CN112113345B - Method for judging completion of preheating cycle of gas water heater - Google Patents

Method for judging completion of preheating cycle of gas water heater Download PDF

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CN112113345B
CN112113345B CN202010941181.3A CN202010941181A CN112113345B CN 112113345 B CN112113345 B CN 112113345B CN 202010941181 A CN202010941181 A CN 202010941181A CN 112113345 B CN112113345 B CN 112113345B
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preheating
temperature
temperature threshold
water heater
gas water
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CN112113345A (en
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张俊新
郑来松
谢志辉
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

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Abstract

The invention belongs to the technical field of gas water heaters, and particularly relates to a method for judging completion of preheating circulation of a gas water heater. The method comprises the following steps: starting gas water heaterPreheating mode of the device, setting preheating temperature T within the range of preheating temperature thresholdPreheating(ii) a Real-time acquisition of water inlet temperature T of gas water heaterInflow water(ii) a When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water inlet temperature T is in the low temperature zoneInflow waterReaches a first temperature threshold T1，T1≤TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat and circulate; when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the preheating temperature threshold range, if the water inlet temperature T is higher than the preheating temperature threshold valueInflow waterReaching a second temperature threshold T2，T2＜TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat the circulation. The invention effectively solves the problem that the water consumption point temperature is easy to be higher when the preheating circulation of the existing gas water heater is completed.

Description

Method for judging completion of preheating cycle of gas water heater
Technical Field
The invention belongs to the technical field of gas water heaters, and particularly relates to a method for judging completion of preheating circulation of a gas water heater.
Background
For a household with a relatively long circulation pipeline in the home, for example, the circulation pipeline is more than 10m, a gas water heater with a preheating function is usually installed to reduce the amount of cold water flowing out from a water outlet point and increase the user experience. However, the gas water heater with preheating function in the current market is also a zero-cold-water gas water heater, and when judging whether the preheating cycle is finished, the judgment standard is as follows: the temperature of the inlet water reaches the preset temperature. The water consumption point is easy to be heated due to the judgment mode, so that the user is scalded, and the experience of the user is reduced.
Disclosure of Invention
The invention provides a method for judging the completeness of a preheating cycle of a gas water heater, aiming at solving the problem that the temperature of a water consumption point is high easily caused when the preheating cycle of the existing gas water heater is completed.
The invention is realized by adopting the following technical scheme: a method for judging the completion of a preheating cycle of a gas water heater comprises the following steps:
starting the preheating mode of the gas water heater, and setting the preheating temperature T within the range of the preheating temperature threshold valuePreheating；
Real-time acquisition of water inlet temperature T of gas water heaterInflow water；
When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water inlet temperature T is in the low temperature zoneInflow waterReaches a first temperature threshold T1，T1≤TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the preheating temperature threshold range, if the water inlet temperature T is higher than the preheating temperature threshold valueInflow waterReaching a second temperature threshold T2，T2＜TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat the circulation.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the first temperature threshold T1According to said preheating temperature TPreheatingObtaining the corresponding relation of the data; the second temperature threshold T2According to said preheating temperature TPreheatingThe corresponding relationship of (a) is obtained.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the first temperature threshold T1＝TPreheating-△T1，△T1A first limiting temperature threshold; the second temperature threshold T2＝TPreheating-△T2，△T2Is the second limiting temperature threshold.
The method for judging the completion of the preheating cycle of the gas water heater is further improved when the preheating temperature T is higher than the preset temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, the first temperature threshold T1Satisfies the following conditions: t is1＝k3×TPreheating+k4；
When preheating temperature TPreheatingIn the high temperature region within the preheat temperature threshold range,the second temperature threshold T2Also satisfies: t is2＝k3×TPreheating+k4；
Wherein k is3And k4Is a coefficient, and k3And k4Enabling the first temperature threshold T1＝TPreheating-△T1And also enables the second temperature threshold T2＝TPreheating-△T2。
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the method further comprises the following steps:
real-time collection gas heater's play water temperature TDischarging water；
When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water outlet temperature T is in the low temperature zoneDischarging waterReaching a third temperature threshold T3，T3＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the range of the preheating temperature threshold value, if the water outlet temperature T is higher than the preheating temperature threshold valueDischarging waterReaching a fourth temperature threshold T4，T4＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat the circulation.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the third temperature threshold T3According to said preheating temperature TPreheatingObtaining the corresponding relation of the data; the fourth temperature threshold T4According to said preheating temperature TPreheatingThe corresponding relationship of (a) is obtained.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the third temperature threshold T3＝TPreheating+△T+△T3Said fourth temperature threshold T4＝TPreheating+△T+△T4Wherein, DeltaT is a reserved temperature-punching threshold value3A third limiting temperature threshold;△T4is a fourth limiting temperature threshold.
