water proportional valve is accurately controlled.
Although the above process of determining the target heating temperature is described by way of example, in practical application, a person skilled in the art may directly set a fixed target heating temperature, or set a mapping table (such as the above-mentioned comparison table) of the inlet water temperature and the set temperature and the target heating temperature, and the method of determining the target heating temperature is not limited by searching the mapping table for the target heating temperature matched with the inlet water temperature and the set temperature.
S207, obtaining the target flow of the bypass water proportional valve according to the total inflow water flow, the inflow water temperature, the target heating temperature and the set temperature.
In an alternative embodiment, a first difference value may be obtained by calculating a difference value between the target heating temperature and the set temperature, a second difference value may be obtained by calculating a difference value between the target heating temperature and the inlet water temperature, a ratio of the first difference value to the second difference value may be calculated, and a product of the calculated ratio and the total inlet water flow may be obtained to obtain a target flow of the bypass water proportional valve, that is, a calculation formula of the target flow S1 of the bypass water proportional valve is as follows:
S1＝(T2-T0)/(T2-T1)×S
in the above formula, T2 is a target heating temperature, T0 is a set temperature, T1 is a water inlet temperature, and S is a total water inlet flow.
The calculation formula of the target flow S1 can be deduced according to the principle of conservation of energy, that is, the set temperature of the user is T0, the total inflow flow is S, the inflow temperature is T1, and under the condition that the thermal efficiency is not changed, the thermal load of heating the water with the flow of the total inflow flow S from the inflow temperature T1 to the set temperature T0 is as follows:
S×(T0-T1)×c
c is the specific heat capacity of water.
If the target flow rate of the bypass water proportional valve is S1 and the target heating temperature is T2, the heat absorbed by the water flowing through the heat exchanger is:
(T2-T1)×(S-S1)×c
because of energy conservation, there are:
S×(T0-T1)×c＝(T2-T1)×(S-S1)×c
The calculation gives s1= (T2-T0)/(T2-T1) ×s.
In another alternative embodiment, a water flow rate at which the demand heat load Q1 can heat the cold water from the inlet water temperature T1 to the target heating temperature T2 may also be calculated, and the difference between the total inlet water flow rate S and the water flow rate is the target flow rate S1 of the bypass proportional valve.
S208, adjusting the opening degree of the bypass water proportional valve according to the target flow.
After the required heat load is determined, in the corresponding relationship of the determination, the first temperature range corresponding to the water inlet temperature and the second temperature range corresponding to the set temperature are determined, the temperature to be determined corresponding to the first temperature range and the second temperature range is taken as the target heating temperature, the bypass water proportional valve is controlled by obtaining the target flow of the bypass water proportional valve based on the required heat load and according to the total water inlet flow, the water inlet temperature, the target heating temperature and the set temperature, on one hand, the target heating temperature is greater than or equal to the dew point temperature corresponding to the required heat load, the straight pipe temperature is greater than or equal to the dew point temperature of flue gas generated by gas combustion, the generation of condensed water is reduced, the problem that the use is affected by the influence of constant temperature water outlet due to poor effect of the condensed water is solved, the constant temperature performance is improved, on the other hand, the target heating temperature is more accurate, the opening degree control precision of the bypass water proportional valve is higher, and the overtemperature protection caused by the fact that the heating temperature of the heat exchanger is too high after the bypass water proportional valve is shunted is reduced.
In addition, in the confirmation corresponding relation of the preset demand heat load, the target heating temperature is determined through the water inlet temperature and the set temperature, the calculated amount is small, the efficiency of confirming the target heating temperature is high, and the bypass water proportional valve can be quickly adjusted.
In an alternative embodiment, after S208, it may further include:
s209, acquiring a first outlet water temperature and a change rate of the first outlet water temperature of the heat exchanger.
