CN113983694B - Control method for minimum load matching start flow of gas water heater - Google Patents
Control method for minimum load matching start flow of gas water heater Download PDFInfo
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- CN113983694B CN113983694B CN202111412906.0A CN202111412906A CN113983694B CN 113983694 B CN113983694 B CN 113983694B CN 202111412906 A CN202111412906 A CN 202111412906A CN 113983694 B CN113983694 B CN 113983694B
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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
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- 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
Abstract
The invention provides a control method for minimum load matching start flow of a gas water heater. The method comprises the following steps of according to a set temperature T Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 Comparing; if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 Comparing; if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 Heating; if T Effluent water <＝T Setting up Hold P Real world Heating is continued without change. The method intelligently judges whether the minimum load is the minimum firepower value of the machine design. The water flow signal, the water inlet temperature and the minimum load are collected, analyzed and judged, so that the normal hot water can be used for quickly starting ignition, the water heater can be prevented from being started by mistake due to the fact that cold water is switched on and off, and meanwhile, the water heater is started under low water pressure.
Description
Technical Field
The invention relates to the field of kitchen appliances, in particular to a control method for minimum load matching start flow of a gas water heater.
Background
The working principle of the gas water heater is as follows: when a user uses water, a water flow sensor in the gas water heater detects a water flow signal, when the water flow signal is greater than 2.5L/min, the water heater firstly turns on a fan to clean before, after a wind pressure switch detects to be closed, ignition is performed again, an air valve is turned on, combustion is performed again, and after water is turned off, the fan turns 20s to discharge waste gas in the water heater through a smoke tube.
Scene of starting ignition of water heater is triggered by mistake: when the water pressure of the user is large, the user can generate impact on a local waterway when the user turns on or turns off the water, and at the moment, the water heater can detect water flow signal pulses with different 1-5L/min, the maintenance time is less than 2s, and the water heater can start to ignite when detecting the water flow signals. At this time, when the user turns on or off the cold water, the water heater may be started to ignite.
The high floor low water pressure can not start the water heater or can not use the zero cold water function:
the gas water heater is different from the electric water heater, and the minimum load is larger, and when the flow is low, the water temperature which is hotter can be heated by the small minimum load. Therefore, the water flow rate is required to meet a certain value, which is generally 2.5L/MIN, so that the water heater can be started to heat, but part of water used on high floors or the zero cold water function can not reach the flow rate, so that the water heater cannot be used.
Disclosure of Invention
The invention aims to provide a control method for the minimum load matching starting flow of a gas water heater, which is used for intelligently judging whether the minimum load is the minimum firepower value of a machine design. The water flow signal, the water inlet temperature and the minimum load are collected, analyzed and judged, so that the normal hot water can be used for quickly starting ignition, the water heater can be prevented from being started by mistake due to the fact that cold water is switched on and off, and meanwhile, the water heater is started under low water pressure.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
according to one aspect of the invention, a control method for the minimum load matching start flow of a gas water heater is provided. The method comprises the following steps of according to a set temperature T Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 Comparing; if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 Comparing; if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 Heating; if T Effluent water <＝T Setting up Hold P Real world Heating is continued without change.
According to one embodiment of the invention, wherein, according to the set temperature T Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 The comparison includes: starting the gas water heater according to P= (T) Setting up -T Inflow of water )*Q/14，Calculating a demand load P; if the pump is of the type without water pump, P and P are directly connected 0 Comparing; if the water pump is of the water pump type, increasing water flow, recalculating the demand load P, and then combining P with P 0 A comparison is made.
According to one embodiment of the present invention, wherein, if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after ts operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 The comparison includes: p (P)<＝P 0 In accordance with the minimum theoretical load P 0 Running for 3s; according to P= (T Effluent water -T Inflow of water ) Calculating the actual load P by Q/14 Real world 。
According to one embodiment of the present invention, wherein, if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 The heating includes: if T Effluent water >T Setting up ，P Real world >P Real 0 Then P is taken Real world Gradually decrease to P Real 0 Heating; if T Effluent water >T Setting up ，P Real world <＝P Real 0 Then keep P Real 0 And (5) heating.