The method for judging the completion of the preheating cycle of the gas water heater is further improved when the preheating temperature T is higher than the preset temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, the third temperature threshold T3Satisfies the following conditions: t is3＝k1×TPreheating+k2；
When preheating temperature TPreheatingWhen the temperature is in the high temperature zone of the preheating temperature threshold range, the fourth temperature threshold T4Also satisfies: t is4＝k1×TPreheating+k2；
Wherein k is1And k2Is a coefficient, and k1And k2Enabling the third temperature threshold T3＝TPreheating+△T+△T3And the fourth temperature threshold T can be set4＝TPreheating+△T+△T4。
The judgment method for the completion of the preheating cycle of the gas water heater is further improved in that the preheating temperature threshold range is 30-60 ℃, the low-temperature region is 30-45 ℃, and the high-temperature region is 45-60 ℃.
The judgment method for the completion of the preheating cycle of the gas water heater is further improved in that the preheating temperature threshold range is 35-50 ℃, the low-temperature region is 35-45 ℃, and the high-temperature region is 45-50 ℃.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the first limit temperature threshold value Delta T1Is 0 ℃ to 5 ℃, and the second limiting temperature threshold value Delta T2Is 3-10 ℃.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the first limit temperature threshold value Delta T1At 2-5 deg.C, the second limiting temperature threshold value Delta T2Is 5-10 ℃.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the preheating cycle is completedThe retained temperature threshold value delta T is 5-10 ℃, and the third temperature limiting threshold value delta T3At 5-10 deg.C, the fourth limiting temperature threshold value Delta T4Is 0 ℃ to 5 ℃.
The method for judging the completion of the preheating cycle of the gas water heater is further improved in that the reserved temperature-flushing threshold value delta T is 8 ℃, and the third temperature-limiting threshold value delta T3Is 7-8 ℃, and the fourth limiting temperature threshold value delta T4Is 1 to 3 ℃. Compared with the prior art, the invention adopting the scheme has the beneficial effects that:
in the judging method of the invention, firstly, the preheating temperature T is set within the range of the preheating temperature threshold valuePreheating(ii) a Then, the water inlet temperature T of the gas water heater is acquired in real timeInflow water(ii) a Secondly, according to the preheating temperature TPreheatingJudging whether the temperature is in a high-temperature area or a low-temperature area; when preheating temperature TPreheatingWhen the water is in the low temperature zone, the inlet water temperature T is judgedInflow waterWhether or not the first temperature threshold T is reached1，T1≤TPreheating(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat and circulate; when preheating temperature TPreheatingWhen the water is in the high temperature zone, the inlet water temperature T is judgedInflow waterWhether or not the second temperature threshold T is reached2，T2＜TPreheating(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues preheating circulation, and the problem that the water consumption point temperature is high easily caused when the preheating circulation of the existing gas water heater is completed is effectively solved.
Drawings
FIG. 1 is a graph of the temperature of water in a circulation circuit at different distances from a water outlet, at different heating times, excluding the temperature at the end of preheating; wherein the abscissa is the distance from the water outlet, and the ordinate is the temperature of water at each position from the water outlet to the water inlet.
FIG. 2 is a graph of the temperature of water in the circulation line at different distances from the water outlet for different heating times, including the temperature at the end of preheating; wherein the abscissa is the distance from the water outlet, and the ordinate is the temperature of water at each position from the water outlet to the water inlet.
FIG. 3 is a flowchart illustrating a method for determining completion of a preheating cycle of a gas water heater according to an embodiment of the present invention;
FIG. 4 is another flowchart of a method for determining completion of a preheating cycle of a gas water heater according to an embodiment of the present invention;
FIG. 5 shows the preheating temperature T obtained by the method for determining the completion of the preheating cycle of the gas water heater according to the present inventionPreheatingAnd the temperature T of the inlet waterInflow waterThe relationship between them.