I.e. after opening the gas valve, the heat exchanger heats the cold water, and the first outlet water temperature of the heat exchanger can be collected by the high temperature sensor 7 according to a preset period and the rate of change of the first outlet water temperature can be calculated, for example, the first outlet water temperature of the heat exchanger is collected according to a period of 1 second, and the rate of change of the first outlet water temperature of two adjacent periods is calculated.
S210, calculating a third difference value between the first outlet water temperature and the target heating temperature.
The target heating temperature is the expected hot water temperature after the heat exchanger heats the water, the first outlet water temperature is the temperature detected by the high temperature sensor 7 at the outlet of the heat exchanger, and a third difference between the first outlet water temperature and the target heating temperature can be calculated.
S211, adjusting the opening of the gas valve of the gas water heater according to the third difference value and the change rate, so that the opening of the gas valve is reduced from a preset opening to a target opening, wherein the target opening is the opening corresponding to the required heat load, and the preset opening is larger than the target opening.
For example, after the bypass water proportional valve is controlled to be opened at the target flow rate, the gas valve may be controlled to output the required heat load Q1 at the opening G, and the opening G may be amplified by a certain multiple K, so that the gas water heater heats the cold water with the preset heat load higher than the required heat load, in this process, the first outlet water temperature of the heat exchanger and the change rate of the first outlet water temperature are obtained, and after the difference between the first outlet water temperature and the target heating temperature is calculated, the multiple K is reduced by the difference and the change rate, so that the finally output heat load is equal to the required heat load Q1.
In one example, the larger the difference value is, the smaller the change rate is, the slower the multiple K is reduced, so that the gas water heater heats cold water with higher heat load, and the cold water is heated to the target heating temperature quickly, otherwise, the smaller the difference value is, the larger the change rate is, the faster the multiple K is reduced, namely the reduction speed of the multiple K is inversely related to the difference value, and the positive correlation is carried out on the change rate, so that the cold water is heated quickly, the accident that a user is scalded due to the fact that the temperature is raised too quickly is avoided, and the cold water can be heated steadily.
In the initial heating stage, the opening of the gas valve of the gas water heater is adjusted according to the difference value and the change rate, so that the opening of the gas valve is reduced from a preset opening to a target opening, the target opening is the opening corresponding to the required heat load, the preset opening is larger than the target opening, namely the gas water heater heats cold water in the straight pipe with higher heat load in the initial heating stage, the temperature of water in the straight pipe is quickly increased to the target heating temperature, and the gas water heater can timely output hot water with the temperature required by a user.
In another alternative embodiment, when the thermal load output by the gas valve is equal to the required thermal load, for example, the multiple k=1, the temperature of the hot water output by the heat exchanger is close to the target heating temperature, at this time, the second outlet water temperature of the gas water heater may be obtained, a fourth difference between the second outlet water temperature and the set temperature is calculated, and the opening of the gas valve is adjusted according to the fourth difference, so that the second outlet water temperature is equal to the set temperature.
Specifically, as shown in fig. 2, the second outlet water temperature T3 of the gas water heater can be acquired in real time through the outlet water temperature sensor 9, the difference between the second outlet water temperature T3 and the set temperature T0 is calculated, and the opening of the gas valve is adjusted according to the difference, so that after the water heater rapidly heats cold water through high heat load, the opening of the gas valve is adjusted through the second outlet water temperature and the set temperature, the outlet water temperature at the final temperature adjustment stage is equal to the set temperature, and the accurate control of the outlet water temperature is realized.
Example III
Fig. 5 is a schematic structural diagram of a control device for a gas water heater according to a third embodiment of the present invention. As shown in fig. 5, a bypass pipe is arranged between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a bypass water proportional valve, the bypass water proportional valve is used for adjusting water flow of the bypass pipe, and the gas water heater control device specifically comprises:
The required heat load calculation module 501 is configured to obtain a required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and a set temperature set by a user;
the target heating temperature determining module 502 is configured to determine a target heating temperature according to the required heat load, the inlet water temperature, and the set temperature, where the target heating temperature is an expected outlet water temperature of a heat exchanger of the gas water heater and is greater than or equal to a dew point temperature corresponding to the required heat load;
a target flow determining module 503, configured to obtain a target flow of the bypass water proportional valve according to the total water inlet flow, the water inlet temperature, the target heating temperature, and the set temperature, where the target flow is a split flow of the total water inlet flow;
and a bypass water proportional valve adjusting module 504 for adjusting the opening of the bypass water proportional valve according to the target flow rate.