According to one embodiment of the present invention, wherein P Real 0 At 2.2kw, when P Real world >2.2kw, the proportional valve current is adjusted to P Real world Gradually reducing to 2.2kw; when P Real world <When=2.2 kw, heating was performed at 2.2kw.
According to one embodiment of the present invention, wherein, if T Effluent water <＝T Setting up Hold P Real world The constant continuous heating includes: when T is Effluent water Less than or equal to T Setting up When the water outlet temperature is approved to rise, the proportion current is slowly increased until T Effluent water >＝T Setting up 。
According to one embodiment of the invention, wherein, according to the set temperature T Setting up Temperature T of water inlet Inflow of water And a minimum theoretical load P 0 And adjusting the starting flow of the gas water heater.
According to an embodiment of the present invention, wherein,according to the set temperature T Setting up Temperature T of water inlet Inflow of water And a minimum theoretical load P 0 Adjusting the start-up flow of the gas water heater comprises: according to the minimum theoretical load P 0 And the detected flow rate determines a temperature rise value T Lifting device The method comprises the steps of carrying out a first treatment on the surface of the Calculating the required heating temperature DeltaT=T of the gas water heater Setting up -T Inflow of water The method comprises the steps of carrying out a first treatment on the surface of the At minimum theoretical load P 0 The flow rate required for heating delta T temperature is Q 0 ＝2*T Lifting device /(DeltaT); current flow rate Q When (when) >Q 0 At this time, the start flow rate Q may be set to Q 0 +0.5L/min。
According to one embodiment of the invention, the starting time is maintained according to the detected starting flow rate matching to prevent the gas water heater from being triggered by mistake to start ignition.
According to an embodiment of the present invention, wherein maintaining the start time to prevent false triggering of the gas water heater start-up ignition according to the detected start-up flow match comprises: detecting the starting flow Q and calculating the starting time T for preventing false triggering according to the starting flow Q Anti-theft device The method comprises the steps of carrying out a first treatment on the surface of the When the start flow Q < = 5L/MIN, the start time for preventing false triggering is T Anti-theft device = (5-Q)/5×2+0.3s; when the flow rate Q is started>At 5L/MIN, T Anti-theft device >0.3s。
One embodiment of the present invention has the following advantages or benefits:
the control method for the minimum load matching starting flow of the gas water heater intelligently judges whether the minimum load is the minimum firepower value of the machine design. The water flow signal, the water inlet temperature and the minimum load are collected, analyzed and judged, so that the normal hot water can be used for quickly starting ignition, the water heater can be prevented from being started by mistake due to the fact that cold water is switched on and off, and meanwhile, the water heater is started under low water pressure.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a flow chart illustrating a method of controlling a minimum load matching start-up flow of a gas water heater according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating a hot water flow signal versus time, according to an example embodiment.
FIG. 3 is a schematic diagram illustrating different sectional load sectional conditions of a 2-4-6 sectional water heater according to an exemplary embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.
Starting working principle of the gas water heater: when a user uses hot water, a water flow sensor in the gas water heater detects a water flow signal, and when the water flow signal is more than 2.5L/min and is maintained for 500ms, the water heater is cleaned before and ignition combustion is started.
Zero iceberg principle of operation: zero cold water function: under the condition of no boiled water, the zero cold water function is started, at the moment, a water pump in the water heater can be started, after the water pump is started, a hot water pipeline flows out, the water flows out through a water outlet pipe of the water heater, the water flows back to the water heater through a water return pipeline to form a circulating pipeline, after the water heater detects a water flow signal, combustion heating is started, the water in the whole circulating pipeline can be fully heated to a set temperature after 3-5 minutes, when a user takes a bath, hot water is provided for a shower, and cold water cannot flow out first, namely zero cold water.
Zero cold water start heating condition: after the water pump is operated, the water flow is required to be more than 2.5L/MIN to start heating. Because the user pipeline is longer, the flow limiting devices such as the adapter angle valve are more, and the water flow can not reach 2.5L/MIN, and the function can not be used.