FIG. 6 shows the preheating temperature T obtained by the method for determining completion of the preheating cycle of the gas water heater according to the present inventionPreheatingAnd the temperature T of the outlet waterDischarging waterThe relationship between them.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 3, in order to solve the above problem, the present embodiment provides a control method for cyclic preheating of a water heater, which includes the following steps:
s1, starting the preheating mode of the gas water heater, and setting the preheating temperature T within the range of the preheating temperature threshold valuePreheating；
S2, collecting the water inlet temperature T of the gas water heater in real timeInflow water；
S3, preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water inlet temperature T is in the low temperature zoneInflow waterWhether or not the first temperature threshold T is reached1，T1≤TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the preheating temperature threshold range, if the water inlet temperature T is higher than the preheating temperature threshold valueInflow waterReaching a second temperature threshold T2，T2＜TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat the circulation.
S3 specifically includes the following steps, as shown in fig. 4:
s31, judging the preheating temperature TPreheatingWhether the temperature is in a low-temperature area within the range of the preheating temperature threshold value; if yes, go to S32; if not, go to S33;
s32, judging the inlet water temperature TInflow waterWhether or not the first temperature threshold T is reached1(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat and circulate;
s33, judging the inlet water temperature TInflow waterWhether or not the second temperature threshold T is reached2(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat the circulation.
When the gas water heater is in a preheating cycle, the optimal conditions are as follows: the water in the circulation line is heated to a target temperature, i.e. a preset temperature for use, in its entirety.
But the gas water heater has the limitations of the lowest heat load and the maximum circulating flow of the water pump, and the limitation of the heating time. Within a short time limit, it is difficult to heat the water in the circulation line to the target temperature in its entirety. Although the extended heating time can raise the temperature of the water in the circulation line, the extended heating time increases the amount of gas consumed, and the like.
The actual situation is that the temperature of the water in the circulating pipeline gradually decreases from the water outlet to the water inlet. With the lapse of time, the circulating water is continuously flowed and heated, and the whole temperature gradually rises. The water consumption point is usually between the water outlet and the water inlet, for example, the water outlet is 0m, the water inlet is 20m, and then the water consumption point is between 5m and 15 m.
As shown in fig. 1, fig. 1 is a temperature curve of water in the circulation pipeline at different distances from the water outlet at different heating times, wherein the temperature curve at the end of preheating is not included. As can be seen from figure 1, on the premise of equal heating time, the temperature of the water in the circulating pipeline far away from the water outlet (0m) is gradually reduced, and the temperature of the water at the water inlet (20m) is the minimum. At the position with the constant distance from the water outlet (0m), the temperature of the water at the position is gradually increased along with the extension of the heating time, but the temperature increase of the water at the water inlet (20m) is smaller in amplitude.
As shown in fig. 2, fig. 2 is a temperature curve of water in the circulation pipeline at different distances from the water outlet at different heating times, which includes a temperature curve at the end of preheating. As can be seen from FIG. 2, at the end of preheating, the water temperature at the water outlet is still higher than that at the water inlet, and the water temperature at the water outlet point (10m) is also higher than that at the water inlet.
From the above analysis, the current condition that the inlet water temperature is equal to the preheating temperature to judge whether the preheating cycle is finished has the following problems: when the temperature of the inlet water is equal to the preheating temperature, namely the water temperature of the water inlet is equal to the preheating temperature, the water temperature of the water outlet point is necessarily higher than the preset temperature. If the preheating temperature is still relatively high at this moment, for example, as high as 46 ℃ (high temperature is suitable for a user to soak feet), the temperature of the water outlet point is inevitably higher than 46 ℃, so that the risk of scalding the user exists, and the problems of waste of gas and time are solved.
In the present embodiment, to solve the above problem, first, the preheating temperature T is set within the preheating temperature threshold rangePreheating(ii) a Then, the water inlet temperature T of the gas water heater is acquired in real timeInflow water(ii) a Secondly, according to the preheating temperature TPreheatingJudging whether the temperature is in a high-temperature area or a low-temperature area; when preheating temperature TPreheatingWhen the water is in the low temperature zone, the inlet water temperature T is judgedInflow waterWhether or not the first temperature threshold T is reached1，T1≤TPreheating(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat and circulate; when the preheating temperature is higherTPreheatingWhen the water is in the high temperature zone, the inlet water temperature T is judgedInflow waterWhether or not the second temperature threshold T is reached2，T2＜TPreheating(ii) a If so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat the circulation.