Optionally, a confirmation correspondence relationship between the required heat load, the water inlet temperature, the set temperature, and the target heating temperature is preset, where the confirmation correspondence relationship is: each required heat load corresponds to a plurality of first temperature ranges and a plurality of second temperature ranges, and the first temperature ranges and the second temperature ranges correspond to a temperature to be confirmed;
The target heating temperature determination module 502 includes:
a temperature range determining unit, configured to determine, in the determination correspondence, a first temperature range corresponding to the water inlet temperature and a second temperature range corresponding to the set temperature according to the required heat load;
and the first target heating temperature determining unit is used for taking the temperature to be confirmed corresponding to the corresponding first temperature range and the corresponding second temperature range as the target heating temperature.
Optionally, the target heating temperature determination module 502 further includes:
and a second target heating temperature determining unit, configured to determine that the target heating temperature is the set temperature and close the bypass water proportional valve if the set temperature is greater than a second temperature range with a highest temperature value in the determined correspondence according to the required heat load.
Optionally, the target heating temperature determination module 502 further includes:
and a third target heating temperature determining unit, configured to determine that the target heating temperature is the set temperature and close the bypass water proportional valve if the set temperature is less than or equal to the second temperature range with the highest temperature value but the inlet water temperature is greater than the first temperature range with the highest temperature value in the determined correspondence according to the required heat load.
Optionally, a main water proportional valve is arranged on a water inlet pipeline of the gas water heater, and the gas water heater further comprises:
the load judging module is used for judging whether the required heat load is larger than the rated heat load of the gas water heater or not;
the total water inflow adjusting module is used for adjusting the total water inflow according to the rated heat load, the set temperature and the water inflow temperature;
and the main water proportional valve adjusting module is used for controlling the opening degree of the main water proportional valve according to the adjusted total inflow water flow so as to enable the required heat load to reach the rated heat load.
Optionally, the target flow determining module 503 includes:
a first difference calculating unit, configured to calculate a difference between the target heating temperature and the set temperature to obtain a first difference;
a second difference calculating unit, configured to calculate a difference between the target heating temperature and the water inlet temperature to obtain a second difference;
a ratio calculating unit, configured to calculate a ratio of the first difference value to the second difference value;
and the target flow calculating unit is used for calculating the product of the ratio and the total water inflow to obtain the target flow of the bypass water proportional valve.
Optionally, the method further comprises:
The heat exchanger water outlet temperature and change rate acquisition module is used for acquiring a first water outlet temperature of the heat exchanger and the change rate of the first water outlet temperature;
the third difference module is used for calculating a third difference value between the first outlet water temperature and the target heating temperature;
the first gas valve adjusting module is used for adjusting the opening of the gas valve of the gas water heater according to the third difference value and the change rate, so that the opening of the gas valve is reduced from a preset opening to a target opening, the target opening is the opening corresponding to the required heat load, and the preset opening is larger than the target opening.
Optionally, the method further comprises:
the second water outlet temperature acquisition module is used for acquiring the second water outlet temperature of the gas water heater;
a fourth difference calculating module, configured to calculate a fourth difference between the second outlet water temperature and the set temperature;
and the second gas valve adjusting module is used for adjusting the opening degree of the gas valve according to the fourth difference value so that the second outlet water temperature is equal to the set temperature.