Section load overlapping area description of the gas water heater:
the existing gas water heater is a constant temperature gas water heater, water heaters with different loads have different sectional modes, such as 2-4-6 sectional gas hot water, when the water heater burns, 2 rows (4 rows or 6 rows) of fire can be used for heating and burning, and different rows of fire numbers are selected for burning according to different loads, but when the water heater leaves a factory, 2 rows of maximum fire loads are required to be ensured to be larger than 4 rows of minimum fire loads, and 4 rows of maximum fire loads are required to be larger than 6 rows of minimum fire loads, so that load continuity is ensured.
The different sectional load sectional conditions (normal 2000pa inlet pressure) of the 2-4-6 sectional water heater are shown in fig. 3.
PL is the minimum opening of the small-section proportional valve, i.e., the minimum load, and the current controlling the proportional valve is about 120mA.
PH is the maximum opening degree of the sectional small proportional valve, namely the maximum load, and the current of the control proportional valve is about 180mA.
The opening degree of the proportional valves of different segments PL and PH are consistent. The number of combustion rows is controlled by solenoid valves.
2-4 overlap zone 2 PH-4pl=7-6=1 kW (23 kW is equivalent to 13L/min 25 degrees, 1kW means 14 degrees heatable at a water flow rate of 1L/min).
4-6 overlap region 4 PH-6pl=13-10=3 kW was calculated.
Table 1 is a comparison table of fan rotation speed values for standard smoke tubes
| Segmentation | PH rotation speed r/min | PL rotation speed value r/min |
| 2 | 2200 | 1800 |
| 4 | 2400 | 1900 |
| 6 | 3000 | 2000 |
Because of the large difference in gas pressure or heat value between the actual users, there is a possibility that the output will be different at the minimum load when the actual load is the same as the opening of the proportional valve, for example, when the minimum load becomes 4kw and 1000pa, and the minimum load becomes 2.2kw. For design, it is desirable that the minimum load does not stall at 1000pa pressure, stabilizing combustion. It is determined by the program that there will be a small load reduction for a normal user of 2000pa.
The relation between the starting flow and the minimum load of the water heater:
1. the prior art is general: the start flow is 2.5L/min, the maintenance time is more than 0.5s, and the shutdown flow is 2.0L/min.
2. Such as water heater minimum load: 3kw, the temperature can be increased by 20℃when heated at 2L/min under this load.
If the minimum load is reduced to 2.2kw, the temperature can be increased by 14 ℃ when heating at 2L/min under this load. The temperature can be reduced by 7 degrees compared to the previous temperature.
TABLE 2 minimum water flow rate 2L/min for different seasons Inlet Water temperature, outlet Water temperature and user demand control Table
TABLE 3 minimum water flow rate of 1.5L/min for different seasons Inlet Water temperature, outlet Water temperature and user demand control Table
As shown in fig. 1, fig. 1 shows a flow chart of a control method for the minimum load matching start flow of the gas water heater.
The control method of the minimum load matching starting flow of the gas water heater comprises the steps of calculating a required load P according to a set temperature Tset, a water inlet temperature Twater inlet and a starting flow Q and comparing the required load P with a preset minimum theoretical load P 0 Comparing; if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 Comparing; if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 Heating; if T Effluent water <＝T Setting up Hold P Real world Heating is continued without change.
The starting flow rate of the water heater is about 2.5L/MIIN, and when the flow rate of the water heater cannot be achieved by high-rise users and partial zero-cooling water pipeline structures, the gas water heater cannot be used. The flow is mainly related to the minimum load of the water heater, so that the starting flow value can be intelligently calculated through the minimum load and the inlet water temperature to replace the existing fixed value. The conventional minimum load of the gas water heater is 3kw, and the pressure value is 2000pa.