In the judging method of this embodiment, when the preheating temperature T is reachedPreheatingIn the low temperature region within the preheating temperature threshold range, because of the preheating temperature TPreheatingIs inherently low, so that even if the temperature T of the inlet water is lowInflow waterTo a preheating temperature TPreheatingThe risk that the user is scalded by the water temperature of the water consumption point can be reduced, so that the gas water heater exits the preheating mode, and the problem that the water consumption point temperature is high easily caused when the preheating cycle of the conventional gas water heater is completed is effectively solved; but also because of T1≤TPreheatingTherefore, the preheating cycle time is also reduced, and the consumption of fuel gas is saved.
When preheating temperature TPreheatingWhen the temperature is in the high temperature zone of the preheating temperature threshold range, the preheating temperature T is usedPreheatingIs itself high, so if it is still at the inlet water temperature TInflow waterTo a preheating temperature TPreheatingIf the condition that the gas water heater exits the preheating mode is judged, the water temperature of a water using point is high, and the risk of scalding a user exists. So in this embodiment, when T isPreheatingWhen the water is in the high-temperature zone within the preheating temperature threshold range, the water inlet temperature is TInflow waterReaching a second temperature threshold T2，T2＜TPreheating(ii) a To determine whether to exit the preheat mode condition, the inlet water temperature T is thus ensuredInflow waterAt the time of reaching TPreheatingJust withdraw from preheating mode before, reduced the temperature of water consumption point, and then reduced the risk of scalding the user, the quantity of gas has been saved to the time of the preheating cycle of saving.
Wherein the preheating temperature threshold range is 30-60 ℃, the low temperature region is 30-45 ℃, and the high temperature region is 45-60 ℃. Preferably, the preheating temperature threshold range is 35-50 ℃, the low temperature region is 35-45 ℃, and the high temperature region is 45-50 ℃.
Go toOf a first temperature threshold T1According to and preheating temperature TPreheatingObtaining the corresponding relation of the data; second temperature threshold T2According to and preheating temperature TPreheatingThe corresponding relationship of (a) is obtained.
Preferably, the first temperature threshold T1＝TPreheating-△T1，△T1A first limiting temperature threshold; second temperature threshold T2＝TPreheating-△T2，△T2Is the second limiting temperature threshold.
Wherein the first limiting temperature threshold DeltaT1Is 0 ℃ to 5 ℃, and the second limiting temperature threshold value Delta T2Is 3-10 ℃. Preferably, the first limiting temperature threshold Δ T1At 2-5 deg.C, the second limiting temperature threshold value Delta T2Is 5-10 ℃.
If the preheating temperature TPreheatingIn a low-temperature zone within a preheating temperature threshold and in a high-temperature section of the low-temperature zone, e.g. TPreheating44 ℃, then Δ T1Larger temperature values of 0 ℃ to 5 ℃ can be selected, e.g. Δ T1May be 4 deg.C, in which case the first temperature threshold T may be1The temperature is 40 ℃, so that the temperature of the water using point is effectively avoided from being too high, and the water temperature of the water using point can reach the comfortable bathing temperature of a user as far as possible.
If the preheating temperature TPreheatingIn a low-temperature zone within a preheating temperature threshold range, and in a low-temperature section of the low-temperature zone, e.g. T Preheating35 deg.C, then. DELTA.T1Selecting a smaller temperature value of 0 ℃ to 5 ℃, e.g. Δ T1May be 1 deg.C, at which time the first temperature threshold T is134 ℃, which not only can avoid the temperature of the water using point from being too high, but also can effectively avoid the temperature of the water using point from being too low, so that the first temperature threshold value T is1As close as possible to the preheating temperature TPreheating。
If the preheating temperature TPreheatingIn a high-temperature zone within a preheating temperature threshold and in a high-temperature section of the high-temperature zone, e.g. T Preheating55 deg.C, then. DELTA.T2Selecting larger temperature values of 3-10 deg.C, e.g. DeltaT2May be 10 deg.C, thisTime of second temperature threshold value T2The temperature is 45 ℃, so that the overhigh temperature of the water using point is effectively avoided, and the water temperature of the water using point can reach the comfortable bathing temperature of a user as far as possible.