The gas water heater control device provided by the embodiment of the invention can execute the gas water heater control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
Fig. 2 and 6 show schematic structural diagrams of a gas water heater 60 that may be used to implement embodiments of the present invention. As shown in fig. 2, a bypass pipe is provided between the water outlet pipe and the water inlet pipe of the gas water heater, the bypass pipe is provided with a bypass water proportional valve 4, the bypass water proportional valve 4 is used for adjusting the water flow rate of the bypass pipe, as shown in fig. 6, the gas water heater 60 comprises at least one processor 61, and a memory, such as a Read Only Memory (ROM) 62, a Random Access Memory (RAM) 63, etc., which is communicatively connected with the at least one processor 61, wherein the memory stores a computer program executable by the at least one processor 61, and the processor 61 can perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 62 or the computer program loaded from the storage unit 68 into the Random Access Memory (RAM) 63. In the RAM 63, various programs and data required for the operation of the gas water heater 60 may also be stored. The processor 61, the ROM 62 and the RAM 63 are connected to each other via a bus 64. An input/output (I/O) interface 65 is also connected to bus 64.
Various components in the gas water heater 60 are connected to the I/O interface 65, including: a control panel 66, for example, a panel provided on the gas water heater 60 and including keys, a touch panel, and the like; a heat exchange unit 67 such as various gas heat exchangers and the like; a detection unit 68 such as a temperature sensor, a water flow sensor, etc.; and a communication unit 69 such as a network card, modem, wireless communication transceiver, etc. The communication unit 69 allows the gas water heater 60 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
In some embodiments, the gas water heater control method may be implemented as a computer program, in some embodiments part or all of which may be loaded and/or installed onto the gas water heater 60 via the ROM 62 and/or the communication unit 69. When the computer program is loaded into RAM 63 and executed by processor 61, one or more steps of the gas water heater control method described above may be performed. Alternatively, in other embodiments, the processor 61 may be configured to perform the gas water heater control method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor such that the computer programs, when executed by the processor, cause the functions/operations specified in the flowchart and/or block diagram to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A control method of a gas water heater, characterized in that a bypass pipe is arranged between a water outlet pipe and a water inlet pipe of the gas water heater, the bypass pipe is provided with a bypass water proportional valve, the bypass water proportional valve is used for adjusting water flow of the bypass pipe, the method comprises:
obtaining the required heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user;
determining a target heating temperature according to the required heat load, the water inlet temperature and the set temperature, wherein the target heating temperature is the expected water outlet temperature of a heat exchanger of the gas water heater and is greater than or equal to the dew point temperature corresponding to the required heat load;
obtaining the target flow of the bypass water proportional valve according to the total water inflow, the water inflow temperature, the target heating temperature and the set temperature, wherein the target flow is the split flow of the total water inflow;
and adjusting the opening degree of the bypass water proportional valve according to the target flow.
2. The gas water heater control method as set forth in claim 1, wherein a confirmation correspondence relationship of the required heat load-the intake water temperature-the set temperature-the target heating temperature is preset, the confirmation correspondence relationship being: each required heat load corresponds to a plurality of first temperature ranges and a plurality of second temperature ranges, and the first temperature ranges and the second temperature ranges correspond to a temperature to be confirmed;
Determining a target heating temperature according to the required heat load, the inlet water temperature and the set temperature, including:
according to the required heat load, in the corresponding relation of the confirmation, confirming a first temperature range corresponding to the water inlet temperature and a second temperature range corresponding to the set temperature;
and taking the temperature to be confirmed corresponding to the corresponding first temperature range and the corresponding second temperature range as the target heating temperature.
3. The gas water heater control method as set forth in claim 2, wherein before obtaining the target flow rate of the bypass water proportional valve based on the total inlet water flow rate, the inlet water temperature, the target heating temperature, and the set temperature, comprising:
and in the corresponding relation of the confirmation according to the required heat load, if the set temperature is larger than a second temperature range with the highest temperature value, confirming that the target heating temperature is the set temperature, and closing the bypass water proportional valve.