In a preferred embodiment of the invention, the temperature T is set according to Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 The comparison includes: starting the gas water heater according to P= (T) Setting up -T Inflow of water ) Q/14, calculating the demand load P; if the pump is of the type without water pump, P and P are directly connected 0 Comparing; if the water pump is of the water pump type, increasing water flow, recalculating the demand load P, and then combining P with P 0 A comparison is made.
As shown in fig. 1, after the gas water heater is started, the flow rate is stable. The user firstly sets the water temperature to be heated, namely T Setting up . The temperature sensor measures the inlet water temperature T Inflow of water . The flow sensor measures the inflow Q. And then calculating the current load by using a load calculation formula, and comparing the current load with the theoretical minimum load. If the model of the water pump is not provided, the water pump is directly heated, if the model of the water pump is provided, the water pump is opened to boost pressure, the water flow is increased, the load calculation is re-entered, and if the P is still at the minimum load, the heating is continued.
In a preferred embodiment of the invention, if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 The comparison includes: p (P)<＝P 0 In accordance with the minimum theoretical load P 0 Running for 3 seconds; according to P= (T Effluent water -T Inflow of water ) Calculating the actual load P by Q/14 Real world 。
As shown in fig. 1, the required load P and the minimum theoretical load P 0 After comparison, if P<＝P 0 Then according to the minimum theoretical load P 0 Heating for 3 seconds to calculate the actual load P Real world I.e. the current load.
In a preferred embodiment of the invention, if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 The heating includes: if T Effluent water >T Setting up ，P Real world >P Real 0 Then P is taken Real world Gradually decrease to P Real 0 Heating; if T Effluent water >T Setting up ，P Real world <＝P Real 0 Then keep P Real 0 And (5) heating.
As shown in FIG. 1, when the water outlet temperature is higher than the set temperature, the actual load P Real world And minimum actual load P Real 0 A comparison is made. If the actual load isA value greater than the minimum actual load indicates that there is still room for descent to continue to the minimum actual load. And heating according to the minimum actual load if the actual load is less than or equal to the minimum actual load.
In a preferred embodiment of the invention, P Real 0 At 2.2kw, when P Real world >2.2kw, the proportional valve current is adjusted to P Real world Gradually reducing to 2.2kw; when P Real world <When=2.2 kw, heating was performed at 2.2kw.
As shown in fig. 1, preferably, the minimum theoretical load P 0 Set to 3kw, the actual minimum load P Real 0 Set to 2.2kw. And comparing according to the relation between the actual load and the minimum actual load, and heating.
After the minimum load operation for 3s, the minimum load calculation was performed: p= (T Effluent water -T Inflow of water ) Q/14, when the water flow rate is 1L/min, which is represented by the 1kW, the water can be heated by 14 degrees), the water is reversely pushed, the water is compared with the theoretical minimum firepower of 1000pa and 2.2kW, and when the water outlet temperature exceeds the set temperature, the next step is carried out.
When the minimum load is greater than 2.2kw, it is considered that the external air pressure is possibly greater or the heat value is higher, the combustion firepower is greater than the theoretical value, how much proportional valve current should be reduced to 2.2kw (relationship between 2 rows of maximum firepower and current, the proportional valve current corresponding to 1kw is (PH-PL)/(P2 PH-P2 PL) = (180-120)/(7-3) =15 (mA)), the current should be reduced to 15 x (P-2.2) (mA), and in order to prevent flameout caused by sudden current drop, the wind speed 1800 is firstly reduced to 1700, the lowest rotation speed can be reduced to 1500, and the proportional valve current is reduced by 15 x (P-2.2) 50% after 1 s. Returning to 2.1 again for operation, slowly reducing for 3-4 times to approximately 2.2kw, if flameout occurs in the reducing process, restarting, and recording that the minimum control current of the proportional valve is the value before the last reduction.
When the minimum load < = 2.2kw, the minimum fire value is considered to be the minimum fire value, the current proportional valve current and the minimum load value are recorded, and the fan rotating speed is used for the next work.