If the preheating temperature TPreheatingIn a high-temperature zone within a preheating temperature threshold and in a low-temperature section of the high-temperature zone, e.g. TPreheating46 ℃, then Δ T2Selecting a smaller temperature value of 3-10 deg.C, e.g. Δ T2May be 3 deg.C, at which time the second temperature threshold T is243 ℃, which not only can avoid the temperature of the water using point from being too high, but also can effectively avoid the temperature of the water using point from being too low, so that the second temperature threshold value T is enabled2As close as possible to the preheating temperature TPreheating。
Further, when the preheating temperature T is higherPreheatingIn the low temperature zone within the preheating temperature threshold range, the first temperature threshold T1Satisfies the following conditions: t is1＝k3×TPreheating+k4；
When preheating temperature TPreheatingIn the high temperature zone within the preheating temperature threshold range, the second temperature threshold T2Also satisfies: t is2＝k3×TPreheating+k4；
Wherein k is3And k4Is a coefficient, and k3And k4Enabling the first temperature threshold T1＝TPreheating-△T1And also enables the second temperature threshold T2＝TPreheating-△T2。
As shown in fig. 5, at a preheating temperature TPreheatingAs abscissa, taking the temperature T of the inlet waterInflow waterTwo points are respectively selected in a low-temperature area (35-45 ℃) within a preheating temperature threshold range as an ordinate to obtain a preheating temperature TPreheatingAnd the temperature T of the inlet waterInflow waterThe variation curve of (d); simultaneously, two points are selected as the preheating temperature T in a high-temperature area (45-55 ℃) within the range of the preheating temperature threshold valuePreheatingAnd the temperature T of the inlet waterInflow waterFinally obtaining a broken line as shown in fig. 5, and obtaining a unary linear function curve after uniformly linearizing the two curves, wherein T isInflow water＝k3×TPreheating+k4，k3And k4The coefficients are different, different gas water heaters have different coefficients, and the coefficients need to be determined according to actual conditions. For example, taking this embodiment as an example, TInflow water＝0.7×TPreheating+10.75. In the process of the judging method of the embodiment, the inlet water temperature T is judgedInflow waterWhether or not it reaches 0.7 XTPreheatingThe +10.75 can determine whether to exit the preheating mode, thereby not only reducing the difficulty of programming, but also reducing the occupied space; and the judgment method is simplified.
Further, the judging method further includes:
real-time collection gas heater's play water temperature TDischarging water；
When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water outlet temperature T is in the low temperature zoneDischarging waterWhether or not the third temperature threshold T is reached3，T3＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the range of the preheating temperature threshold value, if the water outlet temperature T is higher than the preheating temperature threshold valueDischarging waterReaching a fourth temperature threshold T4，T4＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat the circulation.
Therefore, the problem that due to the change of external factors such as weather and air sources, the heating transition of the outlet water temperature is caused can be avoided, the temperature of the outlet water point is higher than the expected temperature, and when the problem occurs, protection is timely made, and the preheating circulation is cancelled.
Further, a third temperature threshold T3According to and preheating temperature TPreheatingObtaining the corresponding relation of the data; fourth temperature threshold T4According to and preheating temperature TPreheatingThe corresponding relationship of (a) is obtained.
Wherein the third temperature threshold T3＝TPreheating+△T+△T3Fourth temperature threshold T4＝TPreheating+△T+△T4Wherein, DeltaT is a reserved temperature-punching threshold value3A third limiting temperature threshold; delta T4Is a fourth limiting temperature threshold.
Because the outlet water temperature has an instant specific preheating temperature T at the instant of heatingPreheatingHigh, in order to avoid erroneous determination, the third temperature threshold T in the present embodiment3＝TPreheating+△T+△T3Fourth temperature threshold T4＝TPreheating+△T+△T4. At the same time because of Delta T3、△T4The presence of (a) also enables the preheating cycle to be heated at a slightly higher temperature, which is beneficial to reducing the heating time and reducing the user waiting time.
If the preheating temperature TPreheatingThe low temperature zone within the range of the preheating temperature threshold value indicates that the water outlet temperature T is the sameDischarging waterTo reach T3＝TPreheating+△T+△T3The risk of scalding the user due to the water temperature of the water spot is also small. However, if the preheating temperature T is setPreheatingThe high temperature zone within the range of the preheating temperature threshold value avoids the risk of scalding users due to water consumption points, so the water outlet temperature TDischarging waterReaching a fourth temperature threshold T4＝TPreheating+△T+△T4And the gas water heater timely exits the preheating mode.
Wherein the reserved temperature-punching threshold value delta T is 5-10 ℃, and the third temperature-limiting threshold value delta T3Is 5-10 ℃, and a fourth limiting temperature threshold value Delta T4Is 0 ℃ to 5 ℃. Preferably, the reserved temperature-impacting threshold value delta T is 8 ℃, and the third temperature-limiting threshold value delta T3Is 7-8 ℃, and the fourth limiting temperature threshold value delta T4Is 1 to 3 ℃.