4. The gas water heater control method as set forth in claim 2, wherein before obtaining the target flow rate of the bypass water proportional valve based on the total inflow water flow rate, the inflow water temperature, the target heating temperature, and the set temperature, comprising:
And in the corresponding relation of the confirmation according to the required heat load, if the set temperature is smaller than or equal to the second temperature range with the highest temperature value, but the water inlet temperature is larger than the first temperature range with the highest temperature value, confirming that the target heating temperature is the set temperature, and closing the bypass water proportional valve.
5. The gas water heater control method as set forth in claim 1, wherein a main water proportional valve is provided on a water intake pipe of the gas water heater, and before determining a target heating temperature according to the required heat load, the water intake temperature, and the set temperature, further comprising:
judging whether the required heat load is larger than the rated heat load of the gas water heater or not;
if yes, adjusting the total water inflow according to the rated heat load, the set temperature and the water inflow temperature;
and controlling the opening degree of the main water proportional valve according to the regulated total inflow water flow so as to enable the required heat load to reach the rated heat load.
6. The water heater control method as recited in any one of claims 1-5, wherein obtaining the target flow rate of the bypass water proportional valve based on the total inlet water flow rate, the inlet water temperature, the target heating temperature, and the set temperature, comprises:
Calculating the difference between the target heating temperature and the set temperature to obtain a first difference;
calculating the difference between the target heating temperature and the water inlet temperature to obtain a second difference;
calculating a ratio of the first difference to the second difference;
and calculating the product of the ratio and the total inflow to obtain the target flow of the bypass water proportional valve.
7. The gas water heater control method according to any one of claims 1 to 5, further comprising, after adjusting the opening degree of the bypass water proportional valve according to the target flow rate:
acquiring a first water outlet temperature of the heat exchanger and a change rate of the first water outlet temperature;
calculating a third difference between the first outlet water temperature and the target heating temperature;
and adjusting the opening of the gas valve of the gas water heater according to the third difference value and the change rate, so that the opening of the gas valve is reduced from a preset opening to a target opening, wherein the target opening is the opening corresponding to the required heat load, and the preset opening is larger than the target opening.
8. The gas water heater control method as recited in claim 7, further comprising:
acquiring a second outlet water temperature of the gas water heater;
Calculating a fourth difference value between the second outlet water temperature and the set temperature;
and adjusting the opening of the gas valve according to the fourth difference value so that the second outlet water temperature is equal to the set temperature.
9. The utility model provides a gas heater controlling means, its characterized in that is provided with the bypass pipe between gas heater's outlet pipe and the inlet tube, the bypass pipe is provided with bypass water proportional valve, bypass water proportional valve is used for adjusting the discharge of bypass pipe, includes:
the demand heat load calculation module is used for obtaining the demand heat load of the gas water heater according to the obtained total water inflow and water inflow temperature of the gas water heater and the set temperature set by a user;
the target heating temperature determining module is used for determining a target heating temperature according to the required heat load, the water inlet temperature and the set temperature, wherein the target heating temperature is the expected water outlet temperature of the heat exchanger of the gas water heater and is greater than or equal to the dew point temperature corresponding to the required heat load;
the target flow determining module is used for obtaining the target flow of the bypass water proportional valve according to the total water inflow, the water inflow temperature, the target heating temperature and the set temperature, wherein the target flow is the split flow of the total water inflow;
And the bypass water proportional valve adjusting module is used for adjusting the opening degree of the bypass water proportional valve according to the target flow.
10. The utility model provides a gas heater, its characterized in that is provided with the bypass pipe between gas heater's outlet pipe and the inlet tube, the bypass pipe is provided with bypass water proportional valve, bypass water proportional valve is used for adjusting the discharge of bypass pipe, gas heater includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the gas water heater control method of any one of claims 1-8.
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| CN202210772479.5A CN116336674A (en) | 2022-06-30 | 2022-06-30 | Control method and device of gas water heater and gas water heater |
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| CN202210772479.5A CN116336674A (en) | 2022-06-30 | 2022-06-30 | Control method and device of gas water heater and gas water heater |
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