In a preferred embodiment of the present invention,if T Effluent water <＝T Setting up Hold P Real world The constant continuous heating includes: when T is Effluent water Less than or equal to T Setting up When the water outlet temperature is approved to rise, the proportion current is slowly increased until T Effluent water >＝T Setting up 。
As shown in FIG. 1, the proportional current is slowly increased until T Effluent water >＝T Setting up When the current exceeds the default 120mA, the fan speed is restored to 1800.
In a preferred embodiment of the invention, the temperature T is set according to Setting up Temperature T of water inlet Inflow of water And a minimum theoretical load P 0 And adjusting the starting flow Q of the gas water heater. Wherein a temperature rise value Trise is determined from the minimum theoretical load P0 and the detected flow rate; calculating the required heating temperature DeltaT=T of the gas water heater Setting up -T Inflow of water The method comprises the steps of carrying out a first treatment on the surface of the The flow rate required to heat DeltaT at minimum theoretical load P0 is Q 0 = 2*T liters/Δt; current flow rate Q>Q 0 At this time, the start flow rate Q may be set to Q 0 +0.5L/min。
As shown in fig. 1, the theoretical minimum load of the water heater: 3kw, the temperature can be increased by 20℃when heated at 2L/min under this load.
Calculating the required heating temperature DeltaT=T of the water heater Setting up -T Inflow of water 。
At minimum load, the flow value Q at exactly heatable DeltaT temperature 0 ＝2*20/△T。
So when the flow rate Q>Q 0 When the heating load of the water heater is larger than the theoretical minimum load, the risk of overtemperature does not occur. So that the start flow of the water heater can be set to Q 0 +0.5 (L/min), shutdown flow is Q 0 。
Fig. 2 shows a schematic diagram of a hot water flow signal versus time according to the present invention.
In a preferred embodiment of the invention, the start time is maintained in accordance with a detected start flow match to prevent false triggering of the gas water heater to start ignition. Detecting the starting flow Q and calculating the starting time Tpreventing for preventing false triggering according to the starting flow Q; when openingWhen the dynamic flow Q < = 5L/MIN, the starting time for preventing false triggering is T Anti-theft device = (5-Q)/5×2+0.3s; when the flow rate Q is started>At 5L/MIN, T Anti-theft device >0.3s。
As shown in fig. 1 and 2, when the water pressure of the user is high, the user can generate impact on the local waterway when the user turns on or turns off the cold water, and at the moment, the water heater can detect the water flow signal pulse with the different 1-5L/min, the maintaining time is less than 2s, and the water heater can start to ignite due to the fact that the water heater detects the water flow signal. At this time, when the user turns on or off the cold water, the water heater may be started to ignite. When the cold water is switched on and off, the relation between the water flow signal and time is shown as follows. T (T) 1 <2S,T 1 About 2*T 0 . In the worst case, i.e. when the maximum value is 5L/min, T 1 When=2s, false triggering occurs if the water heater is started at 2.5L/MIN. The flow maintenance time in this state is shown in the following table T 0 ＝(5-Q)/5*2(Q<=5), the water heater needs to satisfy the maintaining time t while satisfying the start flow rate when starting the ignition>=t. When the flow < = 5L/MIN is detected, T= (5-Q)/5 x 2+0.3, and the critical value of false triggering is increased by 0.3s, so that false triggering is effectively prevented. When the detected flow rate is greater than 5L/MIN, T>0.3s。
The control method for the minimum load matching starting flow of the gas water heater intelligently judges whether the minimum load is the minimum firepower value of the machine design. The water flow signal, the water inlet temperature and the minimum load are collected, analyzed and judged, so that the normal hot water can be used for quickly starting ignition, the water heater can be prevented from being started by mistake due to the fact that cold water is switched on and off, and meanwhile, the water heater is started under low water pressure.
In embodiments of the present invention, the term "plurality" refers to two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally attached. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present invention.
In the description of the present specification, the terms "one embodiment," "a preferred embodiment," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention and is not intended to limit the embodiment of the present invention, and various modifications and variations can be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.