If the preheating temperature TPreheatingIn a low-temperature zone within a preheating temperature threshold range and in a high-temperature section of the low-temperature zone, e.g. TPreheating44 ℃, then Δ T3The smaller temperature value of 5 ℃ to 10 ℃, for example Δ T, can be selected3May be 5 deg.C, in which case the third temperature threshold T may be3At 49 ℃, the temperature of the water using point is effectively avoided from being too high, and the preheating time is shortened as much as possible.
If the preheating temperature TPreheatingIn a low-temperature region of the preheating temperature threshold range and in a low-temperature section of the low-temperature region, e.g. T Preheating35 deg.C, then. DELTA.T3Larger temperature values of 5 ℃ to 10 ℃, for example Δ T, can be selected3May be 8 deg.C, in which case the third temperature threshold T may be3The temperature is 43 ℃, so that the temperature of the water using point is effectively prevented from being too high, the problem of too low temperature of the water using point can be avoided, and the preheating time is shortened as much as possible.
If the preheating temperature TPreheatingIn a high-temperature zone within a preheating temperature threshold and in a high-temperature section of the high-temperature zone, e.g. T Preheating55 deg.C, then. DELTA.T4The smaller temperature value of 0 ℃ to 5 ℃, for example Δ T, can be selected4May be 0 deg.C, at which time the third temperature threshold T is4Is 55 ℃, which effectively avoids the overhigh temperature of the water using point and shortens the preheating time as much as possible.
If the preheating temperature TPreheatingIn a low-high temperature region in the range of the preheating temperature threshold and in a low-temperature section of the high-temperature region, e.g. TPreheating46 ℃, then Δ T4Larger temperature values of 0 ℃ to 5 ℃ can be selected, e.g. Δ T4May be 5 deg.C, in which case the third temperature threshold T may be4The temperature is 51 ℃, so that the temperature of the water using point is effectively prevented from being too high, the problem of too low temperature of the water using point can be avoided, and the preheating time is shortened as much as possible.
Further, when the preheating temperature T is higherPreheatingIn the low temperature zone within the preheating temperature threshold range, the third temperature threshold T3Satisfies the following conditions: t is3＝k1×TPreheating+k2；
When preheating temperature TPreheatingWhen the temperature is in the high temperature zone of the preheating temperature threshold range, the fourth temperature threshold T4Also satisfies: t is4＝k1×TPreheating+k2；
Wherein k is1And k2Is a coefficient, and k1And k2Enabling the third temperature threshold T3＝TPreheating+△T+△T3And can make the instituteThe fourth temperature threshold T4＝TPreheating+△T+△T4。
As shown in fig. 6, at a preheating temperature TPreheatingAs the abscissa, the water outlet temperature T is takenDischarging waterTwo points are arbitrarily selected as the ordinate, and the preheating temperature T is setPreheatingAnd the temperature T of the outlet waterDischarging waterThe variation curve of (a) is obtained as a one-dimensional linear function curve shown in fig. 6, wherein the leaving water temperature TDischarging water＝k1×TPreheating+k2Wherein k is1、k2The coefficients are different, different gas water heaters have different coefficients, and the coefficients need to be determined according to actual conditions. For example, taking this embodiment as an example, the preheating temperatures T are selected from (35,45) and (55, 60)PreheatingAnd the temperature T of the outlet waterDischarging waterAs shown in fig. 5, a first order function of a unit is calculated: t isDischarging water＝0.75×TPreheating+18.75. In the process of the judging method of the embodiment, the outlet water temperature T is judgedDischarging waterWhether or not it reaches 0.75 XTPreheating+18.75 can determine whether to exit the preheating mode, so that the difficulty of programming is reduced, and the occupied space is reduced; and the judgment method is simplified.
For example, the outlet water temperature T is judgedDischarging waterWhether or not it reaches 0.75 XTPreheating+18.75, if the temperature reaches the preset temperature, stopping preheating the gas water heater and exiting the preheating mode; if not, the gas water heater continues to preheat circulation.
The preheating temperature threshold range is 35-50 ℃, and the low-temperature region is 35-45 ℃; first limiting temperature threshold Δ T1Is 2 to 5 ℃; the reserved temperature-punching threshold value delta T is 8 ℃; third limiting temperature threshold Δ T3Taking 7 ℃ to 8 ℃ as an example, the preheating temperature T is specifiedPreheatingIn the low-temperature area, the judgment method for completing the preheating cycle of the gas water heater comprises the following steps:
s1, starting the preheating mode of the gas water heater, and setting the preheating temperature T in the range of 35-45 ℃ in the low-temperature areaPreheating；
S2, collecting the water inlet temperature T of the gas water heater in real timeInflow waterAnd the temperature T of the outlet waterDischarging water；
S3, judging the water outlet temperature TDischarging waterWhether or not the third temperature threshold T is reached3，T3＝TPreheating+△T+△T3＝TPreheating+8℃+(7℃～8℃)；
If so, stopping preheating the gas water heater and exiting the preheating mode;
if not, judging the inlet water temperature TInflow waterWhether or not the first temperature threshold T is reached1，T1＝TPreheating-△T1＝TPreheating- (2 ℃ to 5 ℃); if so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat the circulation.
The preheating temperature threshold range is 35-50 ℃, and the high temperature area is 45-50 ℃; second limiting temperature threshold DeltaT2Is 5 to 10 ℃; the reserved temperature-punching threshold value delta T is 8 ℃; fourth limiting temperature threshold Δ T41 ℃ to 3 ℃ as an example, the preheating temperature T is specifiedPreheatingIn the high-temperature area, the judgment method for completing the preheating cycle of the gas water heater comprises the following steps:
s1, starting the preheating mode of the gas water heater, and setting the preheating temperature T within the range of 45-50 DEG CPreheating；
S2, collecting the water inlet temperature T of the gas water heater in real timeInflow waterAnd the temperature T of the outlet waterDischarging water；
S3, judging the water outlet temperature TDischarging waterWhether or not the fourth temperature threshold T is reached4，T4＝TPreheating+△T+△T4＝TPreheating+8℃+(1℃～3℃)；
If so, stopping preheating the gas water heater and exiting the preheating mode;
if not, judging the inlet water temperature TInflow waterWhether or not the second temperature threshold T is reached2，T2＝TPreheating-△T2＝TPreheating- (5 ℃ to 10 ℃); if so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat the circulation.
If the difficulty of programming is reduced and the occupied space is reduced, the determining method of this embodiment may further include:
s1, starting a preheating mode of the gas water heater; setting the preheating temperature T within the range of the preheating temperature threshold valuePreheating；
S2, collecting the water inlet temperature T of the gas water heater in real timeInflow waterAnd the temperature T of the outlet waterDischarging water；
S3, judging the water outlet temperature TDischarging waterWhether or not k is reached1×TPreheating+k2(e.g., 0.75 XT)Preheating+18.75)；
If so, stopping preheating the gas water heater and exiting the preheating mode;
if not, judging the inlet water temperature TInflow waterWhether or not k is reached3×TPreheating+k4(e.g., 0.7 XT)Preheating+ 10.75); if so, the gas water heater exits the preheating mode; if not, the gas water heater continues to preheat the circulation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. A method for judging the completion of a preheating cycle of a gas water heater is characterized by comprising the following steps:
starting the preheating mode of the gas water heater, and setting the preheating temperature T within the range of the preheating temperature threshold valuePreheating；
Real-time acquisition of water inlet temperature T of gas water heaterInflow water；
When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water inlet temperature T is in the low temperature zoneInflow waterReaches a first temperature threshold T1，T1≤TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the preheating temperature threshold range, if the water inlet temperature T is higher than the preheating temperature threshold valueInflow waterReaching a second temperature threshold T2，T2＜TPreheating(ii) a The gas water heater exits the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
the first temperature threshold T1According to said preheating temperature TPreheatingThe corresponding relationship of (a) is obtained, specifically: the first temperature threshold T1＝TPreheating-△T1，△T1A first limiting temperature threshold; the second temperature threshold T2According to said preheating temperature TPreheatingThe corresponding relationship of (a) is obtained, specifically: the second temperature threshold T2＝TPreheating-△T2，△T2Is the second limiting temperature threshold.
2. The method as claimed in claim 1, wherein the preheating temperature T is the preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, the first temperature threshold T1Satisfies the following conditions: t is1＝k3×TPreheating+k4；
When preheating temperature TPreheatingWhen the temperature is in the high temperature zone of the preheating temperature threshold range, the second temperature threshold T2Also satisfies: t is2＝k3×TPreheating+k4；
Wherein k is3And k4Is a coefficient, and k3And k4Enabling the first temperature threshold T1＝TPreheating-△T1And also enables the second temperature threshold T2＝TPreheating-△T2。
3. The method of claim 1, further comprising:
real-time collection gas heater's play water temperature TDischarging water；
When preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, if the water outlet temperature T is in the low temperature zoneDischarging waterReaching a third temperature threshold T3，T3＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat and circulate;
when preheating temperature TPreheatingWhen the water is in the high-temperature zone within the range of the preheating temperature threshold value, if the water outlet temperature T is higher than the preheating temperature threshold valueDischarging waterReaching a fourth temperature threshold T4，T4＞TPreheating(ii) a Stopping preheating the gas water heater and exiting the preheating mode; otherwise, the gas water heater continues to preheat the circulation.