Claims (8)
1. The control method for the minimum load matching start flow of the gas water heater is characterized by comprising the following steps of:
according to the set temperature T Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 Comparing;
if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 Comparing;
if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 Heating；
If T Effluent water <＝T Setting up Hold P Real world Continuously heating without changing;
the method further comprises the steps of: according to the set temperature T Setting up Temperature T of water inlet Inflow of water And a minimum theoretical load P 0 Adjusting the starting flow Q of the gas water heater; the method specifically comprises the following steps: according to the minimum theoretical load P 0 And the detected flow rate determines a temperature rise value T Lifting device The method comprises the steps of carrying out a first treatment on the surface of the Calculating the required heating temperature DeltaT=T of the gas water heater Setting up -T Inflow of water The method comprises the steps of carrying out a first treatment on the surface of the At minimum theoretical load P 0 The flow rate required for heating delta T temperature is Q 0 ＝2*T Lifting device /(DeltaT); current flow rate Q When (when) >Q 0 At this time, the start flow rate Q may be set to Q 0 +0.5L/min。
2. The control method for the minimum load matching start-up flow rate of the gas water heater according to claim 1, wherein the control method is based on a set temperature T Setting up Temperature T of water inlet Inflow of water Calculating the demand load P by the start flow Q and comparing the demand load P with a preset minimum theoretical load P 0 The comparison includes:
starting the gas water heater according to P= (T) Setting up -T Inflow of water ) Q/14, calculating the demand load P;
if the pump is of the type without water pump, P and P are directly connected 0 Comparing;
if the water pump is of the water pump type, increasing water flow, recalculating the demand load P, and then combining P with P 0 A comparison is made.
3. The method for controlling a minimum load matching start-up flow rate of a gas water heater according to claim 1, wherein if P<＝P 0 In accordance with the minimum theoretical load P 0 Measuring the temperature T of the discharged water after T seconds of operation Effluent water And calculates the actual load P Real world And P is taken Real world And minimum actual load P Real 0 The comparison includes:
P<＝P 0 in accordance with the minimum theoretical load P 0 Running for 3 seconds;
according to P= (T Effluent water -T Inflow of water ) Calculating the actual load P by Q/14 Real world 。
4. The method for controlling a minimum load matching start-up flow rate of a gas water heater according to claim 3, wherein if T Effluent water >T Setting up Then P is taken Real world Gradually decrease to P Real 0 The heating includes:
if T Effluent water >T Setting up ，P Real world >P Real 0 Then P is taken Real world Gradually decrease to P Real 0 Heating;
if T Effluent water >T Setting up ，P Real world <＝P Real 0 Then keep P Real 0 And (5) heating.
5. The control method for minimum load matching start-up flow rate of gas water heater according to claim 4, wherein P Real 0 At 2.2kw, when P Real world >2.2kw, the proportional valve current is adjusted to P Real world Gradually reducing to 2.2kw; and
when P Real world <When=2.2 kw, heating was performed at 2.2kw.
6. The method for controlling a minimum load matching start-up flow rate of a gas water heater according to claim 5, wherein if T Effluent water <＝T Setting up Hold P Real world The constant continuous heating includes: when T is Effluent water Less than or equal to T Setting up When the water outlet temperature is approved to rise, the proportion current is slowly increased until T Effluent water >＝T Setting up 。
7. The method for controlling a minimum load matching start-up flow rate of a gas water heater according to claim 1, wherein the start-up time is maintained in accordance with the detected start-up flow rate matching to prevent a false triggering of the gas water heater to start up ignition.
8. The method for controlling a minimum load matching start-up flow rate of a gas water heater according to claim 7, wherein the step of matching the maintenance start-up time according to the detected start-up flow rate to prevent false triggering of the start-up ignition of the gas water heater comprises:
detecting the starting flow Q and calculating the starting time T for preventing false triggering according to the starting flow Q Anti-theft device ；
When the start flow Q < = 5L/MIN, the start time for preventing false triggering is T Anti-theft device ＝(5-Q)/5*2+0.3s；
When the flow rate Q is started>At 5L/MIN, T Anti-theft device >0.3s。
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