4. Method for judging the completion of a preheating cycle of a gas water heater according to claim 3, wherein said third temperature threshold T3According to said preheating temperature TPreheatingObtaining the corresponding relation of the data; the fourth temperature threshold T4According to said preheating temperature TPreheatingThe corresponding relationship of (a) is obtained.
5. Method for judging the completion of a preheating cycle of a gas water heater according to claim 4, wherein said third temperature threshold T3＝TPreheating+△T+△T3Said fourth temperature threshold T4＝TPreheating+△T+△T4Wherein, DeltaT is a reserved temperature-punching threshold value3A third limiting temperature threshold; delta T4Is a fourth limiting temperature threshold.
6. The method as claimed in claim 5, wherein the preheating temperature T is the preheating temperature TPreheatingWhen the temperature is in the low temperature zone of the preheating temperature threshold range, the third temperature threshold T3Satisfies the following conditions: t is3＝k1×TPreheating+k2；
When preheating temperature TPreheatingWhen the temperature is in the high temperature zone of the preheating temperature threshold range, the fourth temperature threshold T4Also satisfies: t is4＝k1×TPreheating+k2；
Wherein k is1And k2Is a coefficient, and k1And k2Enabling the third temperature threshold T3＝TPreheating+△T+△T3And the fourth temperature threshold T can be set4＝TPreheating+△T+△T4。
7. The method for judging completion of the preheating cycle of a gas water heater according to any one of claims 1 to 6, wherein the preheating temperature threshold ranges from 30 ℃ to 60 ℃, the low temperature region ranges from 30 ℃ to 45 ℃, and the high temperature region ranges from 45 ℃ to 60 ℃.
8. The method for judging completion of the preheating cycle of a gas water heater as claimed in claim 7, wherein the preheating temperature threshold ranges from 35 ℃ to 50 ℃, the low temperature region ranges from 35 ℃ to 45 ℃, and the high temperature region ranges from 45 ℃ to 50 ℃.
9. Method for judging the completion of a preheating cycle of a gas water heater according to claim 1, characterized in that said first limiting temperature threshold Δ Τ1Is 0 ℃ to 5 ℃, and the second limiting temperature threshold value Delta T2Is 3-10 ℃.
10. Method for judging the completion of a preheating cycle of a gas water heater according to claim 9, characterized in that said first limiting temperature threshold Δ Τ1At 2-5 deg.C, the second limiting temperature threshold value Delta T2Is 5-10 ℃.
11. The method for determining completion of a preheating cycle of a gas water heater as claimed in claim 5, wherein said predetermined temperature-flushing threshold Δ T is 5-10 ℃ and said third temperature-limiting threshold Δ T is3At 5-10 deg.C, the fourth limiting temperature threshold value Delta T4Is 0 ℃ to 5 ℃.
12. The method of claim 11The method for judging completion of the preheating cycle of the gas water heater is characterized in that the reserved temperature-flushing threshold value delta T is 8 ℃, and the third temperature-limiting threshold value delta T3Is 7-8 ℃, and the fourth limiting temperature threshold value delta T4Is 1 to 3 ℃.
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Publication number Priority date Publication date Assignee Title
AU2003202621A1 (en) * 2002-03-13 2003-09-22 Dux Manufacturing Limited A water heater and a method of heating water in a tank
CN111174444A (en) * 2020-02-25 2020-05-19 华帝股份有限公司 Control method for intelligent preheating of zero-cold-water heater
CN111351227A (en) * 2020-02-13 2020-06-30 青岛经济技术开发区海尔热水器有限公司 Water heater control method with zero cold water circulation function and water heater

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003202621A1 (en) * 2002-03-13 2003-09-22 Dux Manufacturing Limited A water heater and a method of heating water in a tank
CN111351227A (en) * 2020-02-13 2020-06-30 青岛经济技术开发区海尔热水器有限公司 Water heater control method with zero cold water circulation function and water heater
CN111174444A (en) * 2020-02-25 2020-05-19 华帝股份有限公司 Control method for intelligent preheating of zero-cold-water heater